SIT3491E is a 3. 0V~5. 5V powered, full-duplex, low power dissipation RS-485 transceiver fully meeting the requirements of RS-485 & RS-422 standard. SIT3491E contains one driver and one receiver, both can transmit signals independently. The SIT3491E has a 1/8-unit-load. It allows up to 256 transceivers on the bus and error-free data transmission up to 12Mbps. SIT3491E has a working voltage range of 3. 0V~5. 5V, with the functions of fail-safe, current-limiting protection, over-voltage protection, etc. SIT3491E has excellent ESD release capability, and HBM reaches ±15kV.