The first design decision is to determine if two-wire or three-wire mode can be used in the application. For this design, note that the overall propagation delay is less than 4 µs and only three-wire mode is able to meet this requirement. In this case, two-wire mode is not applicable. Two-wire mode, due to its limited power transfer, is typically limited to very low frequency applications of less than a few kHz or when enable times are not critical.