FEMTOCLOCK™ CRYSTAL-TO-

3.3V LVPECL CLOCK GENERATOR

ICS843SDN

IDT™ / ICS™ 3.3V LVPECL CLOCK GENERATOR

1

ICS843SDNAG REV. A

NOVEMBER 13, 2012

General Description

The ICS843SDN is a Gigabit Ethernet Clock Generator. 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

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