ICS9248-128

Integrated Circuit Systems, Inc. ICS9248-128 Frequency Generator & Integrated Buffers Recommended Application: SIS 530/620 style chipset Output Features: - 3 CPU @ 2.5V/3.3V up to 133.3 MHz. - 6 PCI @ 3.3V (including 1 free-running) - 13 SDRAMs @ 3.3V up to 133.3MHz. - 3 REF @ 3.3V, 14.318MHz - 1 clock @ 24/14.3 MHz selectable output for SIO - 1 Fixed clock at 48MHz (3.3V) - 1 IOAPIC @ 2.5V / 3.3V Features: Up to 133MHz frequency support Support power management: CPU, PCI, SDRAM stop and Power down Mode from I2C programming. Spread spectrum for EMI control ( ± 0.25% center spread & 0 to -0.5% down spread). Uses external 14.318MHz crystal FS pins for frequency select Key Specifications: CPU – CPU<175ps SDRAM – SDRAM < 350ps CPU–SDRAM < 500ps CPU(early) – PCI : 1-4ns (typ. 2ns) PCI – PCI <500ps Pin Configuration VDDR/X *MODE/REF0 GNDREF X1 X2 VDDPCI *FS1/PCICLK_F *FS2.PCICLK0 GNDPCI PCICLK1 PCICLK2 PCICLK3 PCICLK4 VDDPCI SDRAM12 GNDSDR *CPU_STOP# /SDRAM11 *PCI_STOP# /SDRAM10 VDDSD/C *SDRAM_STOP# /SDRAM9 *PD# /SDRAM8 GNDFIX 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 VDDLAPIC IOAPIC REF1/SD_SEL#* GNDLAPIC REF2/CPU2.5_3.3#* CPUCLK1 VDDLCPU CPUCLK2 CPUCLK3 GNDCPU SDRAM0 SDRAM1 VDDSDR SDRAM2 SDRAM3 GNDSDR SDRAM4 SDRAM5 VDDSDR SDRAM6 SDRAM7 GNDSDR 48MHz/FS0* SIO/SEL24_14#MHz* 48-Pin SSOP * Internal Pull-up Resistor of 120K to 3.3V on indicated i...