Interface Multiprotocol Transceivers

LTC2870 - RS232/RS485 Multiprotocol Transceivers with Integrated Termination

LTC1387 - Single 5V RS232/RS485 Multiprotocol Transceiver

Features

  • Two RS232 Transceivers or One RS485 Transceiver
  • Operates from a Single 5V Supply
  • Guaranteed Receiver Output with Inputs Floating or Shorted to Ground
  • Logic Selectable Fast/Slow RS485 Driver Slew Rate
  • Low Supply Current: 7mA Typical
  • 5µA Supply Current in Shutdown
  • Self-Testing Capability in Loopback Mode
  • Separate Driver and Receiver Enable Controls
  • Driver Maintains High Impedance in Three-State,Shutdown or with Power Off
  • Receiver Inputs Can Withstand ±25V

Typical Application

LTC1387 Typical Application

Description

The LTC1387 is a low power reconfigurable CMOS bidirectional transceiver. It can be configured as an RS485 differential port or as two RS232 single-ended ports. An onboard charge pump uses four 0.1µF capacitors to generate boosted positive and negative supplies, allowing the RS232 drivers to meet ±5V output swing requirements with only a single 5V supply. A shutdown mode reduces the ICC supply current to 5µA.

The RS232 transceivers are in full compliance with RS232 specification. The RS485 transceiver is in full compliance with RS485 and RS422 specifications. The RS485 receiver assumes a known output state when the inputs are floating or shorted to ground. All interface drivers feature short-circuit and thermal shutdown protection. An enable pin allows RS485 driver outputs to be forced into high impedance which is maintained even when the outputs are forced beyond supply rails or the power is off. A loop back mode allows the driver outputs to be connected back to the receiver inputs for diagnostic self-test.

The LTC1387 is available in 20-pin plastic SSOP and SW packages.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC1387CG#PBF SSOP-20 G C 05-08-1640 (G20) Yes
LTC1387CG#TRPBF SSOP-20 G C 05-08-1640 (G20) Yes
LTC1387CSW#PBF SW-20 SW C 05-08-1620 (SW20) Yes
LTC1387CSW#TRPBF SW-20 SW C 05-08-1620 (SW20) Yes
LTC1387IG#PBF SSOP-20 G I 05-08-1640 (G20) Yes
LTC1387IG#TRPBF SSOP-20 G I 05-08-1640 (G20) Yes
LTC1387ISW#PBF SW-20 SW I 05-08-1620 (SW20) Yes
LTC1387ISW#TRPBF SW-20 SW I 05-08-1620 (SW20) Yes


Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC1387CG#PBF SSOP-20 C $6.10 $4.80 Yes
LTC1387CG#TRPBF SSOP-20 C $4.90 Yes
LTC1387CSW#PBF SW-20 C $5.65 $4.50 Yes
LTC1387CSW#TRPBF SW-20 C $4.60 Yes
LTC1387IG#PBF SSOP-20 I $7.00 $5.50 Yes
LTC1387IG#TRPBF SSOP-20 I $5.60 Yes
LTC1387ISW#PBF SW-20 I $6.50 $5.20 Yes
LTC1387ISW#TRPBF SW-20 I $5.30 Yes
Buy Now • Request Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Point-of-Sale Terminals
  • Software Selectable Multiprotocol Interface Ports
  • Low Power RS485/RS422/RS232/EIA562 Interface
  • Cable Repeaters
  • Level Translators

People Who Viewed This Product Also Viewed

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support