Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9177

Block Diagram

ICS9177RevB060297P

High Frequency System Clock Generator

The ICS9177 is a multiple output clock generator ideal for

high speed processor system applications. A single high-

speed internal VCO is utilized to derive up to four simultaneous

clock output frequencies. This enables output clock skew

matching and the minimization of clock jitter. The internal

VCO operates up to 350 MHz providing edge skew matched

output clocks.

One differential PECL (Positive ECL) output pair provides a

high speed processor clock. 12 TTL clock outputs are also

provided for other system functions, such as bus clocks. Input

selection pins are used to select the TTL output clock

frequencies.

For information about ICS9177 customization optics, please

contact ICS.

•

Provides output frequencies up to 175 Mhz

•

Internal VCO is divided into four skew-matched output

frequencies (Out A, B, C, D)

•

External clock feedback provides input to output skew

matching

•

Differential PECL clock output pair provided for high

speed output (Out A)

•

12 TTL clock outputs (for Out B, C, D)

•

Single 5 volt power supply voltage

•

Internal loop filters

•

52-pin QFP package

Pin Configuration

52-Pin QFP

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.