DESCRIPTION

The PCK2020 is a clock synthesizer/driver for a Pentium III and other similar processors.

The PCK2020 has four differential pair CPU current source outputs, two Mref clock outputs running at 1/2 the CPU clock frequency depending on the state of SEL133/100 pin and four 3V66 clocks running at 66 MHz. There are ten PCI clock outputs running at 33 MHz and two 48 MHz clocks. Finally, there are two 3.3 V reference clocks at 14.318 MHz. All clock outputs meet Intel’s drive strength, rise/fall times, jitter, accuracy, and skew requirements.

The part possesses a dedicated power-down input pin for power management control. This input is synchronized on-chip and ensures glitch-free output transitions.

FEATURES

? 3.3 V operation

? Four differential CPU clock pairs

? Ten PCI clocks at 3.3 V

? Four 66 MHz clocks at 3.3 V

? Two 48 MHz clocks at 3.3 V

? Two 14.318 MHz reference clocks

? 100 or 133 MHz operation

? Power management control pins

? CPU clock skew less than 200 ps cycle-to-cycle

? CPU clock skew less than 150 ps pin-to-pin

? 1.5 ns to 3.5 ns delay on PCI pins

? Spread Spectrum capability