W147 - Frequency Generator

Datasheet Summary

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.

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.

Cypress Semiconductor

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Datasheet Details

Part number	W147
Manufacturer	Cypress Semiconductor
File Size	140.74 KB
Description	Frequency Generator
Datasheet	W147 Datasheet
Additional preview pages of the W147 datasheet.

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Full PDF Text Transcription

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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: ..............

Published: Apr 17, 2005 |