General Description

The ICS9159-06 is a low cost frequency generator designed specifically for Pentium systems. The integrated buffer minimizes skew and provides the early CPU clock required by some chipsets such as the OPTiVIPER.A 14.318 MHz XTAL oscillator provides the reference clock to generate standard Pentium frequencies. The CPU clock makes gradual frequency transitions without violating the PLL timing of internal microprocessor clock multipliers.

Features

• Four CPU clocks operate up to 66 MHz at 3.3V with glitch-free start and stop plus smooth transitions

• 3-6ns early CPU clock supports OPTi VIPER systems

• Selection of 8 frequencies, tristate, or power-down

• Six BUS clocks support asynchronous PCI bus operation

• –250ps skew between synchronous outputs

• Integrated buffer outputs drive up to 30pF loads

• 3.1V -5.5V supply range

• 28-pin 300-mil SOIC package

Applications

• Ideal for green Pentium and 486 PCI systems