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W149 - 440BX AGPset Spread Spectrum Frequency Synthesizer

Datasheet Summary

Description

CPU Clock Outputs: See Tables 2 and 6 for detailed frequency information.

Output voltage swing is controlled by voltage applied to VDDQ2.

PCI Clock Outputs 1 through 5: These five PCI clock outputs are controlled by the PCI_STOP# control pin.

Features

  • Maximized EMI suppression using Cypress’s Spread Spectrum Technology.
  • Single chip system frequency synthesizer for Intel® 440BX AGPset.
  • Two copies of CPU output.
  • Six copies of PCI output.
  • One 48-MHz output for USB.
  • One 24-MHz output for SIO.
  • Two buffered reference outputs.
  • One IOAPIC output.
  • Thirteen SDRAM outputs provide support for 3 DIMMs.
  • Spread Spectrum feature always enabled.
  • I2C™ interface.

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Datasheet Details

Part number W149
Manufacturer Cypress Semiconductor
File Size 157.98 KB
Description 440BX AGPset Spread Spectrum Frequency Synthesizer
Datasheet download datasheet W149 Datasheet
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Full PDF Text Transcription

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W149 440BX AGPset Spread Spectrum Frequency Synthesizer Features • Maximized EMI suppression using Cypress’s Spread Spectrum Technology • Single chip system frequency synthesizer for Intel® 440BX AGPset • Two copies of CPU output • Six copies of PCI output • One 48-MHz output for USB • One 24-MHz output for SIO • Two buffered reference outputs • One IOAPIC output • Thirteen SDRAM outputs provide support for 3 DIMMs • Spread Spectrum feature always enabled • I2C™ interface for programming • Power management control inputs • Smooth CPU frequency switching from 66.8–124 MHz VDDQ3: ..................................................................... 3.3V±5% VDDQ2: ..................................................................... 2.5V±5% SDRAMIN to SDRAM0:12 Delay:........................
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