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mobl-usb? tx2 usb 2.0 utmi transceive r CY7C68000A cypress semiconductor corporation ? 198 champion court ? san jose , ca 95134-1709 ? 408-943-2600 document #: 38-08052 rev. *f revised november 16, 2006 mobl-usb ? tx2 features ? utmi-compliant/usb 2.0 certified for device operation ? operates in both usb 2.0 high-speed (hs), 480 mbits/second, and full-speed (fs), 12 mbits/second ? optimized for seamless interface with intel ? monahans applications processors ? tri-state mode allows sharing of utmi bus with other devices ? serial-to-parallel and parallel-to-serial conversions ? 8-bit unidirectional, 8-bit bidire ctional, or 16-bit bidirectional external data interface ? synchronous field and eop detection on receive packets ? synchronous field and eop generation on transmit packets ? data and clock recovery from the usb serial stream ? bit stuffing/unstuffing; bit stuff error detection ? staging register to manage data rate variation due to bit stuffing/unstuffing ? 16-bit 30 mhz and 8-bit 60 mhz parallel interface ? ability to switch between fs and hs terminations and signaling ? supports detection of usb reset, suspend, and resume ? supports hs identification and detection as defined by the usb 2.0 specification ? supports transmission of resume signaling ? 3.3v operation ? two package options: 56-pin qfn and 56-pin vfbga ? all required terminations, including 1.5 kohm pull up on dplus, are internal to chip ? supports usb 2.0 test modes the cypress mobl-usb ? tx2 is a universal serial bus (usb) specification revision 2.0 transceiver, serial/deseri- alizer, to a parallel interface of either 16 bits at 30 mhz or eight bits at 60 mhz. the mobl-usb tx2 provides a high-speed physical layer interface that operates at the maximum allowable usb 2.0 bandwidth. this allows the system designer to keep the complex high-speed analog usb components external to the digital asic which decreases development time and associated risk. a standard interface is provided that is usb 2.0 certified and is compli ant with transceiver macrocell interface (utmi) specificati on version 1.05 dated 3/29/2001. this product is also optimized to seamlessly interface with monahans -p & -l applications processors. it has been characterized by intel and is recommended as the usb 2.0 utmi transceiver of choice for its monahans processors. it is also capable of tri-stating the utmi bus while suspended to allow the bus to be shared with other devices. two packages are defined for the family: 56-pin qfn and 56-pin vfbga. the functional block diagram is shown below. block diagram tri_state
CY7C68000A document #: 38-08052 rev. *f page 2 of 14 applications mobile applications ? smart phones ? pda phones ? gaming phones ? mp3 players ? portable media players (pmp) ? gps tracking devices consumer applications ? cameras ? scanners ? dsl modems ? memory card readers non-consumer applications ?networking ? wireless lan ?home pna functional overview the functionality of this chip is described in the sections below. usb signaling speed the mobl-usb tx2 operates at two of the rates defined in the usb specification 2.0, dated april 27, 2000. ? full speed, with a signaling bit rate of 12 mbps ? high speed, with a signaling bit rate of 480 mbps the mobl-usb tx2 does not support the low-speed (ls) signaling rate of 1.5 mbps. transceiver clock frequency the mobl-usb tx2 has an on-chip oscillator circuit that uses an external 24 mhz (100-ppm) crystal with the following characteristics: ? parallel resonant ? fundamental mode ? 500 w drive level ? 27?33 pf (5% tolerance) load capacitors an on-chip phase-locked loop (pll) multiplies the 24 mhz oscillator up to 30/60 mhz, as required by the transceiver parallel data bus. the default utmi interface clock (clk) frequency is determined by the databus16_8 pin. buses the two packages allow for a 8- or 16-bit bidirectional data bus for data transfers to a controlling unit. suspend and tri-state modes when the mobl-usb tx2 is not in use, the processor can reduce power consumption by putting it into suspend mode using the suspend pin. while in suspend mode, tri-state mode may be enabled, which tri-states all outputs and io?s, allowing the utmi interface pins to be shared with other devices. this is valuable in mobile handset applications, where gpio?s are at a premium. the outputs and io ?s will be tri-stated ~50ns following tri-state mode being enabled, and will be driven ~50ns following tri-state mode being disabled. all inputs must not be left floating while in tri-state mode. when resuming after a suspend, the pll stabilizes