OR Gate (MA168E)

The output of an OR gate is high IF either input, A or B, or both, are in the high logic level. Figure 1 shows the symbol and the equivalent circuits.

 

Figure 1
Figure 1

 

 

Equation 1

2-Input OR gate

X = A + B

 

Where:

X is the input logic level

A and B are the output logic levels

 

Equation 2

3-Input OR Gate

X – A + B + C

 

Where:

X is the input logic level

A, B and C are the output logic levels

 

Truth Table


 

Circuit Bench