|IC Number||IC Name|
|74LS27||Triple 3-input NOR Gates|
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+C)'
"If A and B and C 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.