approxi- mately 200 s after the suspend pin goes high. reset pin an input pin (reset) resets the chip. this pin has hysteresis and is active high according to the utmi specification. the internal pll stabilizes approximately 200 s after v cc has reached 3.3 volts. line state the line state output pins linest ate[1:0] are driven by combi- national logic and may be toggling between the ?j? and the ?k? states. they are synchronized to the clk signal for a valid signal. on the clk edge the stat e of these lines reflect the state of the usb data lines. upon the clock edge the ?0? bit of the linestate pins is the state of the dplus line and the ?1? bit of linestate is the dminus lin e. when synchronized, the set- up and hold timing of the linestate is identical to the parallel data bus. full-speed vs. high-speed select the fs vs. hs is done through the use of both xcvrselect and the termselect input signals. the termselect signal enables the 1.5 kohm pull up on to the dplus pin. when termselect is driven low, a se0 is asserted on the usb providing the hs termination and generating the hs idle state on the bus. the xcvrselect signal is the control that selects either the fs trans- ceivers or the hs transceivers. by setting this pin to a?0? the hs transceivers are selected and by setting this bit to a?1? the fs transceivers are selected. operational modes the operational modes are controlled by the opmode signals. the opmode signals are capable of inhibiting normal operation of the transceiver and evoking special test modes. these modes take effect immediately and take precedence over any pending data operations. the transmission data rate when in opmode depends on the state of the xcvrselect input. mode 0 allows the transceiver to operate with normal usb data decoding and encoding. mode 1 allows the transceiver logic to support a soft disconnect feature that tri-stat es both the hs and fs trans- mitters, and removes any termination from the usb, making it appear to an upstream port that the device has been discon- nected from the bus. opmode[1:0] mode description 00 0 normal operation 01 1 non-driving 10 2 disable bit stuffing and nrzi encoding 11 3 reserved
CY7C68000A document #: 38-08052 rev. *f page 3 of 14 mode 2 disables bit stuff and nrzi encoding logic so ?1?s loaded from the data bus becomes ?j?s on the dplus / dminus lines and ?0?s become ?k?s. dplus/dminus impedance termination the CY7C68000A does not require external resistors for usb data line impedance termination or an external pull up resistor on the dplus line. these resist ors are incorporated into the part. they are factory trimmed to meet the requirements of usb 2.0. incorporating these resistors also reduces the pin count on the part. pin assignments the following pages illustrate the individual pin diagrams that are available in the 56-pin qfn and 56-pin vfbga packages. the packages offered use either an 8-bit (6 0 mhz) or 16-bit (30 mhz) bus interface. figure 1. CY7C68000A 56-pin qfn pin assignment d4 d3 v cc d2 reserved d1 d0 clk databus16_8 uni_bidi gnd txvalid v cc validh 56-pin qfn 28 27 26 25 24 23 22 21 20 19 18 17 16 15 43 44 45 46 47 48 49 50 51 52 53 54 55 56 1 2 3 4 5 6 7 8 9 10 11 12 13 14 42 41 40 39 38 37 36 35 34 33 32 31 30 29 gnd d5 reserved d6 d7 d8 d9 reserved d10 d11 v cc d12 gnd d13 txready suspend reset av cc xtalout xtalin agnd av cc dplus dminus agnd xcvrselect termselect opmode0 v cc d14 d15 reserved tri_state rxerror rxactive rxvalid gnd linestate1 linestate0 v cc gnd opmode1 CY7C68000A 56-pin qfn
CY7C68000A document #: 38-08052 rev. *f page 4 of 14 CY7C68000A pin descriptions figure 2. CY7C68000A 56-pin vfbga pin assignment 12345678 a b c d e f g h 1a 2a 3a 4a 5a 6a 7a 8a 1b 2b 3b 4b 5b 6b 7b 8b 1c 2c 3c 4c 5c 6c 7c 8c 1d 2d 7d 8d 1e 2e 7e 8e 1f 2f 3f 4f 5f 6f 7f 8f 1g 2g 3g 4g 5g 6g 7g 8g 1h 2h 3h 4h 5h 6h 7h 8h table 1. pin descriptions [1] qfn vfbga name type default description 4h1avcc powern/a analog v cc this signal provides power to the analog section of the chip. 8h5avcc powern/a analog v cc this signal provides power to the analog section of the chip. 7h4agnd powern/a analog ground connect to ground with as short a path as possible. 11 h8 agnd power n/a analog ground connect to ground with as short a path as possible. 9 h6 dplus i/o/z z usb dplus signal connect to the usb dplus signal. 10 h7 dminus i/o/z z usb dminus signal connect to the usb dminus signal. note 1. unused inputs should not be left floating. tie either high or low as appropriate. outputs that are three-statable should only be pulled up or down to ensure signals at power-up and in standby.
