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W158 - Spread Spectrum System Frequency Synthesizer

Datasheet Summary

Description

41, 42, 45, 46 O CPU Clock Outputs 0 through 3: These four CPU clocks run at a frequency set by SEL133/100#.

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

Features

  • Maximized EMI suppression using Cypress’s spread spectrum technology.
  • Intel® CK98 Specification compliant.
  • 0.5% downspread outputs deliver up to 10 dB lower EMI.
  • Four skew-controlled copies of CPU output.
  • Eight copies of PCI output (synchronous w/CPU output).
  • Four copies of 66-MHz fixed frequency 3.3V clock.
  • Two copies of CPU/2 outputs for synchronous memory reference.
  • Three copies of 16.67-MHz IOAPIC clock, synchronous to.

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Datasheet Details

Part number W158
Manufacturer Cypress Semiconductor
File Size 166.08 KB
Description Spread Spectrum System Frequency Synthesizer
Datasheet download datasheet W158 Datasheet
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Full PDF Text Transcription

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W158 Spread Spectrum System Frequency Synthesizer Features • Maximized EMI suppression using Cypress’s spread spectrum technology • Intel® CK98 Specification compliant • 0.5% downspread outputs deliver up to 10 dB lower EMI • Four skew-controlled copies of CPU output • Eight copies of PCI output (synchronous w/CPU output) • Four copies of 66-MHz fixed frequency 3.3V clock • Two copies of CPU/2 outputs for synchronous memory reference • Three copies of 16.67-MHz IOAPIC clock, synchronous to CPU clock • One copy of 48-MHz USB output • Two copies of 14.31818-MHz reference clock • Programmable to 133- or 100-MHz operation • Power management control pins for clock stop and shut down • Available in 56-pin SSOP CPU Output Jitter: ......................................................
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