1
LT1032
Quad Low Power
Line Driver
s
Low Operating Voltage:
5V to
15V
s
500
A Supply Current
s
Zero Supply Current when Shut Down
s
Outputs Can Be Driven
30V
s
Thermal Limiting
s
Output "Open" when Off (Three-State)
s
10mA Output Drive
s
Pinout Similar to 1488
The LT
1032 is a RS232 and RS423 line driver that
operates over a
5V to
15V range on low supply current
and can be shut down to zero supply current. Outputs are
fully protected from externally applied voltages of
30V by
both current and thermal limiting. Since the output swings
to within 200mV of the positive supply and 600mV of the
negative supply, power supply needs are minimized.
Also included is a strobe pin to force all outputs low
independent of input or shutdown conditions. Further,
slew rate can be adjusted with a resistor connected to the
supply.
A major advantage of the LT1032 is the high impedance
output state when off or powered down.
For applications requiring dual or triple RS232 driver/
receiver devices, see the LT1180A (dual), LT1039A (triple)
or the LT1130A data sheets.
s
RS232
s
Power Supply Inverter
s
Micropower Interface
s
Level Translator
RS232 Line Driver
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
0.4
V
+
8
LT1032 TA02
0.8
0.4
V
2
4
6
10
0.2
1.0
0.6
0.2
V
OUT
HIGH
V
OUT
LOW
1
2
3
4
5
6
7
14
13
12
11
10
9
8
6V
INPUT
OUTPUT
INPUT
OUTPUT
GND
6V
STROBE*
INPUT
OUTPUT
INPUT
OUTPUT
RESPONSE TIME
CONTROL*
ON/OFF
(0V TO 5V)
*NO CONNECTION NEEDED WHEN NOT USED
5V = ON
LT1032 TA01
LT1032
Output Swing vs Output Current
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
LT1032
ORDER PART
NUMBER
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
Operating Temperature Range
LT1032C ............................................... 0
C to 70
C
LT1032I ........................................... 40
C to 85
C
LT1032M ....................................... 55
C to 125
C
C Grade Guaranteed
Functional by Design .............................. 25
C to 85
C
Lead Temperature (Soldering, 10 sec)................. 300
C
Supply Voltage .....................................................
15V
Logic Input Pins ............................................ V
to 25V
ON/OFF Pin ................................................. GND to 15V
Output (Forced) ............................. V
+ 30V, V
+
30V
Response Pin .........................................................
6V
Short-Circuit Duration (to
30V) .................... Indefinite
Storage Temperature Range ................ 65
C to 150
C
W
U
U
PACKAGE/ORDER I FOR ATIO
LT1032CJ
LT1032CN
LT1032IN
LT1032MJ
ORDER PART
NUMBER
LT1032CSW
LT1032ISW
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO (WIDE)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
EE
ON/OFF
GND
NC
V
CC
STROBE
NC
RESPONSE
CONTROL
1
2
3
4
5
6
7
TOP VIEW
J PACKAGE
14-LEAD CERDIP
N PACKAGE
14-LEAD PDIP
14
13
12
11
10
9
8
GND
STROBE
ON/OFF
(0V TO 5V)
RESPONSE
CONTROL
V
EE
(15V TO 5V)
V
CC
(5V TO 15V)
ELECTRICAL C
C
HARA TERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current
V
ON/OFF
2.4V, I
OUT
= 0, All Outputs Low
q
500
1000
A
Power Supply Leakage Current
V
ON/OFF
0.4V
1
10
A
V
ON/OFF
0.1V, T
A
= 125
C
q
10
50
A
Output Voltage Swing
Load = 2mA
Positive
V
+
0.3V
V
+
0.1V
V
Negative
V
+ 0.7V
V
+ 0.9V
V
Output Current (Active)
V
SUPPLY
=
5V to
15V
10
22
mA
Output Current (Shutdown)
V
SUPPLY
= 0V, V
OUT
=
30V
2
100
A
V
SUPPLY
=
15V, V
OUT
=
20V
2
100
A
Output Overload Voltage (Forced)
Operating or Shutdown
q
V
+
30V
V
+ 30V
V
Input Overload Voltage (Forced)
Operating of Shutdown
q
V
30V
V
Logic Input Levels
Low Input (V
OUT
= High)
q
1.4
0.8
V
High Input (V
OUT
= Low)
q
2
1.4
V
Logic Input Current
V
IN
> 2.0V
2
20
A
V
IN
< 0.8V
10
20
A
ON/OFF Pin Current
0
V
IN
5V
q
10
3
50
A
Slew Rate
I
RESPONSE
= 0, R
L
= 3k
4
15
30
V/
s
Change in Slew Rate (Note 3)
I
RESPONSE
= 50
A
50
%
I
RESPONSE
= 50
A
50
%
Response Pin Leakage
V
SUPPLY
=
6V, V
ON/OFF
0.4V
1
A
V
RESPONSE
=
6V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: 3V applied to the strobe pin will force all outputs low. Strobe pin
input impedance is about 2k to ground. Leave open when not used.
