ISL43485 3.3V Half Duplex 30Mbps RS-485/RS-422 Transceiver

The Intersil ISL43485 is a high-speed BiCMOS transceiver powered by 3.3V, designed to comply with both RS-485 and RS-422 standards for balanced communication. This transceiver is specified for power supply tolerances of 10%, ranging from 3V to 3.6V. The receiver (Rx) inputs incorporate a "fail-safe if open" design, which guarantees a high logic output when the Rx inputs are floating. The ISL43485 presents a "single unit load" to the RS-485 bus, enabling the connection of up to 32 transceivers on the network. The driver (Tx) outputs are equipped with short circuit protection, capable of handling voltages that exceed the power supply voltage. Furthermore, the device includes on-chip thermal shutdown circuitry that disables the Tx outputs to prevent damage due to excessive power dissipation.

The ISL43485 transceiver is engineered for high-speed data transmission, making it suitable for applications requiring reliable communication over long distances. Its compliance with RS-485 and RS-422 standards ensures compatibility with a wide range of devices and systems. The fail-safe feature of the Rx inputs is particularly beneficial in multi-drop configurations, where the possibility of open circuits can lead to erroneous data transmission. By providing a high logic level when the inputs are floating, the ISL43485 enhances the robustness of the communication network.

The single unit load characteristic is crucial for systems that require multiple transceivers on the same bus. With the ability to connect up to 32 devices, the ISL43485 facilitates the design of complex networks without the need for additional buffering or amplification stages, thus simplifying circuit design and reducing costs.

The short circuit protection on the Tx outputs ensures that the transceiver can withstand fault conditions without sustaining damage, which is vital in industrial environments where electrical noise and surges may occur. The thermal shutdown feature adds an additional layer of protection, automatically disabling the outputs in the event of overheating, thereby preserving the integrity of the device and the overall system.

In summary, the Intersil ISL43485 transceiver is a versatile and reliable component for balanced communication applications, combining advanced features such as fail-safe inputs, high output capability, and robust protection mechanisms to ensure stable operation in demanding environments. Its design considerations make it an excellent choice for engineers seeking to implement reliable data communication solutions.The Intersil ISL43485 is a high speed BiCMOS 3. 3V powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. Unlike some competitive devices, this Intersil transceiver is specified for 10% tolerance supplies (3V to 3.

6V). Receiver (Rx) inputs feature a "fail-safe if open" design, which ensures a logic h igh output if Rx inputs are floating, and the ISL43485 presents a "single unit load" to the RS-485 bus, which allows up to 32 transceivers on the network. Driver (Tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage.

Additionally, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive. 🔗 External reference