ICS840008-01

PRELIMINARY Integrated Circuit Systems, Inc. ICS840008-01 FEMTOCLOCKS™CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY SYNTHESIZER FEATURES Eight LVCMOS/LVTTL outputs, 15Ω typical output impedance Output frequency range: 125MHz - 160MHz Crystal oscillator interface, 25MHz - 32MHz crystal VCO range: 500MHz - 640MHz RMS phase jitter (1.875MHz - 20MHz): 0.52ps (typical) Output skew: 150ps (maximum) (design target) Voltages supply modes: Core/Output 3.3V/3.3V 3.3V/2.5V 3.3V/1.8V 2.5V/2.5V 2.5V/1.8V 0°C to 70°C ambient operating temperature Industrial temperature information available upon request GENERAL DESCRIPTION The ICS840008-01 is an 8 output LVCMOS/LVTTL Synthesizer designed to generate 125MHz for HiPerClockS™ Gigabit Ethernet applications and is a member of the HiPerClocksTM family of high performance clock solutions from ICS. The ICS840008-01 uses ICS’ 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical random rms phase jitter, easily meeting Gigabit Ethernet jitter requirements. The ICS840008-01 is www.DataSheet4U.com packaged in a small 24-pin SSOP package. ICS BLOCK DIAGRAM nPLL_SEL Pulldown PIN ASSIGNMENT VDDO nc XTAL_OUT XTAL_IN VDDA OE MR nPLL_SEL VDD nc GND nc 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 Q0 Q1 GND Q2 Q3 VDDO Q4 Q5 GND Q6 Q7 VDDO 25MHz XTAL_IN 1 Phase Detector VCO 500MHz 640MHz ÷4 (fixed) OSC XTAL_OUT 0 8 8 Q0:Q7 ÷20 (fixed) ICS840008-01 24-Lead SSOP, 150MIL 3.9mm x 8.65mm x 1.5mm p...