LT1039A/LT1039A-16 Triple RS232 Driver/Receiver with Shutdown U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ On-Chip ESD Protection: ±15kV Human Body Model ±15kV IEC-1000-4-2 Air Gap Test** ±8kV IEC-1000-4-2 Contact Test 125kBd Operation with 3kΩ/2500pF Load 250kBd Operation with 3kΩ/1000pF Load Outputs Can Be Driven ±30V Without Damage No Supply Current in Shutdown Operates from ±5V to ±15V Supplies Fully Protected Against Overload Three-State Outputs; Outputs Open When Off Bipolar Circuit—No Latchup ±30V Input Range Triple Driver/Receiver 30kΩ Input Impedance Meets All RS232 Specifications 16-Pin Version—Pin Compatible with MC145406 Available in SO Package U APPLICATIO S ■ ■ ■ The LT ®1039A 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. On-chip ESD protection eliminates the need for external protection devices. A bias pin allows one receiver to be kept on while the rest of the part is shut down. The LT1039A 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 LT1180A/LT1181A and LT1130A data sheets. , LTC and LT are registered trademarks of Linear Technology Corporation. RS232 Interface Terminals Modems U TYPICAL APPLICATIO BIAS* RS232 IN 1 V+ 2 LT1039A VCC 18 17 16 3 5V LOGIC 30k 50Ω** RS232 OUT RS232 IN 4 15 5 14 LOGIC LOGIC 30k *BIAS PIN USED 50Ω** TO KEEP THE RS232 OUT RECEIVER ON WHILE IN SHUTDOWN RS232 IN **50Ω RESISTORS MAY BE REQUIRED 50Ω** FOR IEC-1000-4-2 RS232 OUT ESD PROTECTION DEPENDING UPON – 12V PC BOARD AND CONNECTOR LEAD LENGTH 6 13 7 12 LOGIC LOGIC 30k 11 8 9 V– GND 10 Driver Output Swing ON/OFF LOGIC OUTPUT VOLTAGE REFERRED TO SUPPLIES (V) 12V V+ – 0.4 – 0.8 –1.2 –1.6 – 2.0 1.2 0.8 0.4 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) 1039A TA01 1039A TA02 1039afa 1 LT1039A/LT1039A-16 W W U W ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage Driver (V +, V –) ................................................. ±16V Receiver (VCC) ...................................................... 7V Logic Inputs .................................................. V – to 25V Receiver Inputs ..................................................... ±30V ON/OFF Input .............................................. GND to 12V Driver Outputs ............................. V – + 30V to V + – 30V Short-Circuit Duration ..................................... Indefinite Operating Temperature Range LT1039AC ............................................... 0°C to 70°C LT1039AI ........................................... – 40°C to 85°C LT1039AM (OBSOLETE) ............. – 55°C to 125°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C U W U PACKAGE/ORDER INFORMATION ORDER PART NUMBER TOP VIEW LT1039ACN16 LT1039ACSW16 V+ 1 16 VCC REC1 IN 2 15 REC1 OUT TR1 OUT 3 14 TR1 IN REC2 IN 4 13 REC2 OUT TR2 OUT 5 12 TR2 IN REC3 IN 6 11 REC3 OUT TR3 OUT 7 10 TR3 IN V– 8 9 N PACKAGE 16-LEAD PDIP Consult Factory for Availability GND SW PACKAGE 16-LEAD PLASTIC SO TOP VIEW ORDER PART NUMBER V+ 1 18 VCC BIAS 2 17 ON/OFF REC1 IN 3 16 REC1 OUT TR1 OUT 4 15 TR1 IN REC2 IN 5 14 REC2 OUT TR2 OUT 6 13 TR2 IN REC3 IN 7 12 REC3 OUT TR3 OUT 8 11 TR3 IN V– 9 10 GND N PACKAGE 18-LEAD PDIP LT1039ACN LT1039ACSW LT1039AIN LT1039AISW SW PACKAGE 18-LEAD PLASTIC SO TJMAX = 125°C, θJA = 79°C/ W, θJC = 36°C/ W (N) TJMAX = 125°C, θJA = 90°C/ W, θJC = 26°C/ W (SW) TJMAX = 125°C, θJA = 90°C/ W, θJC = 50°C/ W (N) TJMAX = 125°C, θJA = 95°C/ W, θJC = 27°C/ W (SW) J PACKAGE 18-LEAD CERDIP TJMAX = 150°C, θJA = 88°C/ W, θJC = 22°C/ W (J) LT1039AMJ OBSOLETE PACKAGE Consider the N Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Driver V + = 12V, V – = – 12V, VON/OFF = 2.5V (Note 2) Output Voltage Swing Logic Input Voltage Levels Load = 3k to Ground Positive Negative ● ● V + – 2.0 V – + 1.5 V + – 1.3 V – + 1.0 Input Low Level (VOUT = High) Input High Level (VOUT = Low) ● ● 1.4 1.4 0.8 2.0 V V 1 5 20 20 µA µA Logic Input Current VIN ≥ 2.0V VIN ≤ 0.8V Output Short-Circuit Current Sourcing Current, VOUT = 0V Sinking Current, VOUT = 0V 20 – 15 30 – 30 V V mA mA 1039afa 2 LT1039A/LT1039A-16 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN Output Leakage Current Shutdown (Notes 3, 4), VOUT = ±18V, VIN = 0V ● Supply Leakage Current Shutdown (Note 3) ● Slew Rate RL = 3k, CL = 51pF to 2500pF Supply Current VOUT = Low 4 Prop Delay (tPLH) (tPHL) TYP MAX UNITS 10 200 µA 1 100 µA 15 30 V/µs 1 5 mA 0.6 0.8 1.2 1.2 µs µs 1.3 1.7 2.8 V V 1.0 V Receiver VCC = 5V, VON/OFF = 2.5V (Note 2) Input Voltage Thresholds Input Low Level (VOUT = High) Input High Level (VOUT = Low) Hysteresis Input Resistance ● ● 0.5 ● 0.1 0.4 ● 30 Output Low, IOUT = – 1.6mA Output High, IOUT = 160µA ● ● 3.5 0.4 4.8 Output Short-Circuit Current Sourcing Current, VOUT = VCC Sinking Current, VOUT = 0V ● ● – 10 15 – 30 25 Output Leakage Current Shutdown (Note 2), 0V ≤ VOUT ≤ VCC, VIN = 0V ● 1 10 µA Supply Current (Note 5) ● 2 5 mA Supply Leakage Current Shutdown (Note 3) ● 1 100 µA ON/OFF Pin Current 0V ≤ VON/OFF ≤ 5V ● 80 µA 600 600 ns ns Output Voltage kΩ 0.5 mA mA – 15 Prop Delay (tPLH) (tPHL) 200 300 Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: VON/OFF = 5V for LT1039AM 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 LT1039A-16 part. V V Note 4: For TA ≥ 100°C leakage current is 350µA max. Note 5: Bias pin open on 18-pin version. U W TYPICAL PERFORMANCE CHARACTERISTICS Receiver Input Thresholds ON/OFF Pin Thresholds 5.0 45 2.75 4.5 40 2.50 4.0 35 SINKING 30 25 SOURCING 20 15 2.25 ON/OFF PIN VOLTAGE (V) 3.00 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) Driver Output Short-Circuit Current 50 INPUT HIGH 2.00 1.75 1.50 1.25 INPUT LOW 3.5 3.0 2.5 2.0 10 1.00 1.0 5 0.75 0.5 0 –55 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1039A G01 0.50 –55 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1039A G02 MINIMUM ON VOLTAGE 1.5 MINIMUM OFF VOLTAGE 0 –55 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1039A G03 1039afa 3 LT1039A/LT1039A-16 U W TYPICAL PERFORMANCE CHARACTERISTICS Driver Output Leakage in Shutdown Supply Current in Shutdown 1000 60 1000 SUPPLY CURRENT MEASURED INTO VCC AND V + 55 100 10 1 –55 –25 0 25 50 75 TEMPERATURE (°C) 100 50 OUTPUT CURRENT (mA) OUTPUT LEAKAGE CURRENT (µA) SUPPLY CURRENT (nA) Receiver Output Short-Circuit Current 100 VOUT – 30V 10 125 0 25 50 75 TEMPERATURE (°C) 100 1039A G04 ON/OFF Pin Current vs Voltage OUTPUT VOLTAGE REFERRED TO SUPPLIES (V) INPUT CURRENT (µA) 30 25 20 15 10 5 0 –5 1 2 3 INPUT VOLTAGE (V) 35 30 25 20 15 5 125 0 –55 –25 4 100 125 V+ – 0.4 – 0.8 –1.2 –1.6 – 2.0 1.2 0.8 0.4 V– 5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT CURRENT (mA) 1039A TA02 Output Waveforms DRIVER OUTPUT 50 25 0 75 TEMPERATURE (°C) 1039A G06 1039A G07 RECEIVER OUTPUT SOURCING Driver Output Swing vs Current 35 0 40 1039A G05 40 –10 SINKING 10 VOUT 30V 1 –55 –25 45 Shutdown to Driver Output 10V 5V 0V 10V DRIVER OUTPUT OUTPUT HIGH 5V 0V 0V 0V –10V 5V INPUT 0V DRIVER OUTPUT OUTPUT LOW – 5V – 10V V + = 12V V – = –12V VCC = 5V RL = 3k 2µs/DIV 1039A G09 ON/OFF INPUT 5V 0V V + = 12V V – = –12V RL = 3k 2µs/DIV 1039A G10 DRIVER OUTPUT CONNECTED TO RECEIVER INPUT 1039afa 4 LT1039A/LT1039A-16 U W TYPICAL PERFORMANCE CHARACTERISTICS Shutdown to Receiver Output BIAS Pin Response Time 6V 6V RECEIVER 4V OUTPUT 