ICS9250-28

ICS9250-28 Frequency Generator & Integrated Buffers for Celeron & PII/III™ Recommended Application: 810/810E and 815 type chipset. Output Features: 2 CPU (2.5V) (up to 133MHz achievable through I2C) 13 SDRAM (3.3V) (up to 133MHz achievable through I2C) 2 PCI (3.3 V) @33.3MHz 1 IOAPIC (2.5V) @ 33.3 MHz 3 Hublink clocks (3.3 V) @ 66.6 MHz 2 (3.3V) @ 48 MHz (Non spread spectrum) 1 REF (3.3V) @ 14.318 MHz Features: Supports spread spectrum modulation, 0 to -0.5% down spread. I2C support for power management Efficient power management scheme through PD# Uses external 14.138 MHz crystal Alternate frequency selections available through I2C control. Pin Configuration IOAPIC 1 VDDL 2 GND 3 *FS1/REF0 4 VDDREF 5 X1 6 X2 7 GND 8 VDD3V66 9 3V66_0 10 3V66_1 11 3V66_2 12 GND 13 VDDPCI 14 PCICLK0 15 PCICLK1 16 GND 17 FS0 18 GND 19 VDDA 20 PD# 21 SCLK 22 SDATA 23 GND 24 VDD48 25 48MHz_0 26 48MHz_1 27 FS2 28 ICS9250-28 56 VDDL 55 GND 54 CPUCLK0 53 CPUCLK1 52 GND 51 SDRAM0 50 SDRAM1 49 VDDSDR 48 GND 47 SDRAM2 46 SDRAM3 45 SDRAM4 44 VDDSDR 43 GND 42 SDRAM5 41 SDRAM6 40 VDDSDR 39 GND 38 SDRAM7 37 SDRAM8 36 SDRAM9 35 VDDSDR 34 GND 33 SDRAM10 32 SDRAM11 31 VDDSDR 30 GND 29 SDRAM12 56-Pin 300mil SSOP * This input has a 50KW pull-down to GND. Block Diagram X1 XTAL X2 OSC PLL1 Spread Spectrum /2 /3 FS(2:0) PD# SDATA SCLK Control Logic Config Reg PLL2 /2...