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eproclock ? generator for intel calpella chipset SL28748 doc#: sp-ap-0017 (rev. aa) page 1 of 19 400 west cesar chavez, austin, tx 78701 1+( 512) 416-8500 1+(512) 416-9669 www.silabs.com features ? intel ck505 clock revision 1.0 compliant ? hybrid video support - simultaneous dot96, 27mhz_ss and 27mhz_ nss video clocks ? pci-express gen 2 compliant ? low power push-pull type differential output buffers ? integrated voltage regulator ? integrated resistors on differential clocks ? scalable low voltage vdd_io (3.3v to 1.05v) ? wireless friendly 3-bits slew rate control on single-ended clocks. ? differential cpu clocks with selectable frequency ? 100mhz different ial src clocks ? 100mhz different ial sata clocks ? 96mhz differential dot clock ? 27mhz video clock ? buffered reference clock 14.318mhz ? 14.318mhz crystal input or clock input ? eproclock ? programmable technology ?i 2 c support with readback capabilities ? triangular spread spectrum profile for maximum electromagnetic interference (emi) reduction ? industrial temperature -40 o c to 85 o c ? 3.3v power supply ? 32-pin qfn package cpu src sata dot96 ref 27m x2 x1 x 1 x 1 x1 x2 block diagram pin configuration ** internal 100k-ohm pull-down resistor sclk sdata ref0/ fs** vdd_ref xtal_in xtal_out vss_ref ckpwrgd/ pd# 32 31 30 29 28 27 26 25 vdd_dot 124 vdd_cpu vss_dot 223 cpu0 dot96 322 cpu#0 dot96# 421 vss_cpu vdd_27 520 cpu1 27_nss 619 cpu#1 27_ss 718 vdd_cpu_io vss_27 817 vdd_src 9 10111213141516 vss_sata src0 / sata src0# / sata# vss_src src1 src1# vdd_src_io cpu_stp#
SL28748 doc#: sp-ap-0017 (rev. aa) page 2 of 19 32-qfn pin definitions pin no. name type description 1 vdd_dot pwr 3.3v power supply for outputs and pll 2 vss_dot gnd ground for outputs 3 dot96 o, dif fixed true 96mhz clock output 4 dot96# o, dif fixed complement 96mhz clock output 5 vdd_27 pwr 3.3v power supply for 27mhz pll 6 27m_nss o,se non-spread 27mhz video clock output 7 27m_ss o, se spread 27mhz video clock output 8 vss_27 gnd ground for 27mhz pll 9 vss_sata gnd ground for outputs 10 src0 / sata o, dif 100mhz true differential serial reference clock 11 src0# / sata# o, dif 100mhz complement differential serial reference clock 12 vss_src gnd ground for pll 13 src1 o, dif 100mhz true differential serial reference clock 14 src1# o, dif 100mhz complement differential serial reference clock 15 vdd_src_io pwr scalable 3.3v to 1.05v power supply for output buffer 16 cpu_stp# i 3.3v tolerance input to stop the cpu clock 17 vdd_src pwr 3.3v power supply for pll 18 vdd_cpu_io pwr scalable 3.3v to 1.05v power supply for output buffer 19 cpu1# o, dif complement diff erential cpu clock output 20 cpu1 o, dif true differential cpu clock output 21 vss_cpu gnd ground for pll 22 cpu0# o, dif complement diff erential cpu clock output 23 cpu0 o, dif true differential cpu clock output 24 vdd_cpu pwr 3.3v power supply for cpu pll 25 ckpwrgd/pd# i 3.3v lvttl input. this pin is a level sensitive strobe used to latch the fs. after ckpwrgd (active high) assertion, this pin becomes a real-time input for asserting power down (active low) 26 vss_ref gnd ground for outputs 27 xout o, se 14.318mhz crystal output 28 xin i 14.318mhz crystal input 29 vdd_ref pwr 3.3v power supply for outputs and also maintains smbus registers during power-down 30 ref/fs** pd, i/o 3.3v tolerant input for graphi c clock selection/fixed 14.318mhz clock output. ( internal 100k-ohm pull-down resistor on fs pin ) refer to dc electrical specifications t able for vil_fs and vih_fs specifications 31 sdata i/o smbus compatible sdata 32 sclk i smbus compatible sclock
