LT1039CSW

LT1039/LT1039-16 RS232 Driver/Receiver with Shutdown FEATURES s s s s s s s s s s s s s DESCRIPTIO Operates from ± 5V to ±15V Supplies Fully Protected Against Overload Outputs Can Be Driven ± 30V Without Damage Three-State Outputs; Outputs Open When Off Bipolar Circuit—No Latchup ± 30V Input Range Triple Driver/Receiver No Supply Current in Shutdown 30kΩ Input Impedance Meets All RS232 Specifications 16-Pin Version—Pin Compatible with MC145406 Available in SO Package 15kV ESD: LT1039A The LT ®1039 is a triple RS232 driver/receiver that includes shutdown. Each receiver will accept up to ± 30V input and can drive either TTL or CMOS logic. The RS232 drivers accept TTL logic inputs and output RS232 voltage levels. The outputs are fully protected against overload and can be shorted to ground or up to ± 30V without damage to the drivers. Additionally, when the system is shut down or power is off, the outputs are in a high impedance state allowing data line sharing. Bipolar circuitry makes this driver/receiver exceptionally rugged against overloads and immune to latchup. A BIAS pin allows one receiver to be kept on while the rest of the part is shut down. The LT1039 is also available in the 16-pin version, without shutdown or BIAS pin functions. For applications requiring operation from a single 5V supply, see the LT1080/LT1081, LT1180A/LT1181A and LT1130A data sheets. For applications requiring 15kV ESD, see the LT1039A. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S s s s RS232 Interface Terminals Modems TYPICAL APPLICATIO 12V BIAS* RS232 IN 1 2 3 V+ LT1039 VCC 18 17 16 5V ON/OFF LOGIC V+ POSITIVE – 0.5 OUTPUT VOLTAGE (V) 30k RS232 OUT RS232 IN 4 5 30k RS232 OUT RS232 IN 6 7 30k *BIAS PIN USED RS232 OUT TO KEEP THE RECEIVER ON – 12V WHILE IN SHUTDOWN 8 9 V– GND 1039 TA01 15 14 LOGIC LOGIC 1.5 NEGATIVE 1.0 13 12 LOGIC LOGIC 0.5 11 10 LOGIC V– 0 2 U Driver Output Swing 6 8 4 OUTPUT CURRENT (mA) 10 1039 TA02 U U 1039fd 1 LT1039/LT1039-16 ABSOLUTE MAXIMUM RATINGS Supply Voltage Driver (V +, V –) .................................................. ±16V Receiver (VCC) ....................................................... 7V Logic Inputs ................................................... V – to 25V Receiver Inputs ........................................................ ±30 ON/OFF Input ............................................... GND to 12V Driver Outputs ........................ (V – + 30V) to (V + – 30V) PACKAGE/ORDER INFORMATION TOP VIEW V+ REC1 IN TR1 OUT REC2 IN TR2 OUT REC3 IN TR3 OUT V– 1 2 3 4 5 6 7 8 16 VCC 15 REC1 OUT 14 TR1 IN 13 REC2 OUT 12 TR2 IN 11 REC3 OUT 10 TR3 IN 9 GND ORDER PART NUMBER LT1039CN16 LT1039CSW16 CONSULT FACTORY FOR AVAILABILITY N PACKAGE 16-LEAD PDIP SW PACKAGE 16-LEAD PLASTIC SO WIDE TJMAX = 150°C, θJA = 140°C/ W (N) TJMAX = 150°C, θJA = 150°C/ W (SW) J PACKAGE 16-LEAD CERDIP TJMAX = 150°C, θJA = 100°C/ W (J) LT1039MJ16 OBSOLETE PACKAGES Consider the N Package for Alternate Source The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER Output Voltage Swing CONDITIONS Load = 3k to Ground Positive Negative Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN ≥ 2.0V VIN ≤ 0.8V Sourcing Current, VOUT = 0V Sinking Current, VOUT = 0V Shutdown (Notes 3, 4), VOUT = ±18V, VIN = 0V Shutdown (Note 3) RL = 3k, CL = 51pF VOUT = Low q q ELECTRICAL CHARACTERISTICS Driver V + = 12V, V – = – 12V, VON/OFF = 2.5V (Note 2) q q q q Logic Input Voltage Levels Logic Input Current Output Short-Circuit Current Output Leakage Current Supply Leakage Current Slew Rate Supply Current 2 U U W WW U W (Note 1) Short-Circuit Duration ..................................... Indefinite Operating Temperature Range LT1039C .................................................. 