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ICS844008-16 Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS844008-16 Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 12 page 844008AY-16 www.icst.com/products/hiperclocks.html REV. A FEBRUARY 1, 2006 1 Integrated Circuit Systems, Inc. ICS844008-16 FEMTOCLOCKS™ CRYSTAL-TO- LVDS FREQUENCY SYNTHESIZER PRELIMINARY GENERAL DESCRIPTION The ICS844008-16 is an 8 output LVDS Synthesizer optimized to generate PCI Express 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 ICS844008-16 uses ICS’ 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting PCI Express jitter requirements. The ICS844008-16 is packaged in a 32-pin LQFP package. 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): 0.44ps (typical) • Full 3.3V supply modes • 0°C to 70°C ambient operating temperature • Available in both standard and lead-free RoHS compliant packages HiPerClockS™ ICS PIN ASSIGNMENT FREQUENCY SELECT FUNCTIONTABLE 32 31 30 29 28 27 26 25 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 Q0 nQ0 VDD Q1 nQ1 GND Q2 nQ2 ICS844008-16 32-Lead LQFP 7mm x 7mm x 1.4mm package body Y Package Top View Q7 nQ7 VDD Q6 nQ6 GND Q5 nQ5 1 0 Phase Detector VCO 500MHz (w/25MHz Reference) M = ÷20 (fixed) ÷4 ÷5 OSC BLOCK DIAGRAM nPLL_SEL XTAL_IN XTAL_OUT OE1 MR F_SEL OE2 Q0 nQ0 Q1 nQ1 Q2 nQ2 Q3 nQ3 Q4 nQ4 Q5 nQ5 Q6 nQ6 Q7 nQ7 Pullup Pullup 25MHz Pulldown Pullup Pulldown t u p n I t u p t u O y c n e u q e r F ) z H M ( t u p n I y c n e u q e r F ) z H M (L E S _ F r e d i v i D M e u l a V r e d i v i D N e u l a V r e d i v i D N / M e u l a V z H M 5 20 0 24 5 5 2 1 z H M 5 21 0 25 4 0 0 1 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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