4 to 16 line Decoder / Demultiplexer 74LS154

The 74HC154 is a 4- to 16-line decoder/demultiplexer with two enable inputs, E1 and E2.
A High on either enable input forces the output into the High state. The demultiplexing function is performed by using the four input lines, A0 to A3, to select the output lines Y0 to Y15, and using one enable as the data input while holding the other enable low.