The LTC2870/LTC2871 are robust pin-configurable multiprotocol transceivers, supporting RS232, RS485, and RS422 protocols, operating on a single 3V to 5.5V supply. The LTC2870 can be configured as two RS232 single-ended transceivers or one RS485 differential transceiver on shared I/O lines. The LTC2871 offers independent control of two RS232 transceivers and one RS485 transceiver, each on dedicated I/O lines. Pin-controlled integrated termination resistors allow for easy interface reconfiguration, eliminating external resistors and control relays. Half-duplex switches allow four-wire and two-wire RS485 configurations. Loopback mode steers the driver inputs to the receiver outputs for diagnostic self-test.The RS485 receivers support up to 256 nodes per bus, and feature 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 for driving RS232 levels. Applications * Flexible RS232/RS485/RS422 Interface * Software Selectable Multiprotocol Interface Ports * Point-of-Sale Terminals * Cable Repeaters * Protocol Translators * One RS485 and Two RS232 Transceivers * 3V to 5.5V Supply Voltage * 20Mbps RS485 and 500kbps RS232 * Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors * Half-/Full-Duplex RS485 Switching * High ESD: ±26kV (LTC2870), ±16kV (LTC2871) https://elecena.pl/product/1245593/rs232-rs485-multiprotocol-transceivers-with-integrated-termination 2010-12-17 https://elecena.pl/product/1245593/rs232-rs485-multiprotocol-transceivers-with-integrated-termination 2013-11-28 https://elecena.pl/product/1245593/rs232-rs485-multiprotocol-transceivers-with-integrated-termination 2025-01-20