ICST AV9120M-56 Datasheet

Integrated
Circuit
Systems, Inc.

General Description

Features

ICS9120-56

Frequency Timing Generator for EtherNet & Hard Drives

Block Diagram

• Single 25.00 MHz crystal or system clock reference

• 100ps one sigma jitter maintains 16-bit performance

• Output rise/fall times less than 2.0ns

• On-chip loop filter components

• 3.3V-5V supply range

• 8-pin, 150-mil SOIC

Applications

• Specifically designed to support the high performance
requirements of high speed EtherNet systems using
10Base-T/100Base-TX Integrataed PHYceiver .

• Designed to support the requirements for high
performance hard drives.

The ICS9120-56 is a high performance frequency generator
designed to support hard disk drive and EtherNet systems. It
offers all clock frequencies required for the servo and decoder
sections of these devices. These frequencies are synthesized
from a single 25.00 MHz on-chip oscillator.

High accuracy, low jitter PLLs meet the 100 ppm frequency
tolerance required by these systems. Fast output clock
edge rates minimize board induced jitter.

Pin Configuration

8-Pin SOIC

9120-56 Rev A 040697P

2

ICS9120-56

Pin Descriptions for ICS9120-56

PIN

NUMBER

PIN

NAME

TYPE DESCRIPTION

1 X1 Input

Crystal or external clock source. Has feedback bias for crystal, and internal

crystal loa d capacito rs to GND .
2 VDD Power +Power supply input.
3 GND Power Ground return for Pin 2.
4 CLK1 Output 40.00 MHz clock output.
5 CLK2 Output 22.5 MHz output clock.
6 CLK3 Output 20.00 MHz output clock.
7 REF Output Reference clock
8 X2 Outpu t C rystal ou tpu t drive, inclu des internal cr ystal load capa citor to GN D.