Decoder vs Demultiplexer
Q.1: How does a Decoder work?
Answer:
A decoder operates by activating a specific output line that corresponds to the binary value represented by its input lines. For example, in a 2-to-4 decoder, two input lines represent the binary value (00, 01, 10, or 11), and one of the four output lines is activated based on the input combination.
Q.2: How does a Demultiplexer work?
Answer:
A demultiplexer directs the input signal to one of its output lines based on the value of the selection line. If there are ‘n’ output lines, the demultiplexer has a ‘log2(n)’ bit selection input. The input signal is then directed to the output line corresponding to the binary value of the selection input.
Q.3: Can a Demultiplexer be built using Decoders?
Answer:
Yes, a demultiplexer can be constructed using multiple decoders. By connecting the outputs of the decoders to the appropriate output lines of the demultiplexer and using the selection input to enable one of the decoders, you can achieve demultiplexing functionality.
Difference between Decoder and Demultiplexer
Decoders and Demultiplexers both are digital logic components used in electronic circuits to perform specific tasks related to signal routing and control. While they might seem similar at first glance, they serve different purposes and have distinct characteristics. Here’s an explanation of the key differences between a decoder and a demultiplexer.