W159
| Model | W159 |
| Description | Spread Spectrum System FTG for SMP Systems |
| PDF file | Total 11 pages (File size: 138K) |
| Chip Manufacturer | CYPRESS |
W159
CPUdiv2 Clock Outputs, CPUdiv2_0:1 (Lump Capacitance Test Load = 20 pF)
CPU = 133 MHz
Parameter
t
P
t
H
t
L
t
R
t
F
t
D
t
JC
Description
Period
High Time
Low Time
Output Fall Edge Rate
Duty Cycle
Jitter, Cycle-to-Cycle
Test Condition/Comments
Measured on rising edge at 1.25V
Duration of clock cycle above 2.0V
Duration of clock cycle below 0.4V
Measured from 2.0V to 0.4V
Measured on rising and falling edge at
1.25V
Measured on rising edge at 1.25V. Max-
imum difference of cycle time between
two adjacent cycles.
Measured on rising 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 transi-
tion. Used for determining series termi-
nation value.
20
15
5.25
5.05
1
1
45
4
4
55
250
15.3
CPU = 100 MHz
Typ. Max.
20.4
Unit
ns
ns
ns
4
4
55
250
V/ns
V/ns
%
ps
20
7.5
7.3
1
1
45
Min. Typ. Max. Min.
Output Rise Edge Rate Measured from 0.4V to 2.0V
t
SK
f
ST
Output Skew
Frequency Stabiliza-
tion from Power-up
(cold start)
AC Output Impedance
175
3
175
3
ps
ms
Z
o
20
Ω
APIC Clock Outputs, APIC0:2 (Lump Capacitance Test Load = 20 pF)
Parameter
f
t
R
t
F
t
D
f
ST
Description
Frequency
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Frequency Stabilization
from Power-up (cold start)
AC Output Impedance
Note 21
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.
20
1
1
45
Test Condition/Comments
Min
Typ
16.67
4
4
55
3
Max
Unit
MHz
V/ns
V/ns
%
ms
Z
o
Ω
Note:
21. APIC clock is CPU/8 for CPU = 133 MHz and CPU/6 for CPU = 100 MHz.
Ordering Information
Ordering Code
W159
Package
Name
H
Package Type
56-pin SSOP (300 mils)
Intel is a registered trademark of Intel Corporation.
Document #: 38-07163 Rev. *A
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