0°C to 70°C LT1039I ...............................................–40°C to 85°C LT1039M ...........................................–55°C to 125°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C TOP VIEW V+ BIAS REC1 IN TR1 OUT REC2 IN TR2 OUT REC3 IN TR3 OUT V– 1 2 3 4 5 6 7 8 9 18 VCC 17 ON/OFF 16 REC1 OUT 15 TR1 IN 14 REC2 OUT 13 TR2 IN 12 REC3 OUT 11 TR3 IN 10 GND SW PACKAGE 18-LEAD PLASTIC SO WIDE ORDER PART NUMBER LT1039CN LT1039CSW LT1039IN LT1039ISW N PACKAGE 18-LEAD PDIP TJMAX = 150°C, θJA = 120°C/ W(N) TJMAX = 150°C, θJA = 120°C/ W(SW) J PACKAGE 18-LEAD CERDIP TJMAX = 150°C, θJA = 100°C/ W(J) LT1039CJ LT1039MJ MIN TYP MAX UNITS V + – 0.4 V – + 1.5 2.0 V + – 0.1 V – + 1.0 1.4 1.4 1 5 0.8 20 20 V V V V µA µA mA mA 200 100 30 8 µA µA V/µs mA 1039fd 5 –5 15 – 15 10 (25°C) 1 (25°C) 4 15 4 LT1039/LT1039-16 The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current Supply Current Supply Leakage Current ON/OFF Pin Current Shutdown (Note 3) 0V ≤ VON/OFF ≤ 5V Output Low, IOUT = – 1.6mA Output High, IOUT = 160µA Sourcing Current, VOUT = 0V (Note 5) Sinking Current, VOUT = VCC Shutdown (Note 2), 0V ≤ VOUT ≤ VCC, VIN = 0V CONDITIONS Input Low Level (VOUT = High) Input High Level (VOUT = Low) q q q q q q q q q q q q ELECTRICAL CHARACTERISTICS MIN 0.5 0.1 TYP 1.3 1.7 0.4 30 0.4 4.8 1 1 4 1 (25°C) MAX UNITS V V V kΩ V V mA mA Receiver VCC = 5V, VON/OFF = 2.5V (Note 2) 2.8 1.0 0.5 3.5 0.5 –10 10 7 100 80 µA mA µA µA – 15 Note 1: Absolute Maximum Ratings are those values beyond which the life of a device by be impaired. Note 2: VON/OFF = 5V for LT1039M grade devices. Note 3: VON/OFF = 0.4V for – 55°C ≤ TA ≤ 100°C and VON/OFF = 0.2V for 100°C ≤ TA ≤ 125°C. Does not apply to LT1039-16 part. Note 4: For TA ≥ 100°C, leakage current is 350µA max. Note 5: For TA ≤ – 25°C, output source current is 0.4mA. TYPICAL PERFORMANCE CHARACTERISTICS Driver Output Short-Circuit Current 50 45 40 OUTPUT CURRENT (mA) INPUT VOLTAGE (V) 35 30 25 20 15 10 5 0 –55 –25 50 25 0 75 TEMPERATURE (°C) 100 125 SOURCING SINKING 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 –55 –25 50 25 0 75 TEMPERATURE (°C) 100 125 INPUT LOW INPUT HIGH ON/OFF PIN VOLTAGE (V) UW 1039 G01 Receiver Input Thresholds 3.00 2.75 2.50 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 ON/OFF Pin Thresholds MINIMUM ON VOLTAGE MINIMUM OFF VOLTAGE 0 –55 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1039 G02 1039 G03 1039fd 3 LT1039/LT1039-16 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current in Shutdown 1000 SUPPLY CURRENT MEASURED INTO VCC AND V + SUPPLY CURRENT (nA) OUTPUT LEAKAGE CURRENT (µA) 100 100 OUTPUT CURRENT (mA) 10 1 –55 –25 0 25 50 75 TEMPERATURE (°C) ON/OFF Pin Current vs Voltage OUTPUT VOLTAGE REFERRED TO SUPPLIES (V) 40 35 30 V+ – 0.2 – 0.4 INPUT CURRENT (µA) 25 20 15 10 5 0 –5 –10 0 1 2 3 INPUT VOLTAGE (V) 4 5 1039 G07 Output Waveforms RECEIVER OUTPUT 5V 0V 10V 0V DRIVER OUTPUT – 10V 5V INPUT 0V V + = 12V V – = –12V VCC = 5V RL = 3k 2µs/DIV 1039 G09 DRIVER OUTPUT CONNECTED TO RECEIVER INPUT 4 UW 100 1039 G04 Driver Output Leakage in Shutdown 1000 100 Receiver Output Short-Circuit Current OUTPUT SINKING 10 10 VOUT – 30V OUTPUT SOURCING 1 VOUT 30V 1 –55 –25 0 25 50 75 TEMPERATURE (°C) 100 125 0.1 –55 –25 0 25 50 75 TEMPERATURE (°C) 100 125 125 1039 G05 1039 G06 Driver Output Swing vs Current OUTPUT HIGH 1.2 1.0 0.8 0.6 0.4 0.2 V– 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT CURRENT (mA) 1039 G08 OUTPUT LOW Shutdown to Driver Output 10V DRIVER OUTPUT 5V 0V 0V DRIVER OUTPUT ON/OFF INPUT – 5V – 10V 5V 0V V + = 12V V – = –12V