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LT1080/LT1081 Advanced Low Power 5V RS232 Dual Driver/Receiver
FEATURES
s
DESCRIPTIO
s s s s s s
Superior to CMOS - Improved Speed: Operates over 120kBaud - Improved Protection: Outputs Can Be Forced to 30V without Damage - Three-State Outputs Are High Impedance When Off - Only Needs 1F Capacitors Absolutely No Latchup CMOS Comparable Low Power: 60mW Can Power Additional RS232 Drivers: 10mA Supply Current in Shutdown: 1A Available in SO Package Available with or without Shutdown
The LT(R)1080/LT1081 are the only dual RS232 driver/ receiver with charge pump to guarantee absolutely no latchup. These interface optimized devices provide a realistic balance between CMOS levels of power dissipation and real world requirements for ruggedness. The driver outputs are fully protected against overload and can be shorted to 30V. Unlike CMOS, the advanced architecture of the LT1080/LT1081 does not load the signal line when "shut down" or when power is off. Both the receiver and RS232 outputs are put into a high impedance state. An advanced output stage allows driving higher capacitive loads at higher speeds with exceptional ruggedness against ESD. For applications requiring up to five drivers and five receivers with charge pump in one package see the LT1130A Series data sheet. A version of the LT1080/LT1081, the LT1180A and LT1181A that use only 0.1F capacitors, is also available. All of Linear Technology's RS232 ICs are available in standard surface mount packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s s
Portable Computers Battery-Powered RS232 Systems Power Supply Generator Terminals Modems
TYPICAL APPLICATIO
2 1F 4 LT1080 5 1F 6 12 LOGIC INPUTS 15 7 17 3
5V INPUT 9V OUTPUT 1F -9V OUTPUT
Supply Generator Outputs
10 8 RL TO V - V + OUTPUT RL TO GND
OUTPUT VOLTAGE (V)
1F RS232 OUTPUT
6 4 2 0 -2 -4 -6
VCC = 5V
11 13
8 14 5k
RS232 OUTPUT RS232 INPUT
LOGIC OUTPUTS 10 18
RL TO V + V - OUTPUT 0 2 4
9 5k 16
-8
RS232 INPUT
-10
ON/OFF
1080/81 * TA01
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RL TO GND 6 8 10 12 14 16 18 20 OUTPUT CURRENT (mA)
1080/81 TA01a
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1
LT1080/LT1081 ABSOLUTE AXI U RATI GS
Supply Voltage (VCC) ................................................. 6V V + ........................................................................................... 12V V - ....................................................................................... -12V Input Voltage Driver ........................................................... V - to V + Receiver ................................................. -30V to 30V ON/OFF Pin .............................................. GND to 12V Output Voltage Driver ................................. (V - + 30V) to (V + - 30V) Receiver .................................. -0.3V to (VCC + 0.3V)
PACKAGE/ORDER I FOR ATIO
TOP VIEW NC C1+ V+ C1- C2 + C2 - V- TR2 OUT REC2 IN 1 2 3 4 5 6 7 8 9 LT1080 18 ON/OFF 17 VCC 16 GND 15 TR1 OUT 14 REC1 IN 13 REC1 OUT 12 TR1 IN 11 TR2 IN 10 REC2 OUT N PACKAGE 18-LEAD PDIP
ORDER PART NUMBER LT1080CJ LT1080CN LT1080CSW LT1080IN LT1080ISW LT1080MJ
J PACKAGE 18-LEAD CERDIP
SW PACKAGE 18-LEAD PLASTIC SO WIDE
TJMAX = 150C, JA = 100C/W, JC = 40C/W (J) TJMAX = 150C, JA = 120C/W, JC = 50C/W (N) TJMAX = 150C, JA = 90C/W, JC = 26C/W (SW)
