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7.6: Exercises

  • Page ID
    26993
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    1. Implement the 2-to-4 decoder using 7404 (NOT) and 7808 (AND) chips on your breadboard.
    2. Implement the 2-to-4 decoder circuit with a 74139 chip on your breadboard.
    3. Implement a 1-to-2 decoder in Logisim. Implement this circuit on your breadboard.
    4. Implement a 3-to-8 decoder using NOT and AND gates in Logisim. Show that it is correct by showing it generates the same output as a 3-to-8 Decoder found in the Plexors menu of Logisim.
    5. In Logisim, implement a 3-to-8 decoder using two 2-to-4 decoders, and as many AND gates as you need. Compare the total number of AND gates in the circuit to the number of AND gates used to implement the 3-to-8 decoder with 2-input AND gates in question 4. Which circuit do you think is faster?
    6. Answer the following questions.
      1. How many output lines would a 4 input decoder have?
      2. How many output lines would a 5 input decoder have?
      3. For an N-to-X decoder, specify X as a function of N (e.g. specify the number of output lines as a function of the number of input lines for a decoder).

    This page titled 7.6: Exercises is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Charles W. Kann III via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.

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