ICS950508

Integrated Circuit Systems, Inc. ICS950508 Programmable Timing Control Hub™ for PII/III™ Recommended Application: 810/810E/815 and 815 B-Step type chipset Output Features: 2 - CPUs @ 2.5V 13 - SDRAM @ 3.3V 3 - 3V66 @ 3.3V 8 - PCI @3.3V 1 - 24/48MHz@ 3.3V 1 - 48MHz @ 3.3V fixed 1 - REF @3.3V, 14.318MHz Features/Benefits: Programmable output frequency. Programmable output divider ratios. Programmable output rise/fall time. Programmable output skew. Programmable spread percentage for EMI control. Watchdog timer technology to reset system if system malfunctions. Programmable watch dog safe frequency. Support I2C Index read/write and block read/write operations. Uses external 14.318MHz crystal. Key Specifications: CPU Output Jitter: <250ps IOAPIC Output Jitter: <500ps 48MHz, 3V66, PCI Output Jitter: <500ps Ref Output Jitter. <1000ps CPU Output Skew: <175ps PCI Output Skew: <500ps 3V66 Output Skew <175ps For group skew timing, please refer to the Group Timing Relationship Table. VDDREF X1 X2 GND GND 3V66_0 3V66_1 3V66_2 VDD3V66 VDDPCI 1 *FS0/PCICLK0 1 *FS1/PCICLK1 1 *SEL24_48#/PCICLK2 GND PCICLK3 PCICLK4 PCICLK5 VDDPCI PCICLK6 PCICLK7 GND Vtt_PWRGD/PD# SCLK SDATA VDDSDR SDRAM11 SDRAM10 GND 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 REF0/FS4 * VDDLAPIC IOAPIC VDDLCPU CPUCLK0 CPUCLK1 GND GND SDRAM0 SDR...