DESCRIPTION

The PCK2010 is a clock synthesizer/driver chip for a PentiumII and other similar processors.

The PCK2010 has four CPU clock outputs at 2.5V, two CPUDIV2 clock outputs running at 1/2 CPU clock frequency (66MHz or 50MHz depending on the state of SEL133/100) and four 3V66 clocks running at 66MHz. There are eight PCI clock outputs running at 33MHz. One of the PCI clock outputs is free-running. Additionally, the part has three 2.5V IOAPIC clock outputs at 16.67MHz and two 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 PCI clocks at 3.3V, one free-running (synchronous with CPU clocks)

• Four 3.3V fixed clocks @ 66MHz

• Two 2.5V CPUDIV2 clocks @ 1/2 CPU clock frequency

• Three 2.5V IOAPIC clocks @ 16.67 MHz

• One 3.3V 48MHz USB clock

• Two 3.3V reference clocks @ 14.318 MHz

• Reference 14.31818 MHz Xtal oscillator input

• 133 MHz or 100 MHz operation

• Power management control input pins

• LOW CPU clock jitter ≤ 250 ps cycle-cycle

• LOW skew outputs

• 0.0ns – 1.5ns CPU - 3V66 delay

• 1.5ns – 4.0ns 3V66 - PCI delay

• 1.5ns – 4.0 ns CPU - IOAPIC delay

• Available in 56-pin SSOP package

• ±0.5 center spread spectrum capability via select pins; –0.5 down spread spectrum capability via select pins