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#### Digital Logic Gate

 AND Gate        OR Gate        NOT Gate        NAND Gate        NOR Gate        Ex-OR Gate          Ex-NOR Gate

## Logic OR Gate Tutorial

If the two input values are both 0, the output value is 0; instead, the output is 1. #### Two-input OR GATE

An OR gate performs associate degree ORing operation on 2 or over 2 logic variables. The OR operation on 2 freelance logic variables A and B is written as Y =A+B and reads as Y equals A OR B and not as A and B. associate degree OR gate could be a logic circuit with 2 or additional inputs and one output. The output of associate degree OR gate is LOW only all of its inputs square measure LOW. For all alternative potential input combos, the output is HIGH. This statement once understood for a positive logic system means that the subsequent. The output of associate degree OR gate could be a logic ‘0’ only all of its inputs square measure at logic ‘0’. For all alternative potential input combos, the output could be a logic ‘1’. Figure 4.3 shows the circuit image and also the truth table of a two-input OR gate. The operation of a two-input OR gate is explained by the logic expression.

Y=A+B

#### Two-input Transistor OR Gate

A simple 2-input inclusive logic gate may be created victimization RTL Resistor-transistor switches connected along as shown below with the inputs connected on to the semiconductor unit bases. Either semiconductor unit should be saturated “ON” for Associate in Nursing output at Y.

#### Fig-5: 3 input Transistor AND Gate

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#### Fig-6: 3-Input OR gate IC configuration #### Three-input Transistor OR Gate

A simple 3-input inclusive logic gate may be created victimization RTL Resistor-transistor switches connected along as shown below with the inputs connected on to the semiconductor unit bases. Either semiconductor unit should be saturated “ON” for Associate in Nursing output at Y.

#### Commonly available digital logic OR gate IC Number:

TTL Logic AND Gate

74LS32 Quad 2-input IC Pin number 14

HCF4075 Triple 3-input IC Pin number 14

TTL Logic AND Gate

CD4072 Dual 4-input IC Pin number 14

CD4071 Quad 2-input IC Pin number 14

CD4075 Triple 3-input IC Pin number 14

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