ICS9148-08 Datasheet, PDF (3/14 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for PENTIUM/Pro

Mode Pin - Power Management Input Control
MODE, Pin 25
(Latched Input)
0
1
Pin 46
CPU_STOP#
(INPUT)
REF1
(OUTPUT)
Pin 15
PCI_STOP#
(INPUT)
PCICLK5
(OUTPUT)
ICS9148 - 08
Power Management Functionality
CPU_STOP#
0
1
1
PCI_STOP#
1
1
0
CPUCLK
Outputs
Stopped Low
Running
Running
PCICLK
(0:5)
Running
Running
Stopped Low
PCICLK_F,
REF,
24/48MHz
and SDRAM
Running
Running
Running
Crystal
OSC
Running
Running
Running
VCO
Running
Running
Running
CPU 3.3#_2.5V Buffer selector for CPUCLK and IOAPIC drivers.
CPU3.3#_2.5
Input level
(Latched Data)
1
0
Buffer Selected for
operation at:
2.5V VDD
3.3V VDD
Functionality
V_DD1,2,3 = 3.3V±5%, V_DDL1,2 = 2.5V±5% or 3.3±5%, TA=0 to 70°C
Crystal (X1, X2) = 14.31818MHz
FS2
FS1
FS0
CPU,
SDRAM(MHz)
PCICLK
(MHz)
REF, IOAPIC
(MHz)
0
0
0
50.0
25.0 (1/2 CPU)
14.318
0
0
1
0
1
0
0
1
1
75.0
30 (CPU/2.5)
14.318
83.3
33.3
14.318
68.5
34.25 (1/2 CPU)
14.318
1
0
0
55.0
27.5 (1/2 CPU)
14.318
1
0
1
75.0
37.5 (1/2 CPU)
14.318
1
1
0
1
1
1
60.0
30.0 (1/2 CPU)
14.318
66.8
33.4 (1/2 CPU)
14.318
3