The LTC2873 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. Applications * Software Selectable RS232/RS485/RS422 Interface * Industrial Sensors and Actuators * Alarm Systems * Traffic Control and Monitoring * Highway Signs and Jumbo Displays * 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 https://elecena.pl/product/5913803/single-bus-rs485-rs232-multiprotocol-transceiver-with-switchable-termination 2016-02-16 https://elecena.pl/product/5913803/single-bus-rs485-rs232-multiprotocol-transceiver-with-switchable-termination 2016-03-10 https://elecena.pl/product/5913803/single-bus-rs485-rs232-multiprotocol-transceiver-with-switchable-termination 2025-01-22