解码器：
该解码器是一个组合逻辑电路，其目的是对提供给它的数据进行解码。它由 n 条输入线和 2*n 条输出线组成。对于每一种可能的输入条件，都有不同的输出信号，根据输入，只有一个输出信号会产生逻辑。因此，这个 n 到 2n 解码器也称为最小项生成器，其中每个输出仅在特定输入上产生结果。
解复用器：
这个解复用器与解码器有点相似，但它也包含选择线。它用于通过多条输出线发送单个输入。它接受来自一个输入信号的数据，并通过提供的输出线数进行传输。它包含数据输入线、选择线和输出线。
解码器和解复用器的区别：
| S.No. | Comparison | Decoder | Demultiplexer |
|---|---|---|---|
| 1. | Basic | These are Logic circuit which decodes an encrypted input stream from one to another format. | It is a Combination circuit which routes a single input signal to one of several output signals. |
| 2. | Input/Output | n number of input lines and 2n number of output lines. | n number of select lines and 2n number of output lines. |
| 3. | Inverse of | Encoder. | Multiplexer. |
| 4. | Application | In Detection of bits, data encoding. | In Distribution of the data, switching. |
| 5. | Use | It is used for changing the format of the instruction in the machine specific language. | It is used as a routing device to route the data coming from one signal into multiple signals. |
| 6. | Select Lines | Not contains. | Contains. |
| 7. | Implementation | Majorly implemented in the networking application. | Employed in data-intensive applications where data need to be changed into another form. |