LT1032
Quad Low Power
Line Driver
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
Low Operating Voltage:
±5V
to
±15V
500µA Supply Current
Zero Supply Current when Shut Down
Outputs Can Be Driven
±30V
Thermal Limiting
Output “Open” when Off (Three-State)
10mA Output Drive
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
RS232
Power Supply Inverter
Micropower Interface
Level Translator
TYPICAL APPLICATIO
1
2
3
LT1032
RS232 Line Driver
–6V
INPUT
14
13
12
11
6V
STROBE*
INPUT
Output Swing vs Output Current
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
V
+
0.2
0.4
V
OUT
HIGH
OUTPUT
ON/OFF 4
(0V TO 5V)
†
5
INPUT
6
OUTPUT
7
GND
OUTPUT
10 RESPONSE TIME
CONTROL*
9
INPUT
8
OUTPUT
1.0
0.8
0.6
0.4
0.2
V
–
0
2
*NO CONNECTION NEEDED WHEN NOT USED
†
5V = ON
LT1032 • TA01
U
V
OUT
LOW
6
8
4
OUTPUT CURRENT (mA)
10
LT1032 • TA02
U
U
1
LT1032
ABSOLUTE
AXI U
RATI GS
(Note 1)
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
EE
(–15V TO –5V)
1
2
3
14
V
CC
(5V TO 15V)
ORDER PART
NUMBER
LT1032CJ
LT1032CN
LT1032IN
LT1032MJ
13 STROBE
12
11
RESPONSE
10 CONTROL
9
8
N PACKAGE
14-LEAD PDIP
ON/OFF
(0V TO 5V)
4
5
6
GND
7
J PACKAGE
14-LEAD CERDIP
T
JMAX
= 85°C,
θ
JA
= 100°C/W,
θ
JC
= 60°C (CJ)
T
JMAX
= 85°C,
θ
JA
= 100°C/W,
θ
JC
= 60°C (CN)
T
JMAX
= 150°C,
θ
JA
= 100°C/W,
θ
JC
= 60°C (MJ)
range, otherwise specifications are at T
A
= 25°C. Supply voltage =
±5V
to
±15V
PARAMETER
Supply Current
Power Supply Leakage Current
Output Voltage Swing
Output Current (Active)
Output Current (Shutdown)
Output Overload Voltage (Forced)
Input Overload Voltage (Forced)
Logic Input Levels
Logic Input Current
ON/OFF Pin Current
Slew Rate
Change in Slew Rate (Note 3)
Response Pin Leakage
CONDITIONS
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature
MIN
q
q
V
ON/OFF
≥
2.4V, I
OUT
= 0, All Outputs Low
V
ON/OFF
≤
0.4V
V
ON/OFF
≤
0.1V, T
A
= 125°C
Load = 2mA Positive
Negative
V
SUPPLY
=
±5V
to
±15V
V
SUPPLY
= 0V, V
OUT
=
±30V
V
SUPPLY
=
±15V,
V
OUT
=
±20V
Operating or Shutdown
Operating of Shutdown
Low Input (V
OUT
= High)
High Input (V
OUT
= Low)
V
IN
> 2.0V
V
IN
< 0.8V
0
≤
V
IN
≤
5V
I
RESPONSE
= 0, R
L
= 3k
I
RESPONSE
= 50µA
I
RESPONSE
= – 50µA
V
SUPPLY
=
±6V,
V
ON/OFF
≤
0.4V
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.
2
U
U
W
W W
U
W
TOP VIEW
V
EE
1
2
3
ON/OFF 4
5
6
GND 7
NC 8
16 V
CC
15 STROBE
14
13
12 RESPONSE
CONTROL
11
10
9
NC
ORDER PART
NUMBER
LT1032CSW
LT1032ISW
SW PACKAGE
16-LEAD PLASTIC SO (WIDE)
T
JMAX
= 85°C,
θ
JA
= 80°C/W
TYP
500
1
10
V
+
– 0.1V
V
–
+ 0.7V
22
2
2
MAX
1000
10
50
V
–
+ 0.9V
100
100
V
–
+ 30V
30V
0.8
20
20
50
30
UNITS
µA
µA
µA
V
V
mA
µA
µA
V
V
V
V
µA
µA
µA
V/µs
%
%
µA
V
+
– 0.3V
10
q
q
q
q
V
+
– 30V
V
–
2
1.4
1.4
2
10
3
15
50
– 50
1
q
–10
4
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.
