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Multiplexer Knowledge
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Multiplexers can be used to connect PBX, Hot line and other devices of network from central site to user site through fiber optical cable.
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Multiplexer Knowledge
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Understanding 4 to 1 Multiplexer
The 4-to-1 multiplexer has 4 input bit, 2 control bits, and 1 output bit. The four input bits are D0, D1, D2 and D3. Only one of this is transmitted to the output y. The output depends on the value of AB which is the control input. The control input determines which of the input data bit is transmitted to the output.
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For instance, as shown in fig. when AB = 00, the upper AND gate is enabled while all other AND gates are disabled. Therefore, data bit D0 is transmitted to the output, giving Y = Do.
4 to 1 Multiplexer Circuit Diagram
If the control input is changed to AB =11, all gates are disabled except the bottom AND gate. In this case, D3 is transmitted to the output and Y = D3.
• An example of 4-to-1 multiplexer is IC 74153 in which the output is same as the input.
• Another example of 4-to-1 multiplexer is 45352 in which the output is the compliment of the input.
• Example of 16-to-1 line multiplexer is IC74150.
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