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smsc usb251xb/xbi revision 2.2 (02-17-12) datasheet datasheet product features general description the smsc usb251xb/xbi hub is a family of low-power, configurable, mtt (multi transaction translator) hub controller ic products for embedded usb solutions. the x in the part number indicates the number of downstream ports available, while the b indicates battery charging support. the smsc hub supports low- speed, full-speed, and hi-speed (if operating as a hi- speed hub) downstream devices on all of the enabled downstream ports. highlights ? high performance, low-power, small footprint hub controller ic with 2, 3, or 4 downstream ports ? fully compliant with the usb 2.0 specification [1] ? enhanced oem configuration options available through either a single serial i 2 c ? eeprom, or smbus slave port ? multitrak tm ? high-performance multiple transaction translator which provides one transaction translator per port ? portmap ? flexible port mapping and disable sequencing ? portswap ? programmable usb differential-pair pin locations ease pcb design by aligning usb signal lines directly to connectors ? phyboost ? programmable usb signal drive strength for recovering signal integrity using 4-level driving strength resolution features ? usb251xb/xbi products are fully footprint compatible with usb251x/xi/xa/xai products as direct drop-in replacements ? cost savings include using the same pcb components and application of usb-if compliance by similarity ? full power management with individual or ganged power control of each downstream port ? fully integrated usb termination and pull-up/pull- down resistors ? supports a single external 3.3 v supply source; internal regulators provide 1.2 v internal core voltage ? onboard 24 mhz crystal driver or external 24 mhz clock input ? customizable vendor id, product id, and device id ? 4 kilovolts of hbm jesd22-a114f esd protection (powered and unpowered) ? supports self- or bus-powered operation ? supports the usb battery charging specification rev. 1.1 for charging downstream ports (cdp) ? the usb251xb/xbi offers the following package: ? 36-pin qfn (6x6 mm) lead-free rohs compliant package ? usb251xbi products support the industrial temperature range of -40oc to +85oc ? usb251xb products support the extended commercial temperature range of 0oc to +85oc applications ? lcd monitors and tvs ? multi-function usb peripherals ? pc motherboards ? set-top boxes, dvd players, dvr/pvr ? printers and scanners ? pc media drive bay ? portable hub boxes ? mobile pc docking ? embedded systems usb251xb/xbi usb 2.0 hi-speed hub controller
order numbers: * add -tr to the end of any qfn order number to order tape and reel (36-pin packages only). reel size is 3,000 pieces. this product meets the halogen maximum concentration values per iec61249-2-21 for rohs compliance and environm ental information, please visit www.smsc.com/rohs please contact your smsc sales representative fo r additional documentation related to this product such as application notes, anomaly sheets, and design guidelines. order numbers * lead-free rohs compliant package package size (mm) temperature range usb2512b-aezg USB2513B-AEZC usb2514b-aezc 36-qfn 6x6x0.5 0oc to 85oc usb2512bi-aezg usb2513bi-aezg usb2514bi-aezg -40oc to 85oc usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 2 smsc usb251xb/xbi datasheet copyright ? 2012 smsc or its subsidiaries. all rights reserved. circuit diagrams and other information relating to smsc products are included as a means of illustrating typical applications. consequently, complete information sufficient for construction purposes is not necessarily given. although the information has been checked and is believed to be accurate, no re sponsibility is assumed for inaccuracies. smsc reserves the right to make changes to specifications and product descriptions at any time without notice. contact your local sm sc sales office to obtain the latest specifications before placing your product order. the provision of this information does not convey to the purchaser of the described semicond uctor devices any licenses under any patent rights or other intellectual property rights of smsc or others. all sales are expressly conditional on your agreement to the te rms and conditions of the most recently dated version of smsc's standard terms of sale agreement dated before the date of your order (the "terms of sale agreement"). the pro duct may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. anomaly sheets are availab le upon request. smsc products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. any and all such uses without prior written approval of an officer of smsc and further testing and/or modification will be fully at the risk of the customer. copies of this document or other smsc literature, as well as the terms of sale agreement, may be obtained by visiting smsc?s website at h ttp://www.smsc.com. smsc is a registered trademark of standard microsystems corporat ion (?smsc?). product names and company na mes are the trademarks of their respective holders. smsc disclaims and excludes any and all w arranties, including without li mitation any and all implied warranties of merchantabil ity, fitness for a particular purpose, title, and against infringement and the like, and any and all warranties arising from any cou rse of dealing or usage of trade. in no event shall smsc be liabl e for any direct, incidental, indi rect, special, punitive, or cons equential damages; or for lost data, profits, savings or revenues of any kind; regardless of the form of action, whether based on contrac t; tort; negligence of smsc or others; strict liability; breach of warranty; or otherwise; whether or not any remedy of buyer is h eld to have failed of its essential purpose, and whether or not smsc has been advised of the possibility of such damages.
conventions within this manual, the following abbreviations and symbols are used to improve readability. example description bit name of a single bit within a field field.bit name of a single bit (bit) in field x?y range from x to y, inclusive bits[m:n] groups of bits from m to n, inclusive pin pin name zzzzb binary number (value zzzz) 0xzzz hexadecimal number (value zzz) zzh hexadecimal number (value zz) rsvd reserved memory lo cation. must write 0, read value indeterminate code instruction code, or api function or parameter section name section or document name x don?t care <> indicate a parameter is optiona l or is only used under some conditions {,parameter} braces indicate paramete r(s) that repeat one or more times [parameter] brackets indicate a nested parameter. this parameter is not real and actually decodes into one or more real parameters. usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 3 revision 2.2 (02-17-12) datasheet
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 4 smsc usb251xb/xbi datasheet table of contents chapter 1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.1 configurable features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 chapter 2 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 chapter 3 pin information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 pin configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 pin list (alphabetical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.3 pin descriptions (grouped by function) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.3.1 configuring the strap pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4 buffer type descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 chapter 4 battery charging support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.1 usb battery charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.1.1 special behavior of prtpwr pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.2 battery charging configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.2.1 battery charging enabled via i 2 c eeprom or smbus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 chapter 5 initial interface/configuration options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.1 internal register set (common to i 2 c eeprom and smbus) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.1.1 register 00h: vendor id (lsb) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.1.2 register 01h: vendor id (msb) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.1.3 register 02h: product id (lsb) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.1.4 register 03h: product id (msb) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.1.5 register 04h: device id (lsb). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.1.6 register 05h: device id (msb) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.1.7 register 06h: config_byte_1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.1.8 register 07h: configuration data byte 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.1.9 register 08h: configuration data byte 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.1.10 register 09h: non-removable device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.1.11 register 0ah: port disable for self-powered operatio n. . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.1.12 register 0bh: port disable for bus-powered operatio n. . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.1.13 register 0ch: max power for se lf-powered operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.1.14 register 0dh: max power for bus-powered operatio n . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.1.15 register 0eh: hub controller max current for self-powered operation . . . . . . . . . . . . . . 34 5.1.16 register 0fh: hub controlle r max current for bus-powered operat ion . . . . . . . . . . . . . . 35 5.1.17 register 10h: power-on time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.1.18 register 11h: language id high . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.1.19 register 12h: language id low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.1.20 register 13h: manufacturer string length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.1.21 register 14h: product string length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5.1.22 register 15h: serial string length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5.1.23 register 16h-53h: manufacturer string . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5.1.24 register 54h-91h: product string . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5.1.25 register 92h-cfh: serial string. