Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9169C-41

Block Diagram

Frequency Generator for PentiumPro™ Based Systems

9169-41Rev D 5/02/00

Pin Configuration

34-Pin SSOP

Pentium is a trademark on Intel Corporation.

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12 selectable CPU/SDRAM/AGP clocks up to 75 MHz

•

Six PCI clocks, synchronous or asynchronous mode, pin

selectable by Bus Select input (pin 19)

•

One USB clock at 48MHz, meets Intel jitter, accuracy, as

well as rise and fall time requirements

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One I/O clock at 24MHz

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Two Ref. Clocks at 14.318MHz

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CPU clocks to PCI clock skew of 1-4ns (CPU early)

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Low CPU and PCI clock jitter <200ps

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Low skew outputs, skew window 250ps for CPU clocks

and for PCI clocks

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Improved output drivers are designed for low EMI

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Test Mode

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3.3V ±10% operation

•

Space saving and low cost 34-pin SSOP package

The ICS9169C-41 is a Clock Synthesize/Driver chip for

Pentium, PentiumPro or Cyrix 68x86 based motherboards

using SDRAM.

Features include four dual purpose I/O pins which provide

extra CPU clocks and enable the part to be packaged in a

low-cost 34-pin SSOP package. These four pins latch the

select inputs at the internal Power-On Reset. Additionally,

the device meets the Pentium and PentiumPro power-up

stabilization, which requires that CPU and PCI clocks be

stable within 2ms after power-up.

The ICS9169C-41 clock outputs are designed for low EMI

emissions.

Controlled rise and fall times, unique output

driver circuits and innovative circuit layout techniques enable

the ICS9169C-41 to have lower EMI than other clock

devices.

The ICS9169C-41 accepts a 14.318MHz reference crystal or

clock as its input and runs from a 3.3V supply.

ICS reserves the right to make changes in the device data identified in this

publication without further notice. ICS advises its customers to obtain the latest

version of all device data to verify that any information being relied upon by the

customer is current and accurate.