SL28748 doc#: sp-ap-0017 (rev. aa) page 3 of 19 eproclock ? programmable technology eproclock ? is the world?s first non-volatile programmable clock. the eproclock ? technology allows board designer to promptly achieve optimum compliance and clock signal integrity; historically, attainable typically through device and/or board redesigns. eproclock ? technology can be configured through smbus or hard coded. features: - > 4000 bits of configurations - can be configured through smbus or hard coded - custom frequency sets - differential skew control on true or compliment or both - differential duty cycle control on true or compliment or both - differential amplitude control - differential and single-ended slew rate control - program internal or external series resistor on single-ended clocks - program different spread profiles - program different spread modulation rate frequency select pin fs apply the appropriate logic levels to fs inputs before ckpwrgd assertion to achieve host clock frequency selection. when the clock ch ip sampled high on ckpwrgd and indicates that vtt voltage is stable then fs input values are sampled. this process empl oys a one-shot functionality and once the ckpwrgd sampled a valid high, all other fs, and ckpwrgd transitions are ignored except in test mode. serial data interface to enhance the flexibility and functi on of the clock synthesizer, a two-signal serial interface is provided. through the serial data interface, various device functions, such as individual clock output buffers are individually enabled or disabled. the registers associated with the serial data interface initialize to their default setting at power-up. the use of this interface is optional. clock device register changes are normally made at system initialization, if any ar e required. the interface cannot be used during system operation for power management functions. data protocol the clock driver serial protocol accepts byte write, byte read, block write, and block read opera tions from the controller. for block write/read operation, access the bytes in sequential order from lowest to highest (most significant bit first) with the ability to stop after any complete byte is transferred. for byte write and byte read operations, the system controller can access individually indexed bytes. the offset of the indexed byte is encoded in the command code described in ta ble 1 . the block write and block read protocol is outlined in table 2 while table 3 outlines byte write and byte read protocol. the slave receiver address is 11010010 (d2h). . frequency select pin (fs) fs cpu power on src sata dot96 27mhz ref 0 133mhz default 100mhz 100mhz 96mhz 27mhz 14.318mhz 1 100mhz 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 wr ite operation. for block read or block writ e operations, these bits should be '0000000 ' table 2. block read and block write protocol block write protocol block read protocol bit description bit description 1start 1start 8:2 slave address?7 bits 8:2 slave address?7 bits 9 write 9 write 10 acknowledge from slave 10 acknowledge from slave 18:11 command code?8 bits 18:11 command code?8 bits 19 acknowledge from slave 19 acknowledge from slave 27:20 byte count?8 bits 20 repeat start 28 acknowledge from slave 27:21 slave address?7 bits
SL28748 doc#: sp-ap-0017 (rev. aa) page 4 of 19 36:29 data byte 1?8 bits 28 read = 1 37 acknowledge from slave 29 acknowledge from slave 45:38 data byte 2?8 bits 37:30 byte count from slave?8 bits 46 acknowledge from slave 38 acknowledge .... data byte /slave acknowledges 46:39 data byte 1 from slave?8 bits .... data byte n?8 bits 47 acknowledge .... acknowledge from slave 55:48 data byte 2 from slave?8 bits .... stop 56 acknowledge .... data bytes from slave / acknowledge .... data byte n from slave?8 bits .... not acknowledge .... stop table 3. byte read and byte write protocol byte write protocol byte read protocol bit