PCK2000DL datasheet(10/14 Pages) PHILIPS

10 / 14 page

Philips Semiconductors

Product specification

PCK2000

CK97 (66/100MHz) System Clock Generator

1998 Sep 29

AC WAVEFORMS

VM = 1.25V @ VDDQ2 and 1.5V @ VDDQ3

VX = VOL + 0.3V

VY = VOH –0.3V

VOL and VOH are the typical output voltage drop that occur with the

output load.

CPUCLK

1.25V

SW00240

1.25V

CPUCLK

VDDQ2

VSS

VDDQ2

VSS

THSKW

Figure 1. CPUCLK to CPUCLK skew

CPUCLK

1.5V

1.25V

PCICLK

VDDQ2

VSS

VDDQ3

VSS

THPOFFSET

SW00241

Figure 2. CPUCLK to PCICLK offset

SW00242

THKP

DUTY CYCLE

THKH

TRISE

TFALL

THKL

TPKP

TPKH

TRISE

TFALL

TPKL

2.5V CLOCKING

INTERFACE

3.3V CLOCKING

INTERFACE

(TTL)

2.0

1.25

0.4

2.4

1.5

0.4

Figure 3. 2.5V/3.3V Clock waveforms

tPLZ

tPZL

SEL 100, 66,

SEL1, SEL0

GND

VDD

OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

VOH

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

VSS

outputs

enabled

outputs

enabled

outputs

disabled

tPHZ

tPZH

SW00239

Figure 4. 3-State enable and disable times.

VDDQ2

2.5VOLT MEASURE POINTS

VOH = 2.0V

VIH = 1.7V

1.25V

VIL = 0.7V

VOL = 0.4V

VSS

SYSTEM

MEASUREMENT

POINTS

VDDQ3

3.3VOLT MEASURE POINTS

VOH = 2.4V

VIH = 2.0V

1.5V

VIL = 0.7V

VOL = 0.4V

VSS

COMPONENT

MEASUREMENT

POINTS

SYSTEM

MEASUREMENT

POINTS

SW00243

COMPONENT

MEASUREMENT

POINTS

Figure 5. Component versus system measure points

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