The HEF4053BT is a three-way single-pole double-throw (SPDT) analog switch suitable for use as an analog or digital multiplexer\/demultiplexer. Each switch has a digital selection input (Sn), two independent inputs\/outputs (nY0 and nY1), and a universal input\/output (nZ). All three switches share an enable input (E). E is high voltage, all switches are in a high impedance off state, not affected by Sn.