description bit description 1start 1start 8:2 slave address?7 bits 8:2 slave address?7 bits 9write 9write 10 acknowledge from slave 10 acknowledge from slave 18:11 command code?8 bits 18:11 command code?8 bits 19 acknowledge from slave 19 acknowledge from slave 27:20 data byte?8 bits 20 repeated start 28 acknowledge from slave 27:21 slave address?7 bits 29 stop 28 read 29 acknowledge from slave 37:30 data from slave?8 bits 38 not acknowledge 39 stop table 2. block read and block write protocol (continued) block write protocol block read protocol bit description bit description
SL28748 doc#: sp-ap-0017 (rev. aa) page 5 of 19 control registers byte 0: control register 0 bit @pup name description 7 hw fs cpu frequency select bit, set by hw 0 = 133mhz, 1= 100mhz 6 0 reserved reserved 5 1 reserved reserved 4 0 iamt_en iamt enable 0 = legacy mode, 1 = iamt enabled 3 0 reserved reserved 2 0 src_main_sel select source for src clock 0 = src_main = pll1, pll3_cfg table applies 1 = src_main = pll3, pll3_cfg table does not apply 1 0 sata_sel select source of sata clock 0 = sata = src_main, 1= sata = pll4 0 1 pd_restore save configuration when pd# is asserted 0 = config. cleared, 1 = config. saved byte 1: control register 1 bit @pup name description 7 1 reserved reserved 6 0 pll1_ss_dc select for down or center ss 0 = down spread, 1 = center spread 5 0 pll3_ss_dc select for down or center ss 0 = down spread, 1 = center spread 4 0 pll3_cfb3 cfb bit [4:1] only applies when src_main_sel = 0 (byte 0, bit 2 =0) see table 4 on page 9 for configuration. 3 0 pll3_cfb2 2 1 pll3_cfb1 1 0 pll3_cfb0 0 1 reserved reserved byte 2: control register 2 bit @pup name description 7 1 ref_oe output enable for ref 0 = output disabled, 1 = output enabled 6 1 reserved reserved 5 1 reserved reserved 4 1 reserved reserved 3 1 reserved reserved 2 1 reserved reserved 1 1 reserved reserved 0 1 reserved reserved byte 3: control register 3 bit @pup name description 7 1 reserved reserved 6 1 reserved reserved 5 1 reserved reserved
SL28748 doc#: sp-ap-0017 (rev. aa) page 6 of 19 4 1 reserved reserved 3 1 reserved reserved 2 1 reserved reserved 1 1 reserved reserved 0 1 reserved reserved byte 3: control register 3 byte 4: control register 4 bit @pup name description 7 1 reserved reserved 6 1 sata_oe output enable for sata 0 = output disabled, 1 = output enabled 5 1 src_oe output enable for src 0 = output disabled, 1 = output enabled 4 1 dot96_oe output enable for dot96 0 = output disabled, 1 = output enabled 3 1 cpu1_oe output enable for cpu1 0 = output disabled, 1 = output enabled 2 1 cpu0_oe output enable for cpu0 0 = output disabled, 1 = output enabled 1 1 pll1_ss_en enable pll1s spread modulation, 0 = spread disabled, 1 = spread enabled 0 1 pll3_ss_en enable pll3s spread modulation 0 = spread disabled, 1 = spread enabled byte 5: control register 5 bit @pup name description 7 0 reserved reserved 6 0 reserved reserved 5 0 reserved reserved 4 0 reserved reserved 3 0 reserved reserved 2 0 reserved reserved 1 0 reserved reserved 0 0 reserved reserved byte 6: control register 6 bit @pup name description 7 0 reserved reserved 6 0 reserved reserved 5 0 ref bit1 ref slew rate control (see byte 13 for slew rate bit 0 and bit 2) 0 = high, 1 = low 4 0 reserved reserved 3 0 27mhz bit 1 27mhz slew rate control (see byte 13 for slew rate bit 0 and bit 2) 0 = high, 1 = low 2 0 reserved reserved 1 0 reserved reserved 0 0 reserved reserved
