General Description

The ICS94225 is a main clock synthesizer chip for AMD-K7 based systems with AMD 750/760 style chipsets. This provides all clocks required for such a system.

Features:

• Programmable ouput frequency

• Programmable ouput rise/fall time

• Programmable group skew

• Real time system reset output

• Spread spectrum for EMI control typically by 7dB to 8dB, with programmable spread percentage

• Watchdog timer technology to reset system if over-clocking causes malfunction

• Uses external 14.318MHz crystal

Output Features:

• 3 differential pair open drain CPU clocks (1.5V external pull-up; up to 150MHz achieviable through I2C)

• 2 - AGPCLK @ 3.3V

• 8 - PCI @3.3V, including 1 free running

• 1 - 48MHz @ 3.3V

• 1 - 24/48MHz @ 3.3V

• 2- REF @3.3V, 14.318MHz.