Digital Circuit Fundamentals 2 Unit 4 – Multiplexer and Demultiplexer
UNIT 4 – MULTIPLEXER AND DEMULTIPLEXER
UNIT OBJECTIVE
At the completion of this unit, you will be able to operate and control a multiplexer and
demultiplexer circuit.
UNIT FUNDAMENTALS
The 74LS151 multiplexer on your circuit board is a 1-of-8 data selector. It is an MSI device
with a gate complexity of 17 equivalent gates.
A multiplexer allows the selection of one data source from a group. You can connect the output
to any of the input data sources (A through D) by positioning the multiplexer pointer.
In this multiplexer, input data source C is selected. This input passes through the multiplexer
pointer to the output. Data sources A, B, and D have no effect on the multiplexer output.