|IC Number||IC Name|
|74LS21||Dual 4-Input AND Gates|
AND GATE - It is a digital circuit that has two or more inputs and produces an output, which is the logical AND of all those inputs. It is optional to represent the Logical AND with the symbol ‘.’
Logic AND Gates are available using digital circuits to produce the desired logical function and is given a symbol whose shape represents the logical operation of the AND gate. Because the Boolean expression for the logic AND function is defined as (.), which is a binary operation, AND gates can be cascaded together to form any number of individual inputs. However, commercial available AND gate IC’s are only available in standard 2, 3, or 4-input packages. If additional inputs are required, then standard AND gates will need to be cascaded together to obtain the required output value.
Boolean Expression Y = A.B.C.D
"If A and B and C and C are true, then Y is true"
This AND gate produces an output Y, which is the logical AND of inputs A, B, C, D.