ICS9148-111 Datasheet, PDF (3/18 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for PENTIUM/ProTM

General Description
The ICS9148-111 is a single chip clock solution for Desktop/
Notebook designs using the ALI (Aladdin V^™) mobile style
chipset. It provides all necessary clock signals for such a
system.
Spread spectrum may be enabled through I²C programming.
Spread spectrum typically reduces system EMI by 8dB to
10dB. This simplifies EMI qualification without resorting to
board design iterations or costly shielding. The ICS9148-111
employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
Serial programming I²C interface allows changing functions,
stop clock programming and frequency selection.
ICS9148-111
Power Groups
VDD1 = REF (0:1), X1, X2
VDD2 = PCICLK_F, PCICLK(0:5)
VDD3 = SDRAM (0:12), supply for PLL core
VDD4 = AGP (1:2)
VDD5 = Fixed PLL, 48MHz , AGP0
VDDL = CPUCLK (0:2)
Mode Pin - Power Management Input Control
MODE, Pin 25
(Latched Input)
0
1
Pin 17
CPU_STOP#
(INPUT)
SDRAM 11
(OUTPUT)
Pin 18
PCI_STOP#
(INPUT)
SDRAM 10
(OUTPUT)
Pin 20
AGP_STOP#
(INPUT)
SDRAM 9
(OUTPUT)
Pin 21
PD#
(INPUT)
SDRAM 8
(OUTPUT)
Power Management Functionality
AGP_STOP# CPU_STOP# PCI_STOP#
1
0
1
1
1
1
1
1
0
0
1
1
AGP,
CPUCLK
Outputs
Stopped Low
PCICLK
(0:5)
Running
PCICLK_F,
REF, 48MHz
and SDRAM
Running
Running
Running
Running
Running Stopped Low Running
Running
Running
Running
Crystal
OSC
Running
Running
Running
Running
VCO AGP(1:2)
Running Running
Running Running
Running Running
Running Stopped Low
CPU 3.3#_2.5V Buffer selector for CPUCLK drivers.
CPU3.3#_2.5
Input level
(Latched Data)
1
0
Buffer Selected for
operation at:
2.5V VDD
3.3V VDD
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