鈥?/div>
1A
2
1
7
10
9
15
EN
EN
14
EN
EN
6
11
3
1Y
2Y
3Y
4Y
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.
A V
CC1
terminal, separate from V
CC2
, is provided
for the logic inputs to minimize device power
dissipation.
The L293D is designed for operation from 0擄C
to 70擄C.
1, 2EN
2A
3A
3, 4EN
4A
鈥?This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
logic diagram
1A
1, 2EN
2A
7
6
2Y
2
1
3
1Y
3A
3, 4EN
4A
10
9
15
11
3Y
14
4Y
FUNCTION TABLE
(each driver)
INPUTS鈥?/div>
A
H
L
X
EN
H
H
L
OUTPUT
Y
H
L
Z
H = high-level, L = low level,
X = irrelevant, Z = high-impedance (off)
鈥?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.
Copyright
漏
1990, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
3鈥?
1
2
3
4
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