These IC's are small building blocks with typical 4 logic gates or 2 flip-flops in a 14 to 16 pin plastic housing. To get a working calculator you need more than 50 of them. From that starting point the calculator race created every year new integrated circuits with higher complexity following the Law of Moore. Working at another supplier of integrated circuits, the well known company Intel, Moore stated: Every three years the complexity of integrated circuits will double. The law is proved, within 30 years the complexity reached more than a million of transistors per integrated circuit. In the meantime Texas Instruments stopped the production of integrated circuits for calculators.
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Meaning it has four OR gate IC inside it, each of which can be utilized independently. Logic level gates like CD and flip-flops play a vital role in digital electronics.
If you are looking for an IC to perform logic level OR operation with two inputs, then this IC might be the right choice for you. If you have more than two inputs for your OR gate then you should look into three input and four input OR gates. The logic OR operation is very simple, since this is a two input OR gate we will have only two inputs which is A and B respectively. The output of the OR gate is called as Q.
The truth table for the OR gate is shown below. As per the truth table shown above, when either one or both the input of the Gate is high the output will be high. The input for the gate is controlled by using a switch connected to pin A and B of the Gate. A pull down resistor of k is used to hold the logic to low logic 0 when the switch is left floating. To visualize the output we have connected a LED to the output pin Q.
The resistor R is used to limit the current through the LED. Subscribe to stay updated with industry's latest Electronics components and news. Component Datasheet. Tags Logic Gates. Get Our Weekly Newsletter!
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