CDC925 Datasheet, PDF (15/18 Pages) Texas Instruments – 133-MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS WITH 3-STATE OUTPUTS

CDC925
133-MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS
WITH 3-STATE OUTPUTS
SCAS633 – JULY 28, 1999
PARAMETER MEASUREMENT INFORMATION
CPUx or PCIx Clock
CPUx or PCIx Clock
tsk(o)
tc
t(low)
t(high)
VT_REF
VT_REF
Ť Ť + t_sk(p) t_PLH–t_PHL
+ Duty Cycle
t_{(low or high)}
t_c
100
3V66 or CPUx
VT_REF
3V66, PCIx, or APICx
VT_REF
CPU
(internal)
PCI
(internal)
t(off) [3V66 to PCIx]
t(off) [CPUx to APICx]
t(off) [CPUx to 3V66]
Figure 4. Waveforms for Calculation of Skew, Offset, and Jitter
CPU_STOP
PCI_STOP
PWR_DOWN
PCI_F
(external)
CPU
(external)
3V66
(external)
Figure 5. CPU_STOP Timing
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