参数资料
型号: W156
英文描述: Clocks and Buffers
中文描述: 时钟和缓冲器
文件页数: 11/13页
文件大小: 167K
代理商: W156
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
f
Frequency
t
R
Output Rise Edge Rate
t
F
Output Fall Edge Rate
t
D
Duty Cycle
f
ST
Frequency Stabilization
from Power-up (cold start)
Test Condition/Comments
Min
Typ
16.67
Max
Unit
MHz
V/ns
V/ns
%
ms
Note 39
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.
1
1
4
4
55
3
45
Z
o
AC Output Impedance
20
Ordering Information
Ordering Code
W158
Package
Name
H
Package Type
56-pin SSOP (300 mils)
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