2
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W
WW
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W
(Note 1)
Short-Circuit Duration V + ...................................................................................... 30 sec V - ...................................................................................... 30 sec Driver Output ............................................... Indefinite Receiver Output ........................................... Indefinite Operating Temperature Range LT1080C/LT1081C ................................. 0C to 70C LT1080I/LT1081I ................................ -40C to 85C LT1080M/LT1081M .......................... -55C to 125C Storage Temperature Range ..................-65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
TOP VIEW C1+ V+ C1- C2 + C2 - V- TR2 OUT REC2 IN 1 2 3 4 5 6 7 8 LT1081 16 VCC 15 GND 14 TR1 OUT 13 REC1 IN 12 REC1 OUT 11 TR1 IN 10 TR2 IN 9 REC2 OUT
ORDER PART NUMBER LT1081CJ LT1081CN LT1081CSW LT1081IN LT1081ISW LT1081MJ
J PACKAGE 16-LEAD CERDIP
N PACKAGE 16-LEAD PDIP
SW PACKAGE 16-LEAD PLASTIC SO WIDE
TJMAX = 150C, JA = 100C/W, JC = 40C/W (J) TJMAX = 150C, JA = 120C/W, JC = 50C/W (N) TJMAX = 150C, JA = 95C/W, JC = 27C/W (SW)
LT1080/LT1081
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 2)
PARAMETER Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Output Leakage Current Data Rate (Note 6) Slew Rate Receiver Input Voltage Thresholds Input Low Threshold Input High Threshold Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current Power Supply Generator (Note 4) V + Output Voltage IOUT = 0mA IOUT = 10mA IOUT = 15mA IOUT = 0mA IOUT = -10mA IOUT = -15mA
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN Positive Negative
q q q q q q
TYP 7.3 -6.5 1.4 1.4 5 5
MAX
UNITS V V
Load = 3k to GND Both Outputs Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN 2V VIN 0.8V Sourcing Current, VOUT = 0V Sinking Current, VOUT = 0V SHUTDOWN (Note 3), VOUT = 30V RL = 3k, CL = 2500pF RL = 3k, CL = 1000pF RL = 3k, CL = 51pF
5 -5 2
0.8 20 20
V V A A mA mA
9 -9
q
12 -12 10 100
A kBd kBd
120 250 4 Commercial Industrial and Military Commercial Industrial and Military
q q q q q
15 1.3 1.3 1.7 1.7
30
V/s V V
0.8 0.2
2.4 3.0 1 7 0.4
V V V k V V mA mA
0.1 3
0.4 5 0.2 4.8 -20 1 1
VIN = 10V Output Low, IOUT = -1.6mA Output High, IOUT = 160A (VCC = 5V) Sinking Current, VOUT = VCC Sourcing Current, VOUT = 0V SHUTDOWN (Note 3), 0V VOUT VCC
q q q
3.5 -10 0.6
10
A V V V V V V
8.0 7.0 6.5 -7.5 -5.5 -5.0
q q
9.0 8.0 7.5 -8.5 -6.5 -6.0 12 1 22 100 80 1
V - Output Voltage
Supply Current Supply Leakage Current (VCC) ON/OFF Pin Current Supply Rise Time SHUTDOWN (Note 3), LT1080 Only 0V VON/OFF 5V, LT1080 Only (Note 5), LT1080 Only
mA A A ms
-15
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: These parameters apply for 4.5V VCC 5.5V and VON/OFF = 3V, unless otherwise specified. Note 3: VON/OFF = 0.4V for -55C TA 50C, and VON/OFF = 0.2V for 50C TA 125C. (LT1080 only)
Note 4: Unless otherwise specified, VCC = 5V, external loading of V + and V - equals zero and the driver outputs are low (inputs high). Note 5: Time from either SHUTDOWN high or power on until V + 6V and V - -6V. All external capacitors are 1F. Note 6: Data rate operation guaranteed by slew rate, short-circuit current and propagation delay tests.