Note 3: Response can be changed by connecting a resistor to the supply.
For supplies less than
6V this current is disconnected when shut down.
Leave open when not used.
T
JMAX
= 85
C,
JA
= 100
C/W,
JC
= 60
C (CJ)
T
JMAX
= 85
C,
JA
= 100
C/W,
JC
= 60
C (CN)
T
JMAX
= 150
C,
JA
= 100
C/W,
JC
= 60
C (MJ)
T
JMAX
= 85
C,
JA
= 80
C/W
(Note 1)
The
q
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25
C. Supply voltage =
5V to
15V
3
LT1032
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
TEMPERATURE (
C)
25
1
SUPPLY CURRENT (nA)
100
1000
50
100
125
LT1032 TPC03
10
75
V
S
=
12V
SUPPLY VOLTAGE (
V)
5
0
SUPPLY CURRENT (mA)
0.2
0.6
0.8
1.0
2.0
1.4
7.5
10
LT1032 TPC02
0.4
1.6
1.8
1.2
12.5
15
ALL OUTPUTS HIGH
ALL OUTPUTS LOW
On Supply Current
vs Temperature
Supply Current
vs Supply Voltage
Off Supply Current
vs Temperature
Response Pin Leakage
vs Temperature (Device Off)
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
0.4
V
+
8
LT1032 TA02
0.8
0.4
V
2
4
6
10
0.2
1.0
0.6
0.2
V
OUT
HIGH
V
OUT
LOW
Output Swing vs Output Current
TEMPERATURE (
C)
100nA
OUTPUT CURRENT
25
75
100
LT1032 TPC05
10nA
50
125
1nA
100
A
10
A
1
A
V
OUT
= 30V
V
OUT
= 30V
Output Leakage vs Temperature
TEMPERATURE (
C)
25
1
RESPONSE PIN LEAKAGE (
A)
100
1000
50
75
100
LT1032 G06
10
V = 5V
V = 5V
Shutdown Pin Voltage
vs Temperature
INPUT VOLTAGE (V)
0
CURRENT (
A)
6
10
4
LT1032 TPC07
2
2
6
1
2
3
5
4
8
0
4
ON/OFF Pin Current vs Voltage
TEMPERATURE (
C)
50
0
ON/OFF PIN VOLTAGE (V)
0.2
0.6
0.8
1.0
2.0
1.4
0
50
75
LT1032 TPC08
0.4
1.6
1.8
1.2
25
25
100 125
150
MIN ON VOLTAGE
MAX OFF VOLTAGE
TEMPERATURE (
C)
55
OUTPUT CURRENT (mA)
40
50
60
150
LT1032 TPC09
30
20
0
0
50
100
10
80
70
25
25
75
125
SINKING
SOURCING
Current Limit vs Temperature
TEMPERATURE (C)
50
SUPPLY CURRENT (mA)
2.0
2.5
3.0
25
75
LT1032 TPC01
1.5
1.0
25
0
50
100
125
0.5
0
ALL OUTPUTS HIGH
ALL OUTPUTS LOW
4
LT1032
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Output Swing vs Temperature
Slew Rate vs Temperature
TEMPERATURE (
C)
50
0
SLEW RATE (V/
s)
2
6
8
10
20
14
0
50
75
LT1032 TPC11
4
16
18
12
25
25
100
125
RISING
FALLING
V
S
=
12V
R
L
= 3k
C
L
= 51pF
V
SLEW
=
8V
Output Waveform Driving
Capacitive Load
0
10
s
20
s
30
s
40
s
LT1032 TPC16
50
s
Output Waveform
10V
0
0
LOGIC
INPUT
10V
5V
0
2
s
4
s
6
s
8
s
LT1032 TPC14
10
s
V
S
=
12V
V
OUT
INPUT
ON/OFF Response Time
6V
4V
2V
0
0
4V
6V
5V
0
0
200
s
400
s
600
s
OUTPUT LOW
OUTPUT HIGH
V
OUT
V
OUT
ON/OFF
INPUT
2V
1ms
LT1032 TPC12
OUTPUT LOW
OUTPUT HIGH
ON/OFF Response Time
5V
0
0
5V
0
10V
ON/OFF
INPUT
10V
5V
V
OUT
V
OUT
5V/DIV
0
200
s
400
s
600
s
1ms
LT1032 TPC13
V
OUT
0
LOGIC
INPUT
5V
4
s
8
s
12
s
16
s
LT1032 TPC15
20
s
0
2V
4V
0
2V
4V
Output Waveform
0
5V
50V
V
OUT
5V
0
LOGIC
INPUT
0
2V
4V
6V
2V
4V
6V
V
OUT
Strobe Pin Response
0
4
s
6
s
8
s
LT1032 TPC17
2
s
5V
0
0
5V/DIV
OUTPUT
STROBE
INPUT
R
L
= 3k
V
S
=
6V
C
L
= 51pF
V
IN
= 0V
V
IN
= 5V
R
L
= 3k
C
L
= 51pF
R
L
= 3.3k
V
S
=
6V
C
L
= 0.01
F
R
L
= 3k
V
S
=
12V
C
L
= 51pF
V
IN
= 0V
V
IN
= 5V
R
L
= 450
V
S
=
5V
C
L
= 51pF
R
L
= 3k
V
S
=
12V
C
L
= 51pF
V
IN
= 0V
TEMPERATURE (C)
50
V
