What this RS-485 transceiver does on the bus
The 70 mV of receiver hysteresis gives it clean noise rejection on long or heavily loaded bus segments — useful in building automation, elevator controllers, and industrial fieldbus nodes where the cable runs can exceed a hundred metres.
The logic inputs are 3.3V-tolerant, so it interfaces directly with a 3.3V UART on an MCU without level shifting. If your system uses a 5V bus controller, you will need external translation or a different transceiver variant.
Full-duplex wiring and the 14-SOIC footprint
Full-duplex operation requires two twisted pairs — one for transmit, one for receive — plus a common ground.