January 1995

2

Philips Semiconductors

Product specification

Dual 1-of-4 decoder/demultiplexer

HEF4556B

MSI

DESCRIPTION

The HEF4556B is a dual 1-of-4 decoder/demultiplexer.

enable input (E) and four mutually exclusive outputs which

demultiplexer, the appropriate output is selected by the

unselected outputs are HIGH.

Fig.1 Functional diagram.

PINNING

See Family Specifications

HEF4556BP(N):

16-lead DIL; plastic

(SOT38-1)

HEF4556BD(F):

16-lead DIL; ceramic (cerdip)

(SOT74)

HEF4556BT(D):

16-lead SO; plastic

(SOT109-1)

( ): Package Designator North America

E

enable inputs (active LOW)

address inputs

outputs (active LOW)

Fig.2 Pinning diagram.