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LT1032 Quad Low Power Line Driver
FEATURES
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DESCRIPTIO
Low Operating Voltage: 5V to 15V 500A 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 LT1032 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 LT1080 (dual), LT1039 (triple) or the LT1130 data sheets.
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
APPLICATI
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S
RS232 Power Supply Inverter Micropower Interface Level Translator
TYPICAL APPLICATI
1 2 3
RS232 Line Driver
-6V INPUT LT1032 14 13 12 11 6V STROBE* INPUT
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
Output Swing vs Output Current
V+ 0.2 0.4 VOUT 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
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VOUT LOW 6 8 4 OUTPUT CURRENT (mA) 10
LT1032 * TA02
UO
UO
1
LT1032 ABSOLUTE AXI U RATI GS
Operating Temperature Range LT1032C ............................................... 0C to 70C LT1032M ....................................... - 55C to 125C Guaranteed Functional by Design .......... - 25C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C 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
PACKAGE/ORDER I FOR ATIO
TOP VIEW VEE
(-15V TO -5V)
1 2 3
14
VCC
(5V TO 15V)
ORDER PART NUMBER LT1032CJ LT1032CN LT1032MJ
13 STROBE 12 11 RESPONSE 10 CONTROL 9 8
ON/OFF (0V TO 5V)
4 5 6
GND
7
N PACKAGE J PACKAGE 14-LEAD CERAMIC DIP 14-LEAD PLASTIC DIP
TJMAX = 85C, JA = 100C/W, JC = 60C (CJ) TJMAX = 85C, JA = 100C/W, JC = 60C (CN) TJMAX = 150C, JA = 100C/W, JC = 60C (MJ)
Consult factory for Industrial grade parts.
ELECTRICAL CHARACTERISTICS
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 2) Response Pin Leakage CONDITIONS
Supply Voltage = 5V to 15V
MIN q q V + - 0.3V 10 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 A A A V V mA A A V V V V A A A V/s % % A
VON/OFF 2.4V, IOUT = 0, All Outputs Low VON/OFF 0.4V VON/OFF 0.1V, TA = 125C Load = 2mA Positive Negative VSUPPLY = 5V to 15V VSUPPLY = 0V, VOUT = 30V VSUPPLY = 15V, VOUT = 20V Operating or Shutdown Operating of Shutdown Low Input (VOUT = High) High Input (VOUT = Low) VIN > 2.0V VIN < 0.8V 0 VIN 5V IRESPONSE = 0, RL = 3k IRESPONSE = 50A IRESPONSE = - 50A VSUPPLY = 6V, VON/OFF 0.4V VRESPONSE = 6V
The q denotes specifications which apply over the full operating temperature range. Note 1: 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
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TOP VIEW VEE 1 2 3 ON/OFF 4 5 6 GND 7 NC 8 16 VCC 15 STROBE 14 13 12 RESPONSE CONTROL 11 10 9 S PACKAGE 16-LEAD PLASTIC SOL NC
ORDER PART NUMBER LT1032CS
TJMAX = 85C, JA = 80C/W
q q q q
V + - 30V V- 2 1.4 1.4 2 10 3 15 50 - 50 1
q
-10 4
Note 2: Response can be changed by connecting a resistor to the supply. For supplies less than 6V this current is desconnected when shut down. Leave open when not used.