SL28748 doc#: sp-ap-0017 (rev. aa) page 7 of 19 byte 7: vendor id bit @pup name description 7 0 rev code bit 3 revision code bit 3 6 1 rev code bit 2 revision code bit 2 5 0 rev code bit 1 revision code bit 1 4 0 rev code bit 0 revision code bit 0 3 1 vendor id bit 3 vendor id bit 3 2 0 vendor id bit 2 vendor id bit 2 1 0 vendor id bit 1 vendor id bit 1 0 0 vendor id bit 0 vendor id bit 0 byte 8: control register 8 bit @pup name description 7 1 device_id3 reserved 6 0 device_id2 reserved 5 0 device_id1 reserved 4 0 device_id0 reserved 3 0 reserved reserved 2 0 reserved reserved 1 1 27m_non-ss_oe output enable for 27m_non-ss 0 = output disabled, 1 = output enabled 0 1 27m_ss_oe output enable for 27m_ss 0 = output disabled, 1 = output enabled byte 9: control register 9 bit @pup name description 7 0 reserved reserved 6 0 reserved reserved 5 1 reserved reserved 4 0 test _mode_sel test mode select either ref/n or tri-state 0 = all outputs tri-state, 1 = all output ref/n 3 0 test_mode_entry allows entry into test mode 0 = normal operation, 1 = enter test mode(s) 2 1 i2c_vout<2> amplitude confi gurations differential clocks i2c_vout[2:0] 000 = 0.30v 001 = 0.40v 010 = 0.50v 011 = 0.60v 100 = 0.70v 101 = 0.80v (default) 110 = 0.90v 111 = 1.00v 1 0 i2c_vout<1> 0 1 i2c_vout<0> byte 10: control register 10 bit @pup name description 7 0 reserved reserved 6 0 reserved reserved 5 0 reserved reserved
SL28748 doc#: sp-ap-0017 (rev. aa) page 8 of 19 byte 13: control register 13 4 0 reserved reserved 3 0 reserved reserved 2 0 reserved reserved 1 1 cpu1_stp_ctrl enable cpu_stp# control of cpu1 0 = free running, 1= stoppable 0 1 cpu0_stp_ctrl enable cpu_stp# control of cpu0 0 = free running, 1= stoppable byte 10: control register 10 (continued) bit @pup name description byte 11: control register 11 bit @pup name description 7 0 reserved reserved 6 0 reserved reserved 5 0 reserved reserved 4 0 reserved reserved 3 0 reserved reserved 2 1 cpu1_iamt_en cpu1 iamt clock enabled 0 = disabled, 1 = enabled 1 1 pci-e_gen2 pci-e_gen2 compliant 0 = non gen2, 1= gen2 compliant 0 1 reserved reserved byte 12: byte count bit @pup name description 7 0 bc7 byte count register for block read operation. the default value for byte count is 15. in order to read beyond byte 15, the user should change the byte count limit.to or beyond the byte that is desired to be read. 60 bc6 50 bc5 40 bc4 31 bc3 21 bc2 11 bc1 01 bc0 bit @pup name description 7 1 ref_bit2 drive strength control - bit[2:0], note: see byte 6 bit 5 for ref slew rate bit 1 and byte 6 bit 3 for 27mhz slew rate bit 1 normal mode default ?101? wireless friendly mode default to ?111? 61 ref_bit0 5 1 27mhz_nss_bit2 4 1 27mhz_nss_bit0 3 1 27mhz_ss_bit2 2 1 27mhz_ss_bit0
SL28748 doc#: sp-ap-0017 (rev. aa) page 9 of 19 byte 14: control register 14 table 4. pin 6 and 7 configuration table . . 1 0 reserved reserved 0 0 wireless friendly mode wireless friendly mode 0 = disabled, default all single-ended clocks slew rate config bits to ?101? 1 = enabled, default all single-ended clocks slew rate config bits to ?111? bit @pup name description 7 1 reserved reserved 6 0 reserved reserved 5 1 reserved reserved 40 otp_4 otp_id identification for programmed device 30 otp_3 20 otp_2 10 otp_1 00 otp_0 b1b4 b1b3 b1b2 b1b1 pin7 pin 8 spread (%) 0000 n/a n/an/a 0001 n/a n/an/a 0 0 1 0 27m_nss 27m_ss -0.5% 0 0 1 1 27m_nss 27m_ss -1% 0 1 0 0 27m_nss 27m_ss -1.5% 0 1 0 1 27m_nss 27m_ss -2% 0 1 1 0 27m_nss 27m_ss -0.75v 0 1 1 1 27m_nss 27m_ss -1.25% 1 0 0 0 27m_nss 27m_ss -1.75% 1 0 0 1 27m_nss 27m_ss +/-0.5% 1 0 1 0 27m_nss 27m_ss +/-0.75% 1011 n/a n/an/a 1100 n/a n/an/a 1101 n/a n/an/a 1110 n/a n/an/a 1111 n/a n/an/a table 5. output driver status during cpu_stp# cpu_stp# asserted smbus oe disabled single-ended clocks stoppable running driven low non stoppable running differential clocks stoppable clock driven high clock driven low clock# driven low non stoppable running