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5.1.26 register d0h: battery charging enable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5.1.27 register f6h: boost_up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5.1.28 register f8h: boost_4:0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 5 revision 2.2 (02-17-12) datasheet 5.1.29 register fah: port swap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 5.1.30 register fbh: portmap 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.1.31 register fch: portmap 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 5.1.32 register ffh: status/command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1 5.2 i 2 c eeprom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.2.1 i 2 c slave address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.2.2 protocol implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.2.3 pull-up resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.2.4 in-circuit eeprom programm ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.3 smbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.3.1 smbus slave address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.3.2 protocol implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.3.3 slave device timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5.3.4 stretching the sclk signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.3.5 smbus timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.3.6 bus reset sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.3.7 smbus alert response address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 5.4 default configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.5 reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.5.1 external hardware reset_n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.5.2 usb bus reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 chapter 6 dc parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 6.1 maximum guaranteed ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 6.2 operating conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 6.2.1 package thermal specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 chapter 7 ac specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 7.1 oscillator/crystal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 7.2 external clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 7.2.1 smbus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 7.2.2 i 2 c eeprom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 7.2.3 usb 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 chapter 8 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 8.1 tape and reel specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 appendix a (acronyms). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 appendix b (references) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 datasheet revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 6 smsc usb251xb/xbi datasheet list of figures figure 2.1 usb251xb/xbi hub family block dia gram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 3.1 2-port 36-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 3.2 3-port 36-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 3.3 4-port 36-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 3.4 non-removable pin strap example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 figure 3.5 pin strap option with ipd pin example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 3.6 led pin strap example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 4.1 battery charging via external powe r supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 5.1 block write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 figure 5.2 block read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 figure 5.3 reset_n timing for default configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5 figure 5.4 reset_n timing for eeprom mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 figure 5.5 reset_n timing for smbus mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 figure 6.1 supply rise time model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 figure 7.1 typical crystal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 figure 7.2 formula to find the value of c1 and c2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6 figure 8.1 36-pin qfn, 6x6 mm body, 0.5 mm pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 figure 8.2 36-pin package tape specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 figure 8.3 36-pin package reel specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 7 revision 2.2 (02-17-12) datasheet list of tables table 1.1 summary of compatibilitie s between usb251xb/xbi and usb251x /xi/xa/xai products . . . . 9 table 3.1 usb251xb/xbi pin list (alphabetical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 3.2 usb251xb/xbi pin list (alphabetical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 3.3 usb251xb/xbi pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 3.4 strap option summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 3.5 buffer type descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 5.1 initial interface/config uration options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 6.1 dc electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 table 6.2 supply current unconfigured: hi-speed host (i ccinths ) . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 table 6.3 supply current unconfigured: full-speed host (i ccintfs ). . . . . . . . . . . . . . . . . . . . . . . . . . 52 table 6.4 supply current configured: hi-speed host (i hch1 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 table 6.5 supply current configured: full-speed host (i fcc1 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 table 6.6 supply current suspend (i csby ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 table 6.7 supply current reset (i crst ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 table 6.8 pin capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 table 6.9 package thermal resistance parame ters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 table 6.10 package thermal resistance para meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 table 6.11 legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 table 7.1 crystal circuit legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 customer revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 8 smsc usb251xb/xbi datasheet chapter 1 overview the smsc usb251xb/xbi hub family is a group of low-power, configurable, mtt (multi transaction translator) hub controller ics. the hub provides downstream ports for embedded usb solutions and is fully compliant with the usb 2.0 specification [1] . each of the smsc hub controllers can attach to an upstream port as a full-speed or full-/hi-speed hub. the hub can support low-speed, full-speed, and hi-speed downstream devices when operating as a hi-speed hub. all required resistors on the usb ports are integrated into the hub. this includes all series termination resistors and all required pull-down and pull-up resi stors on d+ and d- pins. the over-current sense inputs for the downstream facing ports have internal pull-up resistors. the usb251xb/xbi hub family includes programmable features, such as: ? multitrak tm technology : implements a dedicated transaction translator (tt) for each port. dedicated tts help maintain consistent full-spe ed data throughput regardless of the number of active downstream connections. ? portmap : provides flexible port mapping and dis able sequences. the downstream ports of a usb251xb/xbi hub can be reordered or disabled in any sequence to support multiple platform designs with minimum effort. for any port that is disabled, the usb251xb/xbi hub controller automatically reorders the remaining ports to match the usb host controller?s port numbering scheme. ? portswap : allows direct alignment of usb signals (d+/d-) to connectors to avoid uneven trace length or crossing of the usb differential signals on the pcb. ? phyboost : enables 4 programmable levels of usb si gnal drive strength in downstream port transceivers. phyboost will also attempt to restore usb signal integrity. 1.1 configurable features the smsc usb251xb/xbi hub controller provides a default configuration that may be sufficient for most applications. strapping option pins (see section 3.3.1 on page 22 ) provide additional features to enhance the default configuration. when the hub is init ialized in the default configuration, the following features may be configured using the strapping options: ? downstream non-removable ports, where the hub will automatically report as a compound device ? downstream disabled ports ? enabling of battery charging option on individual ports the usb251xb/xbi hub controllers can alternatively be configured by an external i 2 c eeprom or a microcontroller as an smbus slave devi ce. when the hub is configured by an i 2 c eeprom or over smbus, the following configur able features are provided: ? support for compound devices on a port-by-port basis ? selectable over-current sensing and port power c ontrol on an individual or ganged basis to match the circuit board component selection ? customizable vendor id, product id, and device id ? configurable usb signal drive strength ? configurable usb differential pair pin location ? configurable delay time for filter ing the over-current sense inputs ? configurable downstream port powe r-on time reported to the host ? indication of the maximum cu rrent that the hub consumes from the usb upstream port
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 9 revision 2.2 (02-17-12) datasheet ? indication of the maximum current required for the hub controller ? custom string descriptors (up to 31 characters): product manufacturer serial number ? battery charging usb251xb/xbi products are fully footprint compatible with usb251x/xi/xa/xai products: pin-compatible direct drop-in replacement use the same pcb components usb-if compliance by similarity for ease of use and a complete cost reduction solution product ids, device ids, and other register defaults may differ. see section 5.1 on page 27 for details. table 1.1 summary of compatibilities between usb251xb/xbi and usb251x/xi/xa/xai products part number drop-in replacement usb2512 usb2512b usb2512i usb2512bi usb2512a usb2512b usb2512ai usb2512bi usb2513 usb2513b usb2513i usb2513bi usb2514 usb2514b usb2514i usb2514bi
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 10 smsc usb251xb/xbi datasheet chapter 2 block diagram figure 2.1 usb251xb/xbi hub family block diagram 3.3 v upstream phy repeater controller sck sda phy#1 3.3 v pll vdda vddcr serial interface engine serial interface port controller port power usb data downstream port power oc sense switch/ led drivers usb data downstream routing and port re-ordering logic 1.2 v reg bus- power detect/ v bus pulse 1.2 v reg 24 mhz crystal upstream usb data to upstream v bus to i 2 c eeprom or smbus master phy# x port # x oc sense switch driver/ led drivers tt # x tt #1 ... port #1 oc sense switch driver/ led drivers oc sense switch/ led drivers ... x indicates the number of available downstream ports: 2, 3, or 4
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 11 revision 2.2 (02-17-12) datasheet chapter 3 pin information this chapter outlines the pinning configurations for each package type available, followed by a corresponding pin list organized alphabetically. the detailed pin descriptions are listed then outlined by function in section 3.3: pin descriptions (grouped by function) on page 19 . 3.1 pin configurations the following figures detail the pinouts of the various usb251xb/xbi versions. figure 3.1 2-port 36-pin qfn ground pad (must be connected to vss) smsc usb2512b/12bi (top view qfn-36) 26 vdd33 25 reset_n 24 hs_ind/cfg_sel1 23 scl/smbclk/cfg_sel0 22 sda/smbdata/non_rem1 21 nc 20 nc 19 vbus_det 27 nc 18 nc 17 16 15 14 vdd33 13 crfilt 12 11 test 10 vdda33 ocs_n2 prtpwr2/bc_en2 ocs_n1 prtpwr1/bc_en1 28 vdda33 29 usbdp_up 31 xtalout 32 33 rbias 36 vdd33 35 pllfilt 34 usbdm_up 30 xtalin/clkin susp_ind/local_pwr/non_rem0 vdda33 1 2 3 4 5 nc 6 nc 7 nc 8 nc 9 usbdm_dn1 usbdp_dn1 usbdm_dn2 usbdp_dn2 indicates pins on the bottom of the device.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 12 smsc usb251xb/xbi datasheet figure 3.2 3-port 36-pin qfn ground pad (must be connected to vss) smsc usb2513b/13bi (top view qfn-36) 26 vdd33 25 reset_n 24 hs_ind/cfg_sel1 23 scl/smbclk/cfg_sel0 22 sda/smbdata/non_rem1 21 nc 20 nc 19 vbus_det 27 ocs_n3 18 17 16 15 14 13 12 11 10 vdda33 test prtpwr1/bc_en1 ocs_n1 crfilt vdd33 prtpwr2/bc_en2 ocs_n2 prtpwr3/bc_en3 28 29 31 32 33 36 35 34 30 vdd33 rbias pllfilt xtalin/clkin xtalout usbdp_up usbdm_up vdda33 susp_ind/local_pwr/non_rem0 1 2 3 4 5 6 7 8 9 usbdm_dn1/prt_dis_m1 usbdp_dn1/prt_dis_p1 usbdm_dn2/prt_dis_m2 usbdp_dn2/prt_dis_p2 vdda33 usbdm_dn3/prt_dis_m3 nc nc usbdp_dn3/prt_dis_p3 indicates pins on the bottom of the device.
