SN54ALS240A, SN54AS240A, SN74ALS240A, SN74AS240A

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SDAS214E – DECEMBER 1982 – REVISED AUGUST 2002

3

POST OFFICE BOX 655303

logic diagram (positive logic)

1

2

4

6

8

19

11

13

15

17

3

5

7

9

12

14

16

18

1A1

1A2

1A3

1A4

1Y1

2A1

2A2

2A3

2A4

2Y1

1Y2

1Y3

1Y4

2Y2

2Y3

2Y4

1OE

2OE

7 V

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

7 V

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

Voltage applied to a disabled 3-state output

5.5 V

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

Package thermal impedance,

70

°C/W

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

DW package

58

°C/W

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

N package

70

°C/W

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

NS package

60

°C/W

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

– 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.

NOTE 1: The package thermal impedance is calculated in accordance with JESD 51-7.