LT1032
TYPICAL PERFOR A CE CHARACTERISTICS
On Supply Current vs Temperature
3.0 2.5
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 VOUT HIGH
10A
OUTPUT CURRENT
RESPONSE PIN LEAKAGE (A)
1.0 0.8 0.6 0.4 0.2 V-
VOUT 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 (A)
4 2 0 -2 -4 -6 0 1 3 2 INPUT VOLTAGE (V) 4 5
UW
100
LT1032 * TPC01
LT1032 * TA02 LT1032 * TPC07
Supply Current vs Supply Voltage
2.0 1.8 1.6
100 1000
Off Supply Current vs Temperature
VS = 12V
ALL OUTPUTS HIGH
10
1
125
5
12.5 10 7.5 SUPPLY VOLTAGE (V)
15
LT1032 * TPC02
25
50
75
100
125
TEMPERATURE (C)
LT1032 * TPC03
Output Leakage vs Temperature
100A
1000
Response Pin Leakage vs Temperature (Device Off)
100
1A VOUT = -30V
100nA
10
V = 5V
V = -5V
10nA
VOUT = 30V
1nA
10
1
25
50
75 100 TEMPERATURE (C)
125
LT1032 * TPC05
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
3
LT1032
TYPICAL PERFOR A CE CHARACTERISTICS
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V) V+ 200 400
Output Swing vs Temperature
20
SLEW RATE (V/s)
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 RL = 3k VS = 6V CL = 51pF 5V/DIV OUTPUT HIGH 10V VOUT 5V 0 0 - 5V - 10V 5V 0
VOUT
VIN = 0V
VOUT
VIN = 5V
ON/OFF INPUT
0
200s
400s
Output Waveform
50V VOUT 0 - 5V RL = 3k CL = 51pF 4V 2V 0 - 2V - 4V
10V VS = 12V 0 VOUT - 10V LOGIC INPUT 5V 0 0 2s 4s 6s 8s 10s
LT1032 * TPC14
Output Waveform Driving Capacitive Load
6V 4V 2V 0 - 2V - 4V - 6V RL = 3.3k VS = 6V CL = 0.01F OUTPUT 0 5V/DIV
VOUT
LOGIC INPUT
5V 0
0
10s
20s
4
UW
600s 30s
Slew Rate vs Temperature
18 16 14 12 10 8 6 4 2 VS = 12V RL = 3k CL = 51pF VSLEW = 8V 50 25 0 75 TEMPERATURE (C) 100 125 FALLING RISING
IOUT = 2mA IOUT = 10mA
IOUT = -10mA
IOUT = -2mA
0 -50 -25
LT1032 * TPC11
ON/OFF Response Time
RL = 3k VS = 12V CL = 51pF
VIN = 0V
OUTPUT HIGH
OUTPUT LOW
VOUT
VIN = 5V
OUTPUT LOW
INPUT 1ms
LT1032 * TPC12
ON/OFF INPUT
0
200s
400s
600s
1ms
LT1032 * TPC13
Output Waveform
RL = 450 VS = 5V CL = 51pF
VOUT
LOGIC INPUT
5V 0 0 4s 8s 12s 16s 20s
LT1032 * TPC15
Strobe Pin Response
VIN = 0V
STROBE INPUT 40s 50s
LT1032 * TPC16
5V 0
RL = 3k VS = 12V CL = 51pF 0 2s 4s 6s 8s
LT1032 * TPC17
LT1032
PI FU CTI
VEE (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) VIN 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 2k 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+ 100 TO 1000 INPUT 1/4 LT1032 TO LINE
INPUT 1/4 LT1032 TO LINE
V
-
LT1032 * TA03a
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W
UO
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UO
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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. VCC (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 response pin and the power supplies to drive 50A to 100A 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 connected in series with the resistor to limit the voltage applied to the response pin to 6V. Also, for temperatures above 100C, 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 transistors (typically about 50V). The LT1032 is usually immune to ESD up to 2500V on the outputs with no damage.