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 13 revision 2.2 (02-17-12) datasheet figure 3.3 4-port 36-pin qfn ground pad (must be connected to vss) smsc usb2514b/14bi (top view qfn-36) 26 vdd33 25 reset_n 24 hs_ind/cfg_sel1 23 scl/smbclk/cfg_sel0 22 sda/smbdata/non_rem1 21 ocs_n4 20 prtpwr4/bc_en4 19 vbus_det 27 ocs_n3 18 17 16 15 14 13 12 11 10 vdda33 test prtpwr1/bc_en1 ocs_n1 crfilt vdd33 prtpwr2/bc_en2 ocs_n2 prtpwr3/bc_en3 28 29 31 32 33 36 35 34 30 vdd33 rbias pllfilt xtalin/clkin xtalout usbdp_up usbdm_up vdda33 susp_ind/local_pwr/non_rem0 1 2 3 4 5 6 7 8 9 usbdm_dn1/prt_dis_m1 usbdp_dn1/prt_dis_p1 usbdm_dn2/prt_dis_m2 usbdp_dn2/prt_dis_p2 vdda33 usbdm_dn3/prt_dos_m3 usbdp_dn3/prt_dis_p3 usbdm_dn4/prt_dis_m4 usbdp_dn4/prt_dis_p4 indicates pins on the bottom of the device.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 14 smsc usb251xb/xbi datasheet 3.2 pin list (alphabetical) table 3.1 usb251xb/xbi pin list (alphabetical) symbol name pin numbers 36 qfn usb2512b usb2512bi usb2513b usb2513bi usb2514b usb2514bi bc_en1 battery charging strap option 12 bc_en2 16 bc_en3 -18 bc_en4 -20 cfg_sel0 configuration programming selection 24 cfg_sel1 25 clkin external clock input 33 crfilt core regulator filter capacitor 14 ground pad exposed pad tied to ground (vss) epad hs_ind hi-speed upstream port indicator 25 local_pwr local power detection 28 nc no connect 6 - nc 7- nc 18 - nc 19 - nc 8- nc 9- nc 20 - nc 21 - non_rem0 non-removable port strap option 28 non_rem1 22 ocs_n1 over-current sense 13 ocs_n2 17 ocs_n3 -19 ocs_n4 -21 pllfilt pll regulator filter capacitor 34
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 15 revision 2.2 (02-17-12) datasheet prt_dis_m1 downstream port disable strap option -1 prt_dis_m2 3 prt_dis_m3 -6 prt_dis_m4 -8 prt_dis_p1 port disable - 2 prt_dis_p2 4 prt_dis_p3 -7 prt_dis_p4 -9 prtpwr1 usb port power enable 12 prtpwr2 16 prtpwr3 -18 prtpwr4 -20 rbias usb transceiver bias 35 reset_n reset input 26 scl serial clock 24 sda serial data signal 22 smbclk system management bus clock 24 smbdata server message block data signal 22 susp_ind active/suspend status indicator 28 test test pin 11 usbdm_up usb bus data 30 usbdp_up 31 usbdm_dn1 hi-speed usb data 1 usbdm_dn2 3 usbdm_dn3 -6 usbdm_dn4 -8 usbdp_dn1 2 usbdp_dn2 4 usbdp_dn3 -7 usbdp_dn4 -9 table 3.1 usb251xb/xbi pin li st (alphabetica l) (continued) symbol name pin numbers 36 qfn usb2512b usb2512bi usb2513b usb2513bi usb2514b usb2514bi
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 16 smsc usb251xb/xbi datasheet vbus_det upstream vbus power detection 27 vdd33 3.3 v power 5 vdd33 10 vdd33 15 vdd33 23 vdd33 29 vdd33 36 xtalin crystal input 33 xtalout crystal output 32 table 3.2 usb251xb/xbi pin list (alphabetical) symbol name pin numbers 36 qfn usb2512b usb2512bi usb2513b usb2513bi usb2514b usb2514bi bc_en1 battery charging strap option 12 bc_en2 16 bc_en3 -18 bc_en4 -20 cfg_sel0 configuration programming selection 24 cfg_sel1 25 clkin external clock input 33 crfilt core regulator filter capacitor 14 ground pad (vss) exposed pad tied to ground (vss) epad hs_ind hi-speed upstream port indicator 25 local_pwr local power detection 28 table 3.1 usb251xb/xbi pin li st (alphabetica l) (continued) symbol name pin numbers 36 qfn usb2512b usb2512bi usb2513b usb2513bi usb2514b usb2514bi
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 17 revision 2.2 (02-17-12) datasheet nc no connect 6 - nc 7- nc 18 - nc 19 - nc 8- nc 9- nc 20 - nc 21 - non_rem0 non-removable port strap option 28 non_rem1 22 ocs_n1 over-current sense 13 ocs_n2 17 ocs_n3 -19 ocs_n4 -21 pllfilt pll regulator filter capacitor 34 prt_dis_m1 downstream port disable strap option -1 prt_dis_m2 3 prt_dis_m3 -6 prt_dis_m4 -8 prt_dis_p1 port disable - 2 prt_dis_p2 4 prt_dis_p3 -7 prt_dis_p4 -9 prtpwr1 usb port power enable 12 prtpwr2 16 prtpwr3 -18 prtpwr4 -20 rbias usb transceiver bias 35 reset_n reset input 26 scl serial clock 24 sda serial data signal 22 table 3.2 usb251xb/xbi pin li st (alphabetica l) (continued) symbol name pin numbers 36 qfn usb2512b usb2512bi usb2513b usb2513bi usb2514b usb2514bi
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 18 smsc usb251xb/xbi datasheet smbclk system management bus clock 24 smbdata server message block data signal 22 susp_ind active/suspend status indicator 28 test test pin 11 usbdm_up usb bus data 30 usbdp_up 31 usbdm_dn1 hi-speed usb data 1 usbdm_dn2 3 usbdm_dn3 -6 usbdm_dn4 -8 usbdp_dn1 2 usbdp_dn2 4 usbdp_dn3 -7 usbdp_dn4 -9 vbus_det upstream vbus power detection 27 vdd33 3.3 v digital power 15 vdd33 23 vdd33 36 vdda33 3.3 v analog power 5 vdda33 10 vdda33 29 vdda33 - xtalin crystal input 33 xtalout crystal output 32 table 3.2 usb251xb/xbi pin li st (alphabetica l) (continued) symbol name pin numbers 36 qfn usb2512b usb2512bi usb2513b usb2513bi usb2514b usb2514bi
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 19 revision 2.2 (02-17-12) datasheet 3.3 pin descriptions (grouped by function) an n at the end of a signal name indicates that the active (asserted) state occurs when the signal is at a low voltage level. when the n is not present, the signal is asserted when it is at a high voltage level. the terms assertion and negation are used exclusively in order to avoid confusion when working with a mixture of active low and active high signals . the term assert, or asse rtion, indicates that a signal is active, independent of whether that level is represented by a high or low voltage. the term negate, or negation, indicates that a signal is inactive. table 3.3 usb251xb/xbi pin descriptions symbol buffer type description upstream usb 2.0 interfaces usbdm_up usbdp_up io-u usb data: connect to the upstream usb bus data signals (host, port, or upstream hub). vbus_det i detect upstream vbus power: detects the state of the upstream vbus power. the smsc hub monitors vbus_det to determine when to assert the internal d+ pull-up resistor: (signaling a connect event). when designing a detachable hub, this pin should be connected to vbus on the upstream port via a 2:1 voltage divider. two 100 k resistors are suggested. for self-powered applications with a permanently attached host, this pin must be connected to a dedicated host control output, or connected to the 3.3 v domain that powers the host (typically vdd33 ). downstream usb 2.0 interfaces usbdp_dn[x:1]/ prt_dis_p[x:1] io-u hi-speed usb data: connect to the downstream usb peripheral devices attached to the hub?s port. to disable, use a 10 k pull-up resistor to 3.3 v. usbdm_dn[x:1]/ prt_dis_m[x:1] downstream port disable strap option: when enabled by package and configuration settings (see table 5.1 on page 26 ), this pin is sampled at reset_n negation to determine if the port is disabled. to disable a port, pull up both prt_dis_m[x:1] and prt_dis_p[x:1] pins for the corresponding port number(s). see section 3.3.1, on page 22 for pull up details. prtpwr[x:1]/ o12 usb power enable: enables power to usb peripheral devices downstream. bc_en[x:1] ipd battery charging strap option: when enabled by package and configuration settings (see table 5.1 ), the pin will be sampled at reset_n negation to determine if ports [x:1] support the battery charging protocol. when supporting the battery charging protocol, the hub also supports external port power controllers. the battery charging protocol enables a device to draw the currents per the usb battery charging specification. see section 3.3.1, on page 22 for strap pin details. 1 : battery charging feature is supported for port x 0 : battery charging featur e is not supported for port x ocs_n[x:1] ipu over-current sense: input from external current monitor indicating an over- current condition. rbias i-r usb transceiver bias: a 12.0 k (+/- 1%) resistor is attached from ground to this pin to set the transceiver?s internal bias settings.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 20 smsc usb251xb/xbi datasheet serial port interfaces sda/ i/osd12 serial data signal smbdata/ system management bus signal non_rem1 non-removable port 1 strap option: when enabled by package and configuration options (see table 5.1 on page 26 ), this pin will be sampled (in conjunction with local_pwr/susp_ind/non_rem0 ) at reset_n negation to determine if ports [x:1] contain permanently attached (non-removable) devices: non_rem[1:0] = 00 : all ports are removable non_rem[1:0] = 01 : port 1 is non-removable non_rem[1:0] = 10 : ports 1 and 2 are non-removable non_rem[1:0] = 11 : when available, ports 1, 2, and 3 are non-removable when non_rem[1:0] is chosen such that there is a non-removable device, the hub will automatically report itself as a compound device (using the proper descriptors). reset_n is reset input: the system can reset the chip by driving this input low. the minimum active low pulse is 1 s. scl/ i/osd12 serial clock (scl) smbclk/ system management bus clock cfg_sel0 configuration select: the logic state of th is multifunction pin is internally latched on the rising edge of reset_n ( reset_n negation), and will determine the hub configuration method as described in ta b l e 5 . 1 . hs_ind/ i/o12 hi-speed upstream port indicator: upstream port connection speed. asserted = the hub is connected at hs negated = the hub is connected at fs note: when implementing an external led on this pin, the active state is indicated above and outlined in section 3.3.1.3, on page 23 . cfg_sel1 configuration programming select 1: the logic state of this pin is internally latched on the rising edge of reset_n ( reset_n negation), and will determine the hub configuration method as described in ta b l e 5 . 1 . misc xtalin iclkx crystal input: 24 mhz crystal. this pin connects to either one terminal of the crystal or to an external 24 mhz clock when a crystal is not used. clkin external clock input: this pin connects to either one terminal of the crystal or to an external 24 mhz clock when a crystal is not used. xtalout oclkx crystal output: this is the other terminal of the crystal circuit with 1.2 v p-p output and a weak (< 1ma) driving strength. when an external clock source is used to drive xtalin/clkin , leave this pin unconnected, or use with appropriate caution. table 3.3 usb251xb/xbi pin descriptions (continued) symbol buffer type description
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 21 revision 2.2 (02-17-12) datasheet susp_ind/ i/o active/suspend status led: indicates usb state of the hub. negated = unconfigured; or co nfigured and in usb suspend asserted = hub is configured and is active (i.e., not in suspend) local_pwr/ local power: detects availability of local self-power source. low = self/local power source is not ava ilable (i.e., the hub gets all power from the upstream usb vbus) high = self/local power source is available non_rem0 non-removable 0 strap option: when enabled by package and configuration settings (see table 5.1 on page 26 ), this pin will be sampled (in conjunction with non_rem[1] ) at reset_n negation to determine if ports [x:1] contain permanently attached (non-removable) devices: note: when implementing an external led on this pin, the active state is outlined below and detailed in section 3.3.1.3, on page 23 . non_rem[1:0] = 00 : all ports are removable; led is active high non_rem[1:0] = 01 : port 1 is non-removable; led is active low non_rem[1:0] = 10 : ports 1 and 2 are non-removable; led is active high non_rem[1:0] = 11 : (when available) ports 1, 2, and 3 are non-removable; led is active low test ipd test pin: treat as a no connect pin or connect to ground. no trace or signal should be routed or attached to this pin. power, ground, and no connects crfilt vdd core regulator filter capacitor: this pin can have up to a 0.1 f low-esr capacitor to vss, or be left unconnected. vdd33 3.3 v power pllfilt pll regulator filter capacitor: this pin can have up to a 0.1 f low-esr capacitor to vss, or be left unconnected. vss ground pad/epad: the package slug is the only vss for the device and must be tied to ground with multiple vias. nc no connect: no signal or trace should be routed or attached to all nc pins. table 3.3 usb251xb/xbi pin descriptions (continued) symbol buffer type description
