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may 2004 1 m9999-051004 MIC2550A micrel MIC2550A universal serial bus transceiver general description the MIC2550A is a single-chip transceiver that complies with the physical layer specifications for universal serial bus (usb). the MIC2550A supports full-speed (12mbps) and low-speed (1.5mbps) operation and introduces superior edge rate con- trol to produce crisper eye diagrams. as a result, the task of passing usb compliance testing is made easier. a unique, patented, dual supply voltage operation allows the MIC2550A to reference the system i/f i/o signals to a supply voltage down to 2.5v while independently powered by the usb v bus . this allows the system interface to operate at its core voltage without addition of buffering logic and also reduce system operating current. system diagram features ? compliant to usb specification revision 2.0 for low-speed (1.5mbps) and full-speed (12mbps) operation ? compliant to iec-61000-4.2 (level 2) ? operation down to 2.5v ? dual supply voltage operation ? integrated speed-select termination supply ? very low power consumption meets usb suspend- current requirements ? small 14-pin tssop and 16-pin mlf? packages applications ? personal digital assistants (pda) ? palmtop computers ? cellular telephones ordering information part number package MIC2550Abts 14-pin tssop MIC2550Abml 16-pin mlf? system supply voltage system interface vif spd oe# rcv vp d C vm d C d+ vbus vtrm gnd d C d+ v bus usb interface connector cooper electronics technologies 41206esda surgx ? gnd r s 24 ? r s 24 ? 1.5k gnd high speed low speed MIC2550A sus 1 f 1 f min 10 f max 0.47 f (see applications information for additional suppliers.) micrel, inc. ?1849 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 trademarks of amkor technology. surgx is a registered trademark of cooper electronics technologies.
MIC2550A micrel m9999-051004 2 may 2004 pin description pin name pin number pin number pin function MIC2550Abts MIC2550Abml vif 1 15 system interface supply voltage (input): determines logic voltage levels for system interface signaling to logic controller. spd 2 1 speed (input): edge rate control. logic high selects full-speed edge rates. logic low selects low-speed edge rates. rcv 3 2 receive data (output): system interface receive data interface to logic controller. vp 4 3 plus (input/output): system interface signal to logic controller. if oe# is logic 1, vp is a receiver output (+); if oe# is logic 0, vp is a driver input (+). vm 5 4 minus (input/output): system interface signal to logic controller. if oe# is logic 1, vm is a receiver output ( C ); if oe# is logic 0, vm is a driver input ( C ). nc 6, 13 5, 8, 13 16 not internally connected gnd 7 6 ground: power supply return and signal reference. sus 8 7 suspend (input): logic high turns off internal circuits to reduce supply current. oe# 9 9 output enable (input): active low system interface input signal from logic controller. logic low causes transceiver to transmit data onto the bus. logic high causes the transceiver to receive data from the bus. d C 10 10 usb differential data line C (input/output) d+ 11 11 usb differential data line + (input/output) vtrm 12 12 termination supply (output): 3.3v speed termination resistor supply output. vbus 14 14 usb supply voltage (input): transceiver supply. pin configuration 1 vif spd rcv vp vm nc gnd 14 vbus nc vtrm d+ d C oe# sus 13 12 11 10 9 8 2 3 4 5 6 7 14-pin tssop (tm) 1 2 3 4 12 11 10 9 16 15 14 13 5678 spd rcv vp vm vtrm d+ d oe# nc vbus vif nc nc sus gnd nc 16-pin mlf (ml)
may 2004 3 m9999-051004 MIC2550A micrel absolute maximum ratings (note 1) supply voltage (v if ) ................................................... +6.5v input voltage (v bus ) ........................ C 0.5v(min)/5.5v(max) output current (i d+ , i d C ) ........................................... 50ma output current (all others) ....................................... 15ma input current ............................................................ 50ma storage temperature (t s ) ......................... C 65 to +150 c esd, note 3 v bus , d+, d C ......................................................... 10kv all other pins ........................................................... 2kv operating ratings (note 2) supply voltage (v bus ) ................................. 4.0v to 5.25v temperature range (t a ) ........................... C 40 c to +85 c junction temperature (t j ) ........................................ 160 c package thermal resistance tssop ( ja ) ..................................................... 