ICS9248-114

Integrated Circuit Systems, Inc. ICS9248-114 AMD - K7™ System Clock Chip Recommended Application: VIA K7 style chipset Output Features: 1 - Differential pair open drain CPU clocks 1 - Single-ended open drain CPU clock 13 - SDRAM @ 3.3V 6 - PCI @3.3V, 1 - 48MHz, @3.3V fixed. 1 - 24/48MHz @ 3.3V 2 - REF @3.3V, 14.318MHz. Features: Up to 155MHz frequency support Support power management: CPU stop and Power down Mode from I2C programming. Spread spectrum for EMI control (0 to -0.5% down spread, ± 0.25% center spread). Uses external 14.318MHz crystal Skew Specifications: CPUT – CPUC: <200ps PCI – PCI: <500ps CPU – PCI: <500ps Pin Configuration VDD1 REF0/CPU_STOP#* GND X1 X2 VDD2 *MODE/PCICLK_F *FS3/PCICLK0 GND *SEL24_48#/PCICLK1 PCICLK2 PCICLK3 PCICLK4 VDD2 BUFFER IN GND SDRAM11 SDRAM10 VDD3 SDRAM9 SDRAM8 GND SDATA 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 REF1/FS2* GND CPUCLKT1 GND CPUCLKC0 CPUCLKT0 VDDL PD#* SDRAM_OUT GND SDRAM0 SDRAM1 VDD3 SDRAM2 SDRAM3 GND SDRAM4 SDRAM5 VDD3 SDRAM6 SDRAM7 VDD4 48MHz/FS0* 24/48MHz/FS1* 48-Pin 300mil SSOP * Internal Pull-up Resistor of 120K to VDD Block Diagram PLL2 /2 X1 X2 XTAL OSC PLL1 Spread Spectrum 48MHz 24_48MHz Functionality FS3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 FS2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 FS1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 FS0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 CPU (MHz) 124.00 75.00 83.30 66.80 103.00 ...