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 22 smsc usb251xb/xbi datasheet 3.3.1 configuring the strap pins if a pin's strap function is enabled thru the hub configuration selection, ( table 5.1: initial interface/configuration options on page 26 ) the strap pins must be pulle d either high or low using the values provided in ta b l e 3 . 4 . each strap option is dependent on the pin?s buffer type, as outlined in the sections that follow. 3.3.1.1 non-removable if a strap pin?s buffer type is i/o, an external pull-up or pull-down must be implemented as shown in figure 3.4 . use strap high to set the strap option to 1 and stap low to set the strap option to 0. when implementing the strap low option, no additional components are needed (i.e., the internal pull-down provides the resistor) figure 3.4 non-removable pin strap example 3.3.1.2 internal pull-down (ipd) if a strap pin?s buffer type is ipd (pins bc_en[x:1] ), one of the two hardware configurations outlined below must be implemented. use t he strap high configuration to set the strap option value to 1 and strap low to set the strap option value to 0. figure 3.5 pin strap option with ipd pin example table 3.4 strap option summary strap option resistor value buffer type notes non-removable 47 - 100 k i/o internal pull-down 10 k ipd ? only applicable to port power pins ? contains a built-in resistor led 47 - 100 k i/o hub hub i/o strap pin strap high +v i/o strap pin strap low gnd r k r k +v vss ipd strap pin strap low vss
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 23 revision 2.2 (02-17-12) datasheet 3.3.1.3 led if a strap pin?s buffer type is i/o and shares func tionality with an led, the hardware configuration outlined below must be implemented. the internal lo gic will drive the led appropriately (active high or low) depending on the sampled strap option. use th e strap high configuration to set the strap option value to 1 and strap low to set the strap option to 0. figure 3.6 led pin strap example 3.4 buffer type descriptions table 3.5 buffer type descriptions buffer type description i input i/o input/output ipd input with internal weak pull-down resistor ipu input with internal weak pull-up resistor is input with schmitt trigger o12 output 12 ma i/o12 input/output buffer with 12 ma sink and 12 ma source i/osd12 open drain with schmitt trigger and 12 ma sink. meets the i 2 c-bus specification [2] requirements. iclkx xtal clock input oclkx xtal clock output i-r rbias i/o-u analog input/output de fined in usb specification hub hub strap pin led/ strap high strap pin led/ strap low r k r k +v
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 24 smsc usb251xb/xbi datasheet chapter 4 battery charging support the usb251xb/xbi smsc hub provides support for battery charging devices on a per port basis in compliance with the usb battery charging specification, revision 1.1 . the hub can be configured to individually enable each downstream port for batter y charging support either via pin strapping as illustrated in figure 4.1 or by setting the corresponding configuration bits via i 2 c eeprom or smbus ( section 5.1 on page 27 ). figure 4.1 battery charging via external power supply note: r strap enables battery charging. 4.1 usb battery charging a downstream port enabled for battery charging turns on port power as soon as the power on reset and hardware configuration process has comple ted. the hub does not need to be enumerated nor does vbus_det need to be asserted for the port power to be enabled. these conditions allow battery charging in s3, s4, and s5 system power states as well as in the fully operat ional state. the usb battery charging specification does not interfere with standard us b operation, which allows a device to perform battery charging at any time. a port that supports battery charging must be able to support 1.5 amps of current on vbus. standard usb port power controllers typically only allow for 0. 8 amps of current before detecting an over-current condition. therefore, the 5 volt power supply, port power controller, or over-current protection devices must be chosen to handle the larger current demand compared to standard usb hub designs. 4.1.1 special behavi or of prtpwr pins the usb251xb/xbi enables vbus by asserting the port power ( prtpwr ) as soon as the hardware configuration process has completed. if the port detects an over-current condition, prtpwr will be turned off to protect the circuitry from overloading. if an over-current condition is detected when the hub is not enumerated, prtpwr can only be turned on from the host or if reset_n is toggled. these usb251xb/xbi usb port power controller in en flag vbus 5.0 v 3.3 v r strap prtpwr[x:1] ocs_n[x]
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 25 revision 2.2 (02-17-12) datasheet behaviors provide battery charging even when the hub is not enumerated and protect the hub from sustained short circuit conditions. if the short circ uit condition persists when the hub is plugged into a host system the user is notifi ed that a port has an over-cur rent conditi on. otherwise prtpwr turned on by the host system and t he ports operate normally. 4.2 battery charging configuration the battery charging option can be configured in one of two ways: ? when the hub is brought up in the default configuration with strapping options enabled, with the prtpwr[x:1]/bc_en[x:1] pins configured. see the following sections for details: ? section 3.3: pin descriptions (grouped by function) on page 19 ? section 3.3.1.2: internal pull-down (ipd) on page 22 ? when the hub is initialized for configuration over i 2 c eeprom or smbus. either of these interfaces can be used to configure the battery charging option. 4.2.1 battery charging enabled via i 2 c eeprom or smbus register memory map location 0xd0 is allocated for battery charging support. the battery charging register at location 0xd0 starting from bit 1 enab les battery charging for each downstream port when asserted. bit 1 represents port 1, bit 2 represents port 2, etc. each port with battery charging enabled asserts the corresponding prtpwr[x:1] pin.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 26 smsc usb251xb/xbi datasheet chapter 5 initial interface/configuration options the hub must be configured in order to correctly function when attached to a usb host controller. the hub can be configured either internally or externally by setting the cfg_sel[1:0] pins (immediately after reset_n negation) as outlined in the table below. note: see chapter 11 (hub specification) of the usb specification for general details regarding hub operation and functionality. to configure the hub externally, there are two prin cipal ways to interface to the hub: over smbus or i 2 c eeprom. the hub can be co nfigured internally, where several de fault configurations are available as described in the table below. when configured inte rnally, additional configuration is available using the strap options (listed in section 3.3.1 on page 22 ). note: strap options are not available when configuring the hub over i 2 c or smbus. table 5.1 initial interface/configuration options cfg_sel[1] cfg_sel[0] description 0 0 default configuration: ? strap options enabled ? self-powered operation enabled ? individual power switching ? individual over-current sensing 0 1 the hub is configured externally over smbus (as an smbus slave device): ? strap options disabled ? all registers configured over smbus 1 0 default configuration with the following overrides: ? bus-powered operation 1 1 the hub is configured over 2-wire i 2 c eeprom: ? strap options disabled ? all registers configured by i 2 c eeprom
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 27 revision 2.2 (02-17-12) datasheet 5.1 internal register set (common to i 2 c eeprom and smbus) the register set available when configuring the hub to interface over i 2 c or smbus is outlined in the table below. each register has r/w capability, where eeprom reset val ues are 0x00. reserved registers should be written to 0 unless otherwise sp ecified. contents read from unavailable registers should be ignored. address register name default rom values (hexidecimal) usb2512b/12bi usb2513b/13bi usb2514b/14bi 00h vendor id lsb 24 01h vendor id msb 04 02h product id lsb 12 13 14 03h product id msb 25 04h device id lsb b3 05h device id msb 0b 06h configuration data byte 1 9b 07h configuration data byte 2 20 08h configuration data byte 3 02 09h non-removable devices 00 0ah port disable (self) 00 0bh port disable (bus) 00 0ch max power (self) 01 0dh max power (bus) 32 0eh hub controller max current (self) 01 0fh hub controller max current (bus) 32 10h power-on time 32 11h language id high 00 12h language id low 00 13h manufacturer string length 00 14h product string length 00 15h serial string length 00 16h-53h manufacturer string 00
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 28 smsc usb251xb/xbi datasheet 5.1.1 register 00h: vendor id (lsb) 5.1.2 register 01h: vendor id (msb) 54h-91h product string 00 92h-cfh serial string 00 d0h battery charging enable 00 e0h rsvd 00 f5h rsvd 00 f6h boost_up 00 f7h rsvd 00 f8h boost_x:0 00 f9h rsvd 00 fah port swap 00 fbh port map 12 00 fch port map 34 - 00 fd-feh rsvd 00 ffh status/command note: smbus register only 00 bit number bit name description 7:0 vid_lsb least significant byte of the vendor id: a 16-bit value that uniquely identifies the vendor of the user device (assigned by usb-interface forum). set this field using either the smbus or i 2 c eeprom interface options. bit number bit name description 7:0 vid_msb most significant byte of the vendor id: a 16-bit value that uniquely identifies the vendor of the user device (assig ned by usb-interface forum). set this field using either the smbus or i 2 c eeprom interface options. address register name default rom values (hexidecimal) usb2512b/12bi usb2513b/13bi usb2514b/14bi
