1. The NOR Gate
NOR used as a universal gate
(can be used in combination to perform
AND,OR,
and inverter operation).
NOR is contraction to NOT OR
(AND with inverted input).
NOR gate produces a LOW (0)
output when any of the
inputs are HIGH (1)

2. The NOR Truth Table
 The Boolean expression X = A + B
 Negative-AND equivalent A B X
operation of the NOR gate
 Ex. Airplane landing gears O O 1
0 1 0
1 0 0
X=A+B
1 1 0

3. The Exclusive-OR Gate
 The output of an Exclusive-OR (XOR)
gate is HIGH (1)only when the two
inputs are opposite logic level.