3
LT1080/LT1081
PI FU CTIO S
C1+; C1-; C2+; C2 - (Pins 2, 4, 5, 6): Requires an external capacitor (1F) from C1 + to C1 - and another from C2 + to C2 -. Pin 2 can be used for connecting a second positive supply. When a separate positive supply is used, C1 can be deleted. V + (Pin 3): Positive Supply for RS232 Drivers. V + 2VCC - 1.5V. Requires an exterenal capacitor (1F) for charge storage. May be loaded (up to 15mA) for external system use. Loading does reduce V + voltage (see graphs). Capacitor may be tied to ground or +5V input supply. With multiple transceivers, the V + and V - pins may be paralleled into common capacitors. V - (Pin 7): Negative Supply for RS232 Drivers. V - -(2VCC - 2.5V). Requires an external capacitor (1F) for charge stroage. May be loaded (up to -15mA) for external system use. Loading does reduce V - voltage (see graphs). With multiple transceivers, the V + and V - pins may be paralleled into common capacitors. TR2 OUT; TR1 OUT (Pins 8, 15): Driver Outputs with RS232 Voltage Levels. Outputs are in a high impedance state when in the SHUTDOWN mode or when power is off (VCC = 0V) to allow data line sharing. Outputs are fully short-circuit protected from (V - + 30V) to (V + - 30V) with power on, off or in the SHUTDOWN mode. Typical output breakdowns are greater than 45V and higher applied
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
10 8 VCC = 5.5V OUTPUT HIGH 10 8
DRIVER OUTPUT VOLTAGE (V)
6 4 2 0 -2 -4 -6 -8
4 2 0 -2 -4 -6 -8 -10 LOADED TO V + LOADED TO GROUND VCC = 5V
SUPPLY VOLTAGE (V)
VCC = 5V
OUTPUT VOLTAGE (V)
VCC = 4.5V
RL = 3k VCC = 5V VCC = 4.5V
VCC = 5.5V OUTPUT LOW -10 -55 -25 0 25 50 75 100 TEMPERATURE (C)
4
UW
U
U
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(Pin numbers refer to LT1080)
voltages will not damage the device if moderately current limited. Shorting one output will affect output from the other. REC2 IN; REC1 IN (Pins 9, 14): Receiver Inputs. Accepts RS232 voltage levels (30V) and has 0.4V of hysteresis to provide noise immunity. Input impedance is nominally 5k. REC2 OUT; REC1 OUT (Pins 10, 13): Receiver Outputs with TTL/CMOS Voltage Levels. Outputs are in a high impedance state when in the SHUTDOWN mode to allow data line sharing. Outputs are fully short-circuit protected to ground or VCC with power on, off or in the SHUTDOWN mode. TR2 IN; TR1 IN (Pins 11, 12): RS232 Driver Input Pins. Inputs are TTL/CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. GND (Pin 16): Ground Pin. VCC (Pin 17): Input Supply Pin. Supply current drops to zero in the SHUTDOWN mode. ON/OFF (Pin 18): Contols the operation mode of the LT1080 and is TTL/CMOS compatible. A logic low puts the device in the SHUTDOWN mode which reduces input supply current to zero and places both driver and receiver outputs in a high impedance state. A logic high fully enables the device.
