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100-mhz differential buffer for pci express and sat a cy28800 cypress semiconductor corporation ? 198 champion court ? san jose , ca 95134-1709 ? 408-943-2600 document #: 38-07723 rev *b revised may 30, 2006 features ? ck409 and ck410 companion buffer ? eight differential 0.7v clock output pairs ? oe_inv input for inverting oe, pwrdwn, and src_stp active levels ? individual oe controls ? low ctc jitter (< 50 ps) ? programmable bandwidth ? src_stp power management control ? smbus block/byte/word read and write support ? 3.3v operation ? pll bypass-configurable ? divide by 2 programmable ? 48-pin ssop package functional description the cy28800 is a differential buffer and serves as a companion device to the ck409 or ck410 clock generator. the device is capable of distributing the serial reference clock (src) in pci express and sata implementations. block diagram pin configuration 48 ssop src_div2# vdd srct_in srcc_in oe_0 oe_3 dift0 difco vss vdd dift1 difc1 oe_1 oe_2 dift2 difc2 vss vdd dift3 difc3 pll/bypass# sclk sdata vdd_a vss_a dift5 oe_6 oe_5 difc6 vdd dift6 oe_inv dift7 difc7 oe_4 lock oe_7 vdd vss dift4 difc5 iref src_stp pwrdwn vss 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 cy28800 vss difc4 high_bw# output control smbus controller output buffer pll1 oe_[7:0] oe_inv src_stp sdata sclk srct_in srcc_in high_bw# pwrdwn dift_0 difc_0 dift_1 difc_1 dift_2 difc_2 dift_3 difc_3 dift_4 difc_4 dift_5 difc_5 dift_6 difc_6 dift_7 difc_7 src_div2# pll/bypass# div
cy28800 document #: 38-07723 rev *b page 2 of 16 serial data interface to enhance the flexibility and function of the clock buffer, a two-signal serial interface is provided. through the serial data interface, various device functions, such as individual clock output buffers, can be individually enabled or disabled. the registers associated with the serial data interface initializes to their default setting upon power-up, and therefore use of this interface is optional. clock device register changes are normally made upon system initia lization, if any are required. the interface canno t be used during syst em operation for power management functions. data protocol the clock driver serial protocol accepts byte write, byte read, block write, and block read operations from the controller. for block write/read operation, the bytes must be accessed in sequential order from lowest to highest byte (most significant bit first) with the ability to st op after any complete byte has been transferred. for byte writ e and byte read operations, the system controller can access indi vidually indexed bytes. the offset of the indexed byte is encoded in the command code, as described in table 1 . the block write and block read protocol is outlined in table 2 while table 3 outlines the correspondi ng byte write and byte read protocol. the slave receiver address is 11011100 (dch). pin description pin name type description 4,5 srct_in, srcc_in i,dif 0.7v differential inputs 8,9;12,13;16,17;2 0,21; 30,29; 34,33;38,37;42,41 dif[t/c][7:0] o,dif 0.7v differential clock outputs 6,7,14,15,35,36,4 3,44 oe_[7:0] i,se 3.3v lvttl input for enabling differential outputs active high if oe_inv = 0 active low if oe_inv = 1 28 high_bw# i,se 3.3v lvttl input for selecting pll bandwidth 0 = high bw, 1 = low bw 45 lock o,se 3.3v lvttl output, transitions high when pl lock is achieved (latched output) 26 pwrdwn i,se 3.3v lvttl input for power down active low if oe_inv = 0 active high if oe_inv = 1 1 src_div2# i,se 3.3v lvttl input for selecting input frequency divided by two, active low 27 src_stp i,se 3.3v lvttl input for src_stp. disables stoppable outputs. active low if oe_inv = 0 active high if oe_inv = 1 23 sclk i,se smbus slave clock input 24 sdata i/o,oc open collector smbus data 46 iref i a precision resistor is attached to this pin to set the differ- ential