L293D

QUADRUPLE HALF-H DRIVER

SLRS008A – SEPTEMBER 1986 – REVISED MAY 1990

Copyright

3–1

POST OFFICE BOX 655303

Driver

Transient Suppression

4.5 V to 36 V

description

The L293D is a quadruple high-current half-H

driver designed to provide bidirectional drive

currents of up to 600-mA at voltages from 4.5 V to

36 V. It is designed to drive inductive loads such as

relays, solenoids, dc and bipolar stepping motors,

as well as other high-current/high-voltage loads in

positive-supply applications.

All inputs are TTL-compatible. Each output is a

complete totem-pole drive circuit with a Darlington

transistor sink and a pseudo-Darlington source.

Drivers are enabled in pairs with drivers 1 and 2

enabled by 1, 2EN and drivers 3 and 4 enabled by

3, 4EN. When an enable input is high, the

associated drivers are enabled, and their outputs

are active and in phase with their inputs. External

high-speed output clamp diodes should be used

for inductive transient suppression. When the

enable input is low, those drivers are disabled, and

their outputs are off and in a high-impedance

state. With the proper data inputs, each pair of

drivers form a full-H (or bridge) reversible drive

suitable for solenoid or motor applications.

for the logic inputs to minimize device power

dissipation.

The L293D is designed for operation from 0

°C

to 70

°C.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1, 2EN

1A

1Y

2Y

2A

4A

4Y

3Y

3A

3, 4EN

NE PACKAGE

(TOP VIEW)

HEAT SINK AND

GROUND

HEAT SINK AND

GROUND

4A

3, 4EN

3A

2A

1, 2EN

1A

15

9

10

7

1

2

4Y

3Y

2Y

1Y

14

11

6

3

EN

EN

EN

EN

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

and IEC Publication 617-12.

logic diagram

4A

3, 4EN

3A

2A

1, 2EN

1A

15

9

10

7

1

2

4Y

3Y

2Y

1Y

14

11

6

3

INPUTS‡

OUTPUT

Y

FUNCTION TABLE

(each driver)

AEN

H

L

X

H

H

L

H

L

Z

H = high-level, L = low level,

X = irrelevant, Z = high-impedance (off)

‡ In the thermal shutdown mode, the

output is in the high-impedance state

regardless of the input levels.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.