It handles one driver and one receiver on a single differential bus, with data rates up to 20 Mbps. The 80 mV of receiver hysteresis gives it solid noise margin on long cable runs or in electrically noisy factory-floor environments.
At 20 Mbps the SN65HVD75DGK can clock a full-speed PROFIBUS segment or a high-throughput sensor network. Half-duplex means the driver and receiver share the same pair of wires, so the firmware must manage direction control — typically by toggling the driver enable pin around each transmission. This is standard for RS-485 multidrop buses; the trade-off is one less twisted pair versus a full-duplex part, which saves cable cost and connector pins.