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ICS9250-11 Datasheet Frequency Generator & Integrated Buffers

Manufacturer: Integrated Circuit Systems

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Datasheet Details

Part number ICS9250-11
Manufacturer Integrated Circuit Systems
File Size 194.26 KB
Description Frequency Generator & Integrated Buffers
Download ICS9250-11 Download (PDF)

General Description

The ICS9250-11 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 ICS9212-01, 02, 03 and a PCI buffer 9112-17.

Spread Spectrum may be enabled by driving the SPREAD# pin active.

Overview

Integrated Circuit Systems, Inc.

ICS9250-11 Frequency Timing Generator for PENTIUM II/III™.

Key Features

  • • Generates the following system clocks: - 6 - CPU Clocks 100/133MHz (2.5V). - 2 - CPU/2 output for synchronous memory reference (2.5V). - 4 - fixed frequency Clocks @ 66.6MHz (3.3V). - 2 - fixed frequency Clocks @ 33.3MHz (3.3V). - 6 - IOAPIC Clocks @ ¼ of CPUCLK or 16.667MHz, synchronous to CPU Clock (2.5V) - 1 - 48MHz Clock (3.3V) - 2 - REF Clocks @ 14.31818MHz 0.5% typical down spread modulation on CPU, PCI, IOAPIC, 3V66 and CPU/2 output clocks. Uses external 14.318MHz crystal. • • Block D.

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