output current 22 pll/bypass# i 3.3v lvttl input for selecting fan-out or pll operation 48 vdd_a pwr 3.3v power supply for pll 47 vss_a gnd ground for pll 3,10,18,25,32 vss gnd ground for outputs 2,11,19,31,39 vdd pwr 3.3v power supply for outputs 40 oe_inv i, se input strap for setting polarity of oe_[7:0], src_stp, and pwrdwn table 1. command code definition bit description 7 0 = block read or block write operation 1 = byte read or byte write operation (6:0) byte offset for byte read or byte write operation. for block read or blo ck write operations, these bits should be '0000000'
cy28800 document #: 38-07723 rev *b page 3 of 16 table 2. block read and block write protocol block write protocol block read protocol bit description bit description 1 start 1 start 2:8 slave address ? 7 bits 2:8 slave address ? 7 bits 9write = 0 9write = 0 10 acknowledge from slave 10 acknowledge from slave 11:18 command code ? 8 bits '00000000' stands for block operation 11:18 command code ? 8 bits '00000000' stands for block operation 19 acknowledge from slave 19 acknowledge from slave 20:27 byte count from master ? 8 bits 20 repeat start 28 acknowledge from slave 21:27 slave address ? 7 bits 29:36 data byte 0 from master ? 8 bits 28 read = 1 37 acknowledge from slave 29 acknowledge from slave 38:45 data byte 1 from master ? 8 bi ts 30:37 byte count from slave ? 8 bits 46 acknowledge from slave 38 acknowledge from host .... data bytes from master/acknowledge 39:46 data byte 0 from slave ? 8 bits .... data byte n ? 8 bits 47 acknowledge from host .... acknowledge from slave 48:55 data byte 1 from slave ? 8 bits .... stop 56 acknowledge from host .... data bytes from slave/acknowledge .... data byte n from slave ? 8 bits .... acknowledge from host .... stop table 3. byte read and byte write protocol byte write protocol byte read protocol bit description bit description 1 start 1 start 2:8 slave address ? 7 bits 2:8 slave address ? 7 bits 9 write = 0 9 write = 0 10 acknowledge from slave 10 acknowledge from slave 11:18 command code ? 8 bits '100xxxxx' stands for byte operation, bits[6:0] of the command code represents the offset of the byte to be accessed 11:18 command code ? 8 bits '100xxxxx' stands for byte operation, bits[6:0] of the command code represents the offset of the byte to be accessed 19 acknowledge from slave 19 acknowledge from slave 20:27 data byte from master ? 8 bits 20 repeat start 28 acknowledge from slave 21:27 slave address ? 7 bits 29 stop 28 read = 1 29 acknowledge from slave 30:37 data byte from slave ? 8 bits 38 acknowledge from master 39 stop
cy28800 document #: 38-07723 rev *b page 4 of 16 byte 0: control register 0 bit @pup name description 7 0 pwrdwn drive mode power down drive mode 0 = driven when stopped, 1 = tri-state 6 0 src_stp drive mode src stop drive mode 0 = driven when stopped, 1 = tri-state 5 0 reserved reserved 4 0 reserved reserved 3 0 reserved reserved 2 1 high_bw# high_bw# 0 = high bandwidth, 1 = low bandwidth 1 1 pll/bypass# pll/bypass# 0 = fanout buffer, 1 = pll mode 0 1 src_div2# src_div2# configures outpu t frequency at half the input frequency 0 = divided by 2 mode (output = input /2),1 = normal (output = input) byte 1: control register 1 bit @pup name description 7 1 oe_7 dif[t/c]7 output enable 0 = disabled (tri-state) 1 = enabled 6 1 oe_6 dif[t/c]6 output enable 0 = disabled (tri-state) 1 = enabled 5 1 oe_5 dif[t/c]5 output enable 0 = disabled (tri-state) 1 = enabled 4 1 oe_4 dif[t/c]4 output enable 0 = disabled (tri-state) 1 = enabled 3 1 oe_3 dif[t/c]3 output enable 0 = disabled (tri-state) 1 = enabled 2 1 oe_2 dif[t/c]2 output enable 0 = disabled (tri-state) 1 = enabled 1 1 oe_1 dif[t/c]1 output enable 0 = disabled (tri-state) 1 = enabled 0 1 oe_0 dif[t/c]0 output enable 0 = disabled (tri-state) 1 = enabled byte 2: control register 2 bit @pup name description 7 0 src_stp_dif[t/c]7 allow control di f[t/c]7 with assertion of src_stp 0 = free-running 1 = stopped with src_stp 6 0 src_stp_dif[t/c]6 allow control di f[t/c]6 with assertion of src_stp 0 = free-running 1 = stopped with src_stp 5 0 src_stp_dif[t/c]5 allow control di f[t/c]5 with assertion of src_stp 0 = free-running 1 = stopped with src_stp
