General Description

The ICS9248-66 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 Direct Rambus Clock Generator(DRCG) chip such as the ICS9211-01.

特性 Features

? Generates the following system clocks:

- 3 CPU clocks ( 2.5V, 100/133MHz)

- 8 PCI clocks, including 1 free-running (3.3V, 33MHz)

- 1 CPU/2 clocks (2.5V, 50/66MHz)

- 1 IOAPIC clocks (2.5V, 16.67MHz)

- 3 Fixed frequency 66MHz clocks(3.3V, 66MHz)

- 2 REF clocks(3.3V, 14.318MHz)

- 1 USB clock (3.3V, 48MHz)

? Efficient power management through PD#, CPU_STOP# and PCI_STOP#.

? 0 to -0.5 typical down spread modulation on CPU, PCI, IOAPIC, 3V66 and CPU/2 output clocks.

? Uses external 14.318MHz crystal.