SN74ALS641A, SN74ALS642A, SN74AS641

OCTAL BUS TRANSCEIVERS

WITH OPEN-COLLECTOR OUTPUTS

SDAS300 – MARCH 1995

2

POST OFFICE BOX 655303

logic diagrams (positive logic)

SN74ALS641A, SN74AS641

A1

B1

19

1

18

2

OE

DIR

To Seven Other Transceivers

SN74ALS642A

A1

B1

19

1

18

2

OE

DIR

To Seven Other Transceivers

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0

°C to 70°C

. . . . . . . . . . . . . . . . .

Storage temperature range

– 65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

recommended operating conditions

SN74ALS641A

SN74ALS642A

UNIT

MIN

NOM

MAX

VCC

Supply voltage

4.5

5

5.5

V

VIH

High-level input voltage

2

V

VIL

Low-level input voltage

0.8

V

VOH

High-level output voltage

5.5

V

IOL

Low level output current

24

mA

IOL

Low-level output current

48‡

mA

TA

Operating free-air temperature

0

70

°C

‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V