Supply Generator Outputs
V + OUTPUT VOLTAGE LOADED TO V - LOADED TO GROUND 10 8 6 4 2 0 -2 -4 -6 -8 -10
Supply Generation from VCC or Shutdown
V + SUPPLY VCC = 5V C1 TO C4 = 1F RL = 4.7k; V + TO V -
6
V - OUTPUT VOLTAGE 0 2 4 6 8 10 12 14 16 18 20 OUTPUT CURRENT (mA)
1080/81 G02
V - SUPPLY 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TIME (ms)
1080/81 G03
125
1080/81 G01
LT1080/LT1081 TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Input Thresholds
3.00 2.75 2.50
100
OUTPUT CURRENT (mA)
INPUT THRESHOLD (V)
INPUT CURRENT (A)
2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 -55 -25 0 25 50 75 TEMPERATURE (C) 100 125 INPUT LOW INPUT HIGH
ON/OFF Pin Thresholds
5.0 4.5
ON/OFF PIN VOLTAGE (V)
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -55 MAXIMUM OFF VOLTAGE MINIMUM ON VOLTAGE
OUTPUT LEAKAGE CURRENT (A)
SUPPLY CURRENT (nA)
-25
0 25 50 75 TEMPERATURE (C)
Output Waveforms
5V 0V -5V 5V 0V 5V 0V 0 VCC = 5V RL = 3k 2s 4s 6s 8s
1080/81 G10.tiff
DRIVER OUTPUT RECEIVER OUTPUT
INPUT
UW
100
Receiver Output Short-Circuit Current
40 35
OUTPUT SINKING 10
ON/OFF Pin Current vs Voltage
30 25 20 15 10 5 0 -5
OUTPUT SOURCING 1
0.1 -55
-10
-25 0 25 50 75 TEMPERATURE (C) 100 125
0
1
2 3 INPUT VOLTAGE (V)
4
5
1080/81 G06
1080/81 G04
1080/81 G05
Supply Current in Shutdown
1000 VCC = 5V 100
Driver Output Leakage in Shutdown
100
10
10
1
VOUT = 30V
VOUT = -30V
125
1 -55
-25
0 25 50 75 TEMPERATURE (C)
100
125
0.1 -55
-25
0 25 50 75 TEMPERATURE (C)
100
125
1080/81 G07
1080/81 G08
1080/81 G09
Shutdown to Driver Output
DRIVER 10V OUTPUT 5V HIGH 0V RECEIVER 0V OUTPUT -5V LOW -10 ON/OFF INPUT 5V 0V 0 VCC = 5V RL = 3k 1ms 2ms 3ms 4ms
1080/81 G11.tiff
Shutdown to Receiver Output
6V 4V 2V 0V 5V 0V 0 VCC = 5V 1ms 2ms 3ms 4ms
1080/81 G11.tiff
RECEIVER OUTPUT
ON/OFF INPUT
5
LT1080/LT1081
APPLICATIO S I FOR ATIO
The driver output stage of the LT1080 offers significantly improved protection over older bipolar and CMOS designs. In addition to current limiting, the driver output can be externally forced to 30V with no damage or excessive current flow, and will not disrupt the supplies. Some drivers have diodes connected between the outputs and the supplies, so externally applied voltages can cause excessive supply voltage to develop.
LT1080/LT1081 Driver
30V -30V OUTPUT CAN BE FORCED EXTERNALLY
1080/81 F01
Older RS232 Drivers and CMOS Drivers
V+ WITH SOME DRIVERS, EXTERNALLY APPLIED VOLTAGE CAN FORCE THE SUPPLIES V-
1080/81 F02
Sharing a Receiver Line
LT1080 #1 RECEIVER RS232 INPUT A LOGIC INPUT A
LT1080 #2 RECEIVER RS232 INPUT B LOGIC OUTPUT LOGIC INPUT B
ON/OFF (CHANNEL SELECT) INPUT
LOGIC INVERTER
1080/81 F04
6
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Placing the LT1080 in the SHUTDOWN mode (Pin 18 low) puts both the driver and receiver outputs in a high impedance state. This allows data line sharing and transceiver applications. The SHUTDOWN mode also drops input supply current (VCC; Pin 17) to zero for power-conscious systems.
Transceiver
LT1080 #1 DRIVER LOGIC TRANSMIT/RECEIVE LINE RS232 TRANSMIT/RECEIVE LINE LT1080 #2 RECEIVER ON/OFF (TRANSMIT/ RECEIVE) INPUT LOGIC INVERTER
1080/81 F03
W
U
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Sharing a Transmitter Line
LT1080 #1 DRIVER
LT1080 #2 DRIVER RS232 TRANSMISSION LINE
ON/OFF (CHANNEL SELECT) INPUT
LOGIC INVERTER
1080/81 F05
LT1080/LT1081
APPLICATIO S I FOR ATIO
When driving CMOS logic from a receiver that will be used in the SHUTDOWN mode and there is no other active receiver on the line, a 51k resistor can be placed from the logic input to VCC to force a definite logic level when the receiver output is in a high impedance state.
