PCK2000DL datasheet(2/14 Pages) PHILIPS

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Philips Semiconductors

Product specification

PCK2000

CK97 (66/100MHz) System Clock Generator

1998 Sep 29

853-2129 20102

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

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.

The part possesses dedicated powerdown, CPUSTOP, and

PCISTOP input pins for power management control. These inputs

are synchronized on-chip and ensure glitch-free output transitions.

When the CPUSTOP input is asserted, the CPU clock outputs are

driven LOW. When the PCISTOP input is asserted, the PCI clock

outputs are driven LOW, except for free running PCICLK_F clock

output..

Finally, when the PWRDWN input pin is asserted, the internal

reference oscillator and PLLs are shut down, and all outputs are

driven LOW.

The PCK2000 is available in a 48–pin SSOP package.

PIN CONFIGURATION

REF0

REF1

VSSREF

XTAL_IN

XTAL_OUT

VSSPCI0

PCICLK_F

VDDPCI0

PCICLK1

PCICLK2

PCICLK3

VSSPCI1

PCICLK4

PCICLK5

VDDPCI1

PCICLK6

PCICLK7

VSSPCI2

VDDCORE0

VSSCORE0

VDD48MHz

48MHz0

48MHz1

VSS48MHz

VDDREF

REF2

VDDAPIC

IOAPIC0

IOAPIC1

VSSAPIC

RESERVED

VDDCPU0

CPUCLK0

CPUCLK1

VSSCPU0

VDDCPU1

CPUCLK2

CPUCLK3

VSSCPU1

VDDCORE1

VSSCORE1

PCISTOP

CPUSTOP

PWRDWN

RESERVED

SEL0

SEL1

SEL100/66

SW00237

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

OUTSIDE NORTH AMERICA

NORTH AMERICA

DRAWING NUMBER

48-Pin Plastic SSOP

°C to +70°C

PCK2000 DL

SOT370-1

Intel and Pentium are registered trademarks of Intel Corporation.

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