DATASHEET

NETWORKING CLOCK SYNTHESIZER AND ZERO DELAY BUFFER

ICS680-01

IDT™ / ICS™ NETWORKING CLOCK SYNTHESIZER AND ZERO DELAY BUFFER 1

ICS680-01

REV H 051310

Description

The ICS680-01 generates four high-frequency clock outputs

and a reference from a 25 MHz crystal or clock input. The

device includes a low-skew, single input to four output zero

delay clock buffer. It can replace multiple crystals and

oscillators, saving board space and cost.

The device has a power-down tri-state (PDTS) pin that place

the clock outputs in a high-impedance state when pulled

low. The PDTS pin includes an internal pull-up resistor.

Features

• Packaged in 24-pin TSSOP

• Pb (lead) free package, RoHS compliant

• Replaces multiple crystals and oscillators

• Input crystal or clock frequency of 25 MHz

• Five output driver driven by external clock

• Duty cycle of 45/55

• Operating voltage of 3.3 V

• Advanced, low-power CMOS process

• Fixed output frequencies of 25 MHz and 48 MHz

• Selectable output frequencies of 24 MHz, 48 MHz, 50

MHz and 66.6666 MHz

• Qx outputs replace costly discrete buffer

• Low-skew buffer outputs (250 ps)

Block Diagram

Divide

Logic

and

Output

Enable

Control

External capacitors

may be required.

S0

VDD

CLK2

CLK1

48M

25M

Q0

5

Q2

Q3

GND

PDTS

2

X1/ICLK

X2

Crystal

Oscillator

25 MHz

Crystal or Clock

PLLA

PLLB

Q1

ICLK

S1

PLL/Buffer

PLLC

QFB