ICS8430252-45

PRELIMINARY Integrated Circuit Systems, Inc. ICS8430252-45 www.DataSheet4U.com FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER 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 GENERAL DESCRIPTION The ICS8430252-45 is a 2 output LVPECL and LVCMOS/LVTTL Synthesizer optimized to genHiPerClockS™ 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 frequencies 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 meeting Ethernet jitter requirements. The ICS8430252-45 is packaged in a small 16-pin TSSOP package. IC S BLOCK DIAGRAM OE Pullup 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 XTAL_IN XTAL_OUT 2...