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And Gate
This is the basic gate and it implements logical conjunction. The output of the AND gate is high, only if both the inputs are high otherwise both are low.
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Or Gate
The OR gate implements logical disjunction.The output is high if any one of the inputs is high.
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Nand Gate
It is complement of AND gate. The output is low only when both the inputs are high, otherwise it is high.
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Nor Gate
NOR gate is a not OR gate. Output of this gate is high, if both the inputs are Low, otherwise it is High.
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Not Gate
Inverter or NOT gate implements logical negation. This gate inverts the input.
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Exor
This gate implements exclusive OR logic. The output of this gate is high ,if both the inputs are different.
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Exnor
This gate implements negation of EXOR logic. The output of this gate is high , only if the two inputs are identical.
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Buffer
It is an audio signaling device. Generally used in alarms, timers and for confirmation messages.
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Tri-State Buffer
Similar to a normal buffer but with a control signal. In case of active high buffer, it operates normally only when control signal is 1. In case of active low buffer, it operates normally only when control signal is 0.
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Flip Flop
Flip flop is the also
a memory element but this is a synchronous device. The figure below shows the basic D-flip-flop.
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