cy28800 document #: 38-07723 rev *b page 5 of 16 4 0 src_stp_dif[t/c]4 allow control di f[t/c]4 with assertion of src_stp 0 = free-running 1 = stopped with src_stp 3 0 src_stp_dif[t/c]3 allow control di f[t/c]3 with assertion of src_stp 0 = free-running 1 = stopped with src_stp 2 0 src_stp_dif[t/c]2 allow control di f[t/c]2 with assertion of src_stp 0 = free-running 1 = stopped with src_stp 1 0 src_stp_dif[t/c]1 allow control di f[t/c]1 with assertion of src_stp 0 = free-running 1 = stopped with src_stp 0 0 src_stp_dif[t/c]0 allow control di f[t/c]0 with assertion of src_stp 0 = free-running 1 = stopped with src_stp byte 3: control register 3 bit @pup name description 70 reserved 60 reserved 50 reserved 40 reserved 30 reserved 20 reserved 10 reserved 00 reserved byte 4: vendor id register bit @pup name description 7 0 revision code bit 3 6 0 revision code bit 2 5 0 revision code bit 1 4 0 revision code bit 0 3 1 vendor id bit 3 2 0 vendor id bit 2 1 0 vendor id bit 1 0 0 vendor id bit 0 byte 5: control register 5 bit @pup name description 70 reserved 60 reserved 50 reserved 40 reserved 30 reserved 20 reserved 10 reserved 00 reserved byte 2: control register 2 (continued) bit @pup name description
cy28800 document #: 38-07723 rev *b page 6 of 16 oe_inv clarification the oe_inv pin is an input st rap sampled at power-on. the functionality of this input is to set the active level polarities for oe_[7:0], pwrdwn, and src_stp input pins. ?active high? indicates the functionality of the input is asserted when the input voltage level at the pin is high and deasserted when the voltage level at the input is low. ?active low? indicates that the functionality of the input is a sserted when the voltage level at the input is low and deasserted when the voltage level at the input pin is high. see v ih and v il in the dc electrical specifi- cations for input voltage high and low ranges. pwrdwn clarification the pwrdwn pin is an asynchronous input used to shut off all clocks cleanly and instruct the device to evoke power savings mode. it may be active high or active low depending on the strapped value of the oe_inv input. the pwrdwn pin should be asserted prior to shutting off the input clock or power to ensure all clocks shut down in a glitch-free manner. this signal is synchronized internal to the device prior to powering down the clock buffer. pwrdwn is an asynchronous input for powering up the system. when the pwrdwn pin is asserted, all clocks will be held high or tri-stated (depending on the state of the control register drive mode and oe bits) prior to turning off the vco. all clocks will st art and stop withou t any abnormal behavior and meet all ac and dc parameters. this means no glitches, frequency shifting or amplitude abnormalities among others. pwrdwn assertion when the power down pin is sampled as being asserted by two consecutive rising edges of difc, all dift outputs will be held high or tri-stated (depending on the state of the control register drive mode and oe bits) on the next difc high to low transition. when the smbus pwrdwn drive mode bit is programmed to ?0?, all clock outputs will be held with the dift pin driven high at 2 x iref and difc tri-stated. however, if the control register pwrdwn drive mode bit is programmed to ?1?, then both dift and the difc are tri-stated. pwrdwn deassertion the power-up latency is less than 1 ms. this is the time from the deassertion of the pwrdwn pin or the ramping of the power supply or the time from valid src_in input clocks until the time that stable clocks are output from the buffer chip (pll