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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.

Features 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

Applications Software Selectable RS232/RS485/RS422 Interface Industrial Sensors and Actuators Alarm Systems Traffic Control and Monitoring Highway Signs and Jumbo Displays Packaging

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