100 c/w electrical characteristics t a = 25 c, bold values indicate C 40 c t a +85 c; typical values at v bus = 5.0v, v if = 3.0v; minimum and maximum values at v bus = 4.0v to 5.25v, v if = 2.5v to 3.6v; unless noted. symbol parameter condition min typ max units system and usb interface dc characteristics v bus usb supply voltage 4.0 5.25 v v if system i/f supply voltage 2.5 5.25 v v il low-level input voltage, note 4 0.15v if v v ih high-level input voltage, note 4 0.85v if 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 5 a i if system i/f supply current d C and d+ are idle, v if = 3.6v, v bus = 5.25v 1 a sus = 1, oe# = 1 d C and d+ are idle, v if = 3.6v, v bus = 5.25v 1 a sus = 0, oe# = 1 d C and d+ active, c load = 50pf, spd = 1, 325 a sus = 0, v if = 3.6v, oe# = 0, f = 6mhz, note 7 d C and d+ active, c load = 600pf, spd = 0, 40 a sus = 0, v if = 3.6v, oe# = 0, f = 750khz, note 7 i bus usb supply current d C and d+ are idle, v bus = 5.25v, spd = 0 140 200 a sus = 1, oe# = 1 d C and d+ are idle, v bus = 5.25v, spd = 1 140 200 a sus = 1, oe# = 1 d C and d+ are idle, v bus = 5.25v, spd = 0 140 200 a sus = 0, oe# = 0 d C and d+ are idle, v bus = 5.25v, spd = 1 200 500 a sus = 0, oe# = 1 d C and d+ active, c load = 50pf, spd = 1, 6.75 ma sus = 0, v bus = 5.25v, f = 6mhz, oe# = 0, note 7 d C and d+ active, c load = 600pf, spd = 0 4.25 ma sus = 0, v bus = 5.25v, f = 750khz, oe# = 0, note 7 v trm termination voltage i trm = 2.5ma 3.0 3.6 v esd protection iec-1000-4-2 air discharge 10 pulses 6kv (d+, d C , contact discharge 10 pulses 6kv v bus only)
MIC2550A micrel m9999-051004 4 may 2004 symbol parameter condition min typ max units transceiver dc characteristics i lo hi-z state data line leakage 0v < v bus < 3.3v, d+, d C , oe# = 1 pins only C 10 +10 a v di differential input sensitivity |(d+) C (d C )|, v in = 0.8v C 2.5v 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, note 6 200 mv v ol static output low, note 5 oe# = 0, r l = 1.5k ? to 3.6v 0.3 v v oh static output high, note 5 oe# = 0, r l = 15k ? to gnd 2.8 3.6 v v crs output signal crossover voltage 1.3 2.0 v note 6 c in transceiver capacitance, note 6 pin to gnd 20 pf z drv driver output resistance steady state drive, note 6 618 ? low-speed driver characteristics, note 7 t r transition rise time c l = 50pf 75 ns c l = 600pf 300 ns t f transition fall time c l = 50pf 75 ns c l = 600pf 300 ns t r /t f rise and fall time matching t r t f 80 125 % v crs output signal crossover voltage 1.3 2.0 v full-speed driver characteristics, note 7 t r transition rise time c l = 50pf 4 20 ns t f transition fall time c l = 50pf 4 20 ns t r /t f rise and fall time matching t r t f 90 111.11 % v crs output signal crossover voltage 1.3 2.0 v transceiver timing, note 7 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 receiver delay figure 1 15 ns t plh v+/v C to d+/d C propagation delay figure 4 15 ns t phl v+/v C to d+/d C propagation delay figure 4 15 ns t plh d+/d C to rcv propagation delay figure 3 15 ns t phl d+/d C to rcv propagation delay figure 3 15 ns t plh d+/d C to v+/d C propagation delay figure 3 8 ns t phl d+/d C to v+/d C propagation delay figure 3 8 ns 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. applies to the vp, vm, rcv, oe#, spd, and sus pins. note 5. applies to d+, d C . note 6. not production tested. guaranteed by design. note 7. characterized specification(s), but not production tested.
may 2004 5 m9999-051004 MIC2550A micrel v m v p v p /v m t pvz t pzv v oe# h l t pzd v d+ /v d v d C v d+ figure 1. enable and disable times 10% v d C v d+ differential data lines 90% t r t f v crs figure 2. rise and fall times v d C v d+ differential data lines t plh t phl output v oh v ol v ss figure 3. receiver propagation delay d+/d to rcv, v p , and v m v d C v d+ differential data lines t plh t phl input v oi v ol v ss figure 4. driver propagation delay v p and v m to d+/d timing diagrams
MIC2550A micrel m9999-051004 6 may 2004 : ) t i m s n a r t ( 0 = # e o t u p n it u p t u o t l u s e r p vm v+ d dv c r 0000x 0 e s 01010 0 c i g o l 10101 1 c i g o l 1111x d e n i f e d n u : ) e v i e c e r ( 1 = # e o t u p n it u p t u o t l u s e r + d dp vm vv c r 0000x 0 e s 01010 0 c i g o l 10101 1 c i g o l 1111x d e n i f e d n u note. x = undefined. table 1. truth table test circuits device under test 50pf 24 ? for d+, d : v = 0v for t pzh and t phz v = v bus for t pzl and t plz v test point 500 ? figure 5. load for enable and disable time (d+, d ) device under test 25pf figure 6. v p , v m and rcv load device under test 15k ? c l v trm 1.5k ? * 24 ? c l = 50pf, full speed c l = 50pf, low speed (minimum timing) c l = 600pf, low speed (maximum timing) *1.5k on d C for low speed or d+ for high speed figure 7. d+ and d load
may 2004 7 m9999-051004 MIC2550A micrel block diagram regulator vm gnd vp rcv oe# spd vif d C d+ vbus vtrm usb voltage domain system i/f voltage domain to internal circuits sus
