Which of the following can be used as a parallel to series converter?
Multiplexer
Understanding Parallel to Series Conversion
The question asks to identify a digital electronic component that can perform a parallel to series conversion. This type of conversion involves taking data that is available on multiple lines simultaneously (parallel) and transmitting it sequentially, one bit at a time, over a single line (serial).
Analyzing the Options
Let's examine how each given option functions:
- Decoder: A decoder takes a coded input (like binary) and activates one of its multiple output lines based on the input code. It doesn't inherently convert parallel data to a serial stream. For example, a 2-to-4 decoder takes a 2-bit input and activates one of four outputs.
- Digital Counter: A digital counter is a circuit that counts clock pulses. It generates a sequence of outputs representing the count. While counters are used in sequencing operations, they are not designed primarily for converting parallel data into a serial format.
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Multiplexer (MUX): A multiplexer acts like a digitally controlled switch. It has multiple input lines and one output line. Based on the control signals applied to its select lines, the MUX directs the data from one of the input lines to the output line.
A multiplexer can be used as a parallel to series converter. Imagine connecting the parallel data bits (D0, D1, D2, D3, ...) to the different input lines of a MUX. By feeding a sequential counter to the select lines of the MUX, we can select each input line one by one. This causes the parallel data bits to be outputted sequentially onto the single output line, effectively converting the parallel data into a serial stream.
For instance, using a 4-bit parallel input (D0, D1, D2, D3) and a 2-bit select input (S1, S0):
- When S1S0 = 00, D0 is outputted.
- When S1S0 = 01, D1 is outputted.
- When S1S0 = 10, D2 is outputted.
- When S1S0 = 11, D3 is outputted.
By incrementing the select lines (00, 01, 10, 11) with each clock pulse, the parallel data is transmitted serially.
- De-multiplexer (DeMUX): A de-multiplexer performs the opposite function of a multiplexer. It takes a single input line and routes it to one of multiple output lines, based on the select signals. This is typically used for series-to-parallel conversion, not parallel-to-series.
Conclusion
Based on the functions described, the Multiplexer is the component specifically suited for performing a parallel to series conversion by sequentially selecting parallel data inputs and outputting them over a single line.
Important Questions from Multiplexer
The device which changes from serial data to parallel data is:
Consider a logic gate circuit. with 8 input lines (D 0, D 1..... D 7) and 3 output lines (A 0, A 1, A 2) specified by following operations
A 2= D 4+ D 5+ D 6+ D 7
A 1= D 2+ D 3+ D 6+ D 7
A 0= D 1+ D 3+ D 5+ D 0
Where + indicates logical OR operation. This circuit is
Which of the following statements are true?
A. Frequency division multiplexing technique can be handled by digital circuits.
B. Time division multiplexing technique can be handled by analog circuits
C. Wavelength division multiplexing technique is used with optical fiber for combining two signals.
D. Frequency division multiplexing technique can be applied when the bandwidth of a link is greater than the bandwidth of the signals to be transmitted.
Choose the correct answer from the options given below :
Consider the sentence below.
There is a country that borders both India and Pakistan.
Which of the following logical expressions express the above sentence correctly when the predicate Country(x) represents that x is a country and Borders(x, y) represents that the countries x and y share the border?
A digital computer has a common bus system for 8 registers 16 bits each. How many multiplexers are required to implement common bus? What size of multiplexers is required?
