ICS94228

www.DataSheet4U.com Integrated Circuit Systems, Inc. ICS94228 Programmable System Clock Chip for AMD - K7™ processor Recommended Application: VIA KT266 style chipset Output Features: 1 - Differential pair open drain CPU clocks @ 2.7V 1 - Differential pair push-pull CPU clocks @ 2.5V 11 - PCI including 1 free running and 1 early @ 3.3V 1 - 48MHz, @ 3.3V fixed 1 - 24/48MHz @ 3.3V 3 - REF @ 3.3V, 14.318MHz. Features: Programmable output frequency. Programmable output rise/fall time. Programmable slew and skew control for CPUCLK, PCICLK, AGP, REF, 48MHz and 24_48MHz. Real time system reset output. Spread spectrum for EMI control typically by 7dB to 8dB, with programmable spread percentage. Watchdog timer technology to reset system if over-clocking causes malfunction. Uses external 14.318MHz crystal. Skew Specifications: CPU - CPU: <200ps PCI - PCI: <500ps CPU (early - PCI: min=1.0ns, max=2.6ns CPU cycle to cycle jitter: <250ps Pin Configuration VDDREF GND X1 X2 AVDD48 *FS2/48MHz *FS3/24_48MHz GND PCICLK_F *SEL24_48#/PCICLK0 PCICLK1 GND PCICLK2 PCICLK3 VDDPCI PCICLK4 PCICLK5 PCICLK6 GND PCICLK7 PCILCK8 PCICLK9_E VDDPCI SRESET# 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 REF0/FS0* REF1/FS1* REF_F REF_STOP#* AGP_STOP#* GND CPUCLKT0 CPUCLKC0 VDDL CPUCLK_CST0 CPUCLK_CSC0 GND CPU_STOP#* PCI_STOP#* PD#* AVDD AGND SDATA SCLK GND AGP2 AGP1 AGP0 VDDAGP 48-Pin 30...