2V RECEIVER 1 4V OUTPUT 2V 0V 0V ON/OFF 5V INPUT 0V BIAS INPUT 5V (THRU 25kΩ) 0V VCC = 5V U U U PIN FUNCTIONS 2ms/DIV 1039A G11 VCC = 5V 0.2µs/DIV 1039A G12 (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 LT1309A is in the shutdown mode. Leave BIAS pin open when not in use. See Applications Information for proper use. output pins are internally protected from ESD transients. In order to insure proper functioning of the ESD protection devices, the V + and V – supply pins must be bypassed with low ESR capacitors located close to the pins. 0.1µF ceramic capacitors work well. GND (Pin 10): Ground Pin. 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. Receiver input pins are internally protected from ESD transients. In order to insure proper functioning of the ESD protection devices, the VCC and V – supply pins must be bypassed with low ESR capacitors located close to the pins. A 0.1µF ceramic capacitor works well. 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. 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. Driver ON/OFF (Pin 17): Controls the operation mode of the LT1039A 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. 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. VCC (Pin 18): 5V Power for Receivers. 1039afa 5 LT1039A/LT1039A-16 U U W U APPLICATIONS INFORMATION The driver output stage of the LT1039A 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. Sharing a Receiver Line RS232 INPUT A LT1039A #1 RECEIVER RS232 INPUT B LT1039A #2 RECEIVER LT1039A Driver 30V LOGIC OUTPUT LT1039A OUTPUT CAN BE FORCED EXTERNALLY – 30V LOGIC INVERTER 1039A AI01 The driver outputs utilize high impedance overvoltage protection, eliminating the flow of fault currents into supplies, as will happen with conventional diode clamp configurations. Older RS232 Drivers and Other CMOS Drivers V+ ON/OFF (CHANNEL SELECT) INPUT Transceiver LOGIC TRANSMIT/RECEIVE LINE WITH SOME DRIVERS, EXTERNALLY APPLIED VOLTAGE CAN FORCE THE SUPPLIES V– LOGIC INPUT B LT1039A #2 DRIVER LT1039A #2 RECEIVER LOGIC INVERTER ON/OFF (TRANSMIT/RECEIVE) INPUT 1039A AI05 The shutdown mode also drops all supply currents (VCC, V +, V –) to zero for power conscious systems. Sharing a Transmitter Line LT1039A #1 DRIVER RS232 TRANSMIT/RECEIVE LINE LT1039A #1 DRIVER 1039A AI02 Placing the LT1039A 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. LOGIC INPUT A 1039A AI04 RS232 TRANSMISSION LINE LOGIC INVERTER ON/OFF (CHANNEL SELECT) INPUT 1039A AI03 1039afa 6 LT1039A/LT1039A-16 U U W U 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 RS232 INPUT CMOS LOGIC LT1039A RECEIVER Input Overvoltage Protection RECEIVER 1k 30k 30V 5.6k 25k 2 BIAS 1039A AI06 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 LOGIC SHUTDOWN INPUT LOGIC OUTPUT *FORCES LOGIC INPUT STATE WHEN VON/OFF IS LOW ON/OFF INPUT 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 VCC 51k* Driver inputs should not be allowed to float. Any unused inputs should be tied to VCC. LOGIC OUTPUT RS232 INPUT ON/OFF 3 17 16 LOGIC OUTPUT LT1039A 1039A 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. 