Digital Logic Gate
Logic OR Gate Tutorial
If the two input values are both 0, the output value is 0; instead, the output is 1.
Fig-1: Logic OR Gate symbol
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
Fig-2: Two-input OR gate
Fig-3: 2 Input OR gate IC configuration
Fig-4: 2-input OR Gate output waveform
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
Three-input OR GATE
Fig-6: 3-Input OR gate IC configuration
Fig-7: 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