ICS843204I

www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS843204I FEMTOCLOCKS™ CRYSTAL-TO3.3V LVPECL FREQUENCY SYNTHESIZER FEATURES Four 3.3V LVPECL outputs Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input Supports the following output frequencies: 155.52MHz and 156.25MHz VCO range: 560MHz - 680MHz RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal (12kHz - 13MHz): 0.86ps (typical) RMS phase jitter @ 156.25MHz, using a 19.44MHz crystal (1.875MHz - 20MHz): 0.52ps (typical) Full 3.3V supply mode -40°C to 85°C ambient operating temperature Available in both standard and lead-free RoHS compliant packages GENERAL DESCRIPTION The ICS843204I is a 4 output LVPECL Synthesizer optimized to generate Gigabit HiPerClockS™ Ethernet and SONET reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS. Using a 19.44MHz and 25MHz, 18pF parallel resonant crystal, 155.52MHz and 156.25MHz frequencies can be generated. The ICS843204I uses ICS’ FemtoClock TM low phase noise VCO technology and can achieve 1ps or lower typical RMS phase jitter. The ICS843204I is packaged in a 48-pin TSSOP package. IC S BLOCK DIAGRAM PLL_BYPASS_A IN_SELA CLK0 XTAL_IN0 25MHz SELA0 OEA0 PIN ASSIGNMENT nQA1 QA1 nQA0 QA0 nc VCCO _A SELA1 SELA0 PLL_BYPASS_A nc nc nc nc XTAL_IN1 XTAL_OUT1 CLK1 IN_SEL_B PLL_BYPASS_B VCCO _B nc QB0 nQB0 QB1 nQB1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23...