30V 1039A AI07 The receiver input impedance of the LT1039A 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 Compatible Shutdown Control Line 25k 2 BIAS RS232 SHUTDOWN INPUT ON/OFF 3 17 16 LT1039A 1039A AI10 RECEIVER RS232 INPUT 30k 5.6k LOGIC OUTPUT 1039A AI08 1039afa 7 LT1039A/LT1039A-16 U PACKAGE DESCRIPTION J Package 18-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) 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 0.005 (0.127) MIN 0.960 (24.384) MAX 18 17 16 15 14 13 12 11 10 0.220 – 0.310 (5.590 – 7.870) 0.025 (0.635) RAD TYP 1 2 3 4 5 6 7 8 9 0.200 (5.080) MAX 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 0.125 (3.175) MIN 0.045 – 0.065 (1.143 – 1.651) 0.014 – 0.026 (0.360 – 0.660) 0.100 (2.54) BSC J18 1298 OBSOLETE PACKAGE 1039afa 8 LT1039A/LT1039A-16 U PACKAGE DESCRIPTION N Package 16-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.770* (19.558) MAX 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 0.255 ± 0.015* (6.477 ± 0.381) 0.130 ± 0.005 (3.302 ± 0.127) 0.300 – 0.325 (7.620 – 8.255) 0.020 (0.508) MIN 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 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) 0.100 (2.54) BSC *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) N16 1098 N Package 18-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.900* (22.860) MAX 18 17 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 9 0.255 ± 0.015* (6.477 ± 0.381) 0.130 ± 0.005 (3.302 ± 0.127) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 ) 0.020 (0.508) MIN 0.065 (1.651) TYP 0.125 (3.175) MIN 0.005 (0.127) MIN *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 8.255 +0.889 –0.381 0.045 – 0.065 (1.143 – 1.651) 0.100 (2.54) BSC 0.018 ± 0.003 (0.457 ± 0.076) N18 1098 1039afa 9 LT1039A/LT1039A-16 U PACKAGE DESCRIPTION SW Package 16-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) 0.398 – 0.413* (10.109 – 10.490) 16 15 14 13 12 11 10 9 0.394 – 0.419 (10.007 – 10.643) NOTE 1 1 0.291 – 0.299** (7.391 – 7.595) 2 3 4 5 6 7 0.093 – 0.104 (2.362 – 2.642) 0.010 – 0.029 × 45° (0.254 – 0.737) 8 0.037 – 0.045 (0.940 – 1.143) 0° – 8° TYP 0.009 – 0.013 (0.229 – 0.330) NOTE 1 0.016 – 0.050 (0.406 – 1.270) 0.050 (1.270) BSC 0.004 – 0.012 (0.102 – 0.305) 0.014 – 0.019 (0.356 – 0.482) TYP 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 S16 (WIDE) 1098 *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 1039afa 10 LT1039A/LT1039A-16 U PACKAGE DESCRIPTION SW Package 18-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) 0.447 – 0.463* (11.354 – 11.760) 18 17 16 15 14 13 12 11 10 0.394 – 0.419 (10.007 – 10.643) NOTE 1 0.291 – 0.299** (7.391 – 7.595) 1 2 3 4 5 6 7 8 9 0.093 – 0.104 (2.362 – 2.642) 0.010 – 0.029 × 45° (0.254 – 0.737) 0.037 – 0.045 (0.940 – 1.143) 0° – 8° TYP 0.009 – 0.013 (0.229 – 0.330) NOTE 1 0.016 – 0.050 (0.406 – 1.270) 0.050 (1.270) BSC 0.004 – 0.012 (0.102 – 0.305) 0.014 – 0.019 (0.356 – 0.482) TYP 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 S18 (WIDE) 1098 *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 1039afa 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. 11 LT1039A/LT1039A-16 U TYPICAL APPLICATION LT1180A (Driver/Receiver with Power Supply) Driving an LT1039A SHUTDOWN 5V 18 ON/OFF VCC LT1039A 17 18 VCC ON/OFF LT1039A 17 TTL IN RS232 OUT TTL IN RS232 OUT TTL IN RS232 OUT TTL IN RS232 OUT TTL IN RS232 OUT TTL OUT RS232 IN TTL OUT RS232 IN 30k 30k TTL OUT + 0.1µF + 0.1µF RS232 IN 2 C+ 4 C– 5 C+ 6 TTL OUT RS232 IN 30k 30k TTL OUT C– V+ 3 V– 7 GND 16 + RS232 IN 1 V+ 9 V– + 0.1µF 30k GND 0.1µF 10 1039A TA03 RELATED PARTS PART NUMBER ® DESCRIPTION COMMENTS LTC 485 Low Power RS485 Transceiver Industry Standard LT1137A 5V 3 Driver/5 Receiver RS232 Transceiver ±15kV ESD Protection LT1180A/81A 5V 2 Driver/2 Receiver RS232 Transceiver Industry Standard, 0.1µF Capacitors LTC1345 V.35 Transceiver Single 5V Supply Using 0.1µF Capacitors LTC1348 3.3V 3 Driver/5 Receiver RS232 Transceiver Operates from 3.3V to 5V Supplies, 5 Receivers Active in Shutdown 1039afa 12 Linear Technology Corporation LT/LCG 1101 1.5K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 1997