ICS843004I-01

Integrated Circuit Systems, Inc. ICS843004I-01 www.DataSheet4U.com FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER FEATURES Four 3.3V 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 Output skew: 50ps (maximum) RMS phase jitter @ 156.25MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.54ps (typical) Full 3.3V or 2.5V supply modes -40°C to 85°C ambient operating temperature Lead-Free fully RoHS compliant GENERAL DESCRIPTION The ICS843004I-01 is a 4 output LVPECL synthesizer optimized to generate Ethernet HiPerClockS™ reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS. Using a 25MHz 18pF parallel resonant crystal, the following frequencies can be generated based on the settings of 2 frequency select pins (F_SEL[1:0]): 156.25MHz, 125MHz, 62.5MHz. The ICS843004I-01 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 ICS843004I-01 is packaged in a small 24-pin TSSOP package. ICS FREQUENCY SELECT FUNCTION TABLE Inputs M Divider N Divider Value Value 25 4 25 25 25 5 10 not used M/N Divider Value 6.25 5 2.5 Output Frequency (25MHz Ref.) 156.25 125 62.5 not used PIN ASSIGNMENT nQ1 Q1 VCCo Q0 nQ0 MR nPLL_SEL nc VCCA F_SEL0 VCC F_SEL1 1 2 3...