ICS9250-22

Integrated Circuit Systems, Inc. ICS9250-22 Frequency Generator for P IV™ Recommended Application: P IV Chipset Support Output Features: 4 Differential CPU Clock Pairs @ 3.3V 2 - 3V MREF clocks for memory reference seeds, (separate single ended but 180 degrees out of phase) 4 - 66MHz reference output 10 - 3V 33MHz PCI clocks 2 - 48MHz clocks 2 - 14.318 reference output Features: Support power management: Power Down Mode Supports Spread Spectrum modulation: 0 to -0.5% down spread. Uses external 14.318MHz crystal Select logic for Differential Swing Control, Test mode, Tristate, Power down, Spread Spectrum, limited frequency select, selective clock enable. External resistor for current reference FS pins for frequency select Key Specifications: 3V66 Output jitter <300ps CPU Output Jitter <200ps MREF Output jitter <250ps Pin Configuration GND MULTSEL0/REF MULTSEL1/REF VDDREF X1 X2 GNDREF PCICLK0 PCICLK1 VDDPCI PCICLK2 PCICLK3 GNDPCI PCICLK4 PCICLK5 VDDPCI PCICLK6 PCICLK7 GNDPCI PCICLK8 PCICLK9 VDDPCI SEL100/133 GND48 FS0/48MHz FS1/48MHz VDD48 PD# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 VDDMREF 3VMREF 3VMREF_B GNDMREF SPREAD# CPUCLKST3 CPUCLKSC3 VDDCPU CPUCLKST2 CPUCLKSC2 GNDCPU CPUCLKST1 CPUCLKSC1 VDDCPU CPUCLKST0 CPUCLKSC0 GNDCPU I REF VDDA GNDA VDD3V66 3V66-3 3V66-2 GND3V66 GND3V66 3V66-1 3V66-0 VDD3V66 56-Pin 300mil SSOP & TSSO...