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november 2008 1 m9999-112008 mic2551 micrel, inc. mic2551 usb transceiver general description the mic2551 is a single chip transceiver that complies with the physical layer specifications of the universal serial bus (usb) 2.0. it supports both full speed (12mbps) and low speed (1.5mbps) operation. it is also designed to operate down to 1.6v in order to be compatible with lower system voltages of most mobile systems. t ypical application system supply voltage usb sie controller vif oe# rcv vp vm dC d+ vbus vtrm gnd dC d+ usb port 41206esda surgx ? gnd gpio mic2551a spd 1.0 f (min) 10 f (max) (see applications information fo r additional suppliers.) vcc sus vpu r s 20 ? / 1% r s 20 ? / 1% v bus 1.5k 1 f con typical application circuit features ? compliant to usb specification revision 2.0 for full speed (12mbs) and low speed (1.5mbps) operation ? compliant to iec-61000-4.2 (level 3) ? separate i/o supply with operation down to 1.6v ?i ntegrated speed select termination supply ? very-low power consumption to meet usb suspend- current requirements ? small tssop and mlf ? packages ? no power supply sequencing requirements ? software controlled re-enumeration applications ? pdas ? palmtops ? cell phones micrel, inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.mic rel.com micro leadframe and mlf are registered trademarks of amkor technology. surgx is a registered trademark of cooper electronics technologies. ordering information part number standard pb-free package mic2551bts mic2551yts 14-pin tssop mic2551bml MIC2551YML 16-pin mlf ?
mic2551 micrel, inc. m9999-112008 2 november 2008 pin description pin number pin number pin name i/o pin function mic2551bts mic2551bml 11 5 vif i system interface supply voltage: used to provide reference supply voltage for system i/o interface signaling. 21 spd i edge rate control: a logic high operates at edge rates for full speed operation. a logic low operates edge rates for low speed operation. 32 rcv* o receive data: output for usb differential data. 43 vp* i/o if oe# = 1, vp = receiver output (+) if oe# = 0, vp = driver input (+) 54 vm* i/o if oe# = 1 vm, = receiver output (-) if oe# = 0, vm = driver input (-) 65 con i connect (input): controls state of vpu. refer to vpu pin description for detail. 76 gnd ground reference. 87 sus i suspend: active-high. turns off internal circuits to reduce supply current. 99 oe#* i output enable: active-low. enables the transceiver to transmit data onto the bus. when not active, the transceiver is in the receive mode. 10/11 10/11 dC, d+* i/o differential data lines conforming to the usb standard. 12 12 vtrm o 3.3v reference supply output: requires a minimum 0.1 f decoupling capacitor for stability, 1 f recommended.4 13 13 vpu o pull-up supply voltage output: used to connect 1.5k ? pull-up speed detect resistor. if con = 1, vpu is high impedance. if con = 0, vpu = 3.3v. 14 14 vbus i usb bus supply voltage: used to power usb transceiver and internal circuitry. 8,16 nc no connect. * see table 1 for description of logic states. pin configuration 1 vif spd rcv vp vm con gnd 14 vbus vpu vtrm d+ d- oe# sus 13 12 11 10 9 8 2 3 4 5 6 7 14-pin tssop 1 2 3 4 12 11 10 9 16 15 14 13 5678 spd rcv vp vm vtrm d+ dC oe# vpu vbus vif nc nc sus gnd con 16-pin mlf ? (ml)
november 2008 3 m9999-112008 mic2551 micrel, inc. sus oe# d+, dC rcv vp/vm function 00 driving active active normal transmit mode 01 receiving active active normal receive mode 10 hi-z 0 not active low power state 11 hi-z 0 active receiving during suspend (low power state) (note 1) note 1. during suspend vp and vm are active in order to detect out of band signaling conditions. table 1. function selection oe# = 0: input output vp vm d+ d- rcv result 0000xse0 01010 logic 0 10101 logic 1 1111x undefined oe# = 1: input output d+ d- vp vm rcv result 0000xse0 01010 logic 0 10101 logic 1 1111x undefined x - undefined table 2. truth table during normal mode
