ICS844004I-01

www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844004I-01 FEMTOCLOCKS™CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER FEATURES Four LVDS outputs Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input Supports the following output frequencies: 156.25MHz, 125MHz, 62.5MHz VCO range: 560MHz - 680MHz RMS phase jitter @ 156.25MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.41ps (typical) Full 3.3V or 2.5V supply modes -40°C to 85°C ambient operating temperature GENERAL DESCRIPTION The ICS844004I-01 is a 4 output LVDS Synthesizer optimized to generate Ethernet reference clock HiPerClockS™ 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 ICS844004I-01 uses ICS’ 3 rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting Ethernet jitter requirements. The ICS844004I-01 is packaged in a small 24pin TSSOP package. ICS FREQUENCY SELECT FUNCTION TABLE F_SEL1 F_SEL0 0 0 1 1 0 1 0 1 M Divider Value 25 25 25 25 N Divider Value 4 5 10 Not Used M/N Divider Value 6.25 5 2.5 Output Frequency (25MHz Ref.) 156.5 125 62.5 Not Used PIN ASSIGNMENT nQ1 Q1 VDD o Q0 nQ0 MR nPLL_SEL nc VDDA F_SEL0 VDD F_SEL1 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 nQ2 Q2 VDD...