參數(shù)資料
型號: CDC922DLR
英文描述: CPU System Clock Generator
中文描述: CPU系統(tǒng)時鐘發(fā)生器
文件頁數(shù): 3/17頁
文件大小: 292K
代理商: CDC922DLR
CDC922
133-MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS
WITH 3-STATE OUTPUTS
SCAS634 –JULY 28, 1999
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
21–23
3V66 [0–2]
O
3.3 V, Type 5, 66-MHz clock outputs
48MHz
27
O
3.3 V, Type 3, 48-MHz clock output
APIC
46
O
2.5 V, Type 2, APIC clock output at 16.67 MHz
CPU [0–2]
36, 37, 40
O
2.5 V, Type 1, CPU clock outputs
CPU_DIV2
43
O
2.5 V, Type 1, CPU_DIV2 clock output
GND
6, 14, 20, 26,
33, 35, 39, 42,
45, 48
Ground for PCI, 3V66, 48MHz, CPU, CPU_DIV2, APIC, REF [0–1] outputs and CORE
PCI [0–9]
7, 8, 10–13,
15, 16, 18, 19
O
3.3 V, Type 5, 33-MHz PCI clock outputs
PWR_DWN
32
I
Power down for complete device with outputs forced low
REF0, REF1
1, 2
O
3.3 V, Type 3, 14.318-MHz reference clock outputs
SEL0, SEL1
29, 30
I
LVTTL level logic select terminals for function selection
SEL133/100
25
I
LVTTL level logic select terminal for enabling 100/133 MHz
SPREAD
31
I
Disables SSC function
VDD2.5V
VDD3.3V
38, 41, 44, 47
Power for CPU, CPU_DIV2, and APIC outputs
3, 9, 17, 24,
28, 34
Power for the REF, PCI, 3V66, 48MHz outputs and CORE
XIN
4
I
Crystal input – 14.318 MHz
XOUT
5
O
Crystal output – 14.318 MHz
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