SN55121, SN75121

DUAL LINE DRIVERS

SLLS074C – SEPTEMBER 1973 – REVISED MAY 1998

2

POST OFFICE BOX 655303

FUNCTION TABLE

INPUTS

OUTPUT

A

B

C

D

E

F

Y

H

H

H

H

X

X

H

X

XXX

H

H

H

All other input combinations

L

H = high level, L = low level, X = irrelevant

&1

2Y

1Y

9

7

&

2F

2E

2D

2C

2B

2A

1F

1E

1D

1C

1B

1A

15

14

13

12

11

10

6

5

4

3

2

1

≥

† This symbol is in accordance with ANSI/IEEE Std 91-1984 and

IEC Publication 617-12.

Pin numbers shown are for the D, J, and N packages.

logic diagram (positive logic)

1

2

3

4

7

1Y

10

11

12

13

9

2Y

1A

1B

1C

1D

2A

2B

2C

2D

5

6

1E

1F

14

15

2E

2F

schematic (each driver)

VCC

To Other

Line Driver

4 k

Ω

4 k

Ω

A

B

C

D

E

F

GND

To Other

Line Driver

360

Ω

15

Ω

Y

All resistor values shown are nominal.