General Description

The ICS9248-107 is a main clock synthesizer chip for Pentium II based systems using Rambus Interface DRAMs. This chip provides all the clocks required for such a system when used with a zero delay buffer such as the ICS9179-06.

Output Features:

• 4 - CPUs @ 2.5V, up to 180MHz.

• 3 - IOAPIC @ 2.5V

• 3 - 3V66MHz @ 3.3V.

• 11 - PCIs @ 3.3V

• 1 - 48MHz, @ 3.3V fixed

• 1 - 24/48MHz, @ 3.3V

Features:

• Up to 180MHz frequency support

• Use a zero delay buffer such as the ICS9179-06 to generate SDRAM clocks.

• Support power management: Power down Mode from I2C programming.

• Spread spectrum for EMI control ± 0.25 center spread).

• Uses external 14.318MHz crystal

• 5 - FS pins for frequency select

Recommended Application:

RCC chipset