The HT487EARZ is a SOP-8 ROHS RS-485/RS-422 IC manufactured by HTCSEMI for bi-directional serial communication over short to long distances. It is designed to provide full-duplex asynchronous communication with both half-duplex and full-duplex bitrates, over standard twisted pair copper wire or shielded cables. It also supports clock synchronization rate function for modems, and auto-detection for RS-485/RS-422 operations, so no manual configuration is required. The IC is designed with low power consumption and provides advanced protection features, such as over-temperature, over-voltage, overload protection, and built-in filters, for robust and reliable communication.