SL28748 doc#: sp-ap-0017 (rev. aa) page 10 of 19 pd# (power down) clarification the ckpwrgd/pd# pin is a dual-function pin. during initial power up, the pin functions as ckpwrgd. once ckpwrgd has been sampled high by the clock chip, the pin assumes pd# functionality. the pd# pin is an asynchronous active low input used to s hut off all clocks cle anly before shutting off power to the device. this signal is synchronized internally to the device before powering down the clock synthesizer. pd# is also an asynchronous input for powering up the system. when pd# is asserted low, clocks are driven to a low value and held before turning off the vcos and the crystal oscillator. pd# (power down) assertion when pd# is sampled low by two consecutive rising edges of cpu clocks, all single-ended outputs will be held low on their next high-to-low transition and differential clocks must held low. when pd# mode is desired as the initial power on state, pd# must be asse rted low in less than 10 ? s after asserting ckpwrgd. pd# deassertion the power up latency is less than 1.8 ms. this is the time from the deassertion of the pd# pin or the ramping of the power supply until the time that stabl e clocks are generated from the clock chip. all differential outputs stopped in a three-state condition, resulting from are driven high in less than 300 ? s of pd# deassertion to a voltage greater than 200 mv. after the clock chip?s internal pll is powered up and locked, all outputs are enabled within a few clock cycles of each clock. figure 2 is an example showi ng the relationship of clocks coming up. table 6. output driver status all single-ended clocks all differential clocks w/o strap w/ strap clock clock# pd# = 0 (power down) low hi-z low low figure 1. power down assertion timing waveform figure 2. power down de assertion timing waveform
SL28748 doc#: sp-ap-0017 (rev. aa) page 11 of 19 cpu_stp# assertion the cpu_stp# signal is an active low input used for synchronous stopping and starting the cpu output clocks while the rest of the clock g enerator continues to function. when the cpu_stp# pin is asserted, all cpu outputs that are set with the smbus configuration to be stoppable are stopped within two to six cpu clock periods after sampled by two rising edges of the internal cpuc clock. the final states of the stopped cpu signals are cput = high and cpuc = low. cpu_stp# deassertion the deassertion of the cpu_stp# signal causes all stopped cpu outputs to resume normal operation in a synchronous manner. no short or stretched clock pulses are produced when the clock resumes. the ma ximum latency from the deassertion to active outputs is no more than two cpu clock cycles. figure 3. ckpwrgd timing diagram cpu_stp# cput cpuc figure 4. cpu_stp# assertion waveform cpu_stp# cput cpuc cput internal tdrive_cpu_stp#,10 ns>200 mv cpuc internal figure 5. cpu_stp# deassertion waveform
SL28748 doc#: sp-ap-0017 (rev. aa) page 12 of 19 absolute maximum conditions parameter description condition min. max. unit v dd_3.3v main supply voltage functional ? 4.6 v v dd_io io supply voltage functional 4.6 v v in input voltage relative to v ss ?0.5 4.6 v dc t s temperature, storage non-functional ?65 150 c t a temperature, operating ambient (commercial) functional 0 85 c t a temperature, operating ambient (industrial) functional -40 85 c t j temperature, junction functional ? 150 c ? jc dissipation, junction to case functional ? 20 c/ w ? ja dissipation, junction to ambient jedec (jesd 51) ? 60 c/ w esd hbm esd protection (human body model) jedec (jesd 51) 2000 ? v ul-94 flammability rating jedec (jesd 22 - a114) v?0 msl moisture sensitivity level ul (class) 1 multiple supplies: the voltage on any input or i/o pin cannot exceed the power pin during power-up. power supply sequencing is not required. dc electrical specifications parameter description condition min. max. unit vdd core 3.3v operating voltage 3.3 5% 3.135 3.465 v v ih 3.3v input high voltage (se) 2.0 v dd + 0.3 v v il 3.3v input low voltage (se) v ss ? 