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ICS844004I

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

ICS844004I
ICS844004I

Overview
www.
DataSheet4U.
com PRELIMINARY Integrated Circuit Systems, Inc.
ICS844004I FEMTOCLOCKS™CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER FEATURES • Four LVDS outputs • Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input • Supports the following output frequencies: 212.
5MHz, 187.
5MHz, 159.
375MHz, 156.
25MHz, 106.
25MHz, 53.
125MHz • VCO range: 560MHz - 680MHz • RMS phase jitter @ 212.
5MHz, using a 26.
5625MHz crystal (637KHz - 10MHz): 0.
65ps (typical) • Full 3.
3V or 2.
5V supply modes • -40°C to 85°C ambient operating temperature GENERAL DESCRIPTION The ICS844004I is a 4 output LVDS Synthesizer optimized to generate Fibre Channel reference HiPerClockS™ clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS.
Using a 26.
5625MHz 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL[1:0]): 212.
5MHz, 187.
5MHz, 159.
375MHz, 156.
25MHz, 106.
25MHz and 53.
125MHz.
The ICS844004I uses ICS’ 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting Fibre Channel jitter requirements.
The ICS844004I is packaged in a small 24-pin TSSOP package.
ICS FREQUENCY SELECT FUNCTION TABLE Inputs Input Frequency (MHz) 26.
5625 26.
5625 26.
5625 26.
5625 26.
04166 23.
4375 F_SEL1 F_SEL0 0 0 1 1 0 0 0 1 0 1 1 0 M Divider Value 24 24 24 24 24 24 N Divider Value 3 4 6 12 4 3 M/N Divider Value 8 6 4 2 6 8 Output Frequency (MHz) 212.
5 159.
375 106.
25 53.
125 156.
25 187.
5 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 nc nXTAL_SEL TEST_CLK GND XTAL_IN XTAL_OUT ICS844004I BLOCK DIAGRAM F_SEL[1:0] Pulldown nPLL_SEL Pulldown 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 ÷3 0 1 ÷4 10 11 0 Q2 nQ2 nQ0 Q1 nQ1 TEST_CLK Pulldown 26.
5625MHz 1 XTAL_IN OSC XTAL_OUT nXTAL_SEL Pulld...


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