DATASHEET

ETHERNET SWITCH CLOCK SOURCE

ICS650-40

IDT™ / ICS™ ETHERNET SWITCH CLOCK SOURCE

1

ICS650-40

REV E 051310

Description

The ICS650-40 is a clock chip designed for use in Ethernet

Switch applications. Using IDT’s patented Phase-Locked

Loop (PLL) techniques, the device takes a 25 MHz crystal

input and produces various output clock frequencies as

listed in Output Select Table.

Features

• Packaged in 16-pin TSSOP

• Pb (lead) free package

• Operating voltage of 3.3 V

• Low power consumption

• Input frequency of 25 MHz

• Low long-term jitter

• 2.5 V to 3.3 V clock outputs

Block Diagram

Phase Lock Loop

Clock

Buffer/

Crystal

Oscillator

VDD

GND

3

4

X1/ICLK

X2

25 MHz

crystal or clock

Control

Logic

OE

S1:S0

CLKB

2

CLKA

Optional tuning crystal

capacitors

VDDOA

VDDOB