ICS9248-151

Integrated Circuit Systems, Inc. ICS9248-151 Frequency Generator & Integrated Buffers for Celeron & PII/III™ Recommended Application: VIA Apollo Pro 266 style chipset. Output Features: 3 - CPUs @ 2.5V, up to 200MHz. 3 - IOAPIC @ 2.5V, ½ PCI frequency 9 - PCI @ 3.3V, 1 - 48MHz, @ 3.3V fixed. 1 - 24/48MHz @ 3.3V 2 - REF @ 3.3V, 14.318MHz. 3 - AGP @ 3.3V Features: Up to 200MHz frequency support Support power management: PCI, CPU stop and Power Down. Spread spectrum for EMI control (0 to -0.5%, ± 0.25%). Uses external 14.318MHz crystal Skew Specifications: CPU – CPU: <175ps PCI – PCI: <500ps CPU(early)-PCI: Min=1.0ns, Max=2.5ns CPU Cycle to cycle jitter: < 250ps Pin Configuration VDDREF GND X1 X2 AVDD48 *FS3/48MHz *FS2/24_48MHz GND PCICLK_F PCICLK0 PCICLK1 GND PCICLK2 PCICLK3 VDDPCI PCICLK4 PCICLK5 PCICLK6 GND PCICLK7 *FS1 *FS0 AGPCLK0 VDDAGP 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 REF0 REF1/FS4* VDDLAPIC IOAPIC0 IOAPIC1 GND IOAPIC2 VDDLCPU GND CPUCLK0 CPUCLK1 VDDLCPU GND CPUCLK2/F CPU_STOP#* PCI_STOP#* PD* AVDD GND SDATA SCLK AGPCLK2 AGPCLK1 GND 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 FS4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 FS3 FS2 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 FS1 FS0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0...