L293B

L 293B
L293E
PUSH-PULL FOUR CHANNEL DRIVERS

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OUTPUT CURRENT 1A PER CHANNEL
PEAK OUTPUT CURRENT 2A PER CHANNEL
(non repetitive)
INHIBIT FACILITY
HIGH NOISE IMMUNITY
SEPARATE LOGIC SUPPLY
OVERTEMPERATURE PROTECTION

DIP16
ORDERING NUMBER : L293B

DESCRIPTION
The L293B and L293E are quad push-pull drivers
capable of delivering output currents to 1A per channel.Each channel is controlled by a TTL-compatible
logic input and each pair of drivers (a full bridge) is
equipped with an inhibit input which turns off all four
transistors. A separate supply input is provided for
the logic so that it may be run off a lower voltage to
reduce dissipation.
Additionally, the L293E has external connection of
sensing resistors, for switchmode control.
The L293Band L293E are package in 16 and 20-pin
plastic DIPs respectively ; both use the four center
pins to conduct heat to the printed circuit board.

POWERDIP (16 + 2+ 2)
ORDERING NUMBER : L293E

PIN CONNECTIONS
DIP16 - L293B

April 1993

POWERDIP (16+2+2) - L293E

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L293B - L293E
BLOCK DIAGRAMS
DIP16 - L293B

POWERDIP (16+2+2) - L293E

2/12

L293B - L293E
SCHEMATIC DIAGRAM(*) In the L293 these points are not externally available. They are internally connected to the ground (substrate).
O Pins of L293
() Pins of L293E.

3/12

L293B - L293E
ABSOLUTE MAXIMUM RATINGS
Symbol
Vs
Vss
Vi
Vinh
Iout
Ptot
Tstg, Tj

Parameter
Supply Voltage
Logic Supply Voltage
Input Voltage
Inhibit Voltage
Peak Output Current (non repetitive t = 5ms)
Total PowerDissipation at Tground-pins = 80oC
Storage and Junction Temperature

Value
36
36
7
7
2
5
–40 to +150

Unit
V
V
V
V
A
W
o
C

THERMAL DATA
Symbol
Rth j-case
Rth j-amb

Parameter
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient

Value
14
80

Max.
Max.

Unit
C/W
o
C/W
o

ELECTRICAL CHARACTERISTICS
For each channel, VS = 24V, VSS = 5V, Tamb= 25oC, unless otherwise specified
Symbol
Vs
Vss
Is

Parameter
Supply Voltage
Logic Supply Voltage
Total Quiescent Supply Current

Test Conditions

Vi = L
Vi = H

Iss

Total Quiescent Logic Supply Current

ViL
ViH

Input Low Voltage
Input High Voltage
Low Voltage Input Current
High Voltage Input Current
Inhibit Low Voltage
Inhibit High Voltage

IinhL
IinhH

LowVoltage Inhibit Current
High Voltage Inhibit Current
Source Output Saturation Voltage
Sink Output Saturation Voltage
Sensing Voltage (pins 4, 7, 14, 17) (**)
Rise Time
Fall Time
Turn-on Delay
Turn-off Delay

*
**

See figure 1
Referred to L293E

TRUTH TABLE
Vi (each channel)
H
L
H
L

Vo
H
L
X (o)
X (o)

(*) High output impedance
(**) Relative to the considerate channel4/12

Vi = L
Vi = H

Io = 0
Io = 0

Vinh
Vinh
Vinh
Vinh
Vinh
Vinh

=
=
=
=
=
=

VSS ≤ 7V
Vss > 7V
Vil = 1.5V
2.3V ≤ VIH ≤ Vss - 0.6V

IiL
IiH
VinhL
VinhH

VCEsatH
VCEsatL
VSENS
tr
tf
ton
toff

Io = 0
Io = 0

Min.
Vss
4.5

Vinh (∞)
H
H
L
L

VSS ≤ 7V
Vss > 7V
VinhL = 1.5V
2.3V ≤ VinhH ≤ Vss - 0.6V
Io = -1A
Io = 1A
0.1
0.9
0.5
0.5

toto
Vi
Vi

0.9 Vo (*)
0.1 Vo (*)
to 0.5 Vo (*)
to 0.5 Vo (*)

H
H
L
H
H
L

TYp.

2
16
44
16
16
-03.
2.3
2.3
30
-0.3
2.3
2.3
-30
1.4
1.2
250
250
750
200

Max.
36
36
6
24
4
60
22
24
1.5
Vss
7
-10
100
1.5
Vss
7
-100
±10
1.8
1.8
2

Unit
V
V
mA

mA

V
V
µA
µA
V
V
µA
µA
V
V
V
ns
ns
ns
ns

L293B - L293E
F igure 1 :Switching Timers

Figure 2 : Saturation voltage versus Output
Current

Figure 3 : Source Saturation Voltage versus
Ambient Temperature

Figure 4 : Sink Saturation Voltage versus
Ambient Temperature

Figure 5 : Quiescent Logic Supply Current
versus Logic Supply Voltage

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L293B - L293E
F igure 6 : Output Voltage versus
Input Voltage

Figure 7 : Output Voltage versus
Inhibit...