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Lab Manuals for Digital System Design - DSD By Minakshi Das

  • Digital System Design - DSD
  • Practical
  • Guwahati University institute of science and technology - GUIST
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: Digital System Laboratory : Page |1 Experiment no: 1(a) Title: Verification of Logic Gates Aim of the Experiment: To verify the logic gates (i) AND gate, (ii) OR gate, (iii) NAND gate, (iv) NOT gate, (v) NOR gate, (vi) EX-OR gate (A) Using ICs(i) 7400 (ii) 7402 (iii) 7408, (iv) 7432 (v) 7486, (vi) 7404 Apparatus Required: Sl No. Apparatus/Component Range/Specifications 01 Digital Trainer Kit OMEGA DL1044 02 ICs AND,OR, NAND, NOT, EX-OR ,NOR Gate 7408,7432,7400, 7404, 7486,7402 03 Patch Wire Quantity 01 01 each As required Theory: Logic gates are electronic circuits which perform logical functions on one or more inputs to produce one output. When all the input combinations of a logic gate are written in a series and their corresponding outputs written along them, then this input/ output combination is called Truth Table. Various gates and their working is explained here. AND Gate:AND gate produces an output as 1, when all its inputs are 1; otherwise the output is 0. This gate can have minimum 2 inputs but output is always one. Its output is 0 when any input is 0. Fig 1.1.1: IC 7408 (AND) Fig 1.1.1: IC 7432 (OR) Department of Electronics & Communication Engineering, Institute of Science & Technology, Gauhati University, Guwahati-14

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: Digital System Laboratory : Page |2 OR Gate:OR gate produces an output as 1, when any or all its inputs are 1; otherwise the output is 0. This gate can have minimum 2 inputs but output is always one. Its output is 0 when all input are 0. NOT Gate:NOT gate produces the complement of its input. This gate is also called an INVERTER. It always has one input and one output. Its output is 0 when input is 1 and output is 1 when input is 0. Fig 1.1.1: IC 7404 (NOT) Fig 1.1.1: IC 7400 (NAND) NAND Gate NAND gate is actually a series of AND gate with NOT gate. If we connect the output of an AND gate to the input of a NOT gate, this combination will work as NOT-AND or NAND gate. Its output is 1 when any or all inputs are 0, otherwise output is 1. NOR Gate NOR gate is actually a series of OR gate with NOT gate. If we connect the output of an OR gate to the input of a NOT gate, this combination will work as NOT-OR or NOR gate. Its output is 0 when any or all inputs are 1, otherwise output is 1. Fig 1.1.1: IC 7402 (NOR) Fig 1.1.1: IC 7402 (XOR) Department of Electronics & Communication Engineering, Institute of Science & Technology, Gauhati University, Guwahati-14

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: Digital System Laboratory : Page |3 Exclusive OR (X-OR) Gate X-OR gate produces an output as 1, when number of 1’s at its inputs is ODD, otherwise output is 0. It has two inputs and one output. Procedure: 1. Connect the trainer kit to ac power supply. 2. Connect the inputs of any one logic gate to the logic sources and its output to the logic indicator. 3. Apply various input combinations and observe output for each one. 4. Verify the truth table for each input/ output combination. 5. Repeat the process for all other logic gates. 6. Switch off the ac power supply. Observation Table: -:TRUTH TABLES:- AND Gate INPUT A B 0 OR Gate OUTPUT Y LED indication Voltage at o/p (V) INPUT A B 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 OUTPUT Y LED indication Voltage at o/p (V) Department of Electronics & Communication Engineering, Institute of Science & Technology, Gauhati University, Guwahati-14

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: Digital System Laboratory : Page |4 NAND Gate NOT Gate OUTPUT INPUT OUTPUT Y LED indication Voltage at o/p (V) A Y LED indication Voltage at o/p (V) INPUT A B 0 0 0 0 1 1 1 0 1 1 EX-OR Gate INPUT A B 0 NOR Gate OUTPUT Y LED indication Voltage at o/p (V) INPUT A B 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 OUTPUT Y LED indication Voltage at o/p (V) Precautions: • All the connections should be correct. • Parallax error should be avoided while taking the readings from the Analog meters. • The VCC and ground of IC should be connected properly. Result/Conclusion: EXPECTED VIVA QESTIONS: Department of Electronics & Communication Engineering, Institute of Science & Technology, Gauhati University, Guwahati-14

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