locked). if the control register pwrdwn drive mode bit is programmed to ?1?, all differential outputs must be driven high in less than 300 s of the power down pin deassertion to a voltage greater than 200 mv. oe_inv pwrdwn src oe_[7:0] 0 active low active low active high 1 active high active high active low oe_inv pwrdwn mode 0 0 power down 0 1 normal 1 0 normal 1 1 power down pwrdwn difc dift figure 1. pwrdwn assertion diagram, oe_inv = 0 pwrdwn difc dift figure 2. pwrdwn assertion diagram, oe_inv = 1 difc dift tstable <1 ms pwrdwn tdrive_pwrdwn# <300 s, >200 mv figure 3. pwrdwn deassertion diagram, oe_inv = 0
cy28800 document #: 38-07723 rev *b page 7 of 16 src_stp clarification the src_stp signal is an asynchronous input used for clean stopping and starting the dift/c outputs. this input can be active high or active low based on the strapped value of the oe_inv input. the src_stp signal is a debounced signal in that its state must remain unchanged during two consecutive rising edges of difc to be recognized as a valid assertion or deassertion. (the assertion and deassertion of this signal is absolutely asynchronous.) in the case where the output is disabled via oe control, the output will always be tri-stated regardless of the src_stp drive mode register bit state. notes: 1. disabling of the srct_in input clock prior to assertion of pwrdwn is an undefined mode and not recommended. operation in this mode may result in glitches excessive frequency shifting. 2. the total power-up latency from power on to all outputs active is less than 1 ms (assuming a valid clock is present on src_in input). 3. lock output is a latched signal that is re set with the assertion of pwrdwn or when vdd<1.8v. 4. special care must be taken to ensure that no abnormal clock behavior occurs after the assertion pll lock (i.e., overshoot/und ershoot is allowed). 5. in pll mode, if power is valid and pwrdwn is deasserted but no input clocks are present on the src_in input, dif clocks will remain disabled. only after valid input clocks are detected, valid power , pwrdwn deasserted with the pll locked and stable, are the dif outputs enabled. 6. in the case where oe is asserted low, the output will always be three-stated regardless of src_stp drive mode register bit st ate. difc dift tstable <1 ms pwrdwn tdrive_pwrdwn# <300 s, >200 mv figure 4. pwrdwn deassertion diagram, oe_inv = 1 table 4. buffer power-up state machine state description 0 3.3v buffer power off 1 after 3.3v supply is detected to rise above 1.8v?2.0v, the buffer enters state 1 and initiates a 0.2-ms?0.3-ms delay 2 [5] buffer waits for pwrdwn deassertion (and a valid clock on the src_in input if in pll mode) 3 [2, 3, 4] outputs enabled for normal operation (pll lock to the src_in input is assured in pll mode) figure 5. buffer power-up state diagram [1] table 5. src_stp functionality [6] oe_inv src_stp dift difc 0 1 normal normal 0 0 iref * 6 or float low 1 1 iref * 6 or float low 1 0 normal normal
cy28800 document #: 38-07723 rev *b page 8 of 16 src_stp assertion the impact of asserting the src_stp pin is that all dif outputs that are set in the c ontrol registers to stoppable via assertion of src_stp are stopped after their next transition. when the control register src_stp three-state bit is programmed to ?0?, the final state of all stopped dift/c signals is dift clock = high and difc = low. there will be no change to the output drive current values , dift will be driven high with a current value equal 6 x iref, and difc will not be driven. when the control register src_stp three-state bit is programmed to ?1?, the final st ate of all stopped dif signals is low, both dift clock and difc cl ock outputs will not be driven. src_stp deassertion all differential outputs that were stopped will resume normal operation in a glitch-free manner. the maximum latency from the deassertion to active outputs is between 