4- Circuitos Combinacionales - Multiplexores y Demultiplexores

Summary

This video script covers the concepts of multiplexers and demultiplexers. It explains how multiplexers route data from multiple input sources to a single output line, using selectors to determine which input data will be transmitted. The script also provides examples of 4-input multiplexers, detailing the use of selectors and logical functions in their design. Additionally, it introduces demultiplexers, which perform the reverse function, distributing data to multiple outputs. The video compares multiplexers to decoders and highlights their similarities, making it clear how both components function in digital circuits.

Takeaways

• 😀 Multiplexers are circuits that route data from multiple input sources to a single output line using selectors to choose which input will pass through.
• 😀 The number of selectors required for a multiplexer with n inputs is calculated using the formula 2^s ≥ n, where s is the number of selectors.
• 😀 A graphical example of multiplexing shows how data from three computers combines into a single output line and then redistributes to separate computers on the other side.
• 😀 A multiplexer functions by combining inputs through a single output line, with selectors controlling which input is reflected at the output.
• 😀 For a 4-input multiplexer, two selectors are required, as 2^2 = 4.
• 😀 The logical table for a multiplexer outlines how different combinations of selector states result in the output corresponding to one of the input values.
• 😀 The function for a 4-input multiplexer is expressed using a combination of AND and OR gates, which select the appropriate input based on the selector states.
• 😀 Demultiplexers perform the inverse operation of multiplexers, distributing a single input to multiple outputs based on selector states.
• 😀 In a demultiplexer with n outputs, the number of selectors is also calculated using 2^s ≥ n, where s is the number of selectors.
• 😀 A 4-output demultiplexer involves determining the appropriate selector values for each output, ensuring that only one output receives the input at any given time.
• 😀 Multiplexers and demultiplexers are similar to decoders, with the key difference being that multiplexers handle one input and multiple outputs, while decoders typically have multiple inputs and one output.

Q & A

What is a multiplexer?

A multiplexer is a circuit that transmits data from multiple input sources to a single output line. It uses selectors to decide which input data will be sent to the output.

How is the number of selectors in a multiplexer determined?

The number of selectors (s) in a multiplexer is determined by the formula 2^s ≥ n, where n is the number of inputs.

What does a multiplexed system do?

In a multiplexed system, data from multiple sources is combined into a single line, which is then sent to a multiplexer for distribution or processing.

Can you describe a multiplexer with four inputs?

A multiplexer with four inputs has four lines (D0, D1, D2, D3) and two selectors (S0, S1). The selectors determine which input data will be passed to the output. The function is defined by a logical expression that depends on the states of the selectors.

How do the selectors in a multiplexer influence the output?

The selectors in a multiplexer choose which input data is passed to the output by combining different states of the selectors (such as 0 or 1) to match the corresponding input.

What is the logic table used for in a multiplexer?

The logic table for a multiplexer defines the combination of selector states (S0, S1) and the corresponding output (F). It specifies which input line is selected for the output based on the selectors' values.

What is the purpose of AND and OR gates in the multiplexer circuit?

AND gates are used to combine the input data with the selector states, while OR gates combine the results of the AND gates to produce the final output.

How do demultiplexers differ from multiplexers?

A demultiplexer performs the inverse task of a multiplexer. It takes a single input and distributes it to multiple output lines based on selectors, whereas a multiplexer combines multiple inputs into a single output.

How are the selectors for a demultiplexer calculated?

For a demultiplexer with 'n' outputs, the number of selectors is calculated using the formula 2^s ≥ n, where 's' is the number of selectors needed.

What is a key difference between multiplexers and decoders?

Multiplexers and decoders are similar, but the main difference is that multiplexers have one data input and multiple output lines, while decoders typically convert a binary code into a one-hot output format, without handling input data flow like multiplexers.