ICS840004I Datasheet | Integrated Circuit Systems

PRELIMINARY Integrated Circuit Systems, Inc. FEMTOCLOCKS™CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER Features - Four LVCMOS/LVTTL outputs, 15Ω typical output impedance - Selectable crystal oscillator interface or LVCMOS single-ended input - Supports the following input frequencies: 212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz - RMS phase jitter @ 212.5MHz(2.55MHz - 20MHz): 0.49ps (typical) - Output supply modes: Core/Output 3.3V/3.3V 3.3V/2.5V 2.5V/2.5V - -40°C to 85°C ambient operating temperature GENERAL DESCRIPTION The ICS840004I is a 4 output LVCMOS/LVTTL Synthesizer optimized to generate Fibre Channel Hi Per Clock S™ reference clock frequencies and is a member of the Hi Per Clocks TM family of high performance clock solutions from ICS. Using a 26.5625MHz, 18p F parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL1:0): 212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and 53.125MHz. The ICS840004I uses ICS’ 3rd generation low phase .. noise VCO technology and can achieve 1ps or lower typical random rms phase jitter, easily meeting Fibre Channel jitter requirements. The ICS840004I is packaged in a small 20-pin TSSOP package. FREQUENCY SELECT FUNCTION TABLE Input Frequency (MHz) 26.5625 26.5625 26.5625 26.5625 26.04166 Inputs M Divider F_SEL0 Value 0 24 1 0 1 1 24 24 24 24 N Divider Value 3 4 6 12 4 M/N Ratio Value 8 6 4 2 6 Output Frequency Range (MHz) 212.5 159.375 106.25 53.125 156.25 F_SEL1 0 0 1 1 0 BLOCK DIAGRAM OE Pullup F_SEL1:0 Pullup:Pullup n PLL_SEL Pulldown n XTAL_SEL Pulldown PIN ASSIGNMENT F_SEL0 nc n XTAL_SEL TEST_CLK OE MR n PLL_SEL VDDA nc VDD 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 F_SEL1 GND Q0 Q1 VDDO Q2 Q3 GND XTAL_IN XTAL_OUT XTAL_IN 26.5625MHz XTAL_OUT TEST_CLK Pulldown F_SEL1:0 1 Phase Detector 00 01 10 11 Q0 N ÷3 ÷4 ÷6 ÷12 (default) Q1 20-Lead TSSOP 6.5mm x 4.4mm x 0.92mm package...