Overview

The W48S101-04, a motherboard clock synthesizer, can pro vide either a 2.5V or 3.3V CPU clock swing, making it suitable for a variety of CPU options. A fixed 48-MHz clock is provided for other system functions. The W48S101-04 supports spread spectrum clocking for reduced EMI.

Features

• Maximized EMI suppression using Cypress’s Spread Spectrum technology

• I2C™ interface

• Four copies of CPU output

• Eight copies of PCI clock (synchronous w/CPU output)

• Two copies of 14.318-MHz IOAPIC output

• One copy of 48-MHz USB output

• Selectable 24-/48-MHz clock-through-resistor strapping

• Three buffered copies of 14.318-MHz reference input

• Input is a 14.318-MHz XTAL or reference signal

• Selectable 100-MHz or 66-MHz CPU outputs

• Power management control input pins

• Test mode and output three-state through I2C interface