This is useful in several applications. In the mine, the "ground” switches between the eight contacts contained in the computer. It can also be used to switch eight analog inputs to an A/D converter. The three pins and the enable determine which of the eight pins the common pin switches to. Since it's CMOS, the supply voltage can only be 2 volts, which is important because the computer can supply 3.3 volts but not 5 volts.
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