ICS844008I-15

www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844008I-15 FEMTOCLOCKS™ CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER FEATURES Eight LVDS outputs Crystal oscillator interface Supports the following output frequencies: 100MHz or 125MHz VCO: 500MHz RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.42ps (typical) Full 3.3V supply modes -40°C to 85°C ambient operating temperature Available in both standard and lead-free RoHS compliant packages GENERAL DESCRIPTION The ICS844008I-15 is an 8 output LVDS Synthesizer optimized to generate PCI Express HiPerClockS™ reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS. Using a 25MHz parallel resonant crystal, the following frequencies can be generated based on F_SEL pin: 100MHz or 125MHz. The ICS844008I-15 uses ICS’ 3rd generation low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting PCI Express jitter requirements. The ICS844008I-15 is packaged in a 32-pin LQFP package. IC S FREQUENCY SELECT FUNCTION TABLE Input Input Frequency (MHz) 25MHz 25MHz M Divider Value 20 20 N Divider Value 4 5 M/N Divider Value 5 4 Output Frequency (MHz) 12 5 100 PIN ASSIGNMENT XTAL_OUT nPLL_SEL XTAL_IN V DDA GND OE1 OE2 VDD F_SEL 0 1 32 31 30 29 28 27 26 25 Q0 nQ0 VDD Q1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 F_SEL Q3 nQ3 VDD GND Q4 nQ4 MR 24 Q7 nQ7 VDD Q6 nQ6 GND Q5 nQ5 ICS844008I-15 32-Lead LQFP ...