NOR gate

A logic gate whose output is true only when every input is false. It implements the negation of logical OR.

NOR truth table: A table listing a NOR gate’s output for every possible combination of binary inputs. It makes the gate’s defining all-inputs-false condition explicit.
OR gate: A logic gate whose output is true when at least one input is true. NOR gives the opposite output of OR for every input combination.
SRAM: A volatile semiconductor memory that stores each bit in a bistable circuit, typically using six transistors. Some SRAM cells use cross-coupled NOR gates to store and retain a bit.
AOI logic: Compound logic that performs an AND-OR function followed by inversion in a single circuit. AOI gates combine operations that may otherwise require several NOR or other gates.
Boolean algebra: An algebraic system using true and false values with operations such as AND, OR, and NOT. NOR is the negated OR operation within this algebra.
NOT gate: A logic gate that outputs the logical negation of its single input. NOR combines OR with the inversion performed by a NOT gate.
SR latch: A bistable circuit that stores one bit using set and reset inputs. Two cross-coupled NOR gates form a basic active-high SR latch.
OAI logic: Compound logic that performs an OR-AND function followed by inversion in a single circuit. OAI circuits offer an alternative way to combine inverted logic efficiently.
De Morgan's laws: Identities relating the negation of conjunctions and disjunctions to conjunctions and disjunctions of negations. They express NOR as the AND of individually negated inputs.
AND gate: A logic gate whose output is true only when all its inputs are true. De Morgan’s law makes NOR equivalent to an AND of inverted inputs.

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XNOR gateCompared with: NOR recognizes all-low inputs, whereas XNOR recognizes matching values.