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W147 - Frequency Generator

General Description

Reference Clock: 3.3V 14.318-MHz clock output.

This pin doubles as the select strap for APIC clock frequency.

If strapped LOW during power up, APIC clock runs at half PCI clock speed.

Key Features

  • Maximized EMI suppression using Cypress’s Spread Spectrum Technology.
  • Low jitter and tightly controlled clock skew.
  • Highly integrated device providing clocks required for CPU, core logic, and SDRAM.
  • Three copies of CPU clock at 66/100 MHz.
  • Nine copies of 100-MHz SDRAM clocks.
  • Eight copies of PCI clock.
  • Two copies of synchronous APIC clock.
  • Two copies of 48-MHz clock (non-spread spectrum) optimized for USB reference input an.

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Other Datasheets by Cypress (now Infineon)

Part Number Description
W147G Frequency Generator
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W149 440BX AGPset Spread Spectrum Frequency Synthesizer

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.

View original datasheet text
PRELIMINARY W147G Frequency Generator for Integrated Core Logic Features • Maximized EMI suppression using Cypress’s Spread Spectrum Technology • Low jitter and tightly controlled clock skew • Highly integrated device providing clocks required for CPU, core logic, and SDRAM • Three copies of CPU clock at 66/100 MHz • Nine copies of 100-MHz SDRAM clocks • Eight copies of PCI clock • Two copies of synchronous APIC clock • Two copies of 48-MHz clock (non-spread spectrum) optimized for USB reference input and video dot clock • Two copies of 66-MHz fixed clock • One copy of 14.31818-MHz reference clock • Power-down control • I2C interface for turning off unused clocks Key Specifications CPU, SDRAM Outputs Cycle-to-Cycle Jitter: ..............