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Multiplexer Knowledge
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Understanding 1 to 4 Demultiplexer
Demultiplexer means one to many. A demultiplexer is a circuit with one input and many output. By applying control signal, we can steer any input to the output. Few types of demultiplexer are 1-to 2, 1-to-4, 1-to-8 and 1-to 16 demultiplexer.
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1-64 Channels Video Multiplexer
Following figure illustrate the general idea of a demultiplexer with 1 input signal, m control signals, and n output signals.
Demultiplexer Pin Diagram
The 1-to-4 demultiplexer has 1 input bit, 2 control bit, and 4 output bits. An example of 1-to-4 demultiplexer is IC 74155. The 1-to-4 demultiplexer is shown in figure below:
1 to 4 Dempultiplexer Circuit Diagram
The input bit is labeled as Data D. This data bit is transmitted to the data bit of the output lines. This depends on the value of AB, the control input.
When AB = 01, the upper second AND gate is enabled while other AND gates are disabled. Therefore, only data bit D is transmitted to the output, giving Y1 = Data.
If D is low, Y1 is low. IF D is high, Y1 is high. The value of Y1 depends upon the value of D. All other outputs are in low state.
If the control input is changed to AB = 10, all the gates are disabled except the third AND gate from the top. Then, D is transmitted only to the Y2 output, and Y2 = Data.
Example of 1-to-16 demultiplexer is IC 74154 it has 1 input bit, 4 control bits and 16 output bit.
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