The ST485ER from STMicroelectronics is a versatile low-power transceiver for RS-485 and RS-422 communication, providing a robust solution for transmitting data over long distances and in electrically noisy environments. This device is designed to operate with a single 5V power supply and is fully compliant with the EIA/TIA-485 and RS-422 standards.

Key Features

• Low Quiescent Current: The ST485ER is optimized for low-power consumption, drawing only 300 µA of supply current, making it suitable for energy-sensitive applications.
• Wide Common-Mode Range: It can handle common-mode voltages from -7V to +12V, enhancing the transceiver's ability to withstand electrical noise and ground potential differences.
• High Data Rate: Capable of operating at speeds up to 5 Mbps, the ST485ER is ideal for high-speed data communication.
• Thermal Shutdown Protection: Integrated thermal shutdown protection ensures that the device remains safe even under fault conditions that lead to excessive power dissipation.
• Driver Dominant Time-out: The driver features a dominant time-out function that prevents the driver from locking up in the dominant state, thus enhancing bus safety and reliability.
• Fail-safe Receiver: Even when the bus is idle, open, or shorted, the receiver guarantees a known output voltage level, ensuring signal integrity.

Applications

The ST485ER transceiver is particularly well-suited for industrial applications where long cable lengths and electromagnetic interference (EMI) can pose significant challenges. It is commonly used in:

• Factory automation and process control systems
• Building automation, HVAC, and smart grid infrastructure
• Networking and telecommunication equipment
• Security systems, such as access control and surveillance

Package and Quality

The device is available in a narrow 8-pin SOIC package, providing a compact solution that is easy to integrate into a wide range of industrial designs. STMicroelectronics' commitment to quality ensures that the ST485ER transceiver meets the highest standards of reliability and performance.