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74LVC573APWDH

Octal D-type transparent latch with 5-volt tolerant inputs/outputs (3-State)

Philips Electronics 

Philips Semiconductors

Octal D-type transparent latch with 5-volt

tolerant inputs/outputs (3-State)

Product specification

74LVC573A

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

VI

INPUT

VM

GND

VOH

tPHL

tPLH

OUTPUT

VM

VOL

SY00041

Waveform 1. Input (Dn) to output (Qn) propagation delays.

VI

LE INPUT

GND

VOH

Qn OUTPUT

VOL

VM

tw

tPHL

VM

tPLH

SA00388

Waveform 2. Latch enable input (LE) pulse width, the latch

enable input to output (Qn) propagation delays

VI

nOE INPUT

VM

GND

VCC

Qn OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

VOH

Qn OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

tPLZ

tPZL

VX

tPHZ

VY

tPZH

outputs

enabled

outputs

disabled

Waveform 3. 3-State enable and disable times.

VM

VM

outputs

enabled

SW00207

VI

ÉÉÉ Dn

INPUT

VM

ÉÉÉÉÉÉ GND

ÉÉÉtÉÉÉh ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉth ÉÉÉÉÉÉ

tSU

tSU

VI

LE

INPUT

VM

GND

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

for predictable output performance.

SW00073

Waveform 4. Data setup and hold times for the Dn input to the

LE input.

TEST CIRCUIT

VCC

PULSE

GENERATOR

VIN

RT

D.U.T.

VOUT

CL

S1

2<VCC

Open

GND

RL=500 Ω

RL=500 Ω

Test Circuit for 3-State Outputs

SWITCH POSITION

TEST

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

SWITCH

Open

2<VCC

GND

VCC

t 2.7V

2.7 – 3.6V

VIN

VCC

2.7V

DEFINITIONS

RL = Load resistor

CL = Load capacitance includes jig and probe capacitance

RT = Termination resistance should be equal to ZOUT

of pulse generators.

SW00047

Waveform 5. Load circuitry for switching times.

1998 Jul 29

7

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