ICS9250-16

Integrated Circuit Systems, Inc. ICS9250-16 Frequency Generator & Integrated Buffers for Celeron & PII/III™ Recommended Application: 810/810E type chipset. Output Features: 3 CPU (2.5V) 66.6/133.3MHz (up to 150MHz achievable through I2C) 9 SDRAM (3.3V) @ 133.3MHz (up to 150MHz achievable through I2C) 8 PCI (3.3 V) @33.3MHz 2 IOAPIC (2.5V) @ 33.3MHz 2 Hublink clocks (3.3 V) @ 66.6MHz 2 USB (3.3V) @ 48MHz ( Non spread spectrum) 1 REF (3.3V) @ 14.318MHz Features: Supports spread spectrum modulation, down spread 0 to -0.5% and ± 0.25% center spread. I2C support for power management Efficient power management scheme through PD# Uses external 14.138MHz crystal Alternate frequency selections available through I2C control. Pin Configuration *FS2//REF0 VDD0 X1 X2 GND0 GND1 3V66-0 3V66-1 VDD1 VDD2 PCICLK0 PCICLK1 PCICLK2 GND2 PCICLK3 PCICLK4 GND2 PCICLK5 PCICLK6 PCICLK7 VDD2 VDD3 GND3 GND4 48MHz_0 48MHz_1 VDD4 FS0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 GNDL1 IOAPIC0 IOAPIC1 VDDL1 CPUCLK0 VDDL0 CPUCLK1 CPUCLK2 GNDL0 GND5 SDRAM0 SDRAM1 VDD5 SDRAM2 SDRAM3 GND5 SDRAM4 SDRAM5 VDD5 SDRAM6 SDRAM7 GND5 SDRAM_F VDD5 PD# SCLK SDATA FS1 56-Pin 300mil SSOP * This input has a 50KW pull-down to GND. Block Diagram X1 X2 XTAL OSC PLL1 Spread Spectrum /2 /3 3 REF0 Functionality VDDL CPU66/100/133 [2:0] 3V66 [1:0] SDRAM [7:0] SDRAM_F PCICLK [7:0] IOAPIC [...