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RTM875N-397 ac performance measurement report measurement equipment : clock rise time / fall time are measur ed by tektronix? 6804b with single-ended probe - mainframe with 8.0ghz bandwidth - mainframe with 20gs/s sampling rate - p7240 active probe with 4.0ghz b andwidth (input: 1.0pf / 20k-ohm) clock jitter & duty cycle are measured by tektr onix? 6804b with differential probe - p7330 differential active probe with 3.5ghz bandwidth (input: 0.5pf / 100k-ohm) - tektronix? jitter analysis 3? jitter measurement software measurement environment : - test board measurement item : differential clock - slew_rise & slew_fall - vcross & vcross - cycle to cycle jitter - vmax & vmin - duty cycle single-end clock - slew_rise & slew_fall - duty cycle - cycle to cycle jitter - measurement summary from the measurement shown as follows, RTM875N-397 works good and meets all clk spec. measurement signal: 1. cpu0 clock 2. cpu1 clock 3. sata clock 4. pcie6 clock 5. pcie11 clock 6. dot96 clock 7. pci clock 8. usb clock 9. ref clock 10. phase jitter www.datasheet.co.kr datasheet pdf - http://www..net/
measurement condition #1 slew_rise & slew_fall of differential waveform : rise and fall slew rate are measur ed differential waveform between +150mv and -150mv on the rising and falling edges of the clock. (reference ck505 spec page.19 / 20) #2 vcross of differential waveform : absolute cross point= 0.3 ~0.55 v (reference ck505 spec page.19 / 20) #3 vcross of differential waveform : absolute vcross <140 mv (reference ck505 spec page.19 / 20) www.datasheet.co.kr datasheet pdf - http://www..net/
#4 cycle to cycle jitter : absolute cycle to cycle jitter <85 ps (reference ck505 spec page.19 / 20 & jedec jesd65-a page.13) #5 vmax & vmin : vmax < 1.15 v and vhigh > -0.3v. measure the vmax & vmin value by using te ktronix scope ?vmax ? & ?vmin? function. (reference ck505 page.18) #6 duty cycle : duty cycle specification is between 45 and 55%. (reference ck505 page.19) www.datasheet.co.kr datasheet pdf - http://www..net/
#7 slew_rise & slew_fa ll of single waveform: rise and fall slew rate are measured si ngle waveform between 0.8v and 2.0v on the rising and falling edges of the clock. (reference ck505 spec page.20~22) #8 duty cycle of single waveform : duty cycle specification is between 45 and 55%. (reference ck505 page.20~23) #4 cycle to cycle jitter : (reference ck505 spec page.20~ 23 & jedec jesd65-a page.13) www.datasheet.co.kr datasheet pdf - http://www..net/
1. cpu0 clock slew_rise slew_fall vcross v cross c-c jitter specification 2.5~8 v/ns see #1 2.5~8 v/ns see #1 300~550 mv see #3 v cross <140 mv see #3 < 85 ps see #2 measured result 3.519 v/ns 3.716 v/ns 392 ~ 428 mv 36 mv 42 ps vmax vmin duty cycle specification < 1.15v see #4 > -0.3v see #4 45%~55% see #2 measured result 0.890 v -0.023 v 50.81 % slew_rise & slew_fall cycle to cycle jitter & duty cycle vcross & vcross vmax & vmin www.datasheet.co.kr datasheet pdf - http://www..net/
2. cpu1 clock slew_rise slew_fall vcross v cross c-c jitter specification 2.5~8 v/ns see #1 2.5~8 v/ns see #1 300~550 mv see #3 v cross <140 mv see #3 < 85 ps see #2 measured result 3.535 v/ns 3.746 v/ns 395 ~ 431 mv 36 mv 44 ps vmax vmin duty cycle specification < 1.15v see #4 > -0.3v see #4 45%~55% see #2 measured result 0.897 v -0.047 v 51.07 % slew_rise & slew_fall cycle to cycle jitter & duty cycle vcross & vcross vmax & vmin www.datasheet.co.kr datasheet pdf - http://www..net/
