The 74HC/HCT4514 are 4-to-16 line
decoders/demultiplexers having four binary weighted
address inputs (A0 to A3), with latches, a latch enable input
(LE), and an active LOW enable input (E). The 16 outputs
(Q0 to Q15) are mutually exclusive active HIGH. When LE
is HIGH, the selected output is determined by the data on
An.
When LE goes LOW, the last data present at An are
stored in the latches and the outputs remain stable. When
E is LOW, the selected output, determined by the contents
of the latch, is HIGH. At E HIGH, all outputs are LOW. The
enable input (E) does not affect the state of the latch.
When the “4514” is used as a demultiplexer, E is the data
input and A0 to A3 are the address inputs.
