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PCK2021DGG

CK00 (100/133 MHz) spread spectrum differential system clock generator

Philips Electronics 

Philips Semiconductors

CK00 (100/133 MHz) spread spectrum differential

system clock generator

Product data

PCK2021

AC WAVEFORMS

VM = 1.25 V @ VDDL and 1.5 V @ VDD3

VX = VOL + 0.3 V

VY = VOH – 0.3 V

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

HOST CLK

50%

tPERIOD

50%

VOH

VSS

SW00962

Figure 1. HOST CLOCK

COMPONENT

MEASUREMENT

POINTS

VOH = 2.4 V

VOL = 0.4 V

VSS

VDDL

VIH = 2.0 V

1.5 V

VIL = 0.7 V

SYSTEM

MEASUREMENT

POINTS

Figure 2. 3.3 V clock waveforms

SW00668

VI

SEL1,

SEL0

VM

GND

VDD

OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

tPLZ

VX

tPZL

VM

VOH

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

VSS

tPHZ

outputs

enabled

tPZH

VY

outputs

disabled

VM

outputs

enabled

SW00662

Figure 3. State enable and disable times

PULSE

GENERATOR

VI

RT

VDD

DUT

VO

CL

S1

2 VDD

Open

VSS

500 Ω

500 Ω

TEST

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

S1

Open

2 VDD

VSS

VDD = VDD3

Figure 4. Load circuitry for switching times

SW00963

2001 Oct 11

11

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