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ICS8430252CG-45LFT Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS8430252CG-45LFT Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 13 page 8430252CG-45 www.icst.com/products/hiperclocks.html REV. B DECEMBER 9, 2005 1 Integrated Circuit Systems, Inc. ICS8430252-45 FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER PRELIMINARY GENERAL DESCRIPTION The ICS8430252-45 is a 2 output LVPECL and LVCMOS/LVTTL Synthesizer optimized to gen- erate Ethernet reference clock frequencies and is a member of the HiPerClocks™ family of high performance clock solutions from ICS. Using a 25MHz, 18pF parallel resonant crystal, the following fre- quencies can be generated: 156.25MHz LVPECL output and, 125MHz LVCMOS output. The 8430252-45 uses ICS’ 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter, easily meet- ing Ethernet jitter requirements. The ICS8430252-45 is packaged in a small 16-pin TSSOP package. FEATURES • One differential 3.3V LVPECL output and One LVCMOS/LVTTL output • Crystal oscillator interface designed for a 25MHz, 18pF parallel resonant crystal • A 25MHz crystal generates both an output frequency of 156.25MHz (LVPECL) and 125MHz (LVCMOS) • VCO frequency: 625MHz • RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz) using a 25MHz crystal: 0.39ps (typical) • Full 3.3V supply mode • 0°C to 70°C ambient operating temperature • Industrial temperature available upon request • Available in both standard and lead-free RoHS compliant packages HiPerClockS™ ICS BLOCK DIAGRAM XTAL_IN XTAL_OUT QA QB nQB PIN ASSIGNMENT OE VEE QA VCCO_A nc nc VCCA VCC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CLK_EN VEE QB nQB VCCO_B XTAL_IN XTAL_OUT VEE ICS8430252-45 16-Lead TSSOP 4.4mm x 5.0mm x 0.92mm package body G Package Top View OSC Phase Detector VCO 625MHz Feedback Divider ÷25 ÷4 ÷5 25MHz CLK_EN OE Pullup Pullup 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, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice. |
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