ICS9147-12 Datasheet, PDF (3/9 Pages) Integrated Circuit Systems – Pentium/ProTM System and Cyrix™ Clock Chip

Functionality
V_DD = 3.3V ±5%,V_DDL = 2.5V ±5% or 3.3V ±5%,T_A = 0 to 70°C
Crystal (X1, X2) = 14.31818 MHz
FS2
FS1
FS0
CPUCLK, SDRAM
(MHz)
0
0
0
83.3
0
0
1
75
0
1
0
83.3
0
1
1
68.5
1
0
0
55
1
0
1
75
1
1
0
60
1
1
1
66.8
PCICLK
(MHz)
1/2 CPU
30
33.3
1/2 CPU
1/2 CPU
1/2 CPU
1/2 CPU
1/2 CPU
ICS9147-12
Power Management Functionality
PCICLK_F,
PD#
CPUCLK PCICLK(0:5)
REF,
Outputs
Outputs
24/48MHz
and SDRAM
0
Stopped Low Stopped Low Stopped Low
1
Running
Running
Running
Crystal
OSC
Off
Running
VCO
Off
Running
3