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 29 revision 2.2 (02-17-12) datasheet 5.1.3 register 02h: product id (lsb) 5.1.4 register 03h: product id (msb) 5.1.5 register 04h: device id (lsb) 5.1.6 register 05h: device id (msb) bit number bit name description 7:0 pid_lsb least significant byte of the produc t id: a 16-bit value that uniquely identifies the product id of the user device. set this field using either the smbus or i 2 c eeprom interface options. bit number bit name description 7:0 pid_msb most significant byte of the product id: a 16-bit value that uniquely identifies the product id of the user device. set this field using either the smbus or i 2 c eeprom interface options. bit number bit name description 7:0 did_lsb least significant byte of the device id: a 16-bit device release number in bcd format (assigned by oem). set this field using either the smbus or i 2 c eeprom interface options. bit number bit name description 7:0 did_msb most significant byte of the device id: a 16-bit device release number in bcd format (assigned by oem). set this field using either the smbus or i 2 c eeprom interface options.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 30 smsc usb251xb/xbi datasheet 5.1.7 register 06h: config_byte_1 bit number bit name description 7 self_bus_pwr self or bus power: selects between self- and bus-powered operation. the hub is either self-powered (draws less than 2 ma of upstream bus power) or bus-powered (limited to a 100 ma maximum of upstream power prior to being configured by the host controller). when configured as a bus-powered devic e, the smsc hub consumes less than 100 ma of current prior to being configured. after configuration, the bus- powered smsc hub, along with all associated hub circuitry, any embedded devices (if part of a compound device), and all externally available downstream ports (max 100 ma) must consume no more than 500 ma of upstream vbus current. the current consumption is syst em dependent and must not violate the usb 2.0 specification [1] . when configured as a self-powered device, < 1 ma of upstream vbus current is consumed and all ports are available. each port is capable of sourcing 500 ma of current. this field is set over either the smbus or i 2 c eeprom interface options. 0 : bus-powered operation 1 : self-powered operation if dynamic power switching is enabled ( section 5.1.8 ), this bit is ignored and local_pwr is used to determine if the hub is operating from self or bus power. 6 rsvd 5 hs_disable hi-speed disable: dis ables the capability to attach as either a hi- or full- speed device, forcing full-speed attachme nt only (i.e., no hi-speed support). 0 : hi-/full-speed 1 : full-speed only (hi-speed disabled) 4 mtt_enable multi-tt enable: enables one tr ansaction translator per port operation. selects between a mode where only one transaction translator is available for all ports (single-tt), or each port gets a dedicated transaction translator (multi-tt). 0 : single tt for all ports 1 : multi-tt (one tt per port) 3 eop_disable eop disable: disables end of packet (eop) generation at end of frame time #1 (eof1) when in full-speed mode. during full-speed operation only, the hub can send eop when no downstream traffic is detected at eof1. see the usb 2.0 specification, section 11.3.1 for details. 0 : eop generation is normal 1 : eop generation is disabled 2:1 current_sns over-current sense: selects cu rrent sensing on all ports (ganged); a port- by-port basis (individual); or none (for bus-powered hubs only). the ability to support current sensing on a ganged or port-by-port basis is hardware implementation dependent. 00 : ganged sensing 01 : individual sensing 1x : over-current sensing not supported (use with bus-powered configurations)
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 31 revision 2.2 (02-17-12) datasheet 5.1.8 register 07h: conf iguration data byte 2 0 port_pwr port power switching: enables pow er switching on all ports (ganged) or a port-by-port basis (individual). the ab ility to support pow er enabling on a ganged or port-by-port basis is hardware implementation dependent. 0 : ganged switching 1 : individual switching bit number bit name description 7 dynamic dynamic power enable: controls the ability of the hub to automatically change from self-powered to bus-powered operation if the local power source is removed or unavailable. it c an also go from bus-powered to self- powered operation if the local power source is restored. when dynamic power switching is enabled, the hub detects the availability of a local power source by monitoring local_pwr . if the hub detects a change in power source availability, the hub immediately disconnects and removes power from all downstream devices. it also disconnects the upstream port. the hub will then re-attach to the upstream port as either a bus-powered hub (if local power is unav ailable) or a self-powered hub (if local power is available). 0 : no dynamic auto-switching 1 : dynamic auto-switching capable 6 rsvd 5:4 oc_timer over current timer delay: 00 : 0.1 ms 01 : 4.0 ms 10 : 8.0 ms 11 : 16.0 ms 3 compound compound device: indicates the hub is part of a compound device (see the usb specification for definition). the applicable port(s) must also be defined as having a non-removable device. note: when configured via strapping options, declaring a port as non- removable automatically causes the hub controller to report that it is part of a compound device. 0 : no 1 : yes, the hub is pa rt of a compound device 2:0 rsvd bit number bit name description
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 32 smsc usb251xb/xbi datasheet 5.1.9 register 08h: conf iguration data byte 3 5.1.10 register 09h: non-removable device bit number bit name description 7:4 rsvd 3 prtmap_en port mapping enable: selects the method used by the hub to assign port numbers and disable ports. 0 : standard mode 1 : port mapping mode 2:1 rsvd 0 string_en enables string descriptor support 0 : string support disabled 1 : string support enabled bit number bit name description 7:0 nr_device non-removable device: indicates which port has a non-removable device. 0 : port is removable 1 : port is non-removable bit 7 : rsvd bit 6 : rsvd bit 5 : rsvd bit 4 : controls port 4 bit 3 : controls port 3 bit 2 : controls port 2 bit 1 : controls port 1 bit 0 : rsvd note: the device must provide its own descriptor data. when using the default configuration, the non_rem[1:0] pins will designate the appropriate ports as being non-removable.
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 33 revision 2.2 (02-17-12) datasheet 5.1.11 register 0ah: port disab le for self-powered operation 5.1.12 register 0bh: port disab le for bus-powered operation bit number bit name description 7:0 port_dis_sp port disable self-powered: disables one or more ports. 0 = port is available 1 = port is disabled bit 7 : rsvd bit 6 : rsvd bit 5 : rsvd bit 4 : controls port 4 bit 3 : controls port 3 bit 2 : controls port 2 bit 1 : controls port 1 bit 0 : rsvd during self-powered operation when mapping mode is disabled ( prtmap_en = 0), this register selects the ports that will be permanently disabled. these ports are then unavailable and cannot be enabled or enumerated by a host controller. the ports can be disabled in any order, where the internal logic will automatically report the correct number of enabled ports to the usb host. the acti ve ports will be reordered in order to ensure proper function. when using the default configuration, prt_dis_p[x:1] and prt_dis_m[x:1] pins disable the appropriate ports. bit number bit name description 7:0 port_dis_bp port disable bus-powered: disables one or more ports. 0 = port is available 1 = port is disabled bit 7 : rsvd bit 6 : rsvd bit 5 : rsvd bit 4 : controls port 4 bit 3 : controls port 3 bit 2 : controls port 2 bit 1 : controls port 1 bit 0 : rsvd during self-powered operation when mapping mode is disabled ( prtmap_en = 0), this selects the ports which will be permanently disabled.these ports are then unav ailable and cannot be enabled or enumerated by a host controller. the ports can be disabled in any order, where the internal logic will automatically report the correct number of enabled ports to the usb host. the acti ve ports will be reordered in order to ensure proper function. when using the internal default option, the prt_dis_p[x:1] and prt_dis_m[x:1] pins disable the appropriate ports.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 34 smsc usb251xb/xbi datasheet 5.1.13 register 0ch: max powe r for self-powered operation 5.1.14 register 0dh: max powe r for bus-powered operation 5.1.15 register 0eh: hub controller max current for self-powered operation bit number bit name description 7:0 max_pwr_sp max power self-powered: the value in 2 ma increments that the hub consumes from an upstream port (vbu s) when operating as a self-powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device. the embedded peripheral reports 0 ma in its descriptors. note: the usb 2.0 specification does not permit this value to exceed 100 ma bit number bit name description 7:0 max_pwr_bp max power bus-powered: the value in 2 ma increments that the hub consumes from an upstream port (vbu s) when operating as a bus-powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device. the embedded peripheral reports 0 ma in its descriptors. bit number bit name description 7:0 hc_max_c_sp hub controller max current self-powered: the value in 2 ma increments that the hub consumes from an upstream port (vbus) when operating as a self- powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value does not include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. note: the usb 2.0 specification does not permit this value to exceed 100 ma a value of 50 (decimal) indicates 100 ma, which is the default value.
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 35 revision 2.2 (02-17-12) datasheet 5.1.16 register 0fh: hub controller ma x current for bus-powered operation 5.1.17 register 10 h: power-on time 5.1.18 register 11h: language id high 5.1.19 register 12 h: language id low 5.1.20 register 13h: ma nufacturer string length bit number bit name description 7:0 hc_max_c_bp hub controller max current bus-powered: the value in 2 ma increments that the hub consumes from an upstream port (vbus) when operating as a bus- powered hub. this valu e will include the h ub silicon along wi th the combined power consumption (from vbus) of all associated circuitry on the board. note: this value will not include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. a value of 50 (decimal) would indicate 100 ma, which is the default value. bit number bit name description 7:0 power_on_time power-on time: the length of time that it takes (in 2 ms intervals) from the time the host initiated the power-on sequence on a port until the port has adequate power. bit number bit name description 7:0 lang_id_h usb language id: upper 8 bits of a 16-bit id field bit number bit name description 7:0 lang_id_l usb language id: lower 8 bits of a 16-bit id field bit number bit name description 7:0 mfr_str_len manufacturer string length: with a maximum string length of 31 characters (when supported).
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 36 smsc usb251xb/xbi datasheet 5.1.21 register 14h: product string length 5.1.22 register 15h: serial string length 5.1.23 register 16h-53 h: manufacturer string 5.1.24 register 54h-91h: product string bit number bit name description 7:0 prd_str_len product string length: with a maximum string length of 31 characters (when supported). bit number bit name description 7:0 ser_str_len serial string length: with a maximum string length of 31 characters (when supported). bit number bit name description 7:0 mfr_str manufacturer string: unicode utf-16le per usb 2.0 specification : with a maximum string length of 31 characters (when supported). note: the string consists of indivi dual 16-bit unicode utf-16le characters. the characters will be stored starting wi th the lsb at the least significant address and the msb at the next 8-bit location. (subsequent characters must be stored in sequential contiguous addresses in the same lsb, msb manner.) warning: close attention to the byte order of the selected programming tool should be monitored. bit number bit name description 7:0 prd_str product string: unicode utf-16le per usb 2.0 specification when supported, the maximum string length is 31 characters (62 bytes). note: the string consists of indivi dual 16-bit unicode utf-16le characters. the characters will be stored starting wi th the lsb at the least significant address and the msb at the next 8-bit location. (subsequent characters must be stored in sequential contiguous address in the same lsb, msb manner.) warning: close attention to the byte order of the selected programming tool should be monitored.