2-6 dift/c clock periods (2 clocks are shown) wi th all dift/c outputs resuming simultaneously. if the control register tri-state bit is programmed to ?1? (tri-state), then all stopped dift outputs will be driven high within 15 ns of src_stp deassertion to a voltage greater than 200 mv. difc (stoppable) dift (stoppable) difc(free running dift(free running pwrdwn 1 ms src_stp figure 6. src_stp = driven, pwrdwn = driven, oe_inv = 0 difc (stoppable) difc(free running dift(free running pwrdwn 1 ms src_stp dift (stoppable) figure 7. src_stp = tri-state, pwrdwn = driven, oe_inv = 0 difc(free running dift(free running dift (stoppable) difc (stoppable) pwrdwn 1 ms src_stp figure 8. src_stp = tri-state, pwrdwn = tri-state, oe_inv = 0
cy28800 document #: 38-07723 rev *b page 9 of 16 output enable clarification oe functionality allows for enabling and disabling individual outputs. oe_[7:0] are active high or active low inputs depending on the strapped va lue of the oe_inv input. disabling the outputs may be implemented in two ways, via writing a ?0? to smbus register bit corresponding to output of interest or by deasserting the oe input pin. in both methods, if smbus registered bit has been written low or the oe pin is deasserted or both, the output of interest will be tri-stated. (the assertion and deassertion of this signal is absolutely asynchronous.) difc (stoppable) dift (stoppable) difc(free running dift(free running pwrdwn 1 ms src_stp figure 9. src_stp = driven, pwrdwn = driven, oe_inv = 1 difc (stoppable) difc(free running dift(free running pwrdwn 1 ms src_stp dift (stoppable) figure 10. src_stp = tri-state, pwrdwn = driven, oe_inv = 1 difc(free running dift(free running dift (stoppable) difc (stoppable) pwrdwn 1 ms src_stp figure 11. src_stp = tri-state, pwrdwn = tri-state, oe_inv = 1 table 6. oe functionality oe_inv oe (pin) oe (smbus bit) dif[t/c] 0 0 0 tri-state 0 0 1 tri-state 0 1 0 tri-state 0 1 1 enabled 1 0 0 tri-state 1 0 1 enabled 1 1 0 tri-state 1 1 1 tri-state
cy28800 document #: 38-07723 rev *b page 10 of 16 oe assertion all differential outputs that were tri-stated will resume normal operation in a glitch-free manner. the maximum latency from the assertion to active outputs is between 2?6 dif clock periods. in addition, dift cl ocks will be driven high within 15 ns of oe assertion to a voltage greater than 200 mv. oe deassertion the impact of deasserting oe is that each corresponding output will transition from norma l operation to tri-state in a glitch-free manner . the maximum latency from the deassertion to tri-stated outputs is between two?six dif clock periods. lock signal clarification the lock output signal is intended to provide designers a signal indicating that pll lock has been achieved and valid clock are available. this can be helpful when cascading multiple buffers which each contribute a 1-ms start-up delay in addition to the start-up time of the clock source. upon receiving a valid clock on the src_in input (pwrdwn deasserted), the buffer will begin ramping the internal pll until lock is achieved and stable, the clock buffer will assert the lock pin high and enable dif output clocks. in other words, if power is valid and pwrdwn is deasserted but no input clocks are present on the src_in input, all dif clocks remain disabled. only after valid in put clocks are detected, valid power, pwrdwn deasserted with the pll locked and stable are lock to be asserted and the dif outputs enabled. the maximum start-up latency from valid clocks on src_in input to the assertion of lock (output clocks are valid) is to be less than 1 ms. once lock has been asserted high, it will remain high (regardless of the actual pll status) until power is removed or the pwrdwn pin has been asserted. src_div2# clarification the src_div2# input is used to configure the dif output mode to be equal to the src_in input frequency or half the input