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ICS9248-126

Integrated Circuit Systems
Part Number ICS9248-126
Manufacturer Integrated Circuit Systems
Description Frequency Generator & Integrated Buffers
Published Oct 7, 2005
Detailed Description Integrated Circuit Systems, Inc. ICS9248-126 Frequency Generator & Integrated Buffers for Celeron & PII/III™ & K6 Reco...
Datasheet PDF File ICS9248-126 PDF File

ICS9248-126
ICS9248-126

Overview
Integrated Circuit Systems, Inc.
ICS9248-126 Frequency Generator & Integrated Buffers for Celeron & PII/III™ & K6 Recommended Application: Motherboard Single chip clock solution for Pentium II/III and K6 processors, using SIS540/SIS630 style chipset.
Output Features: • 3- CPUs @ 2.
5/3.
3V, up to 166MHz.
• 14 - SDRAM @ 3.
3V • 7- PCI @3.
3V, • 1- 48MHz, @3.
3V fixed.
• 1- 24/48MHz, @3.
3V selectable by I2C (Default is 24MHz).
• 2- REF @3.
3V, 14.
318MHz.
Features: • Up to 166MHz frequency support • Support FS0-FS3 trapping status bit for I2C read back.
• Support power management: CPU, PCI, SDRAM stop and Power down Mode form I2C programming.
• Spread spectrum for EMI control (0 to -0.
5%, ± 0.
25%).
• FS0, FS1, FS3 must have a internal 120K pull-Down to GND.
• Uses external 14.
318MHz crystal Skew Specifications: • CPU - CPU: < 175ps • SDRAM - SDRAM < 500ps • PCI - PCI: < 500ps • CPU - SDRAM: < 500ps • CPU - PCI: 1 - 4ns Pin Configuration VDDREF 1 * REF0/FS3 GND X1 X2 VDDPCI *PCICLK0/FS1 *PCICLK1/FS2 PCICLK2 GND PCICLK3 PCICLK4 PCICLK5 PCICLK6 VDDSDR GND SDRAM0 SDRAM1 VDDSDR SDRAM2 SDRAM3 GND 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 VDDLCPU CPUCLK0 CPUCLK1 GND CPUCLK2 VDDSDR SDRAM13 SDRAM12 GND SDRAM11 SDRAM10 VDDSDR SDRAM9 SDRAM8 GNDSDR SDRAM7 SDRAM6 VDDSDR SDRAM5 SDRAM4 VDDSDR 1 48MHz/FS0* 24_48MHz/CPU2.
5_3.
3#* 48-Pin 300mil SSOP * These inputs have a 120K pull down to GND.
1 These are double strength.
Block Diagram PLL2 /2 X1 X2 XTAL OSC 48MHz 24_48MHz Functionality FS3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 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 CPU (MHz) 66.
6 100.
0 150.
0 133.
3 66.
8 100.
0 100.
0 133.
3 66.
8 97.
0 70.
0 95.
0 95.
0 112.
0 97.
0 96.
2 SDRAM (MHz) 100.
0 100.
0 100.
0 100.
0 133.
6 133.
3 150.
0 133.
3 66.
8 97.
0 105.
0 95.
0 126.
7 112.
0 129.
3 96.
2 PCICLK (MHz) 33.
3 33.
3 37.
5 33.
3 33.
4 33.
3 37.
5 33.
3 33.
...


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