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參數(shù)資料
| 型號： | W48S87-04 |
| 廠商： | IC WORKS INC |
| 元件分類： | XO, clock |
| 英文描述： | Spread Spectrum 3 DIMM Desktop Clock(寬頻譜3 DIMM桌上型PC機(jī)時鐘) |
| 中文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 文件頁數(shù)： | 18/21頁 |
| 文件大小： | 200K |
| 代理商： | W48S87-04 |
W48S87-04
PRELIMINARY
18
3.3V AC Electrical Characteristics
(CPU3.3#_2.5 Input = 0)
(continued)
IOAPIC Clock Output (Lump Capacitance Test Load = 20 pF)
Parameter
f
Description
Test Condition/Comments
Frequency generated by crystal oscillator
CPU = 60/66.8 MHz
Unit
MHz
Min.
Typ.
Max.
Frequency, Actual
14.31818
t
R
t
F
t
D
f
ST
Output Rise Edge Rate
Measured from 0.4V to 2.4V
1
4
V/ns
Output Fall Edge Rate
Measured from 2.4V to 0.4V
1
4
V/ns
Duty Cycle
Measured on rising and falling edge at 1.5V
45
55
%
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.
1.5
ms
Z
o
AC Output Impedance
Average value during switching transition.
Used for determining series termination value.
8
12
15
REF0 Clock Output (Lump Capacitance Test Load = 45 pF)
Parameter
f
Description
Test Condition/Comments
Frequency generated by crystal oscillator
CPU = 60/66.8 MHz
Unit
MHz
Min.
Typ.
Max.
Frequency, Actual
14.31818
t
R
t
F
t
D
f
ST
Output Rise Edge Rate
Measured from 0.4V to 2.4V
1
4
V/ns
Output Fall Edge Rate
Measured from 2.4V to 0.4V
1
4
V/ns
Duty Cycle
Measured on rising and falling edge at 1.5V
40
60
%
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.
1.5
ms
Z
o
AC Output Impedance
Average value during switching transition.
Used for determining series termination value.
17
20
25
REF1 Clock Output (Lump Capacitance Test Load = 20 pF)
Parameter
Description
Test Condition/Comments
CPU = 60/66.8 MHz
Min.
Typ.
Unit
Max.
f
Frequency, Actual
Frequency generated by crystal oscillator
14.31818
MHz
t
R
t
F
t
D
f
ST
Output Rise Edge Rate
Measured from 0.4V to 2.4V
1
4
V/ns
Output Fall Edge Rate
Measured from 2.4V to 0.4V
1
4
V/ns
Duty Cycle
Measured on rising and falling edge at 1.5V
40
55
%
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.
1.5
ms
Z
o
AC Output Impedance
Average value during switching transition.
Used for determining series termination value.
20
25
35
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