5-393

FAST AND LS TTL DATA

QUAD BUS TRANSCEIVER

The SN54/ 74LS242 and SN54 / 74LS243 are Quad Bus Transmitters / Re-

ceivers designed for 4-line asynchronous 2-way data communications

between data buses.

LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)

14

13

12

11

10

9

1

2

3

4

5

6

8

7

VCC GBA NC

1B

2B

3B

4B

GBA

NC

1A

2A

3A

4A

GND

SN54 / 74LS242

SN54 / 74LS243

14

13

12

11

10

9

1

2

3

4

5

6

8

7

VCC GBA NC

1B

2B

3B

4B

GBA

NC

1A

2A

3A

4A

GND

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

TRUTH TABLES

SN54 / 74LS242

INPUTS

OUTPUT

INPUTS

OUTPUT

GAB

D

OUTPUT

GAB

D

OUTPUT

L

L

H

L

X

(Z)

L

H

L

H

L

H

H

X

(Z)

H

H

L

SN54/74LS243

INPUTS

OUTPUT

INPUTS

OUTPUT

GAB

D

OUTPUT

GAB

D

OUTPUT

L

L

L

L

X

(Z)

L

H

H

H

L

H

H

X

(Z)

H

H

L

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = HIGH Impedance

SN54/74LS242

SN54/74LS243

QUAD BUS TRANSCEIVER

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXDW SOIC

J SUFFIX

CERAMIC

CASE 632-08

N SUFFIX

PLASTIC

CASE 646-06

14

1

14

1

14

1

D SUFFIX

SOIC

CASE 751A-02