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ICS844008I-15

ICS
Part Number ICS844008I-15
Manufacturer ICS
Description CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER
Published Oct 2, 2007
Detailed Description www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844008I-15 FEMTOCLOCKS™ CRYSTAL-TOLVDS FREQUENCY...
Datasheet PDF File ICS844008I-15 PDF File

ICS844008I-15
ICS844008I-15

Overview
www.
DataSheet4U.
com PRELIMINARY Integrated Circuit Systems, Inc.
ICS844008I-15 FEMTOCLOCKS™ CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER FEATURES • Eight LVDS outputs • Crystal oscillator interface • Supports the following output frequencies: 100MHz or 125MHz • VCO: 500MHz • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.
875MHz - 20MHz): 0.
42ps (typical) • Full 3.
3V supply modes • -40°C to 85°C ambient operating temperature • Available in both standard and lead-free RoHS compliant packages GENERAL DESCRIPTION The ICS844008I-15 is an 8 output LVDS Synthesizer optimized to generate PCI Express HiPerClockS™ reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS.
Using a 25MHz parallel resonant crystal, the following frequencies can be generated based on F_SEL pin: 100MHz or 125MHz.
The ICS844008I-15 uses ICS’ 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting PCI Express jitter requirements.
The ICS844008I-15 is packaged in a 32-pin LQFP package.
IC S FREQUENCY SELECT FUNCTION TABLE Input Input Frequency (MHz) 25MHz 25MHz M Divider Value 20 20 N Divider Value 4 5 M/N Divider Value 5 4 Output Frequency (MHz) 12 5 100 PIN ASSIGNMENT XTAL_OUT nPLL_SEL XTAL_IN V DDA GND OE1 OE2 VDD F_SEL 0 1 32 31 30 29 28 27 26 25 Q0 nQ0 VDD Q1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 F_SEL Q3 nQ3 VDD GND Q4 nQ4 MR 24 Q7 nQ7 VDD Q6 nQ6 GND Q5 nQ5 ICS844008I-15 32-Lead LQFP 7mm x 7mm x 1.
4mm package body Y Package Top View 23 22 21 20 19 18 17 BLOCK DIAGRAM nPLL_SEL Pulldown nQ1 Q0 nQ0 Q1 GND Q2 nQ2 1 XTAL_IN 25MHz nQ1 Q2 OSC XTAL_OUT Phase Detector VCO 500MHz (w/25MHz Reference) 0 ÷4 ÷5 nQ2 Q3 nQ3 M = ÷20 (fixed) OE1 Pullup Q4 nQ4 Q5 nQ5 Q6 nQ6 Q7 MR Pulldown F_SEL OE2 Pullup Pullup nQ7 The Preliminary Information presented herein represents a product in prototyping or pre-production.
The noted characteristics are based on initial product character...


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