ICS843SDN datasheet(1/14 Pages) IDT

Part #	ICS843SDN

Description	FEMTOCLOCK??CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR

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Manufacturer	IDT [Integrated Device Technology]

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FEMTOCLOCK™ CRYSTAL-TO-

3.3V LVPECL CLOCK GENERATOR

ICS843SDN

IDT™ / ICS™ 3.3V LVPECL CLOCK GENERATOR

1

ICS843SDNAG REV. A FEBRUARY 19, 2009

General Description

The ICS843SDN is a Gigabit Ethernet Clock

Generator and a member of the HiPerClocksTM

family of high performance devices from IDT. The

ICS843SDN uses a 24MHz crystal to synthesize

120MHz. The ICS843SDN uses IDT’s 3rd generation

low phase noise VCO technology, and can achieve <1ps rms

phase jitter performance over the 12kHz – 20MHz integration

range. The ICS843SDN is packaged in a small 8-pin TSSOP,

making it ideal for use in systems with limited board space.

Features

• One differential 3.3V LVPECL output

• Crystal oscillator interface designed for 23.2MHz – 30MHz,

18pF parallel resonant crystal

• Output frequency range: 116MHz – 150MHz

• VCO range: 580MHz – 750MHz

• Output duty cycle range: 47% – 53%

• RMS phase jitter @ 120MHz, using a 24MHz crystal

(12kHz – 20MHz): 0.81ps (typical)

• Full 3.3V supply mode

• 0°C to 70°C ambient operating temperature

• Industrial temperature information available upon request

• Available in lead-free (RoHS 6) package

Table 1. Frequency Table - Typical Applications

HiPerClockS™

ICS

Crystal Frequency (MHz)

Output Frequency (MHz)

25

125

24

120

ICS843SDN

8 Lead TSSOP

4.40mm x 3.0mm x 0.925mm package body

G Package

Top View

Pin Assignment

1

2

3

4

8

7

6

5

VCCA

VEE

XTAL_OUT

XTAL_IN

VCC

Q

nQ

nc

OSC

Phase

Detector

VCO

÷5

÷25

(fixed)

Q

nQ

XTAL_IN

XTAL_OUT

25MHz

Block Diagram

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