CD74HC4515M (TEXAS INSTRUMENTS)

The CD74HC4515M is a 4-to-16 line high speed CMOS Decoder/Demultiplexer with input latches. It consist of a 4-bit strobed latch and a 4-to-16 line decoder. The selected output is enabled by a low on the enable input (E). A high on E inhibits selection of any output. Demultiplexing is accomplished by using the E input as the data input and the select inputs (A0-A3) as addresses. This E input also serves as a chip select when these devices are cascaded. When LE is high the output follows changes in the inputs (see truth table). When LE is low the output is isolated from changes in the input and remains at the level (low for the 4515) it had before the latches were enabled.