ICS844023I

www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844023I FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK GENERATOR FEATURES One Differential LVDS output Crystal oscillator interface, 18pF parallel resonant crystal (24.5MHz - 34MHz) Output frequency range: 245MHz - 340MHz VCO range: 490MHz - 680MHz RMS phase jitter @ 250MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.38ps (typical) 3.3V or 2.5V operating supply -40°C to 85°C ambient operating temperature Available in both standard and lead-free RoHS-compliant packages GENERAL DESCRIPTION The ICS844023I is an Ethernet Clock Generator and a member of the HiPerClocksTM family of high HiPerClockS™ performance devices from ICS. The ICS844023I uses an 18pF parallel resonant crystal over the range of 24.5MHz - 34MHz. For Ethernet applications, a 25MHz crystal is used to generate 250MHz. The ICS844023I has excellent <1ps phase jitter performance, over the 1.875MHz - 20MHz integration range. The ICS844023I is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. IC S COMMON CONFIGURATION TABLE Inputs Crystal Frequency (MHz) 25 M 20 N 2 Multiplication Value M/N 10 Output Frequency (MHz) 250 BLOCK DIAGRAM OE Pullup PIN ASSIGNMENT VDDA GND XTAL_OUT XTAL_IN 1 2 3 4 8 7 6 5 VDD Q nQ OE XTAL_IN OSC XTAL_OUT Phase Detector VCO 490MHz - 680MHz N = ÷2 (fixed) Q nQ ICS844023I 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View M = ÷20 (fixed) The ...