The 74HC154; 74HCT154 is a 4-to-16 line decoder/demultiplexer. It
decodes four binary weighted address inputs (A0 to A3) to
sixteen mutually exclusive outputs (Y0 to Y15). The device features
two input enable (E0 and E1) inputs. A HIGH on either of the
input enables forces the outputs HIGH. The device can be used as a
1-to-16 demultiplexer by using one of the enable inputs as the
multiplexed data input. When the other enable input is LOW the
addressed output will follow the state of the applied data. Inputs
include clamp diodes. This enables the use of current limiting
resistors to interface inputs to voltages in excess of VCC.
