DESCRIPTION

The PCK2010RA is a clock generator (frequency synthesizer) chip for a Pentium II and other similar processors.

The PCK2010RA has four CPU clock outputs at 2.5 V, two CPUDIV2 clock outputs running at 1/2 CPU clock frequency (66 MHz or 50 MHz depending on the state of SEL133/100) and four 3V66 clocks running at 66MHz. There are eight PCI clock outputs running at 33 MHz. One of the PCI clock outputs is free-running. Additionally, the part has three 2.5 V IOAPIC clock outputs at 16.67 MHz and two 3.3 V reference clock outputs at 14.318 MHz. All clock outputs meet Intel’s drive strength, rise/fall time, jitter, accuracy, and skew requirements.

FEATURES

• Mixed 2.5 V and 3.3 V operation

• Four CPU clocks at 2.5 V

• Eight PCI clocks at 3.3 V, one free-running (synchronous with CPU clocks)

• Four 3.3 V fixed clocks @ 66 MHz

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

• Three 2.5 V IOAPIC clocks @ 16.67 MHz

• One 3.3 V 48 MHz USB clock

• Two 3.3 V reference clocks @ 14.318 MHz

• Reference 14.31818 MHz Xtal oscillator input

• 133 MHz or 100 MHz operation, 133.01 MHz in 133 mode

• Power management control input pins

• CPU clock jitter ≤ 250 ps cycle-cycle

• CPU clock skew ≤ 175 ps pin-pin

• 0.0 ns – 1.5 ns CPU–3V66 delay

• 1.5 ns – 3.5 ns 3V66–PCI delay

• 1.5 ns – 4.0 ns CPU–IOAPIC delay

• 1.5 ns – 4.0 ns CPU–PCI delay

• Available in 56-pin SSOP package

• ±0.6 center spread spectrum capability via select pins

• –0.6 down spread spectrum capability via select pins