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W164 - Spread Spectrum Desktop/Notebook System Frequency Generator

General Description

CPU Clock Outputs 0 through 1: These two CPU clocks run at a frequency set by SEL100/66#.

Output voltage swing is set by the voltage applied to VDDQ2.

PCI Clock Outputs 1 through 6 and PCI_F: These seven PCI clock outputs run synchronously to the CPU clock.

Key Features

  • Maximized EMI suppression using Cypress’s Spread Spectrum technology.
  • Reduces measured EMI by as much as 10 dB.
  • I2C programmable to 153 MHz (16 selectable frequencies).
  • Two skew-controlled copies of CPU output.
  • SEL100/66# selects CPU frequency (100 or 66.8 MHz).
  • Seven copies of PCI output (synchronous w/CPU output).
  • One copy of 14.31818-MHz IOAPIC output.
  • One copy of 48-MHz USB output.
  • Selectable 24-/48-MHz output.

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Other Datasheets by Cypress (now Infineon)

Part Number Description
W161 133-MHz Spread Spectrum FTG
W162 Spread Aware/ Zero Delay Buffer
W163 Spread Aware/ Zero Delay Buffer
W166 Spread Spectrum Frequency Timing Generator
W167B 133-MHz Spread Spectrum FTG

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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W164 Spread Spectrum Desktop/Notebook System Frequency Generator Features • Maximized EMI suppression using Cypress’s Spread Spectrum technology • Reduces measured EMI by as much as 10 dB • I2C programmable to 153 MHz (16 selectable frequencies) • Two skew-controlled copies of CPU output • SEL100/66# selects CPU frequency (100 or 66.8 MHz) • Seven copies of PCI output (synchronous w/CPU output) • One copy of 14.31818-MHz IOAPIC output • One copy of 48-MHz USB output • Selectable 24-/48-MHz output is determined by resistor straps on power-up • One high-drive output buffer that produces a copy of the 14.318-MHz reference • Isolated core VDD pin for noise reduction Key Specifications Supply Voltages:....................................... VDDQ3 = 3.3V±5% VDDQ2 = 2.