RL = 3k 1ms/DIV 1039 G10 OUTPUT HIGH OUTPUT LOW 1039fd LT1039/LT1039-16 TYPICAL PERFORMANCE CHARACTERISTICS Shutdown to Receiver Output 6V RECEIVER 4V OUTPUT 2V 0V 6V RECEIVER 1 4V OUTPUT 2V 0V ON/OFF 5V INPUT 0V VCC = 5V 1ms/DIV 1039 G11 PIN FUNCTIONS (Pin numbers listed are for 18-pin device) V +, V – (Pins 1, 9): Driver Supply Pins. Supply current drops to zero in shutdown mode. Driver outputs are in a high impedance state when V + and V – = 0V. BIAS (Pin 2): Keeps receiver 1 on while the LT1039 is in the shutdown mode. Leave BIAS pin open when not in use. See Applications Information for proper use. REC IN (Pins 3, 5, 7): Receiver Input Pins. Accepts RS232 voltage levels (± 30V) and has 0.4V of hysteresis to provide noise immunity. Input impedance is nominally 30kΩ. TR OUT (Pins 4, 6, 8): Driver Outputs with RS232 Voltage Levels. Outputs are in a high impedance state when in the shutdown mode or when power is off (V + and V – = 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 voltages will not damage the device if moderately current limited. UW BIAS Pin Response Time BIAS INPUT 5V (THRU 25kΩ) 0V VCC = 5V 0.2µs/DIV 1039 G12 U U U GND (Pin 10): Ground Pin. TR IN (Pins 11, 13, 15): RS232 Driver Input Pins. Inputs are TTL/CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. REC OUT (Pins 12, 14, 16): 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. ON/OFF (Pin 17): Controls the operation mode of the LT1039 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. VCC (Pin 18): 5V Power for Receivers. 1039fd 5 LT1039/LT1039-16 APPLICATIONS INFORMATION The driver output stage of the LT1039 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. LT1039 Driver 30V LT1039 OUTPUT CAN BE FORCED EXTERNALLY – 30V 1039 AI01 Some drivers have diodes connected between the outputs and the supplies, so externally applied voltages can cause excessive supply voltage to develop Older RS232 Drivers and Other CMOS Drivers V+ WITH SOME DRIVERS, EXTERNALLY APPLIED VOLTAGE CAN FORCE THE SUPPLIES V– 1039 AI02 Placing the LT1039 in the shutdown mode (Pin 17 low) puts both the driver and receiver outputs in a high impedance state. This allows data line sharing and transceiver applications. Sharing a Transmitter Line LOGIC INPUT A LT1039 #1 DRIVER LOGIC INPUT B LT1039 #2 DRIVER RS232 TRANSMISSION LINE LOGIC INVERTER ON/OFF (CHANNEL SELECT) INPUT 1039 AI03 6 U W U U Sharing a Receiver Line RS232 INPUT A LT1039 #1 RECEIVER RS232 INPUT B LT1039 #2 RECEIVER LOGIC OUTPUT LOGIC INVERTER ON/OFF (CHANNEL SELECT) INPUT 1039 AI04 Transceiver LOGIC TRANSMIT/RECEIVE LINE LT1039 #1 DRIVER RS232 TRANSMIT/RECEIVE LINE LT1039 #2 RECEIVER LOGIC INVERTER ON/OFF (TRANSMIT/RECEIVE) INPUT 1039 AI05 The shutdown mode also drops all supply currents (VCC, V +, V –) to zero for power conscious systems. 1039fd LT1039/LT1039-16 APPLICATIONS INFORMATION 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. Driving CMOS Logic from a Receiver VCC CMOS LOGIC 51k* RS232 INPUT LT1039 RECEIVER LOGIC OUTPUT ON/OFF INPUT *FORCES LOGIC INPUT STATE WHEN VON/OFF IS LOW 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. Input Overvoltage Protection RS232 INPUT 1k 30V 5.6k 30V 1039 AI07 RECEIVER 30k LOGIC OUTPUT The receiver input impedance of the LT1039 is nominally 30kΩ. For applications requiring a 5kΩ input impedance, a 5.6k resistor can be connected from the receiver input to ground. 