mic2551 micrel, inc. m9999-112008 4 november 2008 absolute maximum ratings (note 1) supply voltage (v bus ) ................................................. 6.5v all other inputs ............................................. C0.5v to 5.5v ambient storage temperature ................. C65 c to +150 c output current (d+, dC) .......................................... 50ma output current (all others) ....................................... 15ma input current ............................................................ 50ma esd, note 3 v bus , d+, dC ........................................................ 11kv all other pins .......................................................... 2kv operating ratings (note 2) ambient operating temperature ................ C40 c to +85 c package thermal resistance tssop ( ja ) ..................................................... 100 c/w mlf ? ( ja ) .......................................................... 59 c/w dc electrical characteristics (system and usb interface) (note 7) v if = 3.6v, v bus = 5v unless otherwise noted; t a = 25 c. bold indicates specifications over temperature, C40 c to 85 c. symbol parameter conditions min typ max units v bus usb supply voltage 4.0 5.25 v v if system i/f supply voltage 1.6 3.6 v v il low-level input voltage, note 4 v if C0.3 0.15v if v v ih high-level input voltage, note 4 0.85v if v if +0.3 v v oh high-level output voltage, note 4 i oh = 20 a 0.9v if v v ol low-level output voltage, note 4 i ol = 20 a 0.1 v i il input leakage current, note 4 C5 5 a symbol parameter conditions min typ max units spd sus oe# voltage load 101 1 5 a 100 1 5 a 001 1 5 a i if vif supply current 0 0 0 vbus = 5.25v 1 5 a 010 vif = 3.6v 1 5 a 100 f = 6mhz cload 325 650 a = 50 pf, note 7 f = 750khz 000 cload = 600 pf 40 75 a note 7 101 800 1100 a 100 3000 5000 a 001 230 350 a 000 400 700 a i vbus vbus supply current 0 1 0 vbus = 5.25v 130 200 a 100 vif = 3.6v f = 6mhz cload 7.3 10 ma = 50 pf, note 7 f = 750khz 000 cload = 600 pf 3.6 5 ma note 7 i vpuleak vpu leakage current con = 1, v pu = 0v C5 5 a i vifleak vif leakage current v if = 3.6v, v bus = 0v C5 5 a v pu pull-up output voltage i term = 200 a, v bus = 4.0 to 5.25v 3.0 3.3 3.6 v r sw internal pull-up termination i term = 10ma, v bus = 4.0 to 5.25v 10 ? esd protection iec-1000-4-2 air discharge 10 pulses 8kv (d+, dC, contact discharge 10 pulses 9kv v bus only)
november 2008 5 m9999-112008 mic2551 micrel, inc. dc electrical characteristics (transceiver) (note 7) symbol parameter conditions min typ max units leakage current i lo hi-z state data line leakage 0v < v in < 3.3v, sus = 1 C10 10 a (suspend mode) input levels v di differential input sensitivity |(d+) C (dC)| 0.2 v v cm differential common mode range includes v di range 0.8 2.5 v v se single ended receiver threshold 0.8 2.0 v receiver hysteresis 200 mv output levels v ol static output low r l = 1.5k ? to 3.6v 0.3 v v oh static output high r l = 15k ? to gnd 2.8 3.6 v capacitance c in transceiver capacitance pin to gnd 10 pf z drv driver output resistance steady state drive 8 16 24 ? ac electrical characteristics (notes 6, 7) driver characteristics (low speed) t r transition rise time c l = 50pf, figure 2 75 ns c l = 600pf 300 t f transition fall time c l = 50pf, figure 2 75 ns c l = 600pf 300 t r , t f rise/fall time matching (t r , t f )80 125 % v crs output signal crossover voltage 1.3 2.0 v driver characteristics (full speed) t r transition rise time c l = 50pf, figure 2 4 20 ns t f transition fall time c l = 50pf, figure 2 4 20 ns t r , t f rise/fall time matching (t r , t f )9 0 111.11 % v crs output signal crossover voltage 1.3 2.0 v transceiver timing t pvz oe# to rcvr tri-state delay figure 1 15 ns t pzd receiver tri-state to transmit delay figure 1 15 ns t pdz oe# to drvr tri-state delay figure 1 15 ns t pzv driver tri-state to receive delay figure 1 15 ns t plh vp, vm to d+, dC propagation delay figure 4 15 ns t phl t plh d+, dC to rcv propagation delay figure 3 15 ns t phl t plh d+, dC to v p , v m propagation delay figure 3 8 ns t phl note 1. exceeding the absolute maximum rating may damage the device. note 2. the device is not guaranteed to function outside its operating rating. note 3. devices are esd sensitive. handling precautions recommended. human body model, 1.5k in series with 100pf. note 4. specification applies to the following pins: sus, spd, rcv, con, rcv, vp, vm, oe#. note 5. characterized specification(s), but not production tested. note 6. all ac parameters guaranteed by design but not production tested. note 7. specification for packaged product only.