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
200
600
800
1
V
+
0
50
75
LT1032 TPC10
400
400
200
25
25
100 125
150
I
OUT
= 2mA
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 2mA
5
LT1032
PI
U
FU
U
C
U
S
O
TI
V
EE
(J, N & S: Pin 1): Minus Supply. Operates 2V to 15V.
(J & N: Pins 2, 5, 9, 12/S: Pins 2, 5, 11, 14): Logic
Input. Operates properly on TTL or CMOS levels. Output
valid form (V
+ 2V)
V
IN
15V. Connect to ground
when not used.
(J & N: Pins 3, 6, 8, 11/S: Pins 3, 6, 10, 13):
Output. Line
drive output.
ON/OFF (J, N & S: Pin 4):
Shuts down entire circuit.
Cannot be left open. For "normally on" operation, connect
to V
+
.
GND (J, N & S: Pin 7): Ground. Ground must be more
positive than V
.
Response Control (J & N: Pin 10/S: Pin 12): Allows
limited change of slew rate. Leave open when not used.
Strobe (J & N: Pin 13/ S: Pin 15): Forces all outputs low.
Drive with 3V.
V
CC
(J & N:Pin 14/S: Pin 15): Positive Supply. Operates 5V
to 15V.
TO LINE
1/4 LT1032
LT1032 TA03b
30V ZENERS
INPUT
V
+
V
100
TO
1000
TO LINE
1/4 LT1032
LT1032 TA03a
INPUT
The response pin can be used to make some adjustment
in slew rate. A resistor can be connected between the re-
sponse pin and the power supplies to drive 50
A to 100
A
into the pin. The response pin is a low impedance point
operating at about 0.75V above ground. For supply voltage
up to
6V, current is turned off when the device is turned
off. For higher supply voltages, a Zener should be con-
nected in series with the resistor to limit the voltage applied
to the response pin to 6V. Also, for temperatures above
100
C, using the response pin is not recommended. The
leakage current into the response pin at high temperatures
is excessive.
Outputs are well protected against shorts or externally
applied voltage. Tested limits are
30V, but the device can
withstand external voltages up to breakdown of the tran-
sistors (typically about 50V). The LT1032 is usually immune
to ESD up to 2500V on the outputs with no damage.
U
S
A
O
PPLICATI
W
U
U
I FOR ATIO
Application Hints
The LT1032 is exceptionally easy to use when compared
to older drivers. Operating supply voltage can be as low as
3V or as high as
15V. Input levels are referred to ground.
The logic inputs are internally set at TTL levels. Outputs are
valid for input voltages from 1V above V
to 25V. Driving
the logic inputs to V
turns off the output stage. The
ON/OFF control completely turns off all supply current of
the LT1032. The levels required to drive the device on or
off are set by internal emitter-based voltages. Since the
current into the ON/OFF pin is so low, TTL or CMOS drivers
have no problem controlling the device.
The strobe pin is not fully logic compatible. The impedance
of the strobe pin is about 2k
to ground. Driving the strobe
pin positive forces the output stages loweven if the device
is shut off. Under worst case conditions, 3V minimum at
2mA are needed driving the strobe pin to insure strobing.
U
S
A
O
PPLICATI
TYPICAL
Protecting Against More Than
30V Output Overload
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