RS-485/422 half-duplex transceiver with 130 mV hysteresis
The receiver includes 130 mV of hysteresis, which improves noise immunity on long or electrically noisy cable runs — a practical advantage in factory-floor or outdoor telecom installations.
Half-duplex bus — design implications
Because the part is half-duplex, the driver and receiver share the same differential bus pair. The transmitter enable (DE) and receiver enable (RE) pins must be toggled to control bus direction — typically tied together or driven by a UART's RTS signal. This topology is standard for RS-485 multi-drop networks where only one node drives at a time.