PCK2021DL datasheet(11/15 Pages) PHILIPS

Part #	PCK2021DL

Description	CK00 100/133 MHz spread spectrum differential system clock generator

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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Philips Semiconductors

Product data

PCK2021

CK00 (100/133 MHz) spread spectrum differential

system clock generator

2001 Oct 11

11

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.

50%

HOST CLK

VOH

VSS

SW00962

50%

tPERIOD

Figure 1. HOST CLOCK

VDDL

VOH = 2.4 V

VIH = 2.0 V

1.5 V

VIL = 0.7 V

VOL = 0.4 V

VSS

SYSTEM

MEASUREMENT

POINTS

COMPONENT

MEASUREMENT

POINTS

SW00668

Figure 2. 3.3 V clock waveforms

tPLZ

tPZL

VI

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

VM

tPZH

VX

VY

SW00662

Figure 3. State enable and disable times

PULSE

GENERATOR

RT

VI

DUT

VO

CL

VDD

TEST

S1

tPLH/tPHL

Open

tPLZ/tPZL

2 VDD

tPHZ/tPZH

VSS

Open

VSS

S1

2

VDD

VDD = VDD3

500

Ω

500

Ω

SW00963

Figure 4. Load circuitry for switching times

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PCK2021DL Datasheet(PDF) 11 Page - NXP Semiconductors

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