VCC LT1080 RECEIVER 51k* RS232 INPUT
CMOS LOGIC
LOGIC OUTPUT
ON/OFF INPUT * FORCES LOGIC INPUT STATE WHEN VON/OFF IS LOW
1080/81 F06
To protect against receiver input overloads in excess of 30V, a voltage clamp can be placed on the data line and still maintain RS232 compatibility.
RS232 INPUT 1k* RECEIVER
30V 30V
5k
LOGIC OUTPUT
* A PTC THERMISTOR WILL ALLOW CONTINUOUS OVERLOAD OF GREATER THAN 100V
1080/81 F067
TYPICAL APPLICATIO
12V INPUT*
1F
12 LOGIC INPUTS
11 13
LOGIC OUTPUTS 10 18
ON/OFF
* PIN 1 USED ON LT1081.
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The generated driver supplies (V + and V -) may be used to power external circuitry such as other RS232 drivers or op amps. They should be loaded with care, since excessive loading can cause the generated supply voltages to drop, causing the RS232 driver output voltages to fall below RS232 requirements. See the graph "Supply Generator Outputs" for a comparison of generated supply voltage versus supply current.
+
1F LT1080 3 V+ DRIVER V+ EXTERNAL OP AMP
W
U
U
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+ -
V-
16
GND
V- 7 1F
1080/81 F08
Operating with 5V and 12V
2 4 LT1080 5 6 15 7 1F RS232 OUTPUT -12V OUTPUT 17 3 5V INPUT
8 14 5k 9 5k 16
RS232 OUTPUT RS232 INPUT
RS232 INPUT
1080/81 * TA03
7
LT1080/LT1081
PACKAGE DESCRIPTIO
CORNER LEADS OPTION (4 PLCS)
0.023 - 0.045 (0.584 - 1.143) HALF LEAD OPTION 0.045 - 0.068 (1.143 - 1.727) FULL LEAD OPTION 0.300 BSC (0.762 BSC)
0.008 - 0.018 (0.203 - 0.457)
0 - 15
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
CORNER LEADS OPTION (4 PLCS)
0.023 - 0.045 (0.584 - 1.143) HALF LEAD OPTION 0.045 - 0.068 (1.143 - 1.727) FULL LEAD OPTION
0.300 BSC (0.762 BSC) 0.015 - 0.060 (0.380 - 1.520)
0.008 - 0.018 (0.203 - 0.457)
0 - 15
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
8
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Dimensions in inches (millimeters) unless otherwise noted. J Package 16-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
0.005 (0.127) MIN 0.840 (21.336) MAX 16 15 14 13 12 11 10 9
0.025 (0.635) RAD TYP 1 2 3 4 5 6 7 8
0.220 - 0.310 (5.588 - 7.874)
0.200 (5.080) MAX 0.015 - 0.060 (0.380 - 1.520)
0.125 (3.175) MIN
0.045 - 0.068 (1.143 - 1.727) 0.014 - 0.026 (0.360 - 0.660)
0.100 0.010 (2.540 0.254)
J16 1197
J Package 18-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
0.005 (0.127) MIN 0.960 (24.384) MAX 18 17 16 15 14 13 12 11 10
0.025 (0.635) RAD TYP 1 2 3 4 5 6 7 8 9
0.220 - 0.310 (5.590 - 7.870)
0.200 (5.080) MAX
0.125 (3.175) MIN
0.045 - 0.068 (1.143 - 1.727) 0.014 - 0.026 (0.360 - 0.660)
0.100 0.010 (2.540 0.254)
J18 1197
LT1080/LT1081
PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted. N Package 16-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770* (19.558) MAX 16 15 14 13 12 11 10 9
0.255 0.015* (6.477 0.381)
1 0.300 - 0.325 (7.620 - 8.255) 0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
2
3
4
5
6
7
8
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.100 0.010 (2.540 0.254) 0.018 0.003 (0.457 0.076)
N16 1197
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N Package 18-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.900* (22.860) MAX 18 17 16 15 14 13 12 11 10
0.255 0.015* (6.477 0.381)
1 0.300 - 0.325 (7.620 - 8.255) 0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
2
3
4
5
6
7
8
9
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
N18 1197
0.005 (0.127) MIN 0.100 0.010 (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
(
+0.035 0.325 -0.015 +0.889 8.255 -0.381
)
9
LT1080/LT1081
PACKAGE DESCRIPTIO
0.291 - 0.299** (7.391 - 7.595) 0.010 - 0.029 x 45 (0.254 - 0.737) 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 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
10
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Dimensions in inches (millimeters) unless otherwise noted.
