ICS9248-136 Datasheet, PDF (3/16 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for K7 Processor

ICS9248-136
Advance Information
General Description
The ICS9248-136 is the single chip clock solution for Desktop/Notebook designs using the SIS 630S 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 ICS9248-136
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.
Power Groups
VDDCPU = CPU
VDDPCI = PCICLK_F, PCICLK
VDDSDR = SDRAM
VDD48 = 48MHz, 24MHz, fixed PLL
VDDA = Core, PLL, X1, X2
VDDAGP=AGP, REF
MODE Pin Power Management Control Input
MODE
Pin 21
0
Pin 27
SDRAM11
Pin 28
SDRAM10
Pin 30
SDRAM9
1
CPU_STOP# PCI_STOP# SDRAM_STOP#
Pin 31
SDRAM8
PD#
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