0.3 0.8 v v ihi2c input high voltage sdata, sclk 2.2 ? v v ili2c input low voltage sdata, sclk ? 1.0 v v ih_fs fs input high voltage 0.7 vdd+0.3 v v il_fs fs input low voltage v ss ? 0.3 0.35 v i ih input high leakage current except internal pull-down resistors, 0 < v in < v dd ?5 ? a i il input low leakage current except internal pull-up resistors, 0 < v in < v dd ?5 ? ? a v oh 3.3v output high voltage (se) i oh = ?1 ma 2.4 ? v v ol 3.3v output low voltage (se) i ol = 1 ma ? 0.4 v v dd io low voltage io supply voltage 1 3.465 v i oz high-impedance output current ?10 10 ? a c in input pin capacitance 1.5 5 pf c out output pin capacitance 6pf l in pin inductance ? 7 nh v xih xin high voltage 0.7v dd v dd v v xil xin low voltage 0 0.3v dd v idd_ pd power down current ? 1 ma i dd_3.3v dynamic supply current all outputs enabled. se clocks with 8? traces. differential clocks with 7? traces. loading per ck505 spec. ?65ma i dd_vdd_io dynamic supply current all outputs enabled. se clocks with 8? traces. differential clocks with 7? traces. loading per ck505 spec. ?25ma
SL28748 doc#: sp-ap-0017 (rev. aa) page 13 of 19 ac electrical specifications parameter description condition min. max. unit crystal t dc xin duty cycle the device will operate reliably with input duty cycles up to 30/70 but the ref clock duty cycle will not be within specification 47.5 52.5 % t period xin period when xin is dr iven from an external clock source 69.841 71.0 ns t r /t f xin rise and fall times measured between 0.3v dd and 0.7v dd ?10.0ns t ccj xin cycle to cycle jitter as an average over 1- ? s duration ? 500 ps l acc long-term accuracy measured at vdd/2 differential ? 250 ppm clock input t dc clkin duty cycle measured at vdd/2 47 53 % t r /t f clkin rise and fall times measured between 0.2v dd and 0.8v dd 0.5 4.0 v/ns t ccj clkin cycle to cycle jitter measured at vdd/2 ? 250 ps t ltj clkin long term jitter measured at vdd/2 ? 350 ps v il input low voltage xin / clkin pin ? 0.8 v v ih input high voltage xin / clkin pin 2 vdd+0.3 v i il input lowcurrent xin / clkin pin, 0 < vin <0.8 ? 20 ua i ih input highcurrent xin / clkin pin, vin = vdd ? 35 ua cpu at 0.7v t dc cput and cpuc duty cycle measured at 0v differential 45 55 % t period 100 mhz cput and cpuc period measur ed at 0v differential at 0.1s 9.99900 10.00100 ns t period 133 mhz cput and cpuc period measur ed at 0v differential at 0.1s 7.49925 7.50075 ns t periodss 100 mhz cput and cpuc period, ssc me asured at 0v di fferential at 0.1s 10.02406 10.02607 ns t periodss 133 mhz cput and cpuc period, ssc me asured at 0v di fferential at 0.1s 7.51804 7.51955 ns t periodabs 100 mhz cput and cpuc absolute period measured at 0v differential at 1 clock 9.91400 10.0860 ns t periodabs 133 mhz cput and cpuc absolute period measured at 0v differential at 1 clock 7.41425 7.58575 ns t periodssabs 100 mhz cput and cpuc absolute period, ssc measured at 0v differential at1 clock 9.914063 10.1362 ns t periodssabs 133 mhz cput and cpuc absolute period, ssc measured at 0v differential at1 clock 7.41430 7.62340 ns t ccj cpu cycle to cycle jitter measured at 0v differential ? 85 ps skew cpu0 to cpu1 skew measured at 0v differential ? 100 ps l acc long-term accuracy measured at 0v differential ? 100 ppm t r / t f cpu rising/falling slew rate measured differentially from 150 mv 2.5 8 v/ns t rfm rise/fall matching measured single-endedly from 75 mv ? 20 % v high voltage high 1.15 v v low voltage low ?0.3 ? v v ox crossing point voltage at 0.7v swing 300 550 mv src at 0.7v t dc src duty cycle measured at 0v differential 45 55 % t period 100 mhz src period measured at 0v differential at 0.1s 9.99900 10.0010 ns t periodss 100 mhz src period, ssc measured at 0v differential at 0.1s 10.02406 10.02607 ns t periodabs 100 mhz src absolute period measured at 0v differential at 1 clock 9.87400 10.1260 ns t periodssabs 100 mhz src absolute period, ssc meas ured at 0v differential at 1 clock 9.87406 10.1762 ns