SW Package 16-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.398 - 0.413* (10.109 - 10.490) 16 15 14 13 12 11 10 9
NOTE 1
0.394 - 0.419 (10.007 - 10.643)
1 0.093 - 0.104 (2.362 - 2.642)
2
3
4
5
6
7
8 0.037 - 0.045 (0.940 - 1.143)
0.050 (1.270) TYP
0.004 - 0.012 (0.102 - 0.305)
0.014 - 0.019 (0.356 - 0.482) TYP
S16 (WIDE) 0396
LT1080/LT1081
PACKAGE DESCRIPTIO
0.291 - 0.299** (7.391 - 7.595) 0.010 - 0.029 x 45 (0.254 - 0.737) 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 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
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.
U
Dimensions in inches (millimeters) unless otherwise noted.
SW Package 18-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.447 - 0.463* (11.354 - 11.760) 18 17 16 15 14 13 12 11 10
SEE NOTE
0.394 - 0.419 (10.007 - 10.643)
1 0.093 - 0.104 (2.362 - 2.642)
2
3
4
5
6
7
8
9 0.037 - 0.045 (0.940 - 1.143)
0.050 (1.270) TYP
0.004 - 0.012 (0.102 - 0.305)
0.014 - 0.019 (0.356 - 0.482) TYP
S18 (WIDE) 0396
11
LT1080/LT1081
TYPICAL APPLICATIO
SHUTDOWN
18
ON/OFF VCC LT1080
TTL INPUT
TTL INPUT
TTL OUTPUT 5k TTL OUTPUT *C1 1F 2 5k C1+
4 5
C1- C2 + C2 - GND 16 1F 1F V+ V- 3 7 1 9 V+ V- GND 10
1F
6
*IN APPLICATIONS WHERE A SEPARATE SECOND POSITIVE SUPPLY IS AVAILABLE (SUCH AS 5V AND 12V), THE 12V SUPPLY MAY BE CONNECTED TO PIN 2 AND C1 DELETED. THE POWER SUPPLY CIRCUITRY WILL THEN INVERT THE 12V SUPPLY. THE 5V SUPPLY IS STILL NEEDED TO POWER THE BIASING CIRCUITRY AND RECEIVERS.
RELATED PARTS
PART NUMBER LT1180A/LT1181A LT1780/LT1781 LT1381 LT1130A/LT1140A LTC1383 LTC1386 DESCRIPTION 5V Low Power 2DR/2TX RS232 Transceiver 5V Low Power 2DR/2TX RS232 Transceiver 5V Low Power 2DR/2TX RS232 Transceiver 5V RS232 Transceivers 5V Low Power 2DR/2RX RS232 Transceiver 3.3V Low Power EIA/TIA562 Transceiver COMMENTS 0.1F Capacitors, 10kV ESD 15kV ESD 16-Pin Narrow SO Package Up to 5DR/5RX Low Supply Current ICC = 220A Low Supply Current ICC = 200A
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
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Supporting an LT1039 (Triple Driver/Receiver)
5V 17 18 VCC ON/OFF LT1039 17 RS232 OUTPUT RS232 OUTPUT TTL INPUT RS232 OUTPUT RS232 OUTPUT TTL INPUT TTL INPUT RS232 INPUT TTL OUTPUT 30k RS232 INPUT TTL OUTPUT 30k TTL OUTPUT 30k RS232 INPUT RS232 INPUT RS232 OUTPUT RS232 INPUT
1080/81 * TA02
10801fd LT/TP 0400 2K REV D * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1991

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