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 37 revision 2.2 (02-17-12) datasheet 5.1.25 register 92h- cfh: serial string 5.1.26 register d0h: battery charging enable 5.1.27 register f6h: boost_up bit number bit name description 7:0 ser_str serial string: unicode utf-16le per usb 2.0 specification when supported, the maximum string length is 31 characters (62 bytes). note: the string consists of indivi dual 16-bit unicode utf-16le characters. the characters will be stored starting wi th the lsb at the least significant address and the msb at the next 8-bit location. (subsequent characters must be stored in sequential contiguous address in the same lsb, msb manner.) warning: close attention to the byte order of the selected programming tool should be monitored. bit number bit name description 7:0 bc_en battery charging enable: enables the battery charging feature for the corresponding port. 0 : battery charging support is not enabled 1 : battery charging support is enabled bit 7 : rsvd bit 6 : rsvd bit 5 : rsvd bit 4 : controls port 4 bit 3 : controls port 3 bit 2 : controls port 2 bit 1 : controls port 1 bit 0 : rsvd bit number bit name description 7:2 rsvd 1:0 boost_iout usb electrical signaling drive strength boost bit for the upstream port. 00 : normal electrical drive strength - no boost 01 : elevated electrical drive strength - low (~ 4% boost) 10 : elevated electrical drive strength - medium (~ 8% boost) 11 : elevated electrical drive strength - high (~12% boost) note: boost could result in non-usb compliant parameters. therefore, a value of 00 should be implemented unless specific implementation issues require additional signal boosting to correct for degraded usb signalling levels.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 38 smsc usb251xb/xbi datasheet 5.1.28 register f8h: boost_4:0 note: boost could result in non-usb compliant parameters. therefore, a value of 00 should be implemented unless specific implementation issues require additional signal boosting to correct for degraded usb signalling levels. 5.1.29 register fah: port swap bit number bit name description 7:6 boost_iout_4 usb electrical signaling driv e strength boost bit for downstream port 4. 00 : normal electrical drive strength - no boost 01 : elevated electrical drive strength - low (~4% boost) 10 : elevated electrical drive strength - medium (~ 8% boost) 11 : elevated electrical drive strength - high (~12% boost) 5:4 boost_iout_3 usb electrical signaling driv e strength boost bit for downstream port 3. 00 : normal electrical drive strength - no boost 01 : elevated electrical drive strength - low (~4% boost) 10 : elevated electrical drive strength - medium (~ 8% boost) 11 : elevated electrical drive strength - high (~12% boost) 3:2 boost_iout_2 usb electrical signaling driv e strength boost bit for downstream port 2. 00 : normal electrical drive strength - no boost 01 : elevated electrical drive strength - low (~4% boost) 10 : elevated electrical drive strength - medium (~ 8% boost) 11 : elevated electrical drive strength - high (~12% boost) 1:0 boost_iout_1 usb electrical signaling driv e strength boost bit for downstream port 1. 00 : normal electrical drive strength - no boost 01 : elevated electrical drive strength - low (~4% boost) 10 : elevated electrical drive strength - medium (~ 8% boost) 11 : elevated electrical drive strength - high (~12% boost) bit number bit name description 7:0 prtsp port swap: swaps the upstream usbdp/usbdm pins ( usbdp_up and usbdm_up ) and the downstream usbdp/usbdm pins ( usbdp_dn[x:1] and usbdp_dn[x:1] ) for ease of board routing to devices and connectors. 0 : usb d+ functionality is associated with the dp pin and d- functionality is associated with the dm pin. 1 : usb d+ functionality is associated with the dm pin and d- functionality is associated with the dp pin. bit 7 : rsvd bit 6 : rsvd bit 5 : rsvd bit 4 : controls port 4 bit 3 : controls port 3 bit 2 : controls port 2 bit 1 : controls port 1 bit 0 : when set to 1 , the upstream port dp/dm is swapped.
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 39 revision 2.2 (02-17-12) datasheet 5.1.30 register fbh: portmap 12 bit number bit name description 7:0 prtr12 portmap register for ports 1 and 2: when a hub is enumerated by a usb host controller, the hub is only permitted to report how many ports it has; the hub is not permitted to select a numerical range or assignment. the host controller will number the downstream ports of the hub starting with the number 1, up to the number of ports that the hub reports having. the host's port number is called the logical port number and the physical port on the hub is the physical port number. when mapping mode is enabled (see prtmap_en , section 5.1.9 on page 32 ) the hub's downstream port numbers can be mapped to different logical port numbers (assigned by the host). note: contiguous logical port numbers must be implemented, starting from number 1 up to the maximum number of enabled ports. this ensures that the hub's ports are nu mbered in accordance with the way a host will communicate with the ports. bit [7:4] 0000 physical port 2 is disabled 0001 physical port 2 is mapped to logical port 1 0010 physical port 2 is mapped to logical port 2 0011 physical port 2 is mapped to logical port 3 0100 physical port 2 is mapped to logical port 4 1000 to 1111 rsvd, will default to 0000 value bit [3:0] 0000 physical port 1 is disabled 0001 physical port 1 is mapped to logical port 1 0010 physical port 1 is mapped to logical port 2 0011 physical port 1 is mapped to logical port 3 0100 physical port 1 is mapped to logical port 4 1000 to 1111 rsvd, will default to 0000 value
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 40 smsc usb251xb/xbi datasheet 5.1.31 register fch: portmap 34 bit number bit name description 7:0 prtr34 portmap register for ports 3 and 4: when a hub is enumerated by a usb host controller, the hub is only permitted to report how many ports it has; the hub is not permitted to select a numerical range or assignment. the host controller will number the downstream ports of the hub starting with the number 1, up to the number of ports that the hub reports having. the host's port number is called the logical port number and the physical port on the hub is the physical port number. when mapping mode is enabled (see prtmap_en , section 5.1.9 on page 32 ) the hub's downstream port numbers can be mapped to different logical port numbers (assigned by the host). note: contiguous logical port numbers must be implemented, starting from number 1 up to the maximum number of enabled ports. this ensures that the hub's ports are nu mbered in accordance with the way a host will communicate with the ports. bit [7:4] 0000 physical port 4 is disabled 0001 physical port 4 is mapped to logical port 1 0010 physical port 4 is mapped to logical port 2 0011 physical port 4 is mapped to logical port 3 0100 physical port 4 is mapped to logical port 4 1000 to 1111 rsvd, will default to 0000 value bit [3:0] 0000 physical port 3 is disabled 0001 physical port 3 is mapped to logical port 1 0010 physical port 3 is mapped to logical port 2 0011 physical port 3 is mapped to logical port 3 0100 physical port 3 is mapped to logical port 4 1000 to 1111 rsvd, will default to 0000 value
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 41 revision 2.2 (02-17-12) datasheet 5.1.32 register ffh: status/command 5.2 i 2 c eeprom the smsc hub can be configured via a 2-wire (i 2 c) eeprom (256x8). see ta b l e 5 . 1 for details on enabling the i 2 c eeprom interface. the i 2 c eeprom interface implem ents a subset of the i 2 c master specification (refer to the philips semiconductor standard i 2 c-bus specification i 2 c protocol for details). the hub?s interface is designed to attach to a single dedicated i 2 c eeprom which conforms to the standard-mode i 2 c specification (100 kbit/s transf er rate and 7-bit addressing) for protocol and electrical compatibility. the i 2 c eeprom shares the same pi ns as the smbus interface, therefore the smbus interface is not available when the i 2 c eeprom interface ha s been enabled (and vice versa). the hub acts as the master and generates the serial clock scl , controls the bus access (determines which device acts as the transmitter and which devic e acts as the receiver), and generates the start and stop conditions. the hub w ill read the external eeprom for configuration dat a and then attach to the upstream usb host. note: if no external eeprom is pr esent, the hub will write 0 to all configuration registers. the hub does not have t he capacity to write to the external eeprom. the hub only has the capability to read from an external eeprom. the external eepr om will be read (even if it is blank), and the hub will be configured with the va lues that are read. any values read for unsupported registers will not be retained (i.e., they will remain as the default values). reserved registers should be set to 0 unless otherwise specified. eeprom reset values are 0x00. contents r ead from unavailabl e registers should be ignored. note: go to www.smsc.com, search for usb251xb and select e2prommap.msi from the documents section to download t he eeprom data configur ation utility tool. 5.2.1 i 2 c slave address the 7-bit slave address is 0101100b. note: 10-bit addressing is not supported. 5.2.2 protocol implementation the hub will only access an eeprom using the sequential read protocol as outlined in chapter 8 of microchip 24aa02/24lc02b [4] . bit number bit name description 7:3 rsvd 2 intf_pw_dn smbus interface power down: 0 : interface is active 1 : interface power down after ack has completed 1 reset reset the smbus interface and internal me mory back to reset_n assertion default settings. 0 : normal run/idle state 1 : force a reset of registers to their default state 0 usb_attach usb attach (and write protect) 0 : smbus slave interface is active 1 : the hub will signal a usb attach event to an upstream device, and the internal memory (address range 0x00-0xfe) is writ e-protected to prevent unintentional data corruption.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 42 smsc usb251xb/xbi datasheet 5.2.3 pull-up resistor the circuit board designer is required to place external pull-up resistors (10 k recommended) on the sda/smbdata and scl/smbclk/cfg_sel[0] lines (per smbus 1.0 specification [3] , and eeprom manufacturer guidelines) to vdd33 in order to assure proper operation. 5.2.4 in-circuit eeprom programming the eeprom can be programmed via automa tic test equipment (ate) by pulling reset_n low (which tri-states the hub?s eeprom interface and allows an external source to program the eeprom). 5.3 smbus the smsc hub can be configured by an external processor via an smbus interface (see ta b l e 5 . 1 for details on enabling the smbus interface). the smbus interface shares the same pins as the eeprom interface, and therefore the hub no longer supports the i 2 c eeprom interface when the smbus interface has been enabled. the smsc hub waits indefinitely for the smbus code load to complete and only appears as a newly connected device on usb after the code load is complete. the hub?s smbus acts as a slave-only smbus device. the implementation only supports block write ( section 5.3.2.1 ) and block read ( section 5.3.2.2 ) protocols, where the avai lable registers are outlined in section 5.1 on page 27 . reference the system management bus specification [3] for additional information. 5.3.1 smbus slave address the 7-bit slave address is 0101100b. the hub will not respond to the general call address of 0000000b. 5.3.2 protocol implementation typical block write and block read protocols are shown in figures 5.1 and 5.2 . register accesses are performed using 7-bit slave addressing, an 8-bit regist er address field, and an 8-bit data field. the shading shown in the figures during a read or write indicates the hub is driving data on the smbdata line; otherwise, host data is on the sda/smbdata line. the smbus slave address assigned to the hub (0101100b) allows it to be identified on the smbus. the register address field is the internal address of the register to be accessed. the register data field is the data that the host is attempting to write to the register or the contents of the register that the host is attempting to read. note: data bytes are transferred msb first.