CY7C68000A document #: 38-08052 rev. *f page 5 of 14 49 g8 d0 i/o bidirectional data bus this bidirectional bus is used as the entire data bus in the 8-bit bidirectional mode or the least significant eight bits in the 16-bit mode. under the 8-bit unidirect ional mode, these bits are used as inputs for data, selected by the rxvalid signal. 48 g7 d1 i/o 46 g5 d2 i/o 44 g3 d3 i/o 43 g2 d4 i/o 41 f8 d5 i/o 39 f6 d6 i/o 38 f5 d7 i/o 37 f4 d8 i/o bidirectional data bus this bidirectional bus is used as the upper eight bits of the data bus when in the 16- bit mode, and not used when in the 8- bit bidirectional mode. under the 8-bi t unidirectional mode these bits are used as outputs for data, selected by the txvalid signal. 36 f3 d9 i/o 34 f1 d10 i/o 33 g4 d11 i/o 31 e1 d12 i/o 29 d8 d13 i/o 27 g1 d14 i/o 26 e2 d15 i/o 50 a1 clk output clock this output is used for clocking the receive and transmit parallel data on the d[15:0] bus. 3 b2 reset input n/a active high reset resets the entire chip. this pin can be tied to v cc through a 0.1- f capacitor and to gnd through a 100 k resistor for a 10-ms rc time constant. 12 b3 xcvrselect input n/a transceiver select this signal selects between the full-speed (fs) and the high-speed (hs) transceivers: 0: hs transceiver enabled 1: fs transceiver enabled 13 b4 termselect input n/a termination select this signal selects between the between the full speed (fs) and the high speed (hs) terminations: 0: hs termination 1: fs termination 2 b1 suspend input n/a suspend places the CY7C68000A in a mode that draws minimal power from supplies. shuts do wn all blocks not necessa ry for suspend/resume operations. while suspended, termselect must always be in fs mode to ensure that the 1.5 kohm pull up on dplus remains powered. 0: CY7C68000A circuitry drawing suspend current 1: CY7C68000A circuitry drawing normal current 24 b8 tri_state input tri-state mode enable places the CY7C68000A into tri-state mode which tri-states all outputs and io?s . tri-state mode can only be enabled while suspended. 0: disables tri-state mode 1: enables tri-state mode 19 c2 linestate1 output line state these signals reflect the current state of the single-ended receivers. they are combinatorial un til a ?usable? clk is available then they are synchronized to clk. they dire ctly reflect the current state of the dplus (linestate0) and dminus (linestate1). d? d+ description 0 0 0: se0 0 1 1: ?j? state 1 0 2: ?k? state 1 1 3: se1 table 1. pin descriptions [1] (continued) qfn vfbga name type default description
CY7C68000A document #: 38-08052 rev. *f page 6 of 14 18 c1 linestate0 output line state these signals reflect the current state of the single-ended receivers. they are combinatorial unti l a ?usable? clk is available then they are synchronized to clk. they dire ctly reflect the current state of the dplus (linestate0) and dminus (linestate1). d? d+ description 00?0: se0 01?1: ?j? state 10?2: ?k? state 11?3: se1 15 b6 opmode1 input operational mode these signals select among various operational modes. 10 description 00?0: normal operation 01?1: non-driving 10?2: disable bit stuffing and nrzi encoding 11?3: reserved 14 b5 opmode0 input operational mode these signals select among various operational modes. 10 description 00?0: normal operation 01?1: non-driving 10?2: disable bit stuffing and nrzi encoding 11?3: reserved 54 a5 txvalid input transmit valid this signal indicates that the data bus is valid. the asser- tion of transmit valid initiates sync on the usb. the negation of trans- mit valid initiates eop on the usb. t he start of sync must be initiated on the usb no less than one or no more that two clks after the assertion of txvalid. in hs (xcvrselect = 0) mode, the sync pattern must be asserted on the usb between 8- and 16-bit times after the assertion of txvalid is detected by the transmit state machine. in fs (xcvr = 1), the sync pattern must be asserted on the usb no less than one or more than two clks after the assertion of txvalid is detected by the transmit state machine. 1 a8 txready output transmit data ready if txvalid is asserted, the sie must always have data available for clocking in to the tx holding register on the rising edge of clk. if txvalid is true and txready is asserted at the rising edge of clk, the CY7C68000A will load the data on the data bus into the tx holding register on the next rising edge of clk. at that time, the sie should immediately present the data for the next transfer on the data bus . 21 a4 rxvalid output receive data valid this signal indicates that the dataout bus has valid data. the receive data holding register is full and ready to be unloaded. the sie is expected to latch the dataout bus on the clock edge. 22 b7 rxactive output receive active this signal indicates that the receive state machine has detected sync and is active. rxactive is negated after a bit st uff error or an eop is detected. 23 a6 rxerror output receive error 0 indicates no error. 1 indicates that a receive error has been detected. table 1. pin descriptions [1] (continued) qfn vfbga name type default description
