General Description

The ICS94235 is a main clock synthesizer chip for AMD-K7 based systems with ALI 1647 style chipsets. This provides all clocks required for such a system.

Features:

• Programmable ouput frequency

• Programmable ouput rise/fall time

• Programmable CPU, SDRAM, PCI and AGP 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:

• 1 - Differential pair open drain CPU clocks

• 1 - Single-ended open drain CPU clock

• 13 - SDRAM @ 3.3V

• 7 - PCI @ 3.3V

• 2 - AGP @ 3.3V

• 1 - 48MHz, @3.3V

• 1 - REF @ 3.3V, (selectable strength) through I2C