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 43 revision 2.2 (02-17-12) datasheet 5.3.2.1 block write/read the block write begins with a slave address and a write condition. after the command code, the host issues a byte count which describes how many more bytes will follow in the message. if a slave had 20 bytes to send, the first byte would be the number 20 (14h), followed by the 20 bytes of data. the byte count may not be zero. a block write or read allows a transfer maximum of 32 data bytes. note: for the following smbus tables: figure 5.1 block write 5.3.2.2 block read a block read differs from a block write in that the repeated start condition exists to satisfy the i 2 c specification?s requirement for a change in the transfer direction. figure 5.2 block read 5.3.2.3 invalid protocol response behavior note that any attempt to update registers with an invalid protocol will not be updated. the only valid protocols are write block and read block (described above), where th e hub only responds to the 7-bit hardware selected slave address (0101100b). also, the only valid registers for the hub are outlined in section 5.1 on page 27 . attempts to access any other regi sters will return no response. 5.3.3 slave device timeout devices in a transfer can abort the transfer in prog ress and release the bus when any single clock low interval exceeds 25 ms (t timeout, min ). the master must detect this condition and generate a stop condition within or after the transfer of the interrupted data byte. slave devices must reset their communication and be able to receive a new start condition no later than 35 ms (t timeout, max ). note: some simple devices do not contain a clock low drive circuit; this simple kind of device typically resets its communications port after a start or stop condition. the slave device timeout must be implemented. denotes master-to-slave denotes slave-to-master s slave address register address wr a 17118 a 1 ... 1 81 byte count = n a data byte 1 a data byte 2 a 81 1 1 88 data byte n a p 1 s s slave address register address wr 1711 8 a 1 slave address rd a 711 ... a 81 1 1 88 1 81 p a a a a byte count = n data byte 2 data byte 1 data byte n
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 44 smsc usb251xb/xbi datasheet 5.3.4 stretching the sclk signal the hub supports stretching of the sclk by other devices on the smbus. however, the hub does not stretch the sclk . 5.3.5 smbus timing the smbus slave interface complies with the smbus specification revision 1.0 [3] . see section 2.1, ac specifications on page 3 for more information. 5.3.6 bus reset sequence the smbus slave interface resets and returns to the idle state upon a start condition followed immediately by a stop condition. 5.3.7 smbus alert response address the smbalert# signal is not supported by the hub. 5.4 default configuration to put the smsc hub in the default configuration, strap cfg_sel[1:0] to 00b. this procedure configures the hub to the internal defaults and enables the strapping options. to place the hub in default configuration with overrides, see table 5.1 on page 26 for the list of the options. the internal default values are used for the regi sters that are not controlled by strapping option pins. refer to section 5.1 on page 27 for the internal default values that are loaded when this option is selected. for a list of strapping option pins, see chapter 5 on page 26 , and to configure the strapping pins, see section 3.3.1 on page 22 . 5.5 reset the hub experiences the following two resets: ? hardware reset via the reset_n pin ? usb bus reset 5.5.1 external hardware reset_n a valid hardware reset is defined as assertion of reset_n for a minimum of 1 s after all power supplies are within operating range. while reset is asserted, the hub (and its associated external circuitry) consumes less than 500 a of current from the upstream usb power source. assertion of reset_n causes the following: 1. all downstream ports are disabled, and prtpwr[x:1] to downstream devices is removed (unless bc_en[x:1] is enabled). 2. the phys are disabled, and the differenti al pairs will be in a high-impedance state. 3. all transactions immediately terminate; no states are saved. 4. all internal registers return to the default state (in most cases, 00h). 5. the external crystal oscillator is halted. 6. the pll is halted. the hub is operational 500 s after reset_n is negated. once operational, the hub will do one of the following, depending on configuration: ? read the strapping pins (default configuration with strapping options enabled) ? read configuration information from the external i 2 c eeprom ? wait for configuration over smbus.
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 45 revision 2.2 (02-17-12) datasheet 5.5.1.1 reset_n for strappin g option configuration figure 5.3 reset_n timing for default configuration notes: ? when in bus-powered mode, the hub and its associated circuitry must not consume more than 100 ma from the upstream usb power source during t1+t5. ? all power supplies must have reached the operating levels mandated in chapter 6: dc parameters , prior to (or coincident with) the assertion of reset_n . name description min typ max units t1 reset_n asserted 1 s t2 cfg_sel[1:0] setup time 16.7 ns t3 cfg_sel[1:0] hold time 16.7 1400 ns t4 hub outputs driven to inactive logic states 1.5 2 s t5 usb attach (see notes) 100 ms t6 host acknowledges attach and signals usb reset 100 ms t7 usb idle undefined ms t8 completion time for requests (with or without data stage) 5msec t1 t4 t5 t6 t7 t8 valid driven by hub if strap is an output reset_n vss cfg_sel[2:0] vss hardware reset asserted read cfg_sel[1:0] drive strap outputs to inactive levels attach usb upstream usb reset recovery idle start completion request response t2 t3 don?t care don?t care
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 46 smsc usb251xb/xbi datasheet 5.5.1.2 reset_n for eeprom configuration figure 5.4 reset_n ti ming for eeprom mode notes: ? when in bus-powered mode, the hub and its associated circuitry must not consume more than 100 ma from the upstream usb power source during t6+t7+t8+t9. ? all power supplies must have reached the operating levels mandated in chapter 6: dc parameters , prior to (or coincident with) the assertion of reset_n . name description min typ max units t1 reset_n asserted 1 s t2 cfg_sel[1:0] setup time 16.7 ns t3 cfg_sel[1:0] hold time 16.7 1400 ns t4 hub recovery/stabilization 500 s t5 eeprom read (hub configuration) 2.0 99.5 ms t6 usb attach (see notes) 100 ms t7 host acknowledges attach and signals usb reset 100 ms t8 usb idle undefined ms t9 completion time for requests (with or without data stage) 5ms t1 t5 t7 t8 t9 reset_n vss hardware reset asserted read i 2 c eeprom attach usb upstream usb reset recovery idle start completion request response read cfg_sel[1:0] t2 t3 t6 valid cfg_sel[2:0] vss don?t care don?t care t4
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 47 revision 2.2 (02-17-12) datasheet 5.5.1.3 reset_n for smbus slave configuration figure 5.5 reset_n timing for smbus mode note 5.1 for bus-powered configurations, there is a 99.5 ms max, and the hub and its associated circuitry must not consume more than 10 0 ma from the upstream usb power source during t4+t5+t6+t7+t8+t9. for self-powered configurations, t5 max is not applicable and the time to load the configuration is determined by the external smbus host. note 5.2 all power supplies must have reached the operating levels mandated in chapter 6: dc parameters , prior to (or coincident with) the assertion of reset_n . name description min typ max units t1 reset_n asserted 1 s t2 cfg_sel[1:0] setup time 16.7 ns t3 cfg_sel[1:0] hold time 16.7 1400 ns t4 hub recovery/stabilization 500 s t5 bus smbus code load ( note 5.1 )99.5ms t5 self smbus code load ( note 5.1 ) undefined ms t6 hub configuration and usb attach 100 ms t7 host acknowledges attach and signals usb reset 100 ms t8 usb idle undefined ms t9 completion time for requests (with or without data stage) 5ms t1 t4 t6 t7 t8 t9 reset_n vss hardware reset asserted read cfg_sel[1:0] smbus code load attach usb upstream usb reset recovery idle start completion request response t5 hub phy stabilization valid cfg_sel[2:0] vss don?t care don?t care t2 t3
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 48 smsc usb251xb/xbi datasheet 5.5.2 usb bus reset in response to the upstream port signaling a reset to the hub, the hub does the following: 1. sets default internal usb address to 0 2. sets configuration to: unconfigured 3. negates prtpwr[x:1] to all downstream ports unless battery charging ( bc_en[x:1] ) is enabled 4. clears all tt buffers 5. moves device from suspended to active (if suspended) 6. complies with section 11.10 of the usb 2.0 specification [1] for behavior after completion of the reset sequence. the host then configures the hub and the hub?s downstream port devices in accordance with the usb specification . note: the hub does not propagate the upstream usb reset to downstream devices.
