DESCRIPTION

The PCK2000 is a clock synthesizer/driver chip for a Pentium Pro or other similar processors.

The PCK2000 has four CPU clock outputs at 2.5V. There are eight PCI clock outputs running at 33MHz. One of the PCI clock outputs is free-running. Additionally, the part has two 3.3V USB clock outputs at 48MHz, two 2.5V IOAPIC clock outputs at 14.318MHz, and three 3.3V reference clock outputs at 14.318MHz. All clock outputs meet Intel’s drive strength, rise/fall time, jitter, accuracy, and skew requirements.

FEATURES

• Mixed 2.5V and 3.3V operation

• Four CPU clocks at 2.5V

• Eight synchronous PCI clocks at 3.3V, one free-running

• Two 2.5V IOAPIC clocks @ 14.318 MHz

• Two 3.3V 48MHz USB clock outputs

• Three 3.3V reference clocks @ 14.318 MHz

• Reference 14.31818 MHz Xtal oscillator input

• 100 MHz or 66 MHz operation

• Part provides frequencies for Pentium Pro and Pentium II™ motherboards

• Power management control input pins

• 175 ps CPU clock jitter

• 175 ps skew on outputs

• 1.5 – 4 ns CPU–PCI delay

• Power down if PWRDWN is held LOW

• Available in 48-pin SSOP package

• See PCK2000M for 28-pin mobile version