ICS9248-143 Datasheet | Integrated Circuit Systems

Integrated Circuit Systems, Inc. Frequency Generator & Integrated Buffers for PENTIUM II/IIITM & K6 Remended Application: 440BX, MX, VIA Apollo Pro 133, Apollo Pro Media or MVP4 style chip set, for Note book applications. Output Features : • 4 - CPUs @ 2.5V/3.3V including 1 free running CPUCLK_F • 9 - SDRAM @ 3.3V • 7 - PCI @ 3.3V, including 1 free running PCICLK_F • 1 - PCI Early @ 3.3V • 1 - 48MHz, @ 3.3V fixed. • 1 - 24/48MHz @ 3.3V • 2 - REF @3.3V, 14.318MHz. Features : • Up to 137MHz frequency support • 97MHz to support high-end AMD processor. • Support power management: CLK, PCI, stop and Power down Mode from I2C programming. • Spread spectrum for EMI control (±.25% & 0 to -0.5% down spread). • Uses external 14.318MHz crystal • FS pins for frequency select Key Specifications: • CPU Output Jitter @ 2.5V: <300ps • CPU Output Jitter @ 3.3V: <250ps • PCI Output Jitter @ 3.3V: <250ps • CPU Output Skew @ 2.5V: <175ps • CPU Output Skew @ 3.3V: <175ps • PCI Output Skew @ 3.3V: <500ps • PCI Early to PCI Skew @ 3.3V: typ = 3ns Pin Configuration VDDREF - SPREAD/REF0 GNDREF X1 X2 VDDPCI - CPU2.5_3.3#/PCICLK_F - FS3/PCICLK0 GNDPCI - SEL24_48#/PCICLK1 - SELPCIE_6#/PCICLK2 PCICLK3 PCICLK4 VDDPCI BUFFER IN GNDPCI PCICLK5 PCICLK6/PCICLK_E VDDCOR PCI_STOP# - PD# GND48 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 REF1/FS2- VDDLCPU CPUCLK_F CPUCLK0 GNDLCPU CPUCLK1 CPUCLK2 CLK_STOP# GNDSDR SDRAM_F SDRAM0 SDRAM1 VDDSDR SDRAM2 SDRAM3 GNDSDR SDRAM4 SDRAM5 VDDSDR SDRAM6 SDRAM7 VDD48 48MHz/FS0- 24_48MHz/FS1- 48-Pin SSOP and TSSOP - Internal Pull-up Resistor of 120K to VDD Functionality FS3 FS2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 FS1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 FS0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 CPU (MHz) 66.67 100.00 100.30 133.33 105.00 133.37 137.00 75.00 100.00 95.00 97.00 133.33 90.00 96.22 66.82 91.50 PCI (MHz) 33.33 33.33 33.43 33.33...