Dell hef4556b Schematics

INTEGRATED CIRCUITS

DATA SH EET

For a complete data sheet, please also download:

•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC

•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC

HEF4556B
MSI

Dual 1-of-4 decoder/demultiplexer

Product specification
File under Integrated Circuits, IC04

January 1995

Philips Semiconductors Product specification

Dual 1-of-4 decoder/demultiplexer

DESCRIPTION

The HEF4556B is a dual 1-of-4 decoder/demultiplexer.
Each has two address inputs (A0and A1), an active LOW
enable input (E) and four mutually exclusive outputs which
are active LOW (O0to O3). When used as a decoder,
E when HIGH, forces O0to O3HIGH. When used as a
demultiplexer, the appropriate output is selected by the
information on A0and A1with E as data input. All
unselected outputs are HIGH.

HEF4556B

MSI

Fig.2 Pinning diagram.

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

Fig.1 Functional diagram.

PINNING

E enable inputs (active LOW)
A

and A

0

O0to O

FAMILY DATA, IDDLIMITS category MSI

See Family Specifications

1

3

address inputs
outputs (active LOW)

January 1995 2