Philips Semiconductors

Product specification

74F242/74F243

Transceivers

1990 Aug 30

3

LOGIC SYMBOLS (IEEE/IEC)

SF00769

3

4

1

EN1

13

EN2

5

6

11

10

9

8

74F242

1

2

SF00771

GND = Pin 7

74F242

11

10

A0

9

A1

8

A2

A3

B0

B1

B2

B3

1

3

4

5

6

13

SF00770

3

4

1

EN1

13

EN2

5

6

11

10

9

8

74F243

1

2

11

10

A0

9

A1

8

A2

A3

B0

B1

B2

B3

1

3

4

5

6

13

74F243

SF00772

GND = Pin 7

LOGIC DIAGRAMS

FUNCTION TABLE, 74F242

INPUTS

OUTPUTS

An

Bn

L

L

INPUT

B=A

H

L

Z

Z

L

H

a

a

H

H

A=B

INPUT

H = High voltage level

L = Low voltage level

Z = High impedance “off” state

a = This condition is not allowed due to excessive currents

FUNCTION TABLE, 74F243

INPUTS

OUTPUTS

An

Bn

L

L

INPUT

B=A

H

L

Z

Z

L

H

a

a

H

H

A=B

INPUT