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CY28158 - Spread Spectrum Timing Solution for Serverworks Chipset

Description

Reference crystal input Reference crystal feedback CPU clock outputs PCI clock outputs, synchronously running at 33.33 MHz Free running PCI clock 3V66 clock outputs, running at 66.66 MHz IOAPIC clock outputs, running at 16.67 MHz Reference clock outputs, 14.318 MHz 48-MHz USB clock output Active LOW

Features

  • Maximized EMI suppression using Cypress’s spread spectrum technology.
  • Based on Industry Standard CK133 Pinout with all outputs compliant to CK98 specifications.
  • 0.5% downspread outputs deliver up to 10dB lower EMI.
  • 6 skew-controlled copies of CPU output.
  • 6 copies of PCI output (synchronous w/CPU output).
  • 2 copies of 66 MHz fixed frequency 3.3V clock.
  • 3 copies of 16.67 MHz IOAPIC clock, synchronous to CPU clock.
  • 1 copy of 48.

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Full PDF Text Transcription

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CY28158 Spread Spectrum Timing Solution for Serverworks Chipset Features • Maximized EMI suppression using Cypress’s spread spectrum technology • Based on Industry Standard CK133 Pinout with all outputs compliant to CK98 specifications • 0.5% downspread outputs deliver up to 10dB lower EMI • 6 skew-controlled copies of CPU output • 6 copies of PCI output (synchronous w/CPU output) • 2 copies of 66 MHz fixed frequency 3.3V clock • 3 copies of 16.67 MHz IOAPIC clock, synchronous to CPU clock • 1 copy of 48 MHz USB output • 2 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 Key Specifications Supply Voltages:...................................... VDD33 = 3.3V ± 5% .......
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