Overview

The W159 is designed to provide the essential frequency sources to work with advanced multiprocessing Intel? architecture platforms. Split voltage supply signaling provides 2.5V and 3.3V clock frequencies operating up to 133 MHz.

From a low-cost 14.31818-MHz reference crystal oscillator, the W159 generates 2.5V clock outputs to support CPUs, core logic chip set, and Direct RDRAM clock generators. It also provides skew-controlled PCI and IOAPIC clocks synchronous to CPU clock, 48-MHz Universal Serial Bus (USB) clock, and replicates the 14.31818-MHz reference clock.

特性 Features

? Maximized EMI suppression using Cypress’s spread spectrum technology (0.5 down spread)

? Seven skew-controlled copies of CPU and 16.667-MHz synchronous APIC output

? Two copies of fixed-frequency 33-MHz outputs

? Four copies of 66-MHz fixed-frequency outputs

? Two copies of CPU/2 outputs for synchronous memory reference

? 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