COA | DE-Multiplexers

COA (Combinational Digital Circuits) are building blocks in digital circuits that perform logical operations on input signals to generate output signals. DE-multiplexers are one of the many types of COA.

What is a DE-Multiplexer?

A DE-Multiplexer is a combinational circuit that takes a single input signal and selects one of several output signals. It is the opposite of a Multiplexer (MUX), which takes multiple input signals and selects one output signal. DE-Multiplexers are also known as "data selectors".

How does a DE-Multiplexer work?

A DE-Multiplexer consists of a single input terminal, several output terminals, and a set of selection lines. The selection lines determine which output terminal will be connected to the input terminal. The number of output terminals in a DE-Multiplexer is equal to 2^n, where n is the number of selection lines.

The truth table for a 2:1 DE-Multiplexer is shown below:

| S | Y0 | Y1 | |---|----|----| | 0 | X | 0 | | 1 | 0 | X |

In this truth table, S is the selection line, X is the input signal, Y0 is one of the output signals, and Y1 is the other output signal.

If the selection line is 0, the DE-Multiplexer selects Y0 and outputs the input signal. If the selection line is 1, the DE-Multiplexer selects Y1 and outputs a logic 0.

Applications of DE-Multiplexers

DE-Multiplexers can be used in digital circuits for a variety of purposes, including:

• Address decoding in memory systems
• Selecting data from multiple sources
• Demultiplexing a single data stream into multiple data streams
• Switching between data sources

Conclusion

DE-Multiplexers are a useful building block in digital circuits for selecting one of several output signals based on a selection line. They can be used in a variety of applications such as address decoding and data selection.