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 49 revision 2.2 (02-17-12) datasheet chapter 6 dc parameters 6.1 maximum guaranteed ratings notes: ? stresses above the specified parameters could c ause permanent damage to the device. this is a stress rating only. therefore, functional opera tion of the device at any condition above those indicated in the operation sections of this specification are not implied. ? when powering this device from laboratory or system power supplies, it is important that the absolute maximum ratings not be exceeded or device failure can result. some power supplies exhibit voltage spikes on their outputs when the ac power is switched on or off. in addition, voltage transients on the ac power line may appear on the dc output. when this possibility exists, it is suggested that a clamp circuit be used. 6.2 operating conditions parameter symbol min max units comments storage temperature t stor -55 150 c lead temperature refer to jedec specification j-std- 020d [5] 3.3 v supply voltage vdd33 vdda33 4.6 v applies to all packages voltage on any i/o pin -0.5 5.5 v voltage on xtalin -0.5 4.0 v voltage on xtalout -0.5 2.5 v parameter symbol min max units comments extended commercial operating temperature t ae 0 85 c ambient temper ature in still air industrial operating temperature t ai -40 85 c ambient temp erature in still air only applies to usb251xbi products 3.3 v supply voltage vdd33 vdda33 3.0 3.6 v applies to all parts 3.3 v supply rise time t rt33 0400 ssee figure 6.1
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 50 smsc usb251xb/xbi datasheet figure 6.1 supply rise time model voltage on any i/o pin -0.3 5.5 v if any 3.3 v supply voltage drops below 3.0 v, then the max becomes: (3.3 v supply voltage) + 0.5 voltage on xtalin -0.3 vdd33 v table 6.1 dc electrical characteristics parameter symbol min typ max units comments i, is type input buffer low input level v ili 0.8 v ttl levels high input level v ihi 2.0 v input leakage i il -10 +10 av in = 0 to vdd33 hysteresis (is only) v hysi 250 350 mv input buffer with pull-up (ipu) low input level v ili 0.8 v ttl levels high input level v ihi 2.0 v low input leakage i ill +35 +90 av in = 0 high input leakage i ihl -10 +10 av in = vdd33 parameter symbol min max units comments t 10% 10% 90% voltage t rt33 t 90% time 100% 3.3 v vss vdd33
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 51 revision 2.2 (02-17-12) datasheet note 6.1 output leakage is measured with the current pins in high impedance. note 6.2 see usb 2.0 specification [1] for usb dc electrical characteristics. input buffer with pull-down (ipd) low input level v ili 0.8 v ttl levels high input level v ihi 2.0 v low input leakage i ill +10 -10 av in = 0 high input leakage i ihl -35 -90 av in = vdd33 usb251xb/xbi iclk input buffer low input level v ilck 0.3 v high input level v ihck 0.9 v input leakage i il -10 +10 av in = 0 to vdd33 o12, i/o12 & i/osd12 type buffer low output level v ol 0.4 v i ol = 12 ma @ vdd33 = 3.3 v high output level v oh 2.4 v i oh = -12 ma @ vdd33 = 3.3 v output leakage i ol -10 +10 a hysteresis (sd pad only) i hysc 250 350 mv v in = vdd33 ( notes: ) table 6.2 supply current unconfigured: hi-speed host (i ccinths ) part min typ max units comments usb2512b/12bi 40 45 ma usb2513b/13bi 40 45 ma usb2514b/14bi 45 50 ma table 6.1 dc electrical ch aracteristics (continued) parameter symbol min typ max units comments
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 52 smsc usb251xb/xbi datasheet table 6.3 supply current unconfigured: full-speed host (i ccintfs ) part min typ max units comments usb2512b/12bi 35 40 ma usb2513b/13bi 35 40 ma usb2514b/14bi 35 40 ma table 6.4 supply current configured: hi-speed host (i hch1 ) part min typ max units comments usb2512b 60 65 ma this is the base current of one downstream port. usb2512bi 60 70 ma usb2513b 65 70 ma usb2513bi 65 75 ma usb2514b 70 80 ma usb2514bi 70 85 ma usb251xb/xbi supply current configured hi-speed host , each additional downstream port 1 port base + 25 ma 1 port base + 25 ma ma table 6.5 supply current configured: full-speed host (i fcc1 ) part min typ max units comments usb2512b 45 50 ma base current of one downstream port usb2512bi 45 55 ma usb2513b 50 55 ma usb2513bi 50 60 ma usb2514b 50 60 ma usb2514bi 50 65 ma usb251xb/xbi supply current configured full-speed host , each additional downstream port 1 port base + 8 ma 1 port base + 8 ma ma
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 53 revision 2.2 (02-17-12) datasheet note 6.3 capacitance t a = 25c; fc = 1 mhz; vdd33 = 3.3 v table 6.6 supply current suspend (i csby ) part min typ max units comments usb2512b 475 1000 a all supplies combined usb2512bi 475 1200 a usb2513b 500 1100 a usb2513bi 500 1300 a usb2514b 550 1200 a usb2514bi 550 1500 a table 6.7 supply current reset (i crst ) part min typ max units comments usb2512b 550 1100 a all supplies combined usb2512bi 550 1250 a usb2513b 650 1200 a usb2513bi 650 1400 a usb2514b 750 1400 a usb2514bi 750 1600 a table 6.8 pin capacitance limits parameter symbol min typ max unit test condition clock input capacitance c xtal 6 pf all pins except usb pins and the pins under the test tied to ac ground input capacitance c in 6pf( note 6.3 ) output capacitance c out 6pf
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 54 smsc usb251xb/xbi datasheet 6.2.1 package thermal specifications thermal parameters are measured or estimated for dev ices with the exposed pad soldered to thermal vias in a multilayer 2s2p pcb per jesd51. ther mal resistance is measured from the die to the ambient air. the values prov ided are based on the package body, die size, maximum power consumption, 85c ambient temperature, and 125c junction temperature of the die. table 6.9 package thermal resistance parameters use the following formulas to calculate the junction temperature: t j = p x ja + t a t j = p x jt + t t symbol usb2512b/12bi usb2513b/13bi usb2514b/14bi ( c/w ) velocity (meters/s) ja 40.1 0 35.0 1 jt 0.5 0 0.7 1 jc 6.3 0 6.3 1 table 6.10 package thermal resistance parameters symbol usb2512b/12bi usb2513b/13bi usb2514b/14bi ( c/w ) velocity (meters/s) ja 40.1 0 35.0 1 jt 0.5 0 0.7 1 jc 6.3 0 6.3 1
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 55 revision 2.2 (02-17-12) datasheet t j = p x jc + t c max power supported = (t j max. spec. x t amb. )/ ja table 6.11 legend symbol description t j junction temperature p power dissipated ja junction-to-ambient-temperature jc junction-to-top-of-package jt junction-to-bottom-of-case t a ambient temperature t c temperature of the bottom of the case t t temperature of the top of the case
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 56 smsc usb251xb/xbi datasheet chapter 7 ac specifications 7.1 oscillator/crystal crystal: parallel resonant, fundamental mode, 24 mhz 350 ppm figure 7.1 typical crystal circuit figure 7.2 formula to find the value of c 1 and c 2 note 7.1 c 0 is usually included (subtracted by the crys tal manufacturer) in the specification for c l and should be set to 0 for use in the calculation of the capacitance formulas in figure 7.2 . however, the pcb itself may presen t a parasitic capacitance between xtalin and xtalout . for an accurate calculation of c 1 and c 2 , take the parasitic capacitance between traces xtalin and xtalout into account. note 7.2 each of these capacitance values is typically around 18 pf. table 7.1 crystal circuit legend symbol description in accordance with c 0 crystal shunt capacitance crystal manufacturer?s specification ( note 7.1 ) c l crystal load capacitance c b total board or trace capacitance oem board design c s stray capacitance smsc ic and oem board design c xtal xtal pin input capacitance smsc ic c 1 load capacitors installed on oem board calculated values based on figure 7.2 ( note 7.2 ) c 2 c 1 c 2 c l 1 m crystal xtal2 (c s2 = c b2 + c xtal2 ) xtal1 (c s1 = c b1 + c xtal1 ) c 0 c 1 = 2 x (c l ? c 0 ) ? c s1 c 2 = 2 x (c l ? c 0 ) ? c s2
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 57 revision 2.2 (02-17-12) datasheet 7.2 external clock 50% duty cycle 10%, 24 mhz 350 ppm, jitter < 100 ps rms. the external clock is recommended to confor m to the signaling level designated in the jesd76-2 specification [5] on 1.2 v cmos logic. xtalout should be treated as a weak (<1ma) buffer output. 7.2.1 smbus interface the smsc hub conforms to all voltage, power, a nd timing characteristics and specifications as set forth in the smbus 1.0 specification [3] for slave-only devices (except as noted in section 5.3: smbus on page 42 . 7.2.2 i 2 c eeprom clock frequency is fixed at 60 khz 20 %. 7.2.3 usb 2.0 the smsc hub conforms to all voltage, power, a nd timing characteristics and specifications as set forth in the usb 2.0 specification [1] .
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 58 smsc usb251xb/xbi datasheet chapter 8 package outlines figure 8.1 36-pin qfn, 6x6 mm body, 0.5 mm pitch
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 59 revision 2.2 (02-17-12) datasheet 8.1 tape and reel specifications figure 8.2 36-pin package tape specifications
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 60 smsc usb251xb/xbi datasheet figure 8.3 36-pin package reel specifications
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 61 revision 2.2 (02-17-12) datasheet appendix a (acronyms) i 2 c ? : inter-integrated circuit 1 ocs: over-current sense pcb: printed circuit board phy: physical layer pll: phase-locked loop qfn: quad flat no leads rohs: restriction of hazardous substances directive scl: serial clock sie: serial interface engine smbus: system management bus tt: transaction translator 1.i 2 c is a registered trademark of philips corporation.
usb 2.0 hi-speed hub controller datasheet revision 2.2 (02-17-12) 62 smsc usb251xb/xbi datasheet appendix b (references) [1] universal serial bus specification, version 2.0, april 27, 2000 (12/7/2000 and 5/28/2002 errata) usb implementers forum, inc. http://www.usb.org [2] i 2 c-bus specification version 1.1 nxp (formerly a division of philips). http://www.nxp.com [3] system management bus specification, version 1.0 smbus. http://smbus.org/specs/ [4] microchip 24aa02/24lc02b (revision c) microchip technology inc. http://www.microchip.com/ [5] jedec specifications: jesd76-2 (june 2001) and j-std-020d.1 (march 2008) jedec global standards for the microelectronics industry. http://www.jedec.org/standards-documents
usb 2.0 hi-speed hub controller datasheet smsc usb251xb/xbi 63 revision 2.2 (02-17-12) datasheet datasheet revision history customer revision history revision level & date section/figure/entry correction rev. 2.2 (02-17-12) cover updated clock bullet to remove reference to 48mhz clock support. section 1.1: configurable features on page 8 updated bulleted lists. usb signal drive strength, usb differential pair pin location and downstream port power control / over-current detection items moved from first (strap-configurable) bulleted list to the second (eeprom -configurable) bulleted list. added enabling of battery charging to the first bulleted list. section 3.1: pin configurations on page 11 clarified introductory sentence. table 3.3: usb251xb/xbi pin descriptions on page 19 updated vbus_det buffer type to ?i? and changed description to: ?for self-powered applications with a permanently attached host, this pin must be connected to a dedicated host control output, or connected to the 3.3 v domain that powers the host (typically vdd33 ).? table 3.3: usb251xb/xbi pin descriptions on page 19 updated crfilt and pllfilt pin descriptions. section 7.1: oscillator/crystal on page 56 removed redundant sentence: ?external clock: 50% duty cycle 10%, 24/48 mhz 350 ppm, jitter < 100 ps rms?. this information is provided in section 7.2: external clock on page 57 . chapter 7: ac specifications removed ceramic reso nator information. section 7.2: external clock replaced ?1.8 v cmos logic? with ?1.2 v cmos logic?. updated xtalout description. section 3.3: pin descriptions (grouped by function) updated crfilt and pllfilt pin descriptions. cover, package, all removed the 49-bga option. order code page changed ordering codes for non-industrial usb2513b and usb2514b. last character was changed from ?g? to ?c?. front page removed suppor t for ceramic resonator. rev. 2.1 (02/24/11) section 6.1 and 6.2, dc parameters the 1.2v supply information was added and the graph that includes both 3.3 and 1.2 v rise time was added for 49-bga. rev. 2.1 (02/24/11) all added the 49-bga option. rev. 2.1 (02/22/11) section 6.2.1, package thermal specifications added max power supported = ( t j, max.spec. - t amb)/ ja rev. 2.0 (10/01/10) all general refresh, corrected grammatical errors and unified tone.

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