COMMERCIAL TEMPERATURE RANGE
IDTCV125
PROGRAMMABLE FLEXPC CLOCK FOR P4 PROCESSOR
19
Symbol Parameter Min. Typ. Max. Unit
tR1 Clock Rise Time
(1,2,3)
175 — 700 ps
tF1 Clock Fall Time
(1,2,3)
175 — 700 ps
∆ tR Clock Rise Time Variation
(2,3,4)
— — 125 ps
∆ tF Clock Fall Time Variation
(2,3,4)
— — 125 ps
Rise/Fall Matching
(2,3,5)
—— 20%
VHIGH Voltage HIGH
(2,3,6)
660 700 850 mV
VLOW Voltage LOW
(2,3,7)
-150 0 — mV
VCROSS(ABS) Crossing Voltage (abs)
(2,3,8,9,10)
250 — 550 mV
VCROSS(REL) Crossing Voltage (rel)
(2,3,10,11)
Calc. — Calc.
TOTAL ∆ VCROSS Total Variation of VCROSS Over All Edges
(2,3,12)
— — 140 mV
tJCYC-CYC Cycle-to-Cycle Jitter
(2,13)
— — 350 ps
dT3 Duty Cycle
(2,13)
45 — 55 %
VOVS Maximum Voltage Allowed at Output (overshoot)
(2,3,14)
——VHIGH + 0.3V V
VUDS Minimum Voltage Allowed at Output (undershoot)
(2,3,15)
-0.3 — — V
V
RB Ringback Margin
(2,3)
n/a — 0.2 V
LVDS AC TIMING REQUIREMENTS
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = 0°C to +70°C
NOTES:
1. Measured from VOL = 1.75V to VOH =0.525V. Only valid for Rising LVDS and Falling LVDS#. Signal must be monotonic through the VOL to VOH region for tRISE and tFALL.
2. Test configuration is Rs = 32.2Ω, Rp = 49.9Ω, 2pF.
3. Measurement taken from single-ended waveform.
4. Measured with oscilloscope, averaging off, using Min. Max. statistics. Variation is the delta between Min. and Max.
5. Measured with oscilloscope, averaging off, the difference between the tRISE (average) of LVDS versus the tFALL (average) of LVDS#.
6. VHIGH is defined as the statistical average HIGH value as obtained by using the oscilloscope VHIGH math function.
7. VLOW is defined as the statistical average LOW value as obtained by using the oscilloscope VLOW math function.
8. Measured at crossing point where the instantaneous voltage value of the rising edge of LVDS equals the falling edge of LVDS#.
9. This measurement refers to the total variation from the lowest crossing point to the highest, regardless of which edge is crossing.
10. The crossing point must meet the absolute and relative crossing point specifications simultaniously.
11. VCROSS (rel) Min. and Max. are derived using the following: VCROSS (rel) Min. = 0.25V + 0.5 (VHAVG - 0.7V), VCROSS (rel) Max. = 0.55V + 0.5 (0.7V - VHAVG).
12. ∆ VCROSS is defined as the total variation of all crossing voltages of Rising LVDS and Falling LVDS#. This is the maximum allowed variance in VCROSS for any particular system.
13. Measurement is taken from differential waveform.
14. Overshoot is defined as the absolute value of the maximum voltage.
15. Undershoot is defined as the absolute value of the minimum voltage.
