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HEF4050BU

8-channel analogue multiplexer/demultiplexer

Philips Electronics 

Philips Semiconductors

HEX non-inverting buffers

DESCRIPTION

The HEF4050B provides six non-inverting buffers with

high current output capability suitable for driving TTL or

high capacitive loads. Since input voltages in excess of the

buffers’ supply voltage are permitted, the buffers may also

be used to convert logic levels of up to 15 V to standard

TTL levels. Their guaranteed fan-out into common bipolar

logic elements is shown in the table below.

Product specification

HEF4050B

buffers

Fig.2 Pinning diagram.

Fig.1 Functional diagram.

Guaranteed fan-out in common logic families

DRIVEN ELEMENT

standard TTL

74 LS

74 L

GUARANTEED

FAN-OUT

2

9

16

Fig.3 Logic diagram (one gate).

HEF4050BP(N): 16-lead DIL; plastic

(SOT38-1)

HEF4050BD(F): 16-lead DIL; ceramic (cerdip)

(SOT74)

HEF4050BT(D): 16-lead SO; plastic

(SOT109-1)

( ): Package Designator North America

APPLICATION INFORMATION

Some examples of applications for the HEF4050B are:

• LOCMOS to DTL/TTL converter

• HIGH sink current for driving 2 TTL loads

• HIGH-to-LOW level logic conversion

Input protection

Fig.4 Input protection circuit that allows input

voltages in excess of VDD.

FAMILY DATA, IDD LIMITS category BUFFERS

See Family Specifications

January 1995

2

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