3. sata clock slew_rise slew_fall vcross v cross c-c jitter specification 2.5~8 v/ns see #1 2.5~8 v/ns see #1 300~550 mv see #3 v cross <140 mv see #3 < 125 ps see #2 measured result 3.674 v/ns 3.822 v/ns 392~ 434 mv 42mv 45 ps vmax vmin duty cycle specification < 1.15v see #4 > -0.3v see #4 45%~55% see #2 measured result 0.884 -.023v 50.2 slew_rise & slew_fall cycle to cycle jitter & duty cycle vcross & vcross vmax & vmin www.datasheet.co.kr datasheet pdf - http://www..net/
4. pcie6 clock slew_rise slew_fall vcross v cross c-c jitter specification 2.5~8 v/ns see #1 2.5~8 v/ns see #1 300~550 mv see #3 v cross <140 mv see #3 < 125 ps see #2 measured result 3.939 v/ns 3.935 v/ns 500 ~ 530 mv 30 mv 45 ps vmax vmin duty cycle specification < 1.15v see #4 > -0.3v see #4 45%~55% see #2 measured result 0.962 v -0.014 v 49.98 % slew_rise & slew_fall cycle to cycle jitter & duty cycle vcross & vcross vmax & vmin www.datasheet.co.kr datasheet pdf - http://www..net/
5. pcie11 clock slew_rise slew_fall vcross v cross c-c jitter specification 2.5~8 v/ns see #1 2.5~8 v/ns see #1 300~550 mv see #3 v cross <140 mv see #3 < 125 ps see #2 measured result 3.711 v/ns 3.706 v/ns 422 ~ 431 mv 9 mv 52 ps vmax vmin duty cycle specification < 1.15v see #4 > -0.3v see #4 45%~55% see #2 measured result 0.920 v - 0.052 v 50.96 % slew_rise & slew_fall cycle to cycle jitter & duty cycle vcross & vcross vmax & vmin www.datasheet.co.kr datasheet pdf - http://www..net/
6. dot96 clock slew_rise slew_fall vcross v cross c-c jitter specification 2.5~8 v/ns see #1 2.5~8 v/ns see #1 300~550 mv see #3 v cross <140 mv see #3 < 250 ps see #2 measured result 3.455 v/ns 3.538 v/ns 491 ~ 509 mv 51.96 mv 115 ps vmax vmin duty cycle specification < 1.15v see #4 > -0.3v see #4 45%~55% see #2 measured result 0.914 v - 0.028 v 51.59 % slew_rise & slew_fall cycle to cycle jitter & duty cycle vcross & vcross vmax & vmin www.datasheet.co.kr datasheet pdf - http://www..net/
7.pci1 clock slew_rise slew_fall duty cycle c-c jitter specification 1~4 v/ns see #1 1~4 v/ns see #1 45%~55% < 500 ps see #2 measured result 1.56 v/ns 1.32 v/ns 50.81 % 196 ps slew_rise & slew_fall cycle to cycle jitter & duty cycle 8.usb clock slew_rise slew_fall duty cycle c-c jitter specification 1~2 v/ns see #1 1~2 v/ns see #1 45%~55% < 350 ps see #2 measured result 2.01 v/ns 2.29 v/ns 50.65 % 85 ps slew_rise & slew_fall cycle to cycle jitter & duty cycle www.datasheet.co.kr datasheet pdf - http://www..net/
9. ref1 clock slew_rise slew_fall duty cycle c-c jitter specification 1~4 v/ns see #1 1~4 v/ns see #1 45%~55% < 1000 ps see #2 measured result 1.59 v/ns 1.72 v/ns 52.45 % 198 ps slew_rise & slew_fall cycle to cycle jitter & duty cycle 10. phase jitter RTM875N-397 ixx-397 www.datasheet.co.kr datasheet pdf - http://www..net/
handler: peter; e-mail: peter.hsu@realtek.com.tw realtek semiconductor corp. headquarters no. 2, innovation road ii, science-base industrial park, hsinchu, 300, taiwan, r.o.c. tel : 886-3-5780211 ( 3334) fax : 886-3-5776047 www: www.realtek.com.tw www.datasheet.co.kr datasheet pdf - http://www..net/

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