ICS950901

Integrated Circuit Systems, Inc. ICS950901 Programmable Timing Control Hub™ for P4™ Recommended Application: VIA P4X266 chipset with PC133 or DDR memory. Output Features: 2 - Pair of differential CPU clocks @ 3.3V 1 - Pair of differential push pull CPU_CS clocks @ 2.5V 3 - AGP @ 3.3V 9 - PCI @ 3.3V 2 - IOAPIC @ 2.5V 1 - 48MHz @ 3.3V fixed 1 - 24_48MHz @ 3.3V 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. For DDR and or PC133 SDRAM system use ICS93718 as the memory buffer. Uses external 14.318MHz crystal. Key Specifications: CPU_CS - CPU0: <±250ps CPU_CS - AGP: <±250ps PCI - PCI: <500ps CPU - PCI: Min = 1.0ns, Typ = 2.0ns, Max = 4.0ns Pin Configuration 1 *SEL24_48/REF VDDREF GND X1 X2 VDD48 **FS3/48MHz **FS2/24_48MHz GND *FS0/PCICLK_F **FS1/PCICLK0 PCICLK1 GND PCICLK2 PCICLK3 VDDPCI PCICLK4 PCICLK5 PCICLK6 GND PCICLK7 *PD# AGPCLK0 VDDAGP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 VDDAPIC (2.5V) GND IOAPIC0 IOAPIC1 GND VDDCPU_CS (2.5V) CPUCLKT_CS CPUCLKC_CS CPUCLKT_0 CPUCLKC_0 VDDCPU (3.3V) I REF GND CPUCL...