74LVC543A datasheet(7/12 Pages) PHILIPS

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Philips Semiconductors

Product specification

74LVC543A

Octal D-type registered transceiver (3-State)

1998 Jul 31

AC WAVEFORMS

VM = 1.5V at VCC w 2.7V; VM = 0.5 VCC at VCC t 2.7V.

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

VX = VOL + 0.3V at VCC w 2.7V; VX = VOL + 0.1 VCC at VCC t 2.7V

VY = VOH –0.3V at VCC w 2.7V; VY = VOH – 0.1 VCC at VCC t 2.7V

SY00041

INPUT

tPHL

tPLH

VOL

GND

VOH

OUTPUT

Waveform 1.

Input (An, Bn) to output (Bn, An) propagation

delays.

tPHL

tPLH

LEXX INPUT

An, Bn

OUTPUT

GND

VOH

VOL

SA00408

Waveform 2.

Latch enable input (LEXX) pulse width and the

latch enable input to output (An, Bn) propagation delays.

tPLZ

tPZL

OEXX, EXX

INPUT

GND

VCC

OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

VOH

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

outputs

enabled

outputs

enabled

outputs

disabled

tPHZ

tPZH

SW00210

Waveform 3.

3-State enable and disable times

An, Bn

INPUT

LEXX, EXX

INPUT

tSU

NOTE: The shaded areas indicate when the input is permitted to change

for predictable output performance.

tSU

GND

SW00211

Waveform 4.

Data setup and hold times for the (An, Bn) input

to the LEXX and EXX inputs.

TEST CIRCUIT

PULSE

GENERATOR

VIN

D.U.T.

VOUT

VCC

RL=500 Ω

SWITCH POSITION

TEST

SWITCH

tPLH/tPHL

Open

tPLZ/tPZL

<VCC

tPHZ/tPZH

GND

Test Circuit for 3-State Outputs

Open

GND

<VCC

DEFINITIONS

VCC

t 2.7V

2.7 – 3.6V

VIN

VCC

2.7V

RL = Load resistor

CL = Load capacitance includes jig and probe capacitance

RT = Termination resistance should be equal to ZOUT

of pulse generators.

SW00047

RL=500 Ω

Waveform 5.

Load circuitry for switching times.

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