DATASHEET 74LS02 PDF

The chip is available in different packages and is chosen depending on requirement. The description for each pin is given below. The chipis basically used when NOR logic function is required. The chip has four NOR gates in it. We can use one or all gates.

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It provides us with compact design and multiple packages of the same IC. Here we will discuss 74LS IT comes up with 4 internal NOR gate. IC comes up in multiple packages with 14 pins and 2 inputs 4-NOR gates. NOR gate is designed with advanced technology based on silicon. The IC is functional with all other 74LS logic family and it can be operating with any microcontroller or IC due to its low output compatibility.

Most of the devices come up with 74LS02 due to its cheapness and fast speed. This IC also comes up with internal protection from discharge using clamp diodes, which keep it protected from any internal voltage leakage activity. NOR gate use in multiple functions but to understand it working we have to understand its structure. The combinations of both gates use five transistors 4 resistors and two diodes.

The diodes are used to control the one side current flow and transistors and resistors are used as switching. The first two transistors are attached to further transistors each, which gives the output to another transistor. That makes a total of three transistors for a single input. First, two-transistor do not have any effect on the other until they attach to the third transistor.

The transistor will work as an inverter or not gate. This whole combination will make the circuit of the NOR gate.

The IC 74LS02 will need only two power to get in the working state. Just apply power then connect it with any TTL device start using it. Every single gate will follow the following truth table. NOR gate can be used to convert Into other gates. First, we will convert the nor gate to NOT gate. The give the input and check the output according to the given instructions. Now we will do the same with the other four gates.

Just apply the input 1 and 0. Here you may notice that OR gate is fully easy to work will like other gates. In proteus, the symbols are different for some device for better understanding but their functionality is the same. The Size of IC may be small in real but their speed of work will always be better more than its size. Download datasheet. Notify me of follow-up comments by email. Notify me of new posts by email.

Table of Contents. Its state will affect the output of first NOR gate. Pin 5 is an input pin. Pin 7 will be used as the common ground by all the devices and power supply used with the IC to make the ground common.

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