74LS32 PDF

June Revised March Quad 2-Input OR Gate. General Description.

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OR gate is a digital logic gate, designed for arithmetic and logical operations. This gate is mainly used in applications where there is a need for mathematical calculations. Here we are going to use 74LS32 chip for demonstration, this chip has 4 OR gates in it. These four gate are connected internally as shown in below figure.

These gates have limitations for working voltage and input logic frequency. In any other case the output should be HIGH. And then the inputs are connected to power through a button. So with two buttons we can realize the truth table of OR gate. When one of button is pressed one input of gate will be high and other will be low at this time the output should be HIGH. These pull down resistors are necessary as the chosen Integrated Circuit is a positive edge triggering one.

If the resistors are ignored the circuit might generate unpredictable results. The capacitors here are for neutralizing the bouncing effect of buttons. Although the capacitors here are not compulsory, putting them might smooth the working of gate.

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