ICS9248-97

Integrated Circuit Systems, Inc. ICS9248-97 Frequency Timing Generator for PENTIUM II Systems Recommended Application: Camino chipset Output Features: • 3 - CPUs @ 2.5V, up to 180MHz. • 3 - IOAPIC @ 2.5V, PCI/2 • 3 - 3V66MHz @ 3.3V. • 11 - PCIs @ 3.3V • 1 - 48MHz, @ 3.3V fixed • 1 - 24/48MHz, @ 3.3V • 1 - CPU/2, @ 2.5V. Features: • Up to 180MHz frequency support • • • • Support power management: Power down Mode from I2C programming. Spread spectrum for EMI control ± 0.25% center spread). Uses external 14.318MHz crystal FS pins for frequency select Pin Configuration GNDREF REF0 *SEL24_48#/REF1 VDDREF X1 X2 GNDPCI *FS0/PCICLK_F *FS1/PCICLK0 VDDPCI *FS2/PCICLK1 *FS3/PCICLK2 GNDPCI PCICLK3 PCICLK4 VDDPCI PCICLK5 PCICLK6 GNDPCI PCICLK7 PCICLK8 PCICLK9 VDDPCI PD# 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 IOAPIC0 IOAPIC1 GNDLAPIC IOAPIC2 VDDLCPU/2 CPU/2 GNDLCPU/2 CPUCLK0 VDDLCPU CPUCLK1 CPUCLK2 GNDLCPU VDD66 3V66_0 3V66_1 3V66_2 GND66 SDATA SCLK VDD48 48MHz/FS4* 24_48MHz GND48 48-pin SSOP *120K ohm pull-up to VDD on indicated inputs. Key Specifications: • CPU Output Jitter: <250ps • • • • • • • • • • CPU/2 Output Jitter. <250ps IOAPIC Output Jitter: <500ps 48MHz, 3V66, PCI Output Jitter: <500ps Ref Output Jitter. <1000ps CPU Output Skew: <175ps IOAPIC Output Skew <250ps 3V66 Output Skew <250ps CPU to 3V66 Output Offset: 0.0 - 1.5ns (CPU leads) 3V66 to PCI Output Offset: 1.5 - 4...