ICS9248-171 Datasheet, PDF (3/15 Pages) Integrated Circuit Systems – AMD - K7TM System Clock Chip

ICS9248-171
Advance Information
General Description
The ICS9248-171 is a main clock synthesizer chip for AMD-K7 based systems with ALI 1647 style chipset. This provides all
clocks required 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 ICS9248-171
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.
Mode Pin - Power Management Input Control
MODE, Pin 18
(Latched Input)
0
1
Pin 27
PCI_STOP#
(Input)
SDRAM10
(Output)
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