5kΩ Impedance Matching RS232 INPUT 5.6k RECEIVER 30k LOGIC OUTPUT 1039 AI08 U W U U Driver inputs should not be allowed to float. Any unused inputs should be tied to VCC. The BIAS pin is used to “keep alive” one receiver while in the shutdown mode (all other circuitry being inactive). This allows a system to be in shutdown and still have one active receiver for transferring data. Keeping Alive One Receiver While in Shutdown LOGIC SHUTDOWN INPUT 25k 1039A AI06 2 BIAS RS232 INPUT 3 ON/OFF 17 16 LOGIC OUTPUT LT1039 1039 AI09 It can also be used to make an RS232 compatible shutdown control line. Driving the BIAS pin low through a resistance of 24k to 30k keeps the receiver active. Do not drive the BIAS pin directly from a logic output without the series resistor. An unused BIAS pin should be left open. RS232 Compatible Shutdown Control Line 25k 2 BIAS RS232 SHUTDOWN INPUT 3 ON/OFF 17 16 LT1039 1039A AI10 1039fd 7 LT1039/LT1039-16 PACKAGE DESCRIPTION J Package 16-Lead CERDIP (Narrow 0.300, Hermetic) (LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) 0.005 (0.127) MIN 0.840 (21.336) MAX 16 15 14 13 12 11 10 9 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 U 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 OBSOLETE PACKAGES 1039fd LT1039/LT1039-16 PACKAGE DESCRIPTION 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 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( +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) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) 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 ) U 0.255 ± 0.015* (6.477 ± 0.381) 1 2 3 4 5 6 7 8 0.130 ± 0.005 (3.302 ± 0.127) 0.020 (0.508) MIN 0.045 – 0.065 (1.143 – 1.651) 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 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 0.130 ± 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) 0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 ± 0.003 (0.457 ± 0.076) N18 1197 1039fd 9 LT1039/LT1039-16 PACKAGE DESCRIPTION SW Package 16-Lead Plastic Small Outline (Wide 0.300) (LTC DWG # 05-08-1620) 0.291 – 0.299** (7.391 – 7.595) 0.010 – 0.029 × 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 U 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 2 3 4 5 6 7 8 0.093 – 0.104 (2.362 – 2.642) 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 1039fd LT1039/LT1039-16 PACKAGE DESCRIPTION SW Package 18-Lead Plastic Small Outline (Wide 0.300) (LTC DWG # 05-08-1620) 0.291 – 0.299** (7.391 – 7.595) 0.010 – 0.029 × 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 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 1039fd 11 LT1039/LT1039-16 TYPICAL APPLICATION LT1080 (Driver/Receiver with Power Supply) Driving an LT1039 SHUTDOWN 5V 18 ON/OFF VCC LT1080 17 18 VCC ON/OFF LT1039 17 TTL IN TTL IN TTL OUT 5k TTL OUT 5k 2 1µF 4 5 1µF 6 C1+ C1– C2+ C2– GND 16 V+ V– 3 7 RELATED PARTS PART NUMBER LTC 485 LT1039A/LT1039A-16 LT1137A LT1180A/LT1181A LTC1345 LTC1348 LT1780/LT1781 LT1785/LT1791 ® DESCRIPTION Low Power RS485 Transceiver Triple RS232 Driver/Receivers with Shutdown 5V 3-Driver/5-Receiver RS232 Transceiver 5V 2-Driver/2-Receiver RS232 Transceivers V.35 Transceiver 3.3V 3-Driver/5-Receiver RS232 Transceiver 5V 2-Driver/2-Receiver RS232 Transceivers Half Duplex/Full Duplex RS485 Transceivers 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q U RS232 OUT RS232 OUT TTL IN TTL IN TTL IN RS232 OUT RS232 OUT RS232 OUT RS232 IN 30k RS232 IN TTL OUT RS232 IN TTL OUT 30k TTLOUT 1 9 1µF 1µF V+ V– GND 10 1039 TA03 RS232 IN RS232 IN 30k COMMENTS Industry Standard ± 15kV ESD Protection ± 15kV ESD Protection Industry Standard, 0.1µF Capacitors Single 5V Supply Using 0.1µF Capacitors Operates from 3.3V to 5V Supplies, 5 Receivers Active in Shutdown ±15kV ESD Protection, 0.1µF Capacitors ±60V Protected with ±15kV ESD Protection 1039fd LT/TP 1102 1K REV D • PRINTED IN USA www.linear.com © LINEAR TECHNOLOGY CORPORATION 1991