ICS9248-131 Datasheet | Integrated Circuit Systems

Integrated Circuit Systems, Inc. Frequency Generator & Integrated Buffers for Celeron & PII/III™ Remended Application: ALI - Aladdin V™ - mobile style chipsets Output Features : • 3 - CPUs @ 2.5/3.3V, up to 100MHz. • 3 - AGPCLK @ 3.3V • 13 - SDRAM @ 3.3V • 6 - PCI @ 3.3V • 1 - 48MHz, @ 3.3V fixed. • 1 - REF @ 3.3V, 14.318MHz. Features : • Support power management: CPU, PCI, AGP stop and Power down Mode from I2C programming. • Spread spectrum for EMI control. • Uses external 14.318MHz crystal • FS pins for frequency select Key Specifications: • CPU – CPU: <250ps • AGP – PCI: <550ps • CPU(early)-PCI: 1-4ns, Center 2-6ns Pin Configuration VDDF - REF0/CPU2.5_3.3# GND X1 X2 VDDPCI - PCICLK_F/FS1 - PCICLK0/FS2 GND PCICLK1 PCICLK2 PCICLK3 PCICLK4 VDDA BUFFERIN GND - CPU_STOP#/SDRAM11 - PCI_STOP#/SDRAM10 VDDSDR - AGP_STOP#/SDRAM9 - PD#/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 VDDAGP AGP0 AGP1 GND CPUCLK0 CPUCLK1 VDDL CPUCLK2 SDRAM12 GND SDRAM0 SDRAM1 VDDSDR SDRAM2 SDRAM3 GND SDRAM4 SDRAM5 VDDSDR SDRAM6 SDRAM7 GND 48MHz/FS0- AGP_F/MODE- 48-Pin SSOP Block Diagram PLL2 48MHz - Internal Pull-up Resistor of 240K to 3.3V on indicated inputs Functionality FS2 FS1 1 1 0 0 1 1 0 0 FS0 1 0 1 0 1 0 1 0 CPU, SDRA M (MHz) 100 95.25 83.3 97 91.5 96.22 66.67 60 PCI (MHz) 33.33 31.75 33.30 32.33 30.50 32.07 33.33 30.00 AGP (MHz) 66.67 63.50 66.60 64.66 61.00 64.15 66.67 60.00 1 1 1 1 0 0 0 0 X1 X2 XTAL OSC PLL1 Spread...