A digital multiplexer can be used for which of the following ?
1. Parallel-to-serial conversion
2. Many-to-one switch
3. To generate memory chip select
4. For code conversion
Select the correct answer using the code given below :
UGC NET - 2013,
Answer: C
A digital multiplexer selects one of many inputs, so it works as a many-to-one switch, and by selecting the bits in turn it converts parallel data to serial data. Both are correct. Generating a memory chip select is the job of a decoder, and code conversion is normally done by a decoder or encoder (a multiplexer can do it only as a look-up table), so the official key keeps the first two. In practice a multiplexer is used as a data selector, a parallel-to-serial converter, a logic function generator and in time-division switching, which is why the first two points are accepted. The answer is 1 and 2.
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