Networking Transceiver Simplifies Designs, Saves Space

Simplifying design chores, saving space and costs, STMicroelectronics’ STR485LV 3.3V transceiver for RS485 applications provides an external pin to select 20 Mb/s or 250kb/s communication and interfacing directly with low-voltage logic down to 1.8V. The user-selectable data rate allows designers to specify the same device and thus simplify inventory management for RS485-networking applications, ranging from high-speed/short-range up to the maximum communication distance (4000 feet) depending on cable performance. It is suitable for a wide variety of applications including telecom infrastructure, high-speed data links, or low-voltage microcontroller communications.


Users can connect low-voltage logic devices from 1.8V to 3.3V directly, without needing level-shifting components, leveraging the 1.65-3.6V supply-voltage range for data and enable signals. By maintaining internal driver-output resistance above 96Ω up to +105°C, the STR485 allows up to 256 transceivers on the same bus in accordance with the RS485 specification.

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Safety features include thermal shutdown to prevent bus contention or faults causing excessive power consumption, and a receiver failsafe mode that prevents errors if inputs are idle, shorted, or unconnected. The bus pins withstand over ±8-kV contact discharge and ±16-kV air discharge without latch-up, exceeding IEC 61000-4-2 specifications, and are resistant to IEC61000-4-4 fast transient burst class-B. 


Packaged as a 3mm x 3mm DFN10 featuring flow-through logic-to-bus pinning, the STR485 is available now, priced from $1.55 each/1,000. For deeper knowledge and enlightenment, download the STR485LV datasheet.

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