ICS94235

www.DataSheet4U.com Integrated Circuit Systems, Inc. ICS94235 Programmable System Clock Chip for AMD - K7™ processor Recommended Application: ALI 1647 style chipset Output Features: 1 - Differential pair open drain CPU clocks 1 - Single-ended open drain CPU clock 13 - SDRAM @ 3.3V 7 - PCI @ 3.3V 2 - AGP @ 3.3V 1 - 48MHz, @3.3V 1 - REF @ 3.3V, (selectable strength) through I2C Features: Programmable ouput frequency Programmable ouput rise/fall time Programmable CPU, SDRAM, PCI and AGP 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 Skew Specifications: CPUT - CPUC: <250ps PCI - PCI: <500ps CPU - SDRAM: <350ps SDRAM - SDRAM: <250ps AGP - AGP: <250ps AGP - PCI: <750ps CPU - PCI: <3ns Pin Configuration RESET# *PD# GND X1 X2 AVDD **FS0/REF0 VDD **FS1/AGP0 AGP1 GND *FS2/PCICLK_F PCICLK0 PCICLK1 PCICLK2 GND VDD *MODE/PCICLK3 PCICLK4 PCICLK5 AVDD48 **FS3/48MHz GND SCLK 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 GND CPUCLKT0 CPUCLKC0 CPUCLKT1 SDATA SDRAM0 SDRAM1 GND VDD SDRAM2 SDRAM3 SDRAM4 SDRAM5 VDD GND SDRAM6 SDRAM7 SDRAM8 SDRAM9 GND VDD SDRAM10(PCI_STOP#)* SDRAM11 SDRAM12 48-Pin 300mil SSOP & 240mil TSSOP package Notes: REF0 could be 1X or 2X strength contro...