frequency in a glitch-free manner. the src_div2# function may be implemented in two ways, via writing a ?0? to smbus register bit or by asse rting the src_div2# input pin low. in both methods, if the smbus register bit has been written low or the src_div2# pin is lo w or both, all dif outputs will configured for divide by 2 operation. src_div2# assertion the impact of asserting the src_ div2# is that all dif outputs will transition cleanly in a g litch-free manner from normal operation (output frequency equal to input) to half the input frequency within 2?6 dif clock periods. src_div2# deassertion the impact of deasserting the src_div2# is that all dif outputs will transition cleanly in a glitch-free manner from divide by 2 mode to normal (output frequency is equal to the input frequency) operation with in two?six dif clock periods. pll/bypass# clarification the pll/bypass# input is used to select between bypass mode (no pll) and pll mode. in bypass mode, the input clock is passed directly to the output stage resulting in 50-ps additive jitter (50 ps + input jitter) on dif outputs. in the case of pll mode, the input clock is pass through a pll to reduce high-frequency jitter. the byp ass# mode may be selected in two ways?via writing a ?0? to smbus register bit or by asserting the pll/bypass# pin lo w. in both methods, if the smbus register bit has been written to ?0 ? or pll/bypass# pin is low or both, the device will be configure for bypass operation. high_bw# clarification the high_bw# input is used to set the pll bandwidth. this mode is intended to minimize pll peaking when two or more buffers are cascaded by staggering device bandwidths. the pll high bandwidth mode may be selected in two ways, via writing a ?0? to smbus register bit or by asserting the high_bw# pin is low or both, the device will be configured for high bandwidth operation.
cy28800 document #: 38-07723 rev *b page 11 of 16 absolute maximum conditions parameter description condition min. max. unit v dd core supply voltage ?0.5 4.6 v v dd_a analog supply voltage ?0.5 4.6 v v in input voltage relative to v ss ?0.5 v dd + 0.5 vdc t s temperature, storage non-functional ?65 +150 c t a temperature, operating ambient functional 0 70 c t j temperature, junc tion functional 150 c esd hbm esd protection (human body model ) mil-std-883, method 3015 2000 v ul-94 flammability rating at 1/8 in. v?0 msl moisture sensitivity level 1 dc electrical specifications parameter description condition min. max. unit vdd_a , vdd 3.3v operating voltage 3.3 5% 3.135 3.465 v v ili2c input low voltage sdata, sclk ? 1.0 v v ihi2c input high voltage sdata, sclk 2.2 ? v v il 3.3v input low voltage v ss ? 0.5 0.8 v v ih 3.3v input high voltage 2.0 v dd + 0.5 v v ol 3.3v output low voltage i ol = 1 ma ? 0.4 v v oh 3.3v output high voltage i oh = ?1 ma 2.4 ? v i il input low leakage current except internal pull-up resistors, 0 < v in < v dd ?5 a i ih input high leakage current except internal pull-down resistors, 0 < v in < v dd 5 a c in input pin capacitance 1.5 5 pf c out output pin capacitance ?- 6 pf l in pin inductance ? 7 nh i dd3.3v dynamic supply current at max. l oad, full active bypass mode ? 175 ma at max. load, full active pll mode ? 200 ma all oe deasserted, bypass ? 35 ma src_stp asserted, outputs driven, bypass ? 150 ma src_stp asserted, outputs tri-state, bypass ? 2 ma src_stp asserted, outputs driven, pll ? 160 ma src_stp asserted, outputs tri-state, pll ? 2 ma i pd3.3v power-down supply current pwrdwn asserted, outputs driven ? 65 ma pwrdwn asserted, outputs tri-stated ? 5 ma ac electrical specifications (measured in high bandwidth mode) parameter description condition min. max. unit src_in at 0.7v t period average period measured at crossing point v ox 9.9970 10.0533 ns t absmin-in absolute minimum clock periods measured at crossing point v ox 9.8720 ns t r / t f dift and difc rise and fall times single ended measurement: v ol = 0.175 to v oh = 0.525v (averaged) 0.6 4 v/ns v ih differential input high voltage 150 mv v il differential input low voltage ?150 mv v ox crossing point voltage at 0.7v swing measured se 250 550 mv
