ICS844004I

www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844004I FEMTOCLOCKS™CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER FEATURES Four LVDS outputs Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input Supports the following output frequencies: 212.5MHz, 187.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, 53.125MHz VCO range: 560MHz - 680MHz RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal (637KHz - 10MHz): 0.65ps (typical) Full 3.3V or 2.5V supply modes -40°C to 85°C ambient operating temperature GENERAL DESCRIPTION The ICS844004I is a 4 output LVDS Synthesizer optimized to generate Fibre Channel reference HiPerClockS™ clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS. Using a 26.5625MHz 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL[1:0]): 212.5MHz, 187.5MHz, 159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz. The ICS844004I uses ICS’ 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting Fibre Channel jitter requirements. The ICS844004I is packaged in a small 24-pin TSSOP package. ICS FREQUENCY SELECT FUNCTION TABLE Inputs Input Frequency (MHz) 26.5625 26.5625 26.5625 26.5625 26.04166 23.4375 F_SEL1 F_SEL0 0 0 1 1 0 0 0 1 0 1 1 0 M Divider Value 24 24 24 24 24 24 N Divider Value 3 4 6 12 4 3 M/N Divider Value 8 6 4 2 6 8 Output Frequency (MHz) 212.5 159....