EXPERIMENT NO: 01
OBJECT:- To verify the truth table
OR through diodes.
oflogic gates
and realization of AND&
APPARATUS REQUIRED:
IC-7400,
IC-7402,
IC-7404,
-IC-7408,
IC-7432,J
IC-7486,
Hook-up wires,
Power supply,
Diodes &
Resistor.
THEORY:
A logicgate is an
elementary building block of a
digitat eireuit-
gates have two inputS and Most togic
one output. At any given moment,
is in one of the two every termina!
binary conditionslow (0) or
high (1), represented by
differentvoltage levels.
AND GATE -
The AND gate is so named because, if 0 iscalled "false" and 1 is calied
"true," the gate acts in the same way as the logical "and" operator. The
following illustration and table show the circuit symbol and logic
combinations for an AND gate.The output is "true" when both inputs are
"true." Otherwise, the output is "false".
LOGIC SYMBOL
ABLE FO AND GATE
Ope
AND GATE USING DIODE
Rk
IC 7408
Vee
7408
2
2
OR GATE -The OR gate gets its name from
thefact that it behaves after
fashionof the logical
inclusive "or." The output is "true"
te
the inputs are "true." If both if either or both of
inputs are "false," then the
output is "false.
LOGIC SYMBOL
TRUTH TABLE FOR OR GATE
Input
Output
A B
1 1
1 1
1 1 1
OR GATE USING DIODE
B
Out
IC7432
7432
NOT GATE -A logical inverter sometimes called a NOT gate to
differentiate it from other types of electronic inverter devices, has only one
input. It reverses the logic state.
TRUTH TABLE FOR NOT GATE
Input Output
A Y
1
Ly
IC 7400
7400
23 LA 6
NOR GATE-The NOR gate is a combination OR gate followed by an
inverter. Its output is "true" if both inputs are "false."Otherwise, the output
"
is "false.
LOGIC SYMBOL
TRUTH TABLE FOR NOR GATE
Input Output
A B Y
1
. 0
1
0
1
1 1 0
IC7402
7402
Ex-OR GATE-The XOR (exclusive-OR ) gate acts in the same way as the
logical "either/or." The output is "true"if either, but not both, of the inputs
are "true."The output is "false" if both inputs are "false"or if both inputs are
"true." Another way of looking at this circuit is to observe that the output is
1 if the inputs are different,but 0 if the inputs are the same.
LOGIC SYMBOL
TRUTH TABLE FOR Ex-OR GATE
input
Output
A B Y
0
1 1
1 1
1 1 0
IC7486
7486
PROCEDURE:
data sheet of all the IC.
1. Look at the
2. Place the IC on the Bread board properly.
to the pins specified by the
data
3. Connectthe Vcc & gound
sheet.
4. Do all the connection as per the diagram.
5. Switch ON the power supply.
observe the output &
6. After completing the connection properly,
match it with the given truth table.
has been verified successfully.
RESULT:- The result of the
experiment
PRECAUTION:
1. All the connections should be proper according to the circuit
diagram.
2. Handle the ICs carefully.
3. In case of any fluctuation or burning smell switch OFF the
power supply immediately.
8/8
