W164
| Model | W164 |
| Description | Spread Spectrum Desktop/Notebook System Frequency Generator |
| PDF file | Total 11 pages (File size: 140K) |
| Chip Manufacturer | CYPRESS |
W164
PCI Clock Outputs, PCI1:6 and PCI_F (Lump Capacitance Test Load = 30 pF
CPU = 66.8/100 MHz
Parameter
t
P
t
H
t
L
t
R
t
F
t
D
t
JC
t
SK
t
O
f
ST
Description
Period
High Time
Low Time
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Jitter, Cycle-to-Cycle
Output Skew
CPU to PCI Clock Skew
Frequency Stabilization
from Power-up (cold
start)
AC Output Impedance
Test Condition/Comments
Measured on rising edge at 1.5V
Duration of clock cycle above 2.4V
Duration of clock cycle below 0.4V
Measured from 0.4V to 2.4V
Measured from 2.4V to 0.4V
Measured on rising and falling edge at 1.5V
Measured on rising edge at 1.5V. Maximum
difference of cycle time between two adjacent cycles.
Measured on rising edge at 1.5V
Covers all CPU/PCI outputs. Measured on rising
edge at 1.5V. CPU leads PCI output.
Assumes full supply voltage reached within 1 ms
from power-up. Short cycles exist prior to frequency
stabilization.
Average value during switching transition. Used for
determining series termination value.
20
1
Min.
30
12
12
1
1
45
4
4
55
250
500
4
3
Typ.
Max.
Unit
ns
ns
ns
V/ns
V/ns
%
ps
ps
ns
ms
Z
o
Ω
IOAPIC Clock Output (Lump Capacitance Test Load = 20 pF)
CPU = 66.8/100 MHz
Parameter
f
t
R
t
F
t
D
f
ST
Description
Frequency, Actual
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Frequency Stabilization
from Power-up (cold start)
AC Output Impedance
Test Condition/Comments
Frequency generated by crystal oscillator
Measured from 0.4V to 2.0V
Measured from 2.0V to 0.4V
Measured on rising and falling edge at 1.25V
Assumes full supply voltage reached within
1 ms from power-up. Short cycles exist prior to
frequency stabilization.
Average value during switching transition. Used
for determining series termination value.
15
1
1
45
Min.
Typ.
14.31818
4
4
55
1.5
Max.
Unit
MHz
V/ns
V/ns
%
ms
Z
o
Ω
REF2X Clock Output (Lump Capacitance Test Load = 20 pF)
CPU = 66.8/100 MHz
Parameter
f
t
R
t
F
t
D
f
ST
Description
Frequency, Actual
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Frequency Stabilization from
Power-up (cold start)
AC Output Impedance
Test Condition/Comments
Frequency generated by crystal oscillator
Measured from 0.4V to 2.4V
Measured from 2.4V to 0.4V
Measured on rising and falling edge at 1.5V
Assumes full supply voltage reached within
1 ms from power-up. Short cycles exist prior to
frequency stabilization.
Average value during switching transition. Used
for determining series termination value.
15
0.5
0.5
45
Min.
Typ.
14.318
2
2
55
3
Max.
Unit
MHz
V/ns
V/ns
%
ms
Z
o
Ω
9
