ICS840014I

PRELIMINARY Integrated Circuit Systems, Inc. ICS840014I FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER FEATURES Four LVCMOS/LVTTL outputs, 15Ω typical output impedance Selectable crystal oscillator interface or LVCMOS single-ended input Output frequency: 106.25MHz or 53.125MHz RMS phase jitter @ 106.25MHz (637KHz - 5MHz): 0.72ps (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 ICS840014I is a 4 output LVCMOS/LVTTL Synthesizer optimized to generate Fibre Channel HiPerClockS™ reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS. This device uses a 26.5625MHz, 18pF parallel resonant crystal to synthesize 106.25MHz. Using FemtoClock’sTM ultra-low phase noise VCO technology, the ICS840014I can achieve 1ps or lower typical random rms phase jitter, easily meeting Fibre Channel jitter www.DataSheet4U.com requirements. The ICS840014I is packaged in a small 20-pin TSSOP package. ICS FREQUENCY SELECT FUNCTION TABLE Input Frequency 26.5625 26.5625 Inputs M Divider N Divider F_SEL1 Value Value 0 24 6 1 24 12 M/N Ratio Value 4 2 Output Frequency Range 106.25 53.125 BLOCK DIAGRAM OE Pullup F_SEL Pullup nPLL_SEL Pulldown nXTAL_SEL Pulldown PIN ASSIGNMENT F_SEL nc nXTAL_SEL TEST_CLK OE MR nPLL_SEL VDDA nc VDD 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 nc GND Q0 Q1 VDDO Q2 Q3 GND XTAL_IN XTAL_OUT XTAL_...