Frequency Generator & Integrated Buffers
Integrated Circuit Systems, Inc.
ICS9248-138
Preliminary Product Preview
Frequency Generator & Integrated Buffers for ...
Description
Integrated Circuit Systems, Inc.
ICS9248-138
Preliminary Product Preview
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application: 810/810E and Solano type chipset. Output Features: 2- CPUs @ 2.5V 9 - SDRAM @ 3.3V, including 1 free running 7 - PCICLK @ 3.3V 1 - IOAPIC @ 2.5V, 3 - 3V66MHz @ 3.3V 2 - 48MHz, @ 3.3V fixed. 1 - 24/48MHz, @3.3V selectable by I2C 1 - REF @v3.3V, 14.318MHz. Features: Up to 200MHz frequency support Support FS0-FS4 strapping status bit for I2C read back. Support power management: Through Power down Mode from I2C programming. Spread spectrum for EMI control ( ± 0.25% center). Uses external 14.318MHz crystal Skew Specifications: CPU – CPU: <175ps SDRAM - SDRAM: < 250ps 3V66 – 3V66: <175ps PCI – PCI: <500ps For group skew specifications, please refer to group timing relationship.
Pin Configuration
1
*SEL24_48#/REF0 VDDREF X1 X2 GNDREF GND3V66 3V66-0 3V66-1 3V66-2 VDD3V66 VDDPCI 1 *FS0/PCICLK0 1 **FS1/PCICLK1 GNDPCI PCICLK2 PCICLK3 PCICLK4 VDDPCI PCICLK5 PCICLK6 GNDPCI PD# SCLK SDATA
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
VDDLAPIC 1 IOAPIC VDDLCPU CPUCLK0 CPUCLK1 GNDLCPU GNDSDR SDRAM0 SDRAM1 SDRAM2 VDDSDR SDRAM3 SDRAM4 SDRAM5 GNDSDR SDRAM6 SDRAM7 SDRAM_F VDDSDR GND48 24_48MHz/FS2** 48MHz/FS3* 1 48MHz/FS4* VDD48
48-Pin 300mil SSOP
* These inputs have a 120K pull up to VDD. * * These inputs...
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