74LS04 DATASHEET PDF

Choose the appropriate package depending on requirement. The description for each pin is given below. The chip is basically used where a logic inverter is needed. Inverter Gates in this chip provide output which is negated logic input.

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Inverter in logic converters is an electronics device whose basic functions are to invert the incoming logic weather it is HIGH or LOW.

They are also known as NOT gates. They have only one input and one output. The basic function of transistors is to give the opposite output with respect to input signals. The basic circuit of the NOT gate by use of transistor design is larger in size which is complex and costly as compared to other solutions.

The 74LS04 comes up with six internal inverters. Every inverter uses a single power supply and it can be used individually like each other. The inverter IC comes up in multiple packages, which make its usage in multiple devices. The IC is cheaper and smaller in size.

NOT gate is designed by transistors and resistors. The transistor act as a switch and resistor use to change the max current flow. The transistor will be attached to the power supply and resistor. The base of the transistor will act as input and emitter will act as output. Here is the circuit. There will be two conditions in which the circuit will operate. Lowering of Voltages will give the LOW state. On the other hand, when we will give the input LOW on the transistor then the transistor will not work.

This will allow the power supply to give the full voltages on the output pin. No matter how the inverter is designed. It will always give the output according to the following pattern. The input will always follow the following truth table on different inputs. The combination of NOT gates cannot make any other gate but a single NOT gate can make other gates by combining with it. Whenever we use even no of NOT gates in series then there will be no effect on output. The even number of NOT gates will cancel out each other effect.

The only odd number will let the change only, even its 1,3 or 5. We will prove this condition in proteus. First, connect the NOT gate with the logic state then check the states it will operate according to the above truth table.

Now we will use two NOT gates in series and will analyze the output. You can see in the image that there is no effect on the output when we apply any input when we connect three 74ls04 NOT gates in series. Then connect the odd no of gates and see the result. The odd no of gates will act as the same as the single gate does.

The series connection will not have any effect on the circuit individually but whenever we want to change the state of single inputs in any other gate than we could connect NOT gate to at the input. Some time multiple NOT gate also used to make proper logic for the circuit. So, we always need to remember whenever the multiple NOT gate will affect the circuit when they are in series with the same wire. If multiple NOT gates attached with the same wire then we can remove them because if they are even in number then remove all of them otherwise use only one, which will minimize the circuit cost and size.

Notify me of follow-up comments by email. Notify me of new posts by email. Table of Contents. Pin 14 will use as the power pin. It will use to provide the power to the IC, to make it functional.

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Datasheet: 74LS04

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