PCK2021 datasheet(11/15 Pages) PHILIPS

部件名	PCK2021

功能描述	CK00 100/133 MHz spread spectrum differential system clock generator

PDF	15 Pages

Scroll/Zoom	100%

制造商	PHILIPS [NXP Semiconductors]

网页	http://www.nxp.com

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11 / 15 page

Philips Semiconductors

Product data

PCK2021

CK00 (100/133 MHz) spread spectrum differential

system clock generator

2001 Oct 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

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

SW00662

Figure 3. State enable and disable times

PULSE

GENERATOR

DUT

VDD

TEST

tPLH/tPHL

Open

tPLZ/tPZL

2 VDD

tPHZ/tPZH

VSS

Open

VSS

VDD

VDD = VDD3

500

Ω

500

Ω

SW00963

Figure 4. Load circuitry for switching times

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