Experiment No 01:

Design of 3:8 Decoder using Logic Gates

Title

3:8 Decoder

Aim

To design 3:8 decoder using logic gate (3 bit binary number to octal number)

Learning Outcomes

At the end of this experiment students are able to

LO1: Define decoder and its significance.

LO2: Construct truth table of 3:8 decoder

LO3: Design combinational logic circuit using logic gates

LO4: Elaborate applications of decoder

Apparatus

Software implementation: Use of any digital circuit simulator or use online simulator www.falstad.com/circuit/

Hardware implementation: Digital trainer kit, IC74LS11-3 numbers, IC7400-1nos

Theory

A decoder is a combinational logic circuit which is used to change the code into a set of signals. It is the reverse process of an encoder. A decoder circuit takes multiple inputs and gives multiple outputs. A decoder circuit takes binary data of ‘n’ inputs into ‘2^n’ unique output. In addition to input pins, the decoder has a enable pin. This enables the pin when negated, makes the circuit inactive. in this article, we discuss 3 to 8 line Decoder and Multiplexer.

To understand theory of decoder refer video attached

Truth Table:

Truth Table 3:8 decoder

Combinational Logic Circuit:

Simulation Circuit:

To simulate above circuit, you can use any software with digital logic elements.

Use following website for design https://www.falstad.com/circuit/circuitjs.html

Here one such online simulator is given in following link with total simulation of 2:4 decoder.

tinyurl.com/y6lql7s3

By changing inputs, check respective output as per truth table (2:4 decoder)

Students should design 3:8 decoder in same online circuit software and have to paste link in following google give in question and answer:

Questions and Answers:

Simulate 3:8 decoder using https://www.falstad.com/circuit/circuitjs.html this software and upload link in following google form.

It also have questions and answers in quiz form which will be counted for your grades

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