SL28748 doc#: sp-ap-0017 (rev. aa) page 14 of 19 t skew(window) any src clock skew from the earliest bank to the latest bank measured at 0v differential ? 3.0 ns t ccj src cycle to cycle jitter measured at 0v differential ? 125 ps rms gen1 output pcie* gen1 refclk phase jitter ber = 1e-12 (including pll bw 8 - 16 mhz, = 0.54, td=10 ns, ftrk=1.5 mhz) 0108ps rms gen2 output pcie* gen2 refclk phase jitter includes pll bw 8 - 16 mhz, jitter peaking = 3db, = 0.54, td=10 ns), low band, f < 1.5mhz 03.0ps rms gen2 output pcie* gen2 refclk phase jitter includes pll bw 8 - 16 mhz, jitter peaking = 3db, = 0.54, td=10 ns), low band, f < 1.5mhz 03.1ps l acc src long term accuracy measured at 0v differential ? 100 ppm t r / t f src rising/falling slew rate measured differentially from 150 mv 2.5 8 v/ns t rfm rise/fall matching measured single-endedly from 75 mv ? 20 % v high voltage high 1.15 v v low voltage low ?0.3 ? v v ox crossing point voltage at 0.7v swing 300 550 mv dot96 at 0.7v t dc dot96 duty cycle measured at 0v differential 45 55 % t period dot96 period measured at 0v differential at 0.1s 10.4156 10.4177 ns t periodabs dot96 absolute period measured at 0v differential at 0.1s 10.1656 10.6677 ns t ccj dot96 cycle to cycle jitter measured at 0v differential at 1 clock ? 250 ps l acc dot96 long term accuracy measured at 0v differential at 1 clock ? 100 ppm t r / t f dot96 rising/falling slew rate measured differentially from 150 mv 2.5 8 v/ns t rfm rise/fall matching measured single-endedly from 75 mv ? 20 % v high voltage high 1.15 v v low voltage low ?0.3 ? v v ox crossing point voltage at 0.7v swing 300 550 mv 27m_nss/27_ss at 3.3v t dc duty cycle measurement at 1.5v 45 55 % t period spread 27m period measurem ent at 1.5v 37.03594 37.03813 ns spread enabled 27m period measur ement at 1.5v 37.12986 37.13172 ns t r / t f rising and falling edge rate measured between 0.8v and 2.0v 1.0 4.0 v/ns t ccj cycle to cycle jitter measurement at 1.5v ? 300 ps l acc 27_m long term accuracy measured at crossing point v ox ?50ppm ref t dc ref duty cycle measurement at 1.5v 45 55 % t period ref period measurement at 1.5v 69.82033 69.86224 ns t periodabs ref absolute period measurement at 1.5v 68.83429 70.84826 ns t high ref high time measurement at 2v 29.97543 38.46654 ns t low ref low time measurement at 0.8v 29.57543 38.26654 ns t r / t f ref rising and falling edge rate measured between 0.8v and 2.0v 1.0 4.0 v/ns ac electrical specifications (continued) parameter description condition min. max. unit
SL28748 doc#: sp-ap-0017 (rev. aa) page 15 of 19 t ccj ref cycle to cycle jitter measurement at 1.5v ? 1000 ps l acc long term accuracy measurement at 1.5v ? 100 ppm enable/disable and set-up t stable clock stabilization from power-up ? 1.8 ms t ss stopclock set-up time 10.0 ? ns ac electrical specifications (continued) parameter description condition min. max. unit
SL28748 doc#: sp-ap-0017 (rev. aa) page 16 of 19 test and measurement set-up for reference clock the following diagram shows the test load configurations for the single-ended ref output signal. for differential clock signals this diagram shows the test load configur ation for the differential clock signals figure 6. single-ended ref triple load configuration figure 7. single-ended output signals (for ac parameters measurement) figure 8. 0.7v differential load configuration
SL28748 doc#: sp-ap-0017 (rev. aa) page 17 of 19 figure 9. differential measurement for differentia l output signals (for ac parameters measurement) figure 10. single-ended measurement for differenti al output signals (for ac parameters measurement)
