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ICS9250-26

Part Number	ICS9250-26
Manufacturer	Integrated Circuit Systems
Description	Frequency Generator & Integrated Buffers
Published	Dec 11, 2005
Detailed Description	Integrated Circuit Systems, Inc. ICS9250-26 Frequency Generator & Integrated Buffers for Celeron & PII/III™ Recommende...
Datasheet	ICS9250-26 PDF File

Overview

Integrated Circuit Systems, Inc.
ICS9250-26 Frequency Generator & Integrated Buffers for Celeron & PII/III™ Recommended Application: 810/810E type chipset.
Provides three CPU speeds (66.
6, 100, 133MHz) with SDRAM = 133.
3MHz.
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.
3 MHz • 2 Hublink clocks (3.
3 V) @ 66.
6 MHz • 2 USB (3.
3V) @ 48 MHz ( Non spread spectrum) • 1 REF (3.
3V) @ 14.
318 MHz 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.
138 MHz 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 120KΩ pull-down to GND.
Block Diagram Functionality FS2 X X 0 0 1 1 FS1 0 0 1 1 1 1 FS0 0 1 0 1 1 0 Function Tristate Test Active CPU = 66MHz SDRAM = 100MHz Active CPU = 100MHz SDRAM = 100MHz Active CPU = 133MHz SDRAM = 100MHz (Special Condition) Active CPU = 133MHz SDRAM = 133MHz 9250-26 Rev B 01/19/01 Third party brands and names are the property of their respective owners.
ICS reserves the right to make changes in the device data identified in this publication without further notice.
ICS advises its customers to obtain the latest version of all device data to verify that any information bein...

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