OR and AND Gates Experiment

Student Information

Part 1. Objectives

• To verify experimentally the proper operation of an OR gate.
• To verify experimentally the proper operation of an AND gate.

Part 2. Discussion

An OR gate is designed so that an output signal will occur any time there is an input signal. The presence of a signal is represented as logic 1 and the absence of a signal is represented as logic 0. A symbol for a two-input OR gate is shown in figure 1-1a.

An **AND gate** is designed so that an output signal will occur only when there are signals at all inputs.

Part 3. Equipment and parts required:

• 1 quadruple 2 – input OR gate, '32
• 1 triple 3 – input AND gate, '11
• 1 VOM
• 1 regulated power supply, 5V dc

Part 4. Procedure

1. Record here the exact device you are using.
2. Examine the data sheet of the '32 IC and note carefully the required supply and the maximum supply current required. Apply power the OR gates.
3. Using 0 V dc for logic 0 and +5 V dc for logic 1, record the output voltages of the gate for each input combination shown in the table below.

Inputs		Output
A	B
0	0
0	+5
+5	0
+5	+5

Record Actual measured value for:
0: 1:
4. Conduct a 3 - input OR gate from two 2 - input OR gates as shown below. Verify the proper operation by applying the input signal combinations and record the resulting gate output voltages in the table.

Inputs			Output
A	B	C	x
0	0	0
0	0	+5
0	+5	0
0	+5	+5
+5	0	0
+5	0	+5
+5	+5	0
+5	+5	+5

5. Connect one OR gate as a 1 - input unit by typing together all inputs, determine the gate output for each input in the table below.

A	x
0 V dc
+5 V dc

6. Examine the data sheet for the '11 IC noting the required supply voltage Vo and the maximum required supply. Apply power to the AND gate.
7. Using 0 V dc for logic 0 and +5 V de for logic 1, record the output voltages of the gate for each input combination shown in the tables

Input 1	Input 2	Output
0	0
0	+5
+5	0
+5	+5



Inputs			Output
A	B	C	X
0	0	0
0	0	+5
0	+5	0
0	+5	+5
+5	0	0
+5	0	+5
+5	+5	0
+5	+5	+5

Record Actual measured value for:
0: 1:
8. A 4 - input AND gate can be constructed by connecting two 3 - input AND gates as shown below. Verify the proper operation by applying input signals and record the resulting gate output voltage lin the table below.

Inputs				Output
Input A	Input B	Input C	Input D	Output x
0	0	0	0
+5	0	0	0
0	+5	0	0
+5	+5	0	0
0	0	+5	0
+5	0	+5	0
0	+5	+5	0
+5	+5	+5	0
0	0	0	+5
+5	0	0	+5
0	+5	0	+5
+5	+5	0	+5
0	0	+5	+5
+5	0	+5	+5
0	+5	+5	+5
+5	+5	+5	+5

9. Connect one AND gate as a 1 - input gate by typing together all the inputs, determine the gate output and record the results.

A	x
0 V dc
+5 V dc

Part 5. Questions