LT1039ACN

LT1039A/LT1039A-16 Triple RS232 Driver/Receiver with Shutdown FEATURES s DESCRIPTIO s s s s s s s s s s s s s s 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 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. APPLICATIO S s s s RS232 Interface Terminals Modems TYPICAL APPLICATIO 12V BIAS* RS232 IN 50Ω** RS232 IN *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 1 2 3 V+ LT1039A VCC 18 17 16 5V ON/OFF LOGIC Driver Output Swing OUTPUT VOLTAGE REFERRED TO SUPPLIES (V) V+ – 0.4 – 0.8 –1.2 –1.6 – 2.0 30k RS232 OUT 4 5 30k 6 7 30k 8 9 V– GND 1039A TA01 15 14 LOGIC LOGIC 13 12 LOGIC LOGIC 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 TA02 11 10 LOGIC U 1039afa U U 1 LT1039A/LT1039A-16 ABSOLUTE MAXIMUM RATINGS 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 PACKAGE/ORDER INFORMATION ORDER PART NUMBER 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 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 LT1039ACN16 LT1039ACSW16 Consult Factory for Availability N PACKAGE 16-LEAD PDIP SW PACKAGE 16-LEAD PLASTIC SO TJMAX = 125°C, θJA = 90°C/ W, θJC = 50°C/ W (N) TJMAX = 125°C, θJA = 95°C/ W, θJC = 27°C/ W (SW) Consult LTC Marketing for parts specified with wider operating temperature ranges. The q denotes the 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 20 – 15 MIN TYP MAX UNITS Driver V + = 12V, V – = – 12V, VON/OFF = 2.5V (Note 2) q q q q ELECTRICAL CHARACTERISTICS Logic Input Voltage Levels Logic Input Current Output Short-Circuit Current 2 U U W WW U W (Note 1) 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 ORDER PART NUMBER LT1039ACN LT1039ACSW LT1039AIN LT1039AISW N PACKAGE 18-LEAD PDIP TJMAX = 125°C, θJA = 79°C/ W, θJC = 36°C/ W (N) TJMAX = 125°C, θJA = 90°C/ W, θJC = 26°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 V + – 2.0 V – + 1.5 2.0 V + – 1.3 V – + 1.0 1.4 1.4 1 5 30 – 30 0.8 20 20 V V V V µA µA mA mA 1039afa LT1039A/LT1039A-16 The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER Output Leakage Current Supply Leakage Current Slew Rate Supply Current Prop Delay (tPLH) (tPHL) Receiver VCC = 5V, VON/OFF = 2.5V (Note 2) Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current Supply Current Supply Leakage Current ON/OFF Pin Current Prop Delay (tPLH) (tPHL) 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. Output Low, IOUT = – 1.6mA Output High, IOUT = 160µA Sourcing Current, VOUT = VCC Sinking Current, VOUT = 0V Shutdown (Note 2), 0V ≤ VOUT ≤ VCC, VIN = 0V (Note 5) Shutdown (Note 3) 0V ≤ VON/OFF ≤ 5V Input Low Level (VOUT = High) Input High Level (VOUT = Low) q q q q q q q q q q q q ELECTRICAL CHARACTERISTICS CONDITIONS MIN q q TYP 10 1 MAX 200 100 30 5 1.2 1.2 UNITS µA µA V/µs mA µs µs V V V kΩ V V mA mA Shutdown (Notes 3, 4), VOUT = ±18V, VIN = 0V Shutdown (Note 3) RL = 3k, CL = 51pF to 2500pF VOUT = Low 4 15 1 0.6 0.8 0.5 0.1 1.3 1.7 0.4 30 0.4 4.8 – 30 25 1 2 1 2.8 1.0 0.5 3.5 – 10 15 10 5 100 80 600 600 µA mA µA µA ns ns – 15 200 300 Note 4: For TA ≥ 100°C leakage current is 350µA max. Note 5: Bias pin open on 18-pin version. TYPICAL PERFORMANCE CHARACTERISTICS Driver Output Short-Circuit Current 50 45 40 3.00 2.75 SINKING INPUT VOLTAGE (V) 35 30 25 20 15 10 5 2.25 2.00 1.75 1.50 1.25 1.00 0.75 ON/OFF PIN VOLTAGE (V) OUTPUT CURRENT (mA) SOURCING 0 –55 –25 50 25 0 75 TEMPERATURE (°C) UW 100 1039A G01 Receiver Input Thresholds 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 50 25 0 75 TEMPERATURE (°C) 100 125 ON/OFF Pin Thresholds 2.50 INPUT HIGH MINIMUM ON VOLTAGE INPUT LOW MINIMUM OFF VOLTAGE 125 0.50 –55 –25 0 –55 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1039A G02 1039A G03 1039afa 3 LT1039A/LT1039A-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 INPUT CURRENT (µA) 25 20 15 10 5 0 –5 –10 0 1 2 3 INPUT VOLTAGE (V) 4 5 1039A G07 Output Waveforms RECEIVER OUTPUT DRIVER OUTPUT 5V 0V 10V 0V 0V DRIVER OUTPUT – 5V – 10V V + = 12V V – = –12V VCC = 5V RL = 3k 2µs/DIV 1039A G09 –10V 5V INPUT 0V DRIVER OUTPUT CONNECTED TO RECEIVER INPUT 4 UW 100 1039A G04 Driver Output Leakage in Shutdown 1000 Receiver Output Short-Circuit Current 60 55 50 45 40 35 30 25 20 15 10 5 125 SINKING 10 VOUT – 30V SOURCING VOUT 30V 1 –55 –25 0 25 50 75 TEMPERATURE (°C) 100 125 0 –55 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1039A G05 1039A G06 Driver Output Swing vs Current 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 TA02 Shutdown to Driver Output 10V DRIVER OUTPUT 5V 0V OUTPUT LOW OUTPUT HIGH ON/OFF INPUT 5V 0V V + = 12V V – = –12V RL = 3k 2µs/DIV 1039A G10 1039afa LT1039A/LT1039A-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 2ms/DIV 1039A 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 LT1309A 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. 