SL28748 doc#: sp-ap-0017 (rev. aa) page 18 of 19 ordering information part number package type product flow lead-free SL28748elc 32-pin qfn commercial, 0 ? to 85 ? c SL28748elct 32-pin qfn?tape and reel commercial, 0 ? to 85 ? c SL28748eli 32-pin qfn industrial, -40 ? to 85 ? c SL28748elit 32-pin qfn?tape and reel industrial, -40 ? to 85 ? c this device is pb free and rohs compliant. package diagrams 32-lead qfn 5x 5mm (saw version) sl 28 748 el c - t temperature designator package designator l : qfn revision number a = 1 st silicon generic part number designated family number company initials packaging designator for tape and reel
SL28748 doc#: sp-ap-0017 (rev. aa) page 19 of 19 document history page the information in this document is believed to be accurate in all respects at the time of publ ication but is subject to change without notice. silicon laboratories assumes no responsibility for errors and omissions, an d disclaims responsibility for any consequences resulting fr om the use of information included herein. additionally, silicon laboratories as sumes no responsibility for the functioning of undescribed fe atures or param- eters. silicon laboratories reserves the right to make changes without further notice. silicon laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any par ticular purpose, nor does silicon laboratories assume any liabil ity arising out of the application or use of any product or circ uit, and specifically disclaims any and all liability , including without limitation co nsequential or incidental damages. silicon laboratories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the silicon laboratories product could create a situation where personal inju ry or death may occur. should buyer purchase or use silicon labor atories products for any such unintended or unauthorized application, buyer shall ind emnify and hold silicon laboratories harmless against all claims and damages. document title: SL28748 pc eproclock ? generator for intel calpella chipset doc#: sp-ap-0017 (rev. aa) rev. ecr# issue date orig. of change description of change 1.0 10/09/08 jma initial release 1.1 10/23/08 jma 1. changed oper ating temperature to 0-85c 2. re-aligned ordering part number description 1.2 1/27/09 jma 1. updated rev. id 2. updated definition of byte 6 bit 5 and 3 3. updated byte 13 and single-ended slew rate table 4. updated byte 14 5. updated feature description 6. added less than symbol in power consumption value 7. updated ordering part number 8. changed package information 9. changed wireless friendly mode to 111 1.3 3/16/09 jma 1. added pc eproclock ? programmed technology in feature section 2. updated block diagram 3. updated 27mhz slew rate measurement window 4. updated power consumption 1.4 3/25/09 jma 1. updated package information removed punch version with saw version 2. updated period at 100mhz for cpu clocks 3. updated revision id 4. added power down spec 5. added pc eproclock ? technology description 6. added cpu skew 1.5 6/03/09 jma 1. updated revision id 2. removed 3-bit differential slew rate 3. removed 0.1s from cpu duty cycle spec 4. changed sata pll2 to pll4 5. updated idd meas urement condition 1.6 10/16/09 jma 1. removed the word ?preliminary? 2. added note in package diagram 3. updated text content 4. added information on trace length in figure 8 5. removed cpu driven figures 6. edited ck_pwrgd to ckpwrgd aa 1456 05/18/10 jma 1. updated mil-std to jedec standard 2. updated vdd_io spec to 4.6v maximum value 3. combined commercial and industrial 4. changed revision to be iso compliant 5. removed refernce to application note#25. 6. added feature for clock input 7. removed skew data on ref clock

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