The MC74LVX157 is an advanced high speed CMOS quad 2-channel multiplexer. The inputs tolerate voltages up to 7.0 V, allowing the interface of 5.0 V systems to 3.0 V systems. It consists of four 2-input digital multiplexers with common select (S) and enable (E) inputs. When E is held High, selection of data is inhibited and all the outputs go Low. The select decoding determines whether the I0 n or I1 n inputs get routed to the corresponding Z n outputs.