mic2551 micrel, inc. m9999-112008 6 november 2008 timi ng diagrams t pvz oe# v p /v m d+/dC transmit receive t pzd t pdz t pzv figure 1. enable and disable times t r rise time fall time differential data lines 10% 90% 10% 90% t f figure 2. rise and fall times t plh v crs v ss v ol v oh dC d+ v crs differential data lines t phl figure 3. receiver propagation delay t plh v crs v ol v oh dC d+ v crs differential data lines t phl figure 4. driver propagation delay t est circuits d.u.t. 25pf figure 5. load for v p , v m , rcv d.u.t. c l 15k 20 ? vtrm 15 k figure 6. load for d+, dC
november 2008 7 m9999-112008 mic2551 micrel, inc. functional description the mic2551 is designed to provide usb connectivity in mobile systems where available system supply voltages are not able to satisfy usb requirements. the mic2551 can operate down to supply voltages of 1.6v and still meet usb physical layer specifications. as shown in the circuit above, the mic2551 takes advantage of the usb supply voltage, v bus , to operate the transceiver. the system voltage, v if , is used to set the reference voltage used by the digital i/o lines interfacing to the system controller. internal circuitry provides translation between the usb and system voltage domains. v if will typically be the main supply voltage rail for the controller. functional diagram to i n ternal circuitry vbus vterm vpu d+ dC level tr a nslator ldo regulator vif con spd oe# rcv vp vm sus gnd mic2551 block diagram in addition, a 3.3v, 10% termination supply voltage, v pu , is provided to support speed selection. v pu can be disabled or enabled under software control via the con input. this allows for software-controlled connect or disconnect states. a 1.5k resistor is required to be connected between this pin and the d+ or dC lines to respectively specify high speed or low speed operation. the use of esd transient protection devices is not required for operation, but is recommended. the mic2551 is esd rated for 11kv at the vbus and d+, dC pins and 2kv for all other pins.
mic2551 micrel, inc. m9999-112008 8 november 2008 application information power supply configuration the mic2551 can be set up for different power supply configurations which modify the behavior of the device. both v bus and v if have special thresholds that detect when they are either removed or grounded. table 3 depicts the behavior under the different power supply configuration scenarios that are explained below. normal mode v bus is connected to the 5.0v usb bus voltage and v if is connected to a supply voltage in the range of 1.6v to 3.6v. in this case v trm supplies a 3.3v voltage for powering the speed select resistor via v pu depending on the state of the con pin. disconnect mode v if is connected to a supply in a range of 1.6v to 3.6v and v bus is open or grounded. if v bus is opened while transmit- ting, the data lines (d+, dC) have sharing capability and may be driven with external devices up to approximately 3.6v if, and only if, suspend is enabled (sus = 1). with v bus ground, d+, dC sharing mode is not permitted. disable mode v bus is connected to the 5.0v usb bus voltage and v if is open. all logic controlled inputs become high impedances, thus minimal current will be supplied by v if if the input pins are pulled up to an external source. alternate power supply configuration options i/o interface using 3.3v in systems where the i/o interface utilizes a 3.3v usb controller, an alternate solution is shown in figure 7. no extra components are required; however, the load on v trm must not exceed 10ma. mic2551 vif vbus i/o vbus v p /v m / rcv/oe# vtrm usb controller v dd 3.3v figure 7. i/o interface uses 3.3v signal amplitude respective to v if when operating the mic2551, it is necessary to provide input signals which do not exceed v if + 0.3v. external esd protection the use of esd transient protection devices is not required for operation, but is recommended. we recommend the following devices or the equivalent: cooper electronic technologies ( www.cooperet.com ) 41206esda surgx ? 