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W158
Document #: 38-07164 Rev. *A
Page 11 of 13
Note:
39. IOAPIC clock is CPU/8 for CPU = 133 MHz and CPU/6 for CPU = 100 MHz.
IOAPIC Clock Outputs, IOAPIC0:2 (Lump Capacitance Test Load = 20 pF)
Parameter
Description
Test Condition/Comments
Min
Typ
Max
Unit
f
Frequency
Note 39
16.67
MHz
tR
Output Rise Edge Rate
Measured from 0.4V to 2.0V
1
4
V/ns
tF
Output Fall Edge Rate
Measured from 2.0V to 0.4V
1
4
V/ns
tD
Duty Cycle
Measured on rising and falling edge at 1.25V
45
55
%
fST
Frequency Stabilization
from Power-up (cold start)
Assumes full supply voltage reached within
1 ms from power-up. Short cycles exist prior to
frequency stabilization.
3ms
Zo
AC Output Impedance
Average value during switching transition. Used
for determining series termination value.
20
Ω
Ordering Information
Ordering Code
Package
Name
Package Type
W158
H
56-pin SSOP (300 mils)
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