30V ZENERS
LT1032 * TA03b
5
LT1032
TYPICAL APPLICATI
15V
FET Driver
INPUT
1/4 LT1032
-15V
TTL/CMOS Compatible Strobe
5V
TTL INPUT 10k
1/4 LT1032 C C
CMOS INPUT
6
UO
S
Slew Rate Adjustment*
10V 5V
50k
15V 80k 80k 50A INCREASES SLEW RATE
LT1032
LT1032 * TA04
PIN 10
OR
OR DECREASES SLEW RATE
120k -5V
120k
50A -15V
*ABOUT 4V/ms CHANGE ZENERS PREVENT LEAKAGE DURING SHUTDOWN
10V
LT1032 * TA05
Strobing with CMOS
TO LT1032 STROBE
LT1032 * TA06
TTL INPUT
ANY CMOS GATE
TO PIN 13 OF LT1032
LT1032 * TA07
Phase Shift Oscillator
R
R 1/4 LT1032
R 1/4 LT1032 C
R f=
1 3.3RC
LT1032 * TA09
Operating from a Single 5V Supply
5V
1 40k* 15k*
VEE
LT1032
VCC ON/OFF
14 4
OUTPUT 0.7V TO 4.8V
7
GND
LT1032 * TA10
1N4148 1N4148
*LEVEL SHIFTING RESISTORS NEEDED FOR EACH INPUT
LT1032
TYPICAL APPLICATI UO
Q11 Q5 Q4 GND Q10 D1 R6 7.2k R7 21.5k R8 1k R11 120 Q21 Q31 2k V-
LT1032 * SS
S
5V to 15V Voltage Multiplier
5V
LT1032 1N4148
470F
1N4148
+
470F fCLK = 1kHz 5V 0V 470F 1N4148
VOUT 13.7V AT NO LOAD 12V AT 10mA
1N4148
-5V
SI PLIFIED SCHE ATIC
LOGIC INPUT V+ R9 2k R10 2k Q9 Q25 R12 30k Q8 R1 50k Q7 R4 2k Q1 Q2 Q17 ON/OFF Q3 Q6 Q12 Q15 Q16 D2 Q22 Q27 Q28 Q30 R18 5k Q34 R17 7.5k Q39 Q40 D3 Q18 Q20 Q23 Q14 Q24 Q26 Q29 Q33 C2 3pF Q36 D4 Q32 R14 2k Q13 Q19 R13 2k 1 OF 4 DRIVERS Q37 OUTPUT
R5 600
RESPONSE TIME ADJ
STROBE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
+
+ +
-VOUT -13.7V AT NO LOAD 470F -12V AT 10mA
LT1032 * TA08
W
W
C1 10pF
R16 3
7
LT1032
PACKAGE DESCRIPTIO
CORNER LEADS OPTION (4 PLCS)
0.300 BSC (0.762 BSC)
0.023 - 0.045 (0.584 - 1.143) HALF LEAD OPTION 0.045 - 0.068 (1.143 - 1.727) FULL LEAD OPTION
0.008 - 0.018 (0.203 - 0.457) 0.385 0.025 (9.779 0.635)
0 - 15 1 0.045 - 0.068 (1.143 - 1.727) 0.014 - 0.026 (0.360 - 0.660) 0.100 0.010 (2.540 0.254) 0.125 (3.175) MIN 2 3 4 5 6 7
J14 0694
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP OR TIN PLATE LEADS.
0.300 - 0.325 (7.620 - 8.255)
0.130 0.005 (3.302 0.127) 0.015 (0.380) MIN
0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 -0.015 +0.635 8.255 -0.381
(
)
0.125 (3.175) MIN
0.100 0.010 (2.540 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTURSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm).
0.005 (0.127) RAD MIN
0.291 - 0.299 (7.391 - 7.595) (NOTE 2) 0.010 - 0.029 x 45 (0.254 - 0.737)
0.093 - 0.104 (2.362 - 2.642)
0 - 8 TYP
0.009 - 0.013 (0.229 - 0.330)
NOTE 1 0.016 - 0.050 (0.406 - 1.270)
NOTE: 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS. 2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
U
Dimensions in inches (millimeters) unless otherwise noted. J Package 14-Lead Ceramic DIP
0.200 (5.080) MAX 0.015 - 0.060 (0.381 - 1.524)
0.005 (0.127) MIN
0.785 (19.939) MAX 14 13 12 11 10 9 8
0.025 (0.635) RAD TYP
0.220 - 0.310 (5.588 - 7.874)
N Package 14-Lead Plastic DIP
0.045 - 0.065 (1.143 - 1.651) 0.770* (19.558) MAX 14 13 12 11 10 9 8
0.065 (1.651) TYP 0.075 0.015 (1.905 0.381) 0.018 0.003 (0.457 0.076)
0.255 0.015* (6.477 0.381)
1
2
3
4
5
6
7
N14 0694
S Package 16-Lead Plastic SOL
0.398 - 0.413 (10.109 - 10.490) (NOTE 2) 0.037 - 0.045 (0.940 - 1.143) 16 15 14 13 12 11 10 9
0.050 (1.270) TYP
0.004 - 0.012 (0.102 - 0.305)
NOTE 1
0.394 - 0.419 (10.007 - 10.643)
0.014 - 0.019 (0.356 - 0.482) TYP
1
2
3
4
5
6
7
8
SOL16 0392
LT/GP 0894 1K REV C * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1994

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