The ICS9159-05 is a low cost frequency generator designed specifically for Pentium/Pentium Pro systems. The integrated buffer minimizes skew and provides the early CPU clock required by some chipsets such as the OPTi VIPER. 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 micro-processor clock multipliers.