EED2003 Logic Design - 2021 Fall
Experiment 3
Experiment 3
1
OBJECTIVE
Half subtractor and full adder
Equipment available in the lab
Adjustable power supply
Equipment ensured by the students
Breadboard
Multimeter (measure current, voltage, resistance)
Patch wires
Components
– 7400 NAND Gate
– 7402 NOR Gate
– Switch
– LED
– 330⌦
2
PRELIMINARY WORK
2.1
Part 1
1. Determine the each output state for given input states to implement half subtractor application and fill in Table 1
A
B
0
0
0
1
1
0
1
1
Di↵erence
Barrow
Table 1: Truth table of the half subtractor
2. Obtain simplified Boolean function for each output using Karnough map
3. Arrange the output expressions using NAND gate only.
4. Draw the NAND gate implementation of the half subtractor circuit.
1
Res. Asst. Sebnem SECKIN UGURLU
EED2003 Logic Design - 2021 Fall
2.2
Experiment 3
Part 2
1. Determine the each output state for given input states to implement full adder application
and fill in Table 2.
A
B
Carryin
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Sum
Carryout
Table 2: Truth table of full adder
2. Obtain simplified Boolean function for each output using Karnough map
3. Arrange the output expressions using NOR gate only.
4. Draw the NOR gate implementation of the full adder circuit.
3
PROCEDURE
3.1
Part 1
1. All connections should be made with the power supply in the o↵ position.
2. Construct the half subtractor circuit designed in your preliminary work with NAND gates
only.
3. Do not forget to supply 5V and ground to the ICs.
4. Turn the power on and observe the output of the circuit. Apply all input combinations
and fill the result in Table 3.
2
Res. Asst. Sebnem SECKIN UGURLU
EED2003 Logic Design - 2021 Fall
Experiment 3
A
B
0
0
0
1
1
0
1
1
Di↵erence
Barrow
Table 3: Truth table of the implemented half subtractor
3.2
Part 2
1. All connections should be made with the power supply in the o↵ position.
2. Construct the full adder circuit designed in your preliminary work with NOR gates only.
3. Do not forget to supply 5V and ground to the ICs.
4. Turn the power on and observe the output of the circuit. Apply all input combinations
and fill the result in Table 4.
A
B
Carryin
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Sum
Carryout
Table 4: Truth table of the implemented full adder circuit
3
Res. Asst. Sebnem SECKIN UGURLU