Implement Full Adder using 1:8 DEMUX | Number System and Code | Digital Circuit Design in EXTC | Summary and Q&A

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March 19, 2021
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Implement Full Adder using 1:8 DEMUX | Number System and Code | Digital Circuit Design in EXTC

TL;DR

This video explains how to design a full adder using a 1-to-8 demultiplexer.

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Key Insights

  • 🫦 A full adder is a circuit used for binary addition of three single binary bits, producing sum and carry outputs.
  • 🍹 The truth table for a full adder helps determine the values for the sum and carry outputs for all possible input combinations.
  • 🫥 A 1-to-8 demultiplexer can be used to implement the circuit for a full adder, with the inputs acting as select lines for the demultiplexer.
  • 🤑 The expressions for sum and carry are obtained by identifying the ones and their corresponding input terms from the truth table.
  • 🍹 Separate OR gates are used to realize the circuit for the sum and carry outputs.
  • 🔠 The 1-to-8 demultiplexer has one input, an enabled terminal connected to logic one, and eight outputs.
  • 🫥 The select lines for the demultiplexer are determined by the inputs of the full adder.

Transcript

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Questions & Answers

Q: What is the purpose of a full adder?

A full adder is used to add three single binary bits, producing two outputs (sum and carry).

Q: How can a truth table be used to design a full adder?

By creating a truth table that considers all possible input combinations, the values for the sum and carry outputs can be determined through binary addition.

Q: What is the role of a 1-to-8 demultiplexer in the design?

The 1-to-8 demultiplexer is used to implement the full adder circuit. It has one input, an enabled terminal (connected to logic one), and eight outputs.

Q: How are the sum and carry expressions obtained?

The expressions for sum and carry are obtained by collecting the ones and their corresponding input terms from the truth table.

Summary & Key Takeaways

  • The video discusses the process of implementing a full adder using a 1-to-8 demultiplexer.

  • It explains the truth table for the full adder and demonstrates how to obtain the values for the sum and carry outputs.

  • The video then shows how to use a 1-to-8 demultiplexer to realize the circuit diagram for the full adder.

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