CY7C68000A document #: 38-08052 rev. *f page 7 of 14 56 a7 validh i/o validh this signal indicates that the high-o rder eight bits of a 16-bit data word presented on the data bus are valid. when databus16_8 = 1 and txvalid = 0, validh is an output, indicating that the high-order receive data byte on the data bus is valid. when databus16_8 = 1 and txvalid = 1, validh is an input and indicates that t he high-order transmit data byte, presented on the data bus by the transceiver, is valid. when databus16_8 = 0, validh is undefined. the status of the receive low- order data byte is determined by rxvalid and are present on d0?d7. 51 a2 databus16_8 input data bus 16_8 this signal selects between 8- and 16-bit data transfers. 1?16-bit data path operation enabled. clk = 30 mhz. 0?8-bit data path operation enabled. w hen uni_bidi = 0, d[8:15] are un- defined. when uni_bidi =1, d[0:7] ar e valid on txvalid and d[8:15] are valid on rxvalid. clk = 60 mhz note: databus16_8 is static after power-on reset (por) and is only sampled at the end of reset. 6 h3 xtalin input n/a crystal input connect this signal to a 24 mhz parallel-resonant, funda- mental mode crystal and 20 pf capacitor to gnd. it is also correct to drive xtalin with an external 24 mhz square wave derived from another clock source. 5 h2 xtalout output n/a crystal output connect this signal to a 24 mhz parallel-resonant, funda- mental mode crystal and 30 pf (nominal) capacitor to gnd. if an external clock is used to drive xtalin, leave this pin open. 52 a3 uni_bidi input driving this pin high enables the unidirectional mode when the 8- bit interface is selected . uni_bidi is static after power-on reset (por). 55 c6 v cc power v cc . connect to 3.3v power source. 17 c7 v cc power n/a v cc . connect to 3.3v power source. 28 d7 v cc power n/a v cc . connect to 3.3v power source. 32 e7 v cc power n/a v cc . connect to 3.3v power source. 45 e8 v cc power n/a v cc . connect to 3.3v power source. 53 c4 gnd ground n/a ground. 16 c5 gnd ground n/a ground. 20 c3 gnd ground n/a ground. 30 d1 gnd ground n/a ground. 42 d2 gnd ground n/a ground. 47 g6 reserved input connect pin to ground. 40 f7 reserved input connect pin to ground. 35 f2 reserved input connect pin to ground. 25 c8 reserved input connect pin to ground. table 1. pin descriptions [1] (continued) qfn vfbga name type default description
CY7C68000A document #: 38-08052 rev. *f page 8 of 14 absolute maximum ratings storage temperature ............. .............. ...... ?65c to +150c ambient temperature with powe r supplied ..... 0c to +70c supply voltage to ground potential .............. ?0.5v to +4.0v dc input voltage to any input pin ............................. 5.25 v dc voltage applied to outputs in high-z state .................. ................... ?0.5v to v cc + 0.5v power dissipation .... ................................................630 mw static discharge voltage ........ .............. .............. ......> 2000v max output current, per io pin .................................... 4 ma max output current, all 21?io pins ............................84 ma operating conditions t a (ambient temperature under bias) ............ 0c to +70c supply voltage ...............................................+3.0v to +3.6v ground voltage ................................................................. 0v f osc (oscillator or crystal frequency) ... 24 mhz 100 ppm ................................................................... parallel resonant dc characteristics usb 2.0 transceiver usb 2.0-compliant in fs and hs modes. table 2. dc characteristics parameter description conditions min. typ. max. unit v cc supply voltage 3.0 3.3 3.6 v v ih input high voltage 2 5.25 v v il input low voltage ?0.5 0.8 v i i input leakage current 0< v in < v cc 10 a v oh output voltage high i out = 4 ma 2.4 v v ol output low voltage i out = ?4 ma 0.4 v i oh output current high 4ma i ol output current low 4ma c in input pin capacitance except dplus/dminus/clk 10 pf dplus/dminus/clk 15 pf c load maximum output capacitance output pins 30 pf i susp suspend current connected [2] 228 273 a disconnected [2] 835 a i cc supply current hs mode normal operation opmod[1:0] = 00 175 ma i cc supply current fs mode normal operation opmod[1:0] = 00 90 ma t reset minimum reset time 1.9 ms note 2. connected to the usb includes 1.5 kohm internal pull up. disconnected has the 1.5 kohm internal pull up excluded.
