ICS9148-03 Datasheet, PDF (3/12 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for PENTIUM/ProTM

ICS9148 - 03
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)
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
Spread Spectrum Functionality
Pin 23
SSEN#
0
Pin 24
SS_Type
0
CPU, SDRAM
and PCICLOCKS
Frequency Modulated Center Spread Mode
REF, IOAPIC
14.318MHz
24MHz
24MHz
0
1
Frequency Modulated Down Spread Mode
14.318MHz
24MHz
1
0
1
1
Normal, Steady Frequency Mode
Not Allowed
(will lower average frequency)
14.318MHz
14.318MHz
24MHz
24MHz
CPU 3.3#_2.5V Buffer selector for CPUCLK and IOAPIC drivers.
CPU3.3#_2.5
Input level
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
75.0
32
14.318
0
1
0
83.3
41.65 (1/2 CPU)
14.318
0
1
1
68.5
34.25 (1/2 CPU)
14.318
1
0
0
83.3
33.3
14.318
1
0
1
75.0
37.5 (1/2 CPU)
14.318
1
1
0
60.0
30.0 (1/2 CPU)
14.318
1
1
1
66.8
33.4 (1/2 CPU)
14.318
48MHz
48MHz
48MHz
48MHz
48MHz
3