The DG506A, DG507A, DG508A and DG509A are CMOS Monolithic 16-Channel/Dual 8-Channel and 8-Channel/Dual 4-Channel Analog Multiplexers, which can also be used as demultiplexers. An enable input is provided. When the enable input is high, a channel is selected by the address inputs, and when low, all channels are off.