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4043B

Quadruple R/S latch with 3-state outputs

Philips Electronics 

Philips Semiconductors

Quadruple R/S latch with 3-state outputs

DESCRIPTION

The HEF4043B is a quadruple R/S latch with 3-state

outputs with a common output enable input (EO). Each

latch has an active HIGH set input (S0 to S3), an active

HIGH reset input (R0 to R3) and an active HIGH 3-state

output (O0 to O3).

When EO is HIGH, the state of the latch output (On) can be

determined from the function table below. When EO is

LOW, the latch outputs are in the high impedance

OFF-state. EO does not affect the state of the latch.

The high impedance off-state feature allows common

busing of the outputs.

Product specification

HEF4043B

MSI

Fig.2 Pinning diagram.

Fig.1 Functional diagram.

HEF4043BP(N): 16-lead DIL; plastic (SOT38-1)

HEF4043BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)

HEF4043BT(D): 16-lead SO; plastic (SOT109-1)

( ): Package Designator North America

PINNING

EO

S0 to S3

R0 to R3

O0 to O3

common output enable input

set inputs (active HIGH)

reset inputs (active HIGH)

3-state buffered latch outputs

FUNCTION TABLE

INPUTS

EO

Sn

Rn

L

X

X

H

L

H

H

H

X

H

L

L

OUTPUT

On

Z

L

H

latched

Notes

1. H = HIGH state (the more positive voltage)

L = LOW state (the less positive voltage)

X = state immaterial

Z = high impedance state

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

January 1995

2

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