ICST ICS9112M-41, ICS9112M-42 Datasheet

Integrated
Circuit
Systems, Inc.

General Description Features

ICS91 12-41/42

Block Diagram

Frequency Generator for Gigabit Ethernet Systems

Applications

ICS9112-41/42 Rev D 3/3/99

The ICS9112-41/42 is a high speed clock generator designed
to support Gigabit Ethernet system requirements. The ICS91 12-
41/42 generates 125 MHz from a 25 MHz crystal.

An exact frequency multiplying ratio ensures better than ±100
ppm frequency accuracy using a standard AT crystal with
external load capacitors (typically 33pF±5% for an 18pF load
crystal). Achieving ±100 ppm over four years requires the
crystal to have a ±20 ppm initial accuracy , ±30 ppm temperature
and ±5 ppm/year aging coefficients.

The ICS9112-41/42 with less than 25ps accumulative jitter is
well suited for Gigabit Ethernet applications.

• Generates 125 MHz clocks from a 25 MHz crystal

• Less than 45ps one sigma jitter (15ps typ.)

• Less than ±130ps absolute jitter

• Less than 25ps accumulative jitter @ 256 cycles

• Rise/fall times less than 1.2ns driving 15pF

• On-chip loop filter components

• 3.0V-5.5V supply range

• 8-pin, 150-mil SOIC package

• Specifically designed to support the high-speed
clocking requirements of Gigabit Ethernet systems.

PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.

Preliminary Product Preview

2

ICS9112-41/42

Preliminary Product Preview

Pin Descriptions

Pin Configurations

8-Pin SOIC

Functionality

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NIP

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