The RD74VT1G245 has one buffer in a 6 pin package. When DIR is high, data is transferred from the A inputs to the B outputs, and when DIR is low, data is transferred from the B inputs to the A outputs. And this product has two terminals (VCCA, VCCB), VCCA is connected with control input and A bus side VCCB is connected with B bus side. VCCA and VCCB are isolated. The A port is designed to track VCCA, which accepts voltages from 1.2V to 3.6V, and the B port is designed to track VCCB, which operation at 1.2V to 3.6V. Therefore, Bidirectional board voltage conversion is which