0805esda surgx ? littelfuse ( www.littelfuse.com ) v0402mhs05 sp0503baht non-multiplexed bus in order to save pin count for the usb logic controller interface, the mic2551 was designed with v p and v m as bi- directional pins. to interface the mic2551 with a non-multi- plexed data bus, resistors can be used for low cost isolation as shown in figure 8. v po v p v m v mo usb logic controller (sie) mic2551 v p v m 10k 10k figure 8. mic2551 interface to non-multiplexed data bus configuration mode vbus/vtrm vif notes normal connected connected normal supply configuration and operation. disconnect open connected vp/vm are high outputs, rcv is low. (d+/dC sharing) with oe# = 0 and sus = 1, data lines may be driven with external devices up to 3.6v. with d+, dC floating, i if draws less than 1 a. disconnect ground connected vp/vm are high outputs, rcv is low. with d+, dC floating, i if draws less than 1 a. disable mode connected open logic controlled inputs pins are hi-z. prohibited connected ground prohibited condition. table 3. power supply configuration
november 2008 9 m9999-112008 mic2551 micrel, inc. pcb layout recommendations although the usb standard and applications are not based in an impedance controlled environment, a properly designed pcb layout is recommended for optimal transceiver perfor- mance. the suggested pcb layout hints are as follows: ? match signal line traces (vp/vm, d+, dC) to 40ps, approximately 1 / 3 inch if possible. fr-4 pcb material propagation is about 150ps/inch, so to minimize skew try to keep vp/vm, d+/dC traces as short as possible. ? for every signal line trace width (w), separate the signal lines by 1.5C2 widths. place all other traces at >2 widths from all signal line traces. ? maintain the same number of vias on each differential trace, keeping traces approximately at same separation distance along the line. ? control signal line impedances to 10%. ? keep r s as close to the ic as possible, with equal distance between r s and the ic for both d+ and dC.
mic2551 micrel, inc. m9999-112008 10 november 2008 package information 1.10 max (0.043) 0.15 (0.006) 0.05 (0.002) 1.00 (0.039) ref 0.65 bsc (0.026) 8 0 6.4 bsc (0.252) 5.10 (0.200) 4.90 (0.193) 0.20 (0.008) 0.09 (0.003) 0.70 (0.028) 0.50 (0.020) dimensions: mm (inch) 4.50 (0.177) 4.30 (0.169) 0.30 (0.012) 0.19 (0.007) 14-lead tssop (ts) 3.00bsc 2.75bsc 0.50 dia 3.00bsc 12 max seating plane 2.75bsc 16 1 1 2 3 4 n 2 3 4 0.85 +0.15 C0.65 0.65 +0.15 C0.65 0.01 +0.04 C0.01 0.23 +0.07 C0.05 0.01 +0.04 C0.01 0.42 +0.18 C0.18 0.42 +0.18 C0.18 0.23 +0.07 C0.05 1.60 +0.10 C0.10 pin 1 id 0.5 bsc 1.5 ref 0.42 +0.18 C0.18 1.60 +0.10 C0.10 0.40 +0.05 C0.05 0.20 ref. 0.5bsc section "c-c" scale: none for even terminal/side t op view bottom view 1. dimensions are in mm. 2. die thickness allowable is 0.305mm max. 3. package warpage max 0.05mm. 4. this dimension applies to plated terminal and is measured between 0.20mm and 0.25mm from tip. 5. applies only for terminals cc c l 4 rev. 02 16-pin mlf ? (ml)
november 2008 11 m9999-112008 mic2551 micrel, inc. 16-pin mlf ? (ml) micrel inc. 2180 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com this information furnished by micrel in this data sheet is believed to be accurate and reliable. however no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intend ed for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant inj ury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is a purchasers own risk and purchaser a grees to fully indemnify micrel for any damages resulting from such use or sale. ? 2004 micrel, incorporated.

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