ICS843002I-01

Integrated Circuit Systems, Inc. ICS843002I-01 www.DataSheet4U.com FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER FEATURES Two 3.3V or 2.5V LVPECL outputs Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input Supports the following output frequencies: 156.25MHz, 125MHz and 62.5MHz VCO range: 560MHz - 680MHz RMS phase jitter @ 156.25MHz, using a 25MHz crystal (1.875MHz-20MHz): 0.55ps (typical) Output skew: 30ps (maximum) Supply Voltage Modes Core/Outputs 3.3/3.3 2.5/2.5 -40°C to 85°C ambient operating temperature Available in both standard and lead-free RoHS-compliant packages GENERAL DESCRIPTION The ICS843002I-01 is a 2 output LVPECL synthesizer optimized to generate Ethernet HiPerClockS™ reference clock frequencies and is a member of the HiPerClocks TM family of high performance clock solutions from ICS. Using a 25MHz 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL[1:0]): 156.25MHz, 125MHz, and 62.5MHz. The ICS843002I-01 uses ICS’ FemtoClock TM low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter, easily meeting Ethernet jitter requirements. The ICS843002I-01 is packaged in a small 20-pin TSSOP package. IC S FREQUENCY SELECT FUNCTION TABLE Inputs M Divider F_SEL1 F_SEL0 Value 0 0 25 0 1 1 1 0 1 25 25 25 N Divider Value 4 5 10 5 Output Frequency (25MHz Ref.) 156.25 (default) 125 62.5 12 5 PIN ASSIGNMENT nc VCCO Q0 ...