Now, the thing to remember is that we are using a CD4512 chip, whose truth table is shown below. The important thing to note here is that, in addition to the three multiplexer select controls, A, B, ...

The continuing need for basic analog-function components. The characteristics of a tiny 4:1 multiplexer/1:4 demultiplexer for analog signals. How an evaluation board simplifies checkout of this analog ...