|IC Number||IC Name|
|74LS02||Quad 2-input NOR Gates|
NOT GATE - It is a digital circuit that has a single input and single output. The output of NOT gate is the logical inversion of input. Hence, the NOT gate is also called an inverter.
Logic NOT Gates are available using digital circuits to produce the desired logical function. The standard NOT gate is given a symbol whose shape is of a triangle pointing to the right with a circle at its end. This circle is known as an "inversion bubble". Logic NOT gates provide the complement of their input signal and are so called because when their input signal is "HIGH" their output state will NOT be "HIGH". Likewise, when their input signal is "LOW" their output state will NOT be "LOW". As they are single-input devices, logic NOT gates are not normally classed as "decision" making devices
Boolean Expression Y = A'
"If A is true, then Y is false"
This NOT gate produces an output Y, which is the complement of input, A.
NOR GATE - It is a digital circuit that has two or more inputs and produces an output, which is the inversion of logical OR of all those inputs.
Logic NOR Gates are available using digital circuits to produce the desired logical function and is given a symbol whose shape is that of a standard OR gate with a circle, sometimes called an “inversion bubble” at its output to represent the NOT gate symbol with the logical operation of the NOR gate.
As with the OR function, the NOR function can also have any number of individual inputs and commercial available NOR Gate IC’s are available in standard 2, 3, or 4 input types. If additional inputs are required, then the standard NOR gates can be cascaded together to provide more inputs.
Boolean Expression Y = ( A+B)'
"If both A and B are NOT true, then Y is true"
NOR gate operation is same as that of OR gate followed by an inverter. That’s why the NOR gate symbol is represented like that.