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ICS94228

0447E—05/07/04

General Description

The ICS94228 is a main clock synthesizer chip for AMD-K7 based systems with VIA style chipset. This provides all

clocks required for such a system.

The ICS94228 belongs to ICS new generation of programmable system clock generators.

It employs serial

programming I

strength, configuring output to output skew, changing spread spectrum amount, changing group divider ratio and dis/

enabling individual clocks.

This device also has ICS propriety 'Watchdog Timer' technology which will reset the

frequency to a safe setting if the system become unstable from over clocking.

SRESET# Signal Description

The SRESET# signal from ICS94228 system clock generator is a real time active low pulse that can be used to reset

the system.

The Open-Drain Nch output Reset# pin needs to be tied to the system reset line which has a pull-up resistor. When

activated, the SRESET# output will be driven to a low with a 32ms pulse width.