ICS9248-126

Integrated Circuit Systems, Inc. ICS9248-126 Frequency Generator & Integrated Buffers for Celeron & PII/III™ & K6 Recommended Application: Motherboard Single chip clock solution for Pentium II/III and K6 processors, using SIS540/SIS630 style chipset. Output Features: 3- CPUs @ 2.5/3.3V, up to 166MHz. 14 - SDRAM @ 3.3V 7- PCI @3.3V, 1- 48MHz, @3.3V fixed. 1- 24/48MHz, @3.3V selectable by I2C (Default is 24MHz). 2- REF @3.3V, 14.318MHz. Features: Up to 166MHz frequency support Support FS0-FS3 trapping status bit for I2C read back. Support power management: CPU, PCI, SDRAM stop and Power down Mode form I2C programming. Spread spectrum for EMI control (0 to -0.5%, ± 0.25%). FS0, FS1, FS3 must have a internal 120K pull-Down to GND. Uses external 14.318MHz crystal Skew Specifications: CPU - CPU: < 175ps SDRAM - SDRAM < 500ps PCI - PCI: < 500ps CPU - SDRAM: < 500ps CPU - PCI: 1 - 4ns Pin Configuration VDDREF 1 * REF0/FS3 GND X1 X2 VDDPCI *PCICLK0/FS1 *PCICLK1/FS2 PCICLK2 GND PCICLK3 PCICLK4 PCICLK5 PCICLK6 VDDSDR GND SDRAM0 SDRAM1 VDDSDR SDRAM2 SDRAM3 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 VDDLCPU CPUCLK0 CPUCLK1 GND CPUCLK2 VDDSDR SDRAM13 SDRAM12 GND SDRAM11 SDRAM10 VDDSDR SDRAM9 SDRAM8 GNDSDR SDRAM7 SDRAM6 VDDSDR SDRAM5 SDRAM4 VDDSDR 1 48MHz/FS0* 24_48MHz/CPU2.5_3.3#* 48-Pin 300mil SSOP * These inputs have a 120K pull down to GND...