Verification of Truth Tables of Logic Gates Using Integrated Circuits

VERIFICATION OF TRUTH TABLES OF LOGIC GATES USING INTEGRATED CIRCUITS

AIM

To verify the truth tables of AND, OR, NOT, EX-OR, NAND and NOR gates using integrated circuits

COMPONENTS REQUIRED

AND gate (IC 7408), NOT gate (IC 7404), OR gate (IC 7432),

NAND gate (IC 7400), NOR gate (IC 7402), X-OR gate (IC 7486),

Power supply, Digital IC trainer kit, connecting wires.

BOOLEAN EXPRESSIONS

CIRCUIT DIAGRAM

Pin Identification

Figure (a) Integrated circuit

Note:

The chip must be inserted in the bread board in such a way that the identification mark should be on our left side. In this position, pin numbers are counted as marked in the picture above. Pin identification is the same for all chips that are mentioned below.

PROCEDURE

·        To verify the truth table of a logic gate, the suitable IC is taken and the connections are given using the circuit diagram.

·        For all the ICs, 5V is applied to the pin 14 while the pin 7 is connected to the ground.

·        The logical inputs of the truth table are applied and the corresponding output is noted.

·        Similarly the output is noted for all other combinations of inputs.

·        In this way, the truth table of a logic gate is verified.

RESULT

The truth table of logic gates AND, OR, NOT, Ex-OR, NAND and NOR using integrated circuits is verified.

Precautions

(i) V_CC and ground pins must not be interchanged while making connections. Otherwise the chip will be damaged. (ii) The pin configuration for NOR gate is different from other gates