LTC2873 - Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination

The LTC®2873 is a robust pin-configurable multiprotocol transceiver that supports RS232, RS485, and RS422 protocols while operating on a single 3V to 5.5V supply. The LTC2873 can be configured as a half-duplex RS485 transceiver or as an RS232 transceiver using the same two bus pins.

A pin-controlled integrated termination resistor allows for easy interface reconfiguration, eliminating external resistors and control relays. Loopback mode steers the driver inputs to the receiver outputs for diagnostic self-test. The RS485 receiver supports up to 256 nodes per bus, and features full failsafe operation for floating, shorted or terminated inputs.

An integrated DC/DC boost converter uses a tiny 2mm × 1.6mm inductor and one capacitor, eliminating the need for multiple supplies when driving RS232 levels.

  • One RS485 or One RS232 Transceiver
  • 3V to 5.5V Supply Voltage
  • Up to 20Mbps RS485
  • Slew-Controlled RS232 Operation:
  • Selectable 1Mbps or 250kbps
  • Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors
  • High ESD: ±26kV HBM
  • Logic Loopback Mode
  • 1.7V to 5.5V Logic Interface
  • Supports Up to 256 RS485 Nodes
  • RS485 Receiver Failsafe Eliminates UART Lockup
  • H-Grade Available (–40°C to 125°C)
  • Available in 24-Pin 4mm × 5mm QFN Package
Typical Application
LTC2873 Typical Application
LTC2873 Typical Application
  • Software Selectable RS232/RS485/RS422 Interface
  • Industrial Sensors and Actuators
  • Alarm Systems
  • Traffic Control and Monitoring
  • Highway Signs and Jumbo Displays
LTC2873 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2873CUFD#PBF4x5 QFN-24C$6.36$4.45
LTC2873CUFD#TRPBF4x5 QFN-24C$6.42$4.51
LTC2873HUFD#PBF4x5 QFN-24H$8.41$5.89
LTC2873HUFD#TRPBF4x5 QFN-24H$8.47$5.95
LTC2873IUFD#PBF4x5 QFN-24I$7.31$5.12
LTC2873IUFD#TRPBF4x5 QFN-24I$7.37$5.18
Demo Boards
Part NumberDescriptionPrice
DC2364ALTC2873 Demo Board | Single Bus RS232/RS485 Multiprotocol Transceiver with Integrated Termination (Shared I/O) (DC2026 optional)$25.00
Companion Boards
Part NumberDescriptionPrice
DC2026CLinduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform$75.00
Reliability Data
Product Selector Card
Press Release
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