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Logic Gates

 A digital logic gate is an Integrated Circuit (IC) device that

makes logical decisions based on various combinations of

digital signals presented to it’s inputs.

 Digital logic gates can have more than one input signal,

but generally have a single output signal, just like the

decision box on the previous slide.

 In the following slides, the input digital signals will be

represented by A and/or B and the output digital signal

will be represented by Q.

 The next six slides will demonstrate how the output

digital signal is determined by the input digital signals for

various different digital logic gates (NOT gate, AND gate,

OR gate, NAND gate, NOR gate, XOR gate).

Almost all modern electronics such as computers and cellphones use digital logic circuitry

Digital Logic

Gate

Input Digital

Signals

Output Digital

Signal

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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