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ICS9248-128

Integrated Circuit Systems
Part Number ICS9248-128
Manufacturer Integrated Circuit Systems
Description Frequency Generator & Integrated Buffers
Published Oct 7, 2005
Detailed Description Integrated Circuit Systems, Inc. ICS9248-128 Frequency Generator & Integrated Buffers Recommended Application: SIS 530...
Datasheet PDF File ICS9248-128 PDF File

ICS9248-128
ICS9248-128

Overview
Integrated Circuit Systems, Inc.
ICS9248-128 Frequency Generator & Integrated Buffers Recommended Application: SIS 530/620 style chipset Output Features: • - 3 CPU @ 2.
5V/3.
3V up to 133.
3 MHz.
• - 6 PCI @ 3.
3V (including 1 free-running) • - 13 SDRAMs @ 3.
3V up to 133.
3MHz.
• - 3 REF @ 3.
3V, 14.
318MHz • - 1 clock @ 24/14.
3 MHz selectable output for SIO • - 1 Fixed clock at 48MHz (3.
3V) • - 1 IOAPIC @ 2.
5V / 3.
3V Features: • Up to 133MHz frequency support • Support power management: CPU, PCI, SDRAM stop and Power down Mode from I2C programming.
• Spread spectrum for EMI control ( ± 0.
25% center spread & 0 to -0.
5% down spread).
• Uses external 14.
318MHz crystal • FS pins for frequency select Key Specifications: • CPU – CPU<175ps • SDRAM – SDRAM < 350ps • CPU–SDRAM < 500ps • CPU(early) – PCI : 1-4ns (typ.
2ns) • PCI – PCI <500ps Pin Configuration VDDR/X *MODE/REF0 GNDREF X1 X2 VDDPCI *FS1/PCICLK_F *FS2.
PCICLK0 GNDPCI PCICLK1 PCICLK2 PCICLK3 PCICLK4 VDDPCI SDRAM12 GNDSDR *CPU_STOP# /SDRAM11 *PCI_STOP# /SDRAM10 VDDSD/C *SDRAM_STOP# /SDRAM9 *PD# /SDRAM8 GNDFIX 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 VDDLAPIC IOAPIC REF1/SD_SEL#* GNDLAPIC REF2/CPU2.
5_3.
3#* CPUCLK1 VDDLCPU CPUCLK2 CPUCLK3 GNDCPU SDRAM0 SDRAM1 VDDSDR SDRAM2 SDRAM3 GNDSDR SDRAM4 SDRAM5 VDDSDR SDRAM6 SDRAM7 GNDSDR 48MHz/FS0* SIO/SEL24_14#MHz* 48-Pin SSOP * Internal Pull-up Resistor of 120K to 3.
3V on indicated inputs Block Diagram PLL2 /2 SEL24_14# X1 X2 XTAL OSC PLL1 Spread Spectrum MODE FS(2:0) CPU3.
3#_2.
5 SD_SEL# REF(2:0) IOAPIC STOP Functionality 48MHz SIO ICS9248-128 CPU MHZ SD_SEL FS2 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 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 SDRAM MHZ 90.
00 100.
05 63.
33 66.
66 75.
00 74.
66 82.
66 97.
00 66.
70 75.
00 83.
30 95.
00 100.
00 112.
00 124.
00 133.
30 PCI MHZ 30.
00 33.
35 31.
66 33.
33 30.
00 37.
33 31.
00 32.
33 33.
35 ...


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