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ICS844001I

Part Number	ICS844001I
Manufacturer	ICS
Description	CRYSTAL-TO- LVDS CLOCK GENERATOR
Published	Oct 2, 2007
Detailed Description	www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844001I FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK GENE...
Datasheet	ICS844001I PDF File

Overview

www.
DataSheet4U.
com PRELIMINARY Integrated Circuit Systems, Inc.
ICS844001I FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK GENERATOR F EATURES • (1) Differential LVDS output • Crystal oscillator interface, 18pF parallel resonant crystal (20.
4MHz - 28.
3MHz) • Output frequency range: 81.
66MHz - 226.
66MHz • VCO range: 490MHz - 680MHz • RMS phase jitter @ 106.
25MHz, using a 26.
5625MHz crystal (637kHz - 10MHz): 0.
74ps (typical) • 3.
3V or 2.
5V operating supply • -40°C to 85°C ambient operating temperature GENERAL DESCRIPTION The ICS844001I is a Fibre Channel Clock Generator and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS.
The ICS844001I uses an 18pF parallel resonant crystal over the range of 20.
4MHz - 28.
3MHz.
For Fibre Channel applications, a 26.
5625MHz crystal is used.
The frequency select pin allows the device to generate either 106.
25MHz or 212.
5MHz from a 26.
5625MHz cr ystal.
To generate 187.
5MHz for 12Gb Ethernet, a 23.
4375MHz crystal is used.
The ICS844001I uses ICS’ 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting Fibre Channel and Ethernet jitter requirements.
The ICS844001I is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space.
ICS COMMON CONFIGURATION TABLE - FIBRE CHANNEL, 12Gb ETHERNET Inputs Crystal Frequency (MHz) 26.
5625 26.
5625 23.
4375 FREQ_SEL 0 1 1 M 24 24 24 N 6 3 3 Multiplication Value M/N 4 8 8 Output Frequency (MHz) 106.
25 212.
5 187.
5 BLOCK DIAGRAM FREQ_SEL Pullup PIN ASSIGNMENT ÷3 1 Q nQ VDDA GND XTAL_OUT XTAL_IN 1 2 3 4 8 7 6 5 VDD Q nQ FREQ_SEL XTAL_IN OSC XTAL_OUT Phase Detector VCO 490MHz - 680MHz ÷6 M = ÷24 (fixed) 0 ICS844001I 8-Lead TSSOP 4.
40mm x 3.
0mm x 0.
925mm package body G Package Top View The Preliminary Information presented herein represents a product in prototyping or pre-production.
The noted characteristics are based on initial product characterization.
Integrated Circuit Systems, I...

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