Easy
EST. TIME: 45 minStudy and Verification of Logic Gates
To design and verify the truth tables of basic logic gates (AND, OR, NOT, NAND, NOR, XOR, XNOR) using 74xx family ICs.
Theory
Logic Gates are the fundamental building blocks of digital circuits. They perform basic logical operations.
- AND Gate (7408): Output is HIGH only if all inputs are HIGH.
- OR Gate (7432): Output is HIGH if at least one input is HIGH.
- NOT Gate (7404): Output is the complement of the input.
- NAND Gate (7400): Compliment of AND. Universal gate.
- NOR Gate (7402): Compliment of OR. Universal gate.
- XOR Gate (7486): Output is HIGH if inputs are different.
- XNOR Gate (74266): Output is HIGH if inputs are same.
Procedure
- Select the desired logic gate from the component toolbar.
- Connect input switches to the gate inputs.
- Connect the gate output to an LED or Output probe.
- Toggle the switches to apply different input combinations (0 and 1).
- Observe the output and verify based on the truth table.