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843004AG-125LF Datasheet(PDF) 1 Page - Integrated Device Technology |
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843004AG-125LF Datasheet(HTML) 1 Page - Integrated Device Technology |
1 / 14 page ADVANCE INFORMATION FemtoClock™ Crystal-to-3.3V LVPECL Frequency Synthesizer ICS843004-125 DATA SHEET ICS843004AG-125 REVISION A JUNE 3, 2009 1 ©2009 Integrated Device Technology, Inc. GENERAL DESCRIPTION The ICS843004-125 is a 4 output LVPECL Syn- thesizer optimized to generate Ethernet reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from IDT. The ICS843004-125 uses IDT’s 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter, easily meeting Ethernet jitter requirements. The ICS843004-125 is packaged in a small 24-pin TSSOP package. FEATURES • Four 3.3V LVPECL output pairs • Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input • Crystal oscillator designed for 25MHz, 18pF parallel resonant crystal • Supports the following output frequency: 125MHz • VCO range: 560MHz - 680MHz • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.58ps (typical) • Full 3.3V supply mode • 0°C to 70°C ambient operating temperature • Available in lead-free (RoHS 6) package HiPerClockS™ ICS PIN ASSIGNMENT ICS843004-125 24-Lead TSSOP 4.40mm x 7.8mm x 0.925mm package body G Package Top View nQ1 Q1 VCCo Q0 nQ0 MR nPLL_SEL nc VCCA nc VCC nc 1 2 3 4 5 6 7 8 9 10 11 12 nQ2 Q2 VCCO Q3 nQ3 VEE VCC nXTAL_SEL REF_CLK VEE XTAL_IN XTAL_OUT 24 23 22 21 20 19 18 17 16 15 14 13 BLOCK DIAGRAM s t u p n I ) z H M ( y c n e u q e r F t u p t u O ) . f e R z H M 5 2 ( e u l a V r e d i v i D Me u l a V r e d i v i D Ne u l a V r e d i v i D N / M 5 25 5 5 2 1 FREQUENCY SELECT FUNCTION TABLE 1 1 0 1 0 Phase Detector VCO 625MHz (w/25MHz Reference) OSC M = 25 (fixed) Q0 nQ0 Q1 nQ1 Q1 nQ1 Q2 nQ2 nQ3 Q3 nPLL_SEL REF_CLK XTAL_IN XTAL_OUT nXTAL_SEL MR Pulldown Pulldown Pulldown Pulldown 25MHz ÷5 |
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