ICS94203

www.DataSheet4U.com Integrated Circuit Systems, Inc. ICS94203 Programmable System Frequency Generator for PII/III™ Recommended Application: 810/810E and Solano (815) type chipset Output Features: 2 - CPUs @ 2.5V 13 - SDRAM @ 3.3V 3 - 3V66 @ 3.3V 7 - PCI @3.3V 1 - 24/48MHz@ 3.3V 1 - 48MHz @ 3.3V fixed 1 - REF @3.3V, 14.318MHz Features: Programmable ouput frequency Gear ratio change detection Real time system reset output Spread spectrum for EMI control with programmable spread percentage Watchdog timer technology to reset system if over-clocking causes malfunction. Support power management through PD#. Uses external 14.318MHz crystal FS pins for frequency select Key Specifications: CPU Output Jitter: <250ps IOAPIC Output Jitter: <500ps 48MHz, 3V66, PCI Output Jitter: <500ps CPU Output Skew: <175ps PCI Output Skew: <500ps 3V66 Output Skew <175ps For group skew timing, please refer to the Group Timing Relationship Table. VDDA GNDA X1 X2 GND3V66 VDD3V66 3V66-0 3V66-1 3V66-2 VDDPCI GNDPCI 1 *FS0/PCICLK0 1 *FS1/PCICLK1 1 *SEL24_48#/PCICLK2 GNDPCI VDDPCI PCICLK3 PCICLK4 PCICLK5 PCICLK6 RATIO_0 PD# SCLK SDATA VDD48 GND48 *FS2/24_48MHz 1 *FS3/48MHz Pin Configuration 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 REF/FS4* VDDLAPIC 1 IOAPIC0 VDDLCPU GNDLCPU CPUCLK0 CPUCLK1 GNDSDR VDDSDR SDRAM0 SDRAM1 SDRAM2 SDRAM3 VDDSDR GNDSDR S...