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o Study of NOR Gate and verification of output with truth-table.

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Apparatus required:-The following electronics components are required.
•NOR Gate (IC-7402)
•Digital IC Trainer KIT
•Breadboard
•Connecting wires
Description:-
Circuit that takes the logical decision and the process are called logic gates. Each gate has one or more input and only one output. OR, AND & NOT are basic gates. NAND, NOR and X-OR are known as universal gates.
The NOR gate is a contraction of OR-NOT. The output is high when both inputs are low. The output is low when one or both inputs are high. This is a NOT-OR gate which is equal to an OR gate followed by a NOT gate. The outputs of all NOR gates are low if any of the inputs are high. The symbol is an OR gate with a small circle on the output. The small circle represents inversion.
Symbol:-


Schematic Pin Diagram:-
Pin Diagram of NOR Gate:-
Truth-Table:-
Boolean Expression: -
Inputs are A and B and Output (Y) will be NOT (A+B) so expression is Y= Bar (A+B)
Procedure to Perform:-
•Take Digital Trainer KIT including Breadboard, IC 7402 and connecting leads (wires).
•Insert IC on the Breadboard.
•According to pin configuration of IC perform the connections.
•Connect VCC (+5V) to pin no.14 and Connect Pin no. 7 to GND of IC.
•Connect the NOR Gate input connection to the input switched D0 and D1 to the Digital Trainer KIT(Inputs are pin no (2,3),(5,6),(8,9),(11,12) and Outputs are pin no 1, 4, 10, 13).
•Connect to the Output of the NOR Gate LED 0 of Digital Trainer KIT.
•Switch On the Digital IC Trainer KIT.
•Apply the various combination of Truth table and verify the output at LED's.
•If output LED glows RED it shows logic HIGH or 1.
•If output LED glows GREEN it shows logic LOW or 0.
•Switch off the Digital Trainer KIT after performing the Experiment.
•Disconnect Output from the LED and note down the corresponding multi-meter voltage reading for various combination of inputs (not required).
Conclusion: - All the output verified the result of Truth Table.
Precaution in lab:-
•All the connections should be tight and proper.
•Handle the ICs carefully.
•Check the connection once again before Switching on the Digital Trainer KIT.
•Switch of the Trainer Kit after performing the Experiment.

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