CY7C68000A document #: 38-08052 rev. *f page 9 of 14 ac electrical characteristics usb 2.0 transceiver usb 2.0 certified in fs and hs. timing diagram hs/fs interface timing?60 mhz figure 3. 60-mhz interface timing constraints table 3. 60-mhz interface timing constraints parameters parameter description mi n. typ. max. unit notes t csu_min minimum set-up time for txvalid 4 ns t ch_min minimum hold time for txvalid 1 ns t dsu_min minimum set-up time for da ta (transmit direction) 4 ns t dh_min minimum hold time for data (transmit direction) 1 ns t cco clock to control out time for txready, rxvalid, rxactive and rxerror 18ns t cdo clock to data out time (receive direction) 1 8 ns tcsu_min tch_min tdsu_min tdh_min tcdo tcco datain dataout control_out control_in clk
CY7C68000A document #: 38-08052 rev. *f page 10 of 14 hs/fs interface timing?30 mhz figure 4. 30-mhz timing in terface timing constraints figure 5. tri-state mode timing constraints table 5. tri-state mode timing constraints parameters table 4. 30 mhz timing interfac e timing constraints parameters parameter description min. typ. max. unit notes t csu_min minimum set-up time for txvalid 16 ns t ch_min minimum hold time for txvalid 1 ns t dsu_min minimum set-up time for data (transmit direction) 16 ns t dh_min minimum hold time for data (transmit direction) 1 ns t cco clock to control out time for txready, rxvalid, rxactive and rxerror 120ns t cdo clock to data out time (receive direction) 1 20 ns t vsu_min minimum set-up time for va lidh (transmit direction) 16 ns t vh_min minimum hold time for vali dh (transmit direction) 1 ns t cvo clock to validh out time (receive direction) 1 20 ns tcsu_min tch_min tdsu_min tdh_min tcvo tcco datain dataout control_out control_in clk tcdo tvsu_min tvh_min ttssu ttspd ttspd suspend tri-state output / io xxxx hi-z parameter description min. typ. max. unit notes t tssu minimum set-up time for tri-state 0 ns t tspd propagation delay for tri-state mode 50 ns
CY7C68000A document #: 38-08052 rev. *f page 11 of 14 ordering information table 6. ordering information ordering code package type CY7C68000A-56lfxc 56 qfn CY7C68000A-56baxc 56 vfbga cy3683 mobl-usb tx2 development board package diagrams the mobl-usb tx2 is available in two packages: ? 56-pin qfn ? 56-pin vfbga figure 6. 56-lead quad flatpack no lead package 8 x 8 mm (sawn version) ls56b a 8.10[0.319] 7.90[0.311] 7.90[0.311] 8.10[0.319] 0.20[0.008] ref. 0.04[0.0015] max. c 0.50[0.020] 6.55[0.258] 6.45[0.254] 0.28[0.011] 0.18[0.007] 6.55[0.258] 6.45[0.254] seating plane c 0.08[0.003] 0.30[0.012] 0.50[0.020] 1.00[0.039] max. top view bottom view side view pin #1 corner pin #1 corner e-pad (pad size vary by device type) dimensions in mm[inches] min. max. reference jedec mo-220 51-85187-*a
CY7C68000A document #: 38-08052 rev. *f page 12 of 14 pcb layout recommendations [3] the following recommendations must be followed to ensure reliable high-performance operation. ? at least a four-layer impedanc e controlled board is required to maintain signal quality ? specify impedance targets (ask your board vendor what they can achieve) ? to control impedance, maintain trace widths and trace spacing to within written specifications ? minimize stubs to minimize reflected signals ? connections between the usb connector shell and signal ground must be done near the usb connector ? bypass/flyback capacitors on vbus, near the connector, are recommended ? dplus and dminus trace lengt hs must be kept to within 2 mm of each other in length, with preferred length of 20?30 mm ? maintain a solid ground plane under the dplus and dminus traces. do not allow the plane to be split under these traces ? it is best to have no vias placed on the dplus or dminus trace routing ? isolate the dplus and dminus tr aces from all other signal traces by no less than 10 mm quad flat package no leads (qfn) package design notes electrical contact of the part to the printed circuit board (pcb) is made by soldering the leads on the bottom surface of the package diagrams (continued) figure 7. 56 vfbga (5 x 5 x 1.0 mm) 0.50 pitch, 0.30 ball bz56 top view pin a1 corner 0.50 3.50 5.000.10 bottom view 0.10(4x) 3.50 5.000.10 0.50 ?0.15mcab ?0.05 m c ?0.300.05(56x) a1 corner -b- -a- 1.0 max 0.160 ~0.260 0.080 c 0.45 seating plane 0.21 0.10 c -c- side view 5.000.10 5.000.10 reference jedec: mo-195c package weight: 0.02 grams e g h f d c b a 13 26 5 48 6 7 85 6 2 3 41 e g h f d c b a 001-03901-*b n o t e 3. source for recommendations: ez-usb fx2? pcb design recommendations , http:///www.cypress.com/cfuploads/support/app_notes/fx2_pcb.pdf high- speed usb platform design guidelines , http://www.usb.org/developers/docs/hs_usb_pdg_r1_0.pdf.