cy28800 document #: 38-07723 rev *b page 12 of 16 ? v ox vcross variation over all edges measured se 140 mv v rb differential ringback voltage ?100 100 mv t stable time before ringback allowed 500 ps v max absolute maximum input voltage 1.15 v v min absolute minimum input voltage ?0.3 v t dc dift and difc duty cycle mea sured at crossing point v ox 45 55 % t rfm rise/fall matching determined as a fraction of 2 * (t r ? t f )/(t r + t f ) ?20% dif at 0.7v f in input frequency bypass or pll 1:1 90 210 mhz f error input/output frequency error bypass or pll 1:1 ? 0 ppm t dc dift and difc duty cycle mea sured at crossing point v ox 45 55 % t period average period measured at crossing point v ox at 100 mhz 9.9970 10.0533 ns t r / t f dift and difc rise and fall times single ended measurement: v ol = 0.175 to v oh = 0.525v (averaged) 175 700 ps t rfm rise/fall matching determined as a fraction of 2 * (t r ? t f )/(t r + t f ) ?20% ? t r / ? t f rise and fall time variation variation single ended measurement: v ol = 0.175 to v oh = 0.525v (real time) ? 125 ps v high voltage high measured se 660 850 mv v low voltage low measured se ?150 ? mv v ox crossing point voltage at 0.7v swing measured se 250 550 mv ? v ox vcross variation over all edges measured se ? 140 mv v ovs maximum overshoot voltage measured se ? v high + 0.3 v v uds minimum undershoot voltage measured se ? ?0.3 v v rb ring back voltage measured se 0.2 n/a v t ccj cycle to cycle jitter pll mode ? 50 ps bypass mode (jitter is additive) ? 50 ps t skew any dift/c to dift/c clock skew measured at crossing point v ox ?50ps t pd input to output skew in pll mode measured at crossing point v ox ? 250 ps input to output skew in non-pll mode measured at crossing point v ox 2.5 4.5 ns ac electrical specifications (continued)(measured in high bandwidth mode) parameter description condition min. max. unit dift t pcb t pcb difc 33 ? 33 ? 49.9 ? 49.9 ? measurem ent point 2 pf 475 ? ir e f measurem ent point 2 pf trace im pedance measured differentially figure 12. differential clock termination
cy28800 document #: 38-07723 rev *b page 13 of 16 switching waveforms figure 13. single-ended measurement points for trise and tfall v oh = 0.525v trise (clock) tfall (clock) c l o c k # v ol = 0.175v vcross c l o c k v ovs v rb v low v uds v rb figure 14. single-ended measurement points for v ovs ,v uds and v rb
cy28800 document #: 38-07723 rev *b page 14 of 16 0.000v t period high duty cycle % low duty cycle % skew management point figure 15. differential (clock-clock#) measurement points (tperiod, duty cycle and jitter) ordering information ordering code package type operating range lead free cy28800oxc 48-pin ssop commercial, 0c to 70 c CY28800OXCT 48-pin ssop?tape and reel commercial, 0c to 70 c
cy28800 document #: 38-07723 rev *b page 15 of 16 ? cypress semiconductor corporation, 2005. 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. all product and company names ment ioned in this document are trademarks of their respective holders. package drawing and dimensions 48-leadshrunksmalloutlinepackageo48 51-85061-*c
cy28800 document #: 38-07723 rev *b page 16 of 16 document history page document title: cy28800 100-mhz differential buffer for pci express and sata document number: 38-07723 rev. ecn no. issue date orig. of change description of change ** 299711 see ecn rgl new data sheet *a 404280 see ecn rgl idd 3.3v dynamic supply current: at max. load, full active bypass mode ? 175 ma at max. load, full active pll mode ? 200 ma all oe deasserted, bypass ? 35 ma *b 465413 see ecn rgl minor change: to post on web

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