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ICS844004I-01

ICS
Part Number ICS844004I-01
Manufacturer ICS
Description CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER
Published Oct 2, 2007
Detailed Description www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844004I-01 FEMTOCLOCKS™CRYSTAL-TOLVDS FREQUENCY ...
Datasheet PDF File ICS844004I-01 PDF File

ICS844004I-01
ICS844004I-01

Overview
www.
DataSheet4U.
com PRELIMINARY Integrated Circuit Systems, Inc.
ICS844004I-01 FEMTOCLOCKS™CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER FEATURES • Four LVDS outputs • Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input • Supports the following output frequencies: 156.
25MHz, 125MHz, 62.
5MHz • VCO range: 560MHz - 680MHz • RMS phase jitter @ 156.
25MHz, using a 25MHz crystal (1.
875MHz - 20MHz): 0.
41ps (typical) • Full 3.
3V or 2.
5V supply modes • -40°C to 85°C ambient operating temperature GENERAL DESCRIPTION The ICS844004I-01 is a 4 output LVDS Synthesizer optimized to generate Ethernet reference clock HiPerClockS™ frequencies and is a member of the HiPerClocks TM family of high performance clock solutions from ICS.
Using a 25MHz 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL[1:0]): 156.
25MHz, 125MHz and 62.
5MHz.
The ICS844004I-01 uses ICS’ 3 rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting Ethernet jitter requirements.
The ICS844004I-01 is packaged in a small 24pin TSSOP package.
ICS FREQUENCY SELECT FUNCTION TABLE F_SEL1 F_SEL0 0 0 1 1 0 1 0 1 M Divider Value 25 25 25 25 N Divider Value 4 5 10 Not Used M/N Divider Value 6.
25 5 2.
5 Output Frequency (25MHz Ref.
) 156.
5 125 62.
5 Not Used PIN ASSIGNMENT nQ1 Q1 VDD o Q0 nQ0 MR nPLL_SEL nc VDDA F_SEL0 VDD F_SEL1 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 nQ2 Q2 VDDO Q3 nQ3 GND VDD nXTAL_SEL TEST_CLK GND XTAL_IN XTAL_OUT ICS844004I-01 BLOCK DIAGRAM F_SEL[1:0] Pulldown nPLL_SEL Pulldown TEST_CLK Pulldown 25MHz 2 24-Lead TSSOP 4.
40mm x 7.
8mm x 0.
92mm package body G Package Top View Q0 1 F_SEL[1:0] 0 0 ÷4 0 1 ÷5 10 11 0 Q2 nQ2 nQ0 Q1 nQ1 1 XTAL_IN OSC XTAL_OUT nXTAL_SEL Pulldown 0 Phase Detector VCO 625MHz (w/25MHz Reference) ÷10 not used M = 25 (fixed) Q3 nQ3 MR Pulldown The Preliminary Information presented herein represents a product in pro...


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