CY7C68000A document #: 38-08052 rev. *f page 13 of 14 ? cypress semiconductor corporation, 2006. the information contained herein is subject to change without notice. cypress semic onductor corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a cypress product. nor does it convey or imply any license under patent or ot her rights. cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agr eement with cypress. furthermore, cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to re sult in significant injury to the user. the inclusion of cypress products in life-support systems application implies that the manu facturer assumes all risk of such use and in doing so indemni fies cypress against all charges. package to the pcb. hence, spec ial attention is required to the heat transfer area below the package to provide a good thermal bond to the circuit board. a copper (cu) fill is to be designed into the pcb as a thermal pad under the package. heat is transferred from the mobl-usb tx2 through the device?s metal paddle on the bottom side of the package. heat from here, is conducted to the pcb at the thermal pad. it is then conducted from the thermal pad to the pcb inner ground plane by an array of via. a via is a plated through hole in the pcb with a finished diameter of 13 mil. the qfn?s metal die paddle must be soldered to the pcb?s thermal pad. solder mask is placed on the board top side over each via to resist solder flow into the via. the mask on the top side also minimizes outgassing during the solder reflow process. for further information on this package design, refer to the application note ?surface m ount assembly of amkor?s microleadframe (mlf) technology.? the application note can be downloaded from amkor?s web site from the following url http://www.amkor.com/products/notes_papers/mlfapp note.pdf. the application note provides detailed information on board mounting guidelines, soldering flow, rework process, etc. figure 8 displays a cross-sectional area underneath the package. the cross section is of only one via. the solder paste template needs to be designed to allow at least 50% solder coverage. the thickness of the solder paste template should be 5 mil. it is recommended that ?no clean?, type 3 solder paste be used for mounting the part. nitrogen purge is recom- mended during reflow. figure 9 is a plot of the solder mask pattern image of the assembly (darker area s indicate solder). mobl-usb tx2 is a trademark of cypress semiconductor corporatio n. intel is a registered trademark of intel corporation. all product and company names mention ed in this document are the trademarks of their respective holders. figure 8. crosssection of the area underneath the qfn package 0.017? dia solder mask cu fill cu fill pcb material pcb material 0.013? dia via hole for thermally connecting the qfn to the circuit board ground plane. this figure only shows the top three layers of the circuit board: top solder, pcb dielectric, and the ground plane figure 9. plot of the solder mask (white area)
CY7C68000A document #: 38-08052 rev. *f page 14 of 14 document history page document title: CY7C68000A mobl-usb? tx2 usb 2.0 utmi transceiver document number: 38-08052 rev. ecn no. issue date orig. of change description of change ** 285592 see ecn kku new data sheet *a 427959 see ecn teh addition of vfbga pack age information and pinout, removal of ssop package. edited text and moved figure titles to the top per new template *b 470121 see ecn teh change from preliminary to final data sheet. grammatical and formatting changes *c 476107 see ecn teh this data sheet needs to be posted to the web site under nda *d 491668 see ecn teh addition of tri-state mode *e 498415 see ecn teh update power consumption numbers *f 567869 see ecn teh remove nda requirement

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