STMICROELECTRONICS ST485BDR RS485/422 Transceiver, 5V

The STMICROELECTRONICS ST485BDR is a high-performance, low-power transceiver designed for robust RS-485 and RS-422 serial communication. Each device integrates one driver and one receiver, facilitating reliable bidirectional data exchange on multipoint bus transmission lines commonly used in industrial and networking applications.

Engineered for efficiency, this transceiver draws a minimal 300µA of supply current (typical) whether unloaded or fully loaded with disabled drivers, making it an excellent choice for power-sensitive systems. For enhanced system protection, the driver features short-circuit current limiting and is safeguarded by thermal shutdown circuitry. In the event of excessive power dissipation, this protection places the driver outputs into a safe, high-impedance state, preventing damage.

The device supports the connection of up to 64 transceivers on a single bus and ensures bus integrity by maintaining a high-impedance state in three-state mode or when power is off, preventing unwanted loading. Key performance characteristics include a typical input hysteresis of 70mV for improved noise immunity, a swift 30ns propagation delay, and a minimal 5ns skew for precise data timing.

Housed in a compact 8-pin SOIC package, the ST485BDR offers a maximum data rate of 2.5Mbps and operates from a 4.75V to 5.25V supply, ensuring compatibility with standard 5V logic systems. Its robust design is suitable for a wide operating temperature range from -40°C to 85°C, guaranteeing reliable performance in harsh industrial environments.