January 1995

2

Philips Semiconductors

Product specification

8-input multiplexer with 3-state output

HEF4512B

MSI

DESCRIPTION

The HEF4512B is an 8-input multiplexer with 8 binary

input (EO). One of eight binary inputs is selected by select

on EO causes O to assume a high impedance OFF-state,

regardless of other input conditions. This allows the output

to interface directly with bus oriented systems (3-state).

When the active LOW enable (E) is HIGH, it forces the

output LOW provided EO is LOW. By proper manipulation

of the inputs, the device can provide any logic functions of

four variables. It cannot be used to multiplex analogue

signals.

Fig.1 Functional diagram.

HEF4512BP(N):

16-lead DIL; plastic

(SOT38-1)

HEF4512BD(F):

16-lead DIL; ceramic (cerdip)

(SOT74)

HEF4512BT(D):

16-lead SO; plastic

(SOT109-1)

( ): Package Designator North America

Fig.2 Pinning diagram.

PINNING

See Family Specifications

select inputs

EO

output enable (active LOW)

E

enable (active LOW)

multiplexer inputs

O

multiplexer output