LT1032
TYPICAL PERFOR A CE CHARACTERISTICS
On Supply Current
vs Temperature
3.0
2.5
2.0
1.8
1.6
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
2.0
1.5
1.0
0.5
0
–50 –25
ALL OUTPUTS HIGH
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
ALL OUTPUTS LOW
SUPPLY CURRENT (nA)
ALL OUTPUTS LOW
50
25
75
0
TEMPERATURE (˚C)
Output Swing vs Output Current
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
V
+
0.2
0.4
10µA
OUTPUT CURRENT
RESPONSE PIN LEAKAGE (µA)
V
OUT
HIGH
1.0
0.8
0.6
0.4
0.2
V
–
V
OUT
LOW
0
2
6
8
4
OUTPUT CURRENT (mA)
ON/OFF Pin Current vs Voltage
10
8
ON/OFF PIN VOLTAGE (V)
6
OUTPUT CURRENT (mA)
CURRENT (µA)
4
2
0
–2
–4
–6
0
1
3
2
INPUT VOLTAGE (V)
4
5
U W
100
LT1032 • TPC01
Supply Current
vs Supply Voltage
1000
ALL OUTPUTS HIGH
Off Supply Current
vs Temperature
V
S
=
±12V
100
10
1
5
12.5
10
7.5
SUPPLY VOLTAGE (±V)
15
LT1032 • TPC02
125
25
50
75
100
125
TEMPERATURE (°C)
LT1032 • TPC03
Output Leakage vs Temperature
100µA
1000
Response Pin Leakage
vs Temperature (Device Off)
100
1µA
V
OUT
= –30V
100nA
10
V = 5V
V = –5V
10nA
V
OUT
= 30V
1nA
1
25
50
75
100
TEMPERATURE (°C)
125
LT1032 • TPC05
10
LT1032 • TA02
25
50
75
100
LT1032 • G06
TEMPERATURE (°C)
Shutdown Pin Voltage
vs Temperature
2.0
1.8
1.6
MIN ON VOLTAGE
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
LT1032 • TPC08
Current Limit vs Temperature
80
70
60
50
SINKING
40
30
20
10
0
– 55 – 25
0
25 50 75 100 125 150
TEMPERATURE (°C)
LT1032 • TPC09
MAX OFF VOLTAGE
SOURCING
LT1032 • TPC07
3
LT1032
TYPICAL PERFOR A CE CHARACTERISTICS
Output Swing vs Temperature
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
V
+
200
400
I
OUT
= 2mA
I
OUT
= 10mA
SLEW RATE (V/µs)
1
800
600
400
200
V
–
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
LT1032 • TPC10
ON/OFF Response Time
6V
4V
2V
0
0
– 2V
– 4V
– 6V
5V
0
R
L
= 3k
V
S
=
±6V
C
L
= 51pF
5V/DIV
OUTPUT HIGH
10V
V
OUT
5V
0
0
– 5V
– 10V
5V
0
V
OUT
V
IN
= 0V
V
OUT
V
IN
= 5V
ON/OFF
INPUT
0
200µs
400µs
Output Waveform
50V
V
OUT
0
– 5V
10V
0
– 10V
5V
0
0
2µs
4µs
6µs
8µs
10µs
LT1032 • TPC14
V
S
=
±12V
V
OUT
LOGIC
INPUT
Output Waveform Driving
Capacitive Load
6V
4V
2V
0
– 2V
– 4V
– 6V
R
L
= 3.3k
V
S
=
±6V
C
L
= 0.01µF
OUTPUT
0
5V/DIV
V
OUT
LOGIC
INPUT
5V
0
0
10µs
20µs
4
U W
600µs
30µs
Slew Rate vs Temperature
20
18
16
14
12
10
8
6
4
2
V
S
=
±12V
R
L
= 3k
C
L
= 51pF
V
SLEW
=
±8V
50
25
0
75
TEMPERATURE (°C)
100
125
FALLING
RISING
I
OUT
= –10mA
I
OUT
= –2mA
0
–50 –25
LT1032 • TPC11
ON/OFF Response Time
R
L
= 3k
V
S
=
±12V
C
L
= 51pF
V
IN
= 0V
OUTPUT HIGH
OUTPUT LOW
V
OUT
V
IN
= 5V
OUTPUT LOW
INPUT
1ms
LT1032 • TPC12
ON/OFF
INPUT
0
200µs
400µs
600µs
1ms
LT1032 • TPC13
Output Waveform
R
L
= 3k
C
L
= 51pF
4V
2V
0
– 2V
– 4V
R
L
= 450Ω
V
S
=
±5V
C
L
= 51pF
V
OUT
LOGIC
INPUT
5V
0
0
4µs
8µs
12µs
16µs
20µs
LT1032 • TPC15
Strobe Pin Response
V
IN
= 0V
STROBE
INPUT
40µs
50µs
LT1032 • TPC16
5V
0
R
L
= 3k
V
S
=
±12V
C
L
= 51pF
0
2µs
4µs
6µs
8µs
LT1032 • TPC17
LT1032
PI FU CTI
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
+
.
APPLICATI
S 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 2kΩ to ground. Driving the strobe
pin positive forces the output stages low–even if the device
is shut off. Under worst case conditions, 3V minimum at
2mA are needed driving the strobe pin to insure strobing.
TYPICAL APPLICATI
S
Protecting Against More Than
±30V
Output Overload
V
+
100Ω TO
1000Ω
INPUT
1/4 LT1032
TO LINE
V
–
LT1032 • TA03a
U
W
UO
U
UO
UO
U
U
S
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.
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 50µA to 100µA
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.
INPUT
1/4 LT1032
TO LINE
30V ZENERS
LT1032 • TA03b
5
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