MIC2550A micrel m9999-051004 8 may 2004 applications information the MIC2550A is designed to provide usb connectivity in mobile systems where system supply voltages are not avail- able to satisfy usb requirements. the MIC2550A can oper- ate down to supply voltages of 2.5v and still meet usb physical layer specifications. as shown in the system dia- gram, the MIC2550A takes advantage of usb s supply voltage, v bus , to operate the transceiver. the system volt- age, v if , is used to set the reference voltage used by the digital i/o lines (vp, vm, rcv, oe#, spd, and sus pins) interfacing to the system. internal circuitry provides transla- tion between the usb and system voltage domains. v if will typically be the main supply voltage rail for the system. in addition, a 3.3v, 10% termination supply voltage, v trm , is provided to support speed selection. a 0.47 f (minimum) capacitor from v trm to ground is required to ensure stability. a 1.5k resistor is required between this pin and the d+ or d C lines to respectively specify full-speed or low-speed opera- tion. power supply configurations v if / v bus switched when the v bus input pin is pulled to ground a low impedance path between v if and v bus can cause a high current flow from v if to v bus thereby damaging the MIC2550A. this issue can arise in systems where v bus is driven from a power supply that can be switched off such as in the case of a desktop pc. adding a schottky diode, such as the zhcs1000 by zetex, in series with v bus will prevent any current flow during this condition. a solution is shown in figure 8 below. if the v if source is current limited to less than 50ma, then diode d1 is not necessary. MIC2550A vif note: *(optional) see text - power supply configurations vbus 1 f min vbus usb device power controller *(optional) d1 zhcs1000 or equivelant figure 8. solution to v if /v bus switching 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 9. this configuration has the advantage over figure 8, in that no extra components are needed. ensure that the load on v trm does not exceed 1ma total. MIC2550A vif vbus i/o vbus v p /v m / rcv/oe# vtrm usb controller v dd 3.3v figure 9. i/o interface using 3.3v internal 3.3v source if the device is self-powered and has 3.3v available, the circuit in figure 10 is yet another power supply configuration option. in this configuration, the internal regulator is disabled and the 3.3v source and not v bus powers the entire chip. MIC2550A vif 3.3v vbus vtrm figure 10. powering chip from internal 3.3v source suspend when the suspend pin (sus) is high, power consumption is reduced to a minimum. v trm is not disabled. rcv, v p and v m are still functional to enable the device to detect usb activity. for minimal current consumption in suspend mode, it is recommended that oe# = 1, and spd = 0. speed the speed pin (spd) sets d+/d C output edge rates by increas- ing or decreasing biasing current sources within the output drivers. for low speed, spd = 0. for full speed, spd = 1. by setting spd = 0 during idle periods, in conjunction with suspend (sus), the lowest quiescent current can be obtained. however, designers must provide a 300ns delay between changing spd from 0 to 1 and transmission of data at full speed. this delay ensures the output drivers have arrived at their proper operating conditions. failure to do so can result in leading edge distortion on the first few data bits transmitted. 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 electronics technologies (www.cooperet.com) 41206esda surgx ? 0805esda surgx ? littelfuse ( ) v0402mhs05 sp0503baht non-multiplexed bus to save pin count for the usb logic controller interface, the MIC2550A was designed with v p and v m as bidirectional pins. to interface the MIC2550A with a non-multiplexed data bus, resistors can be used for low cost isolation as shown in figure 11. v po v p v m v mo usb logic controller (sie) MIC2550A v p v m 10k 10k figure 11. MIC2550A interface to non-multiplexed data bus
may 2004 9 m9999-051004 MIC2550A micrel 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+, d C ) 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+/d C traces as short as possible. ? for every signal line trace width (w), separate the signal lines by 1.5 C 2 widths. place all other traces at >2w 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 d C .
MIC2550A micrel m9999-051004 10 may 2004 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-pin 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 C 0.65 0.65 +0.15 C 0.65 0.01 +0.04 C 0.01 0.23 +0.07 C 0.05 0.01 +0.04 C 0.01 0.42 +0.18 C 0.18 0.42 +0.18 C 0.18 0.23 +0.07 C 0.05 1.60 +0.10 C 0.10 pin 1 id 0.5 bsc 1.5 ref 0.42 +0.18 C 0.18 1.60 +0.10 C 0.10 0.40 +0.05 C 0.05 0.20 ref. 0.5bsc section "c-c" scale: none top 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)
may 2004 11 m9999-051004 MIC2550A micrel micrel, inc. 1849 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this datasheet is believed to be accurate and reliable. however, no responsibility is as sumed 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 purchaser s use or sale of micrel products for use in life support appliances, devices or systems is at purchaser s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2003 micrel, incorporated. 16-pin mlf (ml)

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