ICS9248-96

Integrated Circuit Systems, Inc. ICS9248-96 Preliminary Product Preview Frequency Generator & Integrated Buffers for Celeron & PII/III™ Recommended Application: 810/810E type chipset. Output Features: 2- CPUs @ 2.5V, up to 155MHz. 9 - SDRAM @ 3.3V, up to 155MHz including 1 free running 8 - PCICLK @ 3.3V 1 - IOAPIC @ 2.5V, 2 - 3V66MHz @ 3.3V, 2X PCI MHz 2 - 48MHz, @ 3.3V fixed. 1 - 24/48MHz, @3.3V selectable by I2C 1 - REF @v3.3V, 14.318MHz. Features: Up to 157MHz frequency support Support FS0-FS3 strapping status bit for I2C read back. Support power management: Through Power down Mode from I2C programming. Spread spectrum for EMI control ( ± 0.25% center). Uses external 14.318MHz crystal Skew Specifications: CPU – CPU: <175ps SDRAM - SDRAM: < 250ps 3V66 – 3V66: <175ps PCI – PCI: <500ps CPU-SDRAM<500ps For group skew specifications, please refer to group timing relationship. Pin Configuration 48-Pin 300mil SSOP * These inputs have a 120K pull up to VDD. ** 60K pull-up to VDD on indicated input 1 These are double strength. Block Diagram Functionality FS3 FS2 FS1 FS0 CPU (MHz) SDRAM (MHz) 3V66 (MHz) PCICLK (MHz) I OA P I C 1=PCICLK/2 I OA P I C 0=PCICLK (MHz) (MHz) 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 66.80 68.00 100.30 103.00 133.73 145.00 133.73 137.33 140.00 140.00 118.00 124.00 133.70 137.00 150.00 72.50 100.20 102.00 100.30 103.00 1...