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W133 - Spread Spectrum System Frequency Synthesizer

Description

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.

Synchronous Memory Reference Clock Output 0 through 1: Reference clock for Direct RDRAM clock generators running at 1/2 CPU clock frequency.

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 C.

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Datasheet preview – W133

Datasheet Details

Part number W133
Manufacturer Cypress Semiconductor
File Size 146.55 KB
Description Spread Spectrum System Frequency Synthesizer
Datasheet download datasheet W133 Datasheet
Additional preview pages of the W133 datasheet.

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Full PDF Text Transcription

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PRELIMINARY W133 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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