Introduction and Verification of Logic Gates
To study two inputs basic gates such as NOR, NAND ,EX-OR, using TTL and IC and Verify the truth tables.
Name of Components/Apparatus
DC regulated Power supply (0-5V)
NOR Gate 7402
NAND Gate 7400
EXOR Gate 7486
1. Fit the IC on the bread board
2. Switch on the power supply.
3. Inputs are given to the IC Input pins as per the schematic diagram and outputs are observed and tabulated for various logic gates.
4. 5V DC is set as 1 and 0 volt is 0.The inputs are mentioned as A and B.
5. Switch off the supply and remove the connections
1. NOR GATE
It is a combination of NOT and OR gate and the operation of NOR gate is inverse of the OR gate.
1. Boolean equation for NOR gate is Y = A+B
2. If both the inputs of A or B = 0 then the O/P of Y = 1.
3. We can verify the operation by the truth tables and also by glowing of LED.
4. If the I/p is low then the o/p will be high.
5. Operation of the NOR gate is verified from the truth table.
NOR GATE CIRCUIT DIAGRAM
NOR GATE PIN DIAGRAM OF IC - 7402
NAND GATE LOGIC SYMBOL
NAND GATE CIRCUIT DIAGRAM
IC 7400 PIN DIAGRAM: NAND GATE
EX - OR GATE LOGIC SYMBOL
CIRCUIT DIAGRAM EX - OR GATE
IC 7486 PIN DIAGRAM OF EX - OR GATE
Combination of nor and AND gate is called NAND gate It is a Reverse operation of
1. Boolean equation of NAND gate is Y = AB
2. Inputs of A, B is O (or) any one of the input is one and another is 0 means the o/p
will be 1.
3. Operation of the NAND gate is verified from the truth table
EX - OR GATE
i) Diagram of Ex - OR gate shown using IC7486
ii) Boolean equation for Ex- or gate Y= A + B = AB + AB
iii) Any one of the I/P is high mean o/p will be high.
iv) It is verified from the truth table
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