The ST485ERB is a low power RS-485/RS-422 transceiver from ST company. Its features are low quiescent current (300μA), support -7V to 12V input voltage range, can keep the driver in high impedance through 3-state or power off, has 70mV typical input hysteresis, 30ns propagation delay and 5ns skew, single 5V power supply, overload protection, ESD protection and other functions.