Multiprotocol transceiver shrinks RS485/RS232 designs

March 17, 2016 // By Graham Prophet
LTC2873 is an RS485/RS232 multiprotocol transceiver in a 20 mm² package. The LTC2873 integrates all the functions necessary to provide the most compact multiprotocol IC available. Supporting ±26 kV HBM ESD bus protection, the LTC2873 provides a robust software-selectable interface for 3V to 5.5V systems.

A simple logic interface, supporting voltages as low as 1.7V, enables reconfiguration of shared bus lines as either one RS232 single-ended transceiver or one half-duplex RS485 differential transceiver. An integrated DC/DC boost controller and pin-controlled RS485 integrated termination resistor eliminate the need for external circuitry.


The LTC2873 is offered in commercial, industrial and automotive versions, supporting operating temperature ranges from 0°C to 70°C, -40°C to 85°C and -40°C to 125°C, respectively. The LTC2873 is available in a RoHS compliant 24-pin 4 x 5 mm QFN package. Pricing starts at $4.45 (1,000)


Linear Technology;


Features: LTC2873


3V to 5.5V supply voltage range

One RS485 & one RS232 transceiver

20 Mbps RS485 & selectable 1 Mbps or 250 kbps RS232

Automatic selection of integrated RS485 (120Ω) & RS232 (5 kΩ) termination resistors

Logic loopback mode

High ESD: ±26 kV on line I/O; ±4 kV on all other pins

1.7V to 5.5V logic interface

Supports up to 256 RS485 nodes

Full failsafe RS485 receiver eliminates UART lockup

24-pin 4 x 5 mm QFN package