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ICS950104 - Programmable System Clock Chip for PIII Processor

General Description

PIN NUMBER 1 PIN NAME CPUCLKC0 TYPE OUT DESCRIPTION "Complementary" clocks of differential pair CPU outputs.

These clocks are 180° out of phase with SDRAM clocks.

These open drain outputs need an external 1.5V pull-up.

Key Features

  • 1 - CPU clocks @ 2.5V.
  • 1 - Pair of differential CPU clocks @ 3.3V.
  • 9 - SDRAM @ 3.3V.
  • 7 - PCI @3.3V.
  • 1 - 48MHz, @3.3V.
  • 1 - 24/48MHz @ 3.3V.
  • 3 - REF @3.3V, (selectable strength) through I2C Features:.
  • Programmable ouput frequency.
  • Programmable ouput rise/fall time.
  • Programmable CPU, SDRAM, and PCI skew.
  • Real time system reset output.
  • Spread spectrum for EMI control typically by 7dB to 8dB,.

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Datasheet Details

Part number ICS950104
Manufacturer Integrated Circuit Systems
File Size 222.98 KB
Description Programmable System Clock Chip for PIII Processor
Datasheet download datasheet ICS950104 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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Integrated Circuit Systems, Inc. ICS950104 Advance Information Programmable System Clock Chip for PIII™ Processor Recommended Application: SIS630ST style chipset Output Features: • 1 - CPU clocks @ 2.5V • 1 - Pair of differential CPU clocks @ 3.3V • 9 - SDRAM @ 3.3V • 7 - PCI @3.3V • 1 - 48MHz, @3.3V • 1 - 24/48MHz @ 3.3V • 3 - REF @3.3V, (selectable strength) through I2C Features: • Programmable ouput frequency • Programmable ouput rise/fall time • Programmable CPU, SDRAM, and PCI skew • Real time system reset output • Spread spectrum for EMI control typically by 7dB to 8dB, with programmable spread percentage • Watchdog timer technology to reset system if over-clocking causes malfunction • Uses external 14.