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 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 UW BIAS Pin Response Time BIAS INPUT 5V (THRU 25kΩ) 0V VCC = 5V 0.2µs/DIV 1039A G12 U U U 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. 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 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. VCC (Pin 18): 5V Power for Receivers. 1039afa 5 LT1039A/LT1039A-16 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. LT1039A Driver 30V LT1039A OUTPUT CAN BE FORCED EXTERNALLY – 30V 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+ WITH SOME DRIVERS, EXTERNALLY APPLIED VOLTAGE CAN FORCE THE SUPPLIES V– 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. Sharing a Transmitter Line LOGIC INPUT A LT1039A #1 DRIVER LOGIC INPUT B LT1039A #2 DRIVER RS232 TRANSMISSION LINE LOGIC INVERTER ON/OFF (CHANNEL SELECT) INPUT 1039A AI03 6 U W U U Sharing a Receiver Line RS232 INPUT A LT1039A #1 RECEIVER RS232 INPUT B LT1039A #2 RECEIVER LOGIC OUTPUT LOGIC INVERTER ON/OFF (CHANNEL SELECT) INPUT 1039A AI04 Transceiver LOGIC TRANSMIT/RECEIVE LINE LT1039A #1 DRIVER RS232 TRANSMIT/RECEIVE LINE 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. 1039afa LT1039A/LT1039A-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 LT1039A 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 1039A AI07 RECEIVER 30k LOGIC OUTPUT 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 INPUT 5.6k RECEIVER 30k LOGIC OUTPUT 1039A 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 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. RS232 Compatible Shutdown Control Line 25k 2 BIAS RS232 SHUTDOWN INPUT 3 ON/OFF 17 16 LT1039A 1039A AI10 1039afa 7 LT1039A/LT1039A-16 PACKAGE DESCRIPTION U J Package 18-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) 0.960 (24.384) MAX 18 17 16 15 14 13 12 11 10 0.005 (0.127) MIN 0.023 – 0.045 (0.584 – 1.143) HALF LEAD OPTION 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION 0.025 (0.635) RAD TYP 1 2 3 4 5 6 7 8 9 0.220 – 0.310 (5.590 – 7.870) 0.300 BSC (0.762 BSC) 0.015 – 0.060 (0.380 – 1.520) 0.200 (5.080) MAX 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 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 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 *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 ( +0.035 0.325 –0.015 ) 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 0.018 ± 0.003 (0.457 ± 0.076) 0.100 (2.54) BSC 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 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) 0.100 (2.54) BSC N18 1098 1039afa 9 LT1039A/LT1039A-16 PACKAGE DESCRIPTION U 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 NOTE 1 0.394 – 0.419 (10.007 – 10.643) 0.291 – 0.299** (7.391 – 7.595) 0.010 – 0.029 × 45° (0.254 – 0.737) 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° – 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) 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 0.014 – 0.019 (0.356 – 0.482) TYP S16 (WIDE) 1098 1039afa 10 LT1039A/LT1039A-16 PACKAGE DESCRIPTION 0.291 – 0.299** (7.391 – 7.595) 0.010 – 0.029 × 45° (0.254 – 0.737) 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 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 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 9 0.037 – 0.045 (0.940 – 1.143) 0° – 8° TYP 0.050 (1.270) BSC 0.004 – 0.012 (0.102 – 0.305) 0.014 – 0.019 (0.356 – 0.482) TYP S18 (WIDE) 1098 1039afa 11 LT1039A/LT1039A-16 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 TTL IN TTL OUT 30k TTL OUT + 0.1µF 2 4 C+ C– C+ C– GND 16 + 0.1µF 5 6 RELATED PARTS PART NUMBER LTC 485 LT1137A LT1180A/81A LTC1345 LTC1348 ® DESCRIPTION Low Power RS485 Transceiver 5V 3 Driver/5 Receiver RS232 Transceiver 5V 2 Driver/2 Receiver RS232 Transceiver V.35 Transceiver 3.3V 3 Driver/5 Receiver RS232 Transceiver 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 30k TTL OUT 30k TTL OUT RS232 IN RS232 IN 1 9 V+ V– GND 10 1039A TA03 V+ V– 3 7 30k + 0.1µF + 0.1µF COMMENTS Industry Standard ±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 1039afa LT/LCG 1101 1.5K REV A • PRINTED IN USA www.linear.com © LINEAR TECHNOLOGY CORPORATION 1997