Philips Semiconductors

Product specification

74F641/74F642*

Transceivers

1999 Jan 08

4

* Discontinued part. Please see the Discontinued Products List.

LOGIC DIAGRAM – 74F641

VCC =

Pin 20

GND =

Pin 10

SF01149

T/R

2

3

4

18

17

16

15

14

13

12

B0

B1

B4

B5

B6

B7

OE

A1

A4

A5

A6

A7

B2

B3

A3

A2

5

6

7

8

A0

11

9

19

1

LOGIC DIAGRAM – 74F642

VCC =

Pin 20

GND =

Pin 10

SF01150

T/R

2

3

4

18

17

16

15

14

13

12

B0

B1

B4

B5

B6

B7

OE

A1

A4

A5

A6

A7

B2

B3

A3

A2

5

6

7

8

A0

11

9

19

1

FUNCTION TABLE – 74F641

INPUTS

INPUTS/OUTPUTS

OE

T/R

An

Bn

L

L

A=B

INPUTS

H

H

INPUTS

B=A

H

X

OFF

OFF

H = High voltage level

L

= Low voltage level

X = Don’t care

OFF= High if pull-up resistor is connected to open collector output

FUNCTION TABLE – 74F642

INPUTS

INPUTS/OUTPUTS

OE

T/R

An

Bn

L

L

A=B

INPUTS

H

H

INPUTS

B=A

H

X

OFF

OFF

H = High voltage level

L

= Low voltage level

X = Don’t care

OFF= High if pull-up resistor is connected to open collector output