5-235

FAST AND LS TTL DATA

DUAL 1-OF-4 DECODER/

DEMULTIPLEXER

The LSTTL/MSI SN54/74LS139 is a high speed Dual 1-of-4 Decoder /De-

multiplexer. The device has two independent decoders, each accepting two

inputs and providing four mutually exclusive active LOW Outputs. Each

decoder has an active LOW Enable input which can be used as a data input

for a 4-output demultiplexer. Each half of the LS139 can be used as a function

generator providing all four minterms of two variables. The LS139 is

fabricated with the Schottky barrier diode process for high speed and is

completely compatible with all Motorola TTL families.

CONNECTION DIAGRAM DIP (TOP VIEW)

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

Ea

Eb AOb A1b O0b

O2b

O1b

O3b

A0a A1a O0a O1a O2a O3a GND

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

PIN NAMES

LOADING (Note a)

HIGH

LOW

A0, A1

E

O0 – O3

Address Inputs

Enable (Active LOW) Input

Active LOW Outputs (Note b)

0.5 U.L.

0.5 U.L.

10 U.L.

0.25 U.L.

0.25 U.L.

5 (2.5) U.L.

NOTES:

a) 1 TTL Unit Load (U.L.) = 40

µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)

Temperature Ranges.

SN54/74LS139

DUAL 1-OF-4 DECODER/

DEMULTIPLEXER

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

16

1

D SUFFIX

SOIC

CASE 751B-03

LOGIC SYMBOL

VCC = PIN 16

GND = PIN 8

O1

1

2 3

15

14 13

4 5 6 7

12 11 10 9

E

A0 A1

DECODER a

DECODER b

O0 O1 O2 O3

O0

O2 O3

E

A0 A1

LOGIC DIAGRAM

VCC = PIN 16

GND = PIN 8

= PIN NUMBERS

A0a A1a

Ea

A0b

O3a

O0b

O1b

O2b O3b

O1a

O2a

Eb

A1b

O0a

1

2

7

3

5

4

6

9

10

14

11

12

13

15