ICS94225

www.DataSheet4U.com Integrated Circuit Systems, Inc. ICS94225 AMD-K7TM System Clock Chip Recommended Application: AMD 750/760 style chipset Output Features: 3 differential pair open drain CPU clocks (1.5V external pull-up; up to 150MHz achieviable through I2C) 2 - AGPCLK @ 3.3V 8 - PCI @3.3V, including 1 free running 1 - 48MHz @ 3.3V 1 - 24/48MHz @ 3.3V 2- REF @3.3V, 14.318MHz. Features: Programmable ouput frequency Programmable ouput rise/fall time Programmable group skew 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 **FS0/REF0 **FS1/REF1 GNDREF X1 X2 GNDPCI PCICLK_F PCICLK0 VDDPCI PCICLK1 PCICLK2 GNDPCI PCICLK3 PCICLK4 VDDPCI PCICLK5 PCICLK6 VDDAGP AGP0 AGP1 GNDAGP VDD48 48MHz SEL24_48#/24-48MHz 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 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 VDDREF GNDSD SDRAM_OUT VDDSD RESERVED CPUCLKC2 CPUCLKT2 GNDCPU CPUCLKC1 CPUCLKT1 GND CPUCLKC0 CPUCLKT0 RESET# VDD GND PCI_STOP# CPU_STOP# PD# SPREAD# FS2* SDATA SCLK GND48 48-Pin 300mil SSOP * Internal 120K pullup resistor on indicated inputs ** Internal 240K pullup resistor on indicated inputs Block Diagram PLL2 /2 X1 X2 XTAL OSC PLL1 Spread Spectrum 48MHz 24_48MHz Functionality FS2 0 0 0 0 1 1 1 1 FS1 0 0 1 1 0 0 1...