ESAB Powercut 1600 Service Manual page 169

SECTION 9
10.4 Glossary
SYMBOL
A
B
A
B
A
B
A
B
A X
LOGIC SYMBOLS
NAME
X
AND GATE
X
OR GATE
X
NAND GATE
X
NOR GATE
NOT
(INVERTER)
gENERAl INfORMATION
DESCRIPTION
An AND gate can have two or more inputs. The output of an AND gate is
true when all its inputs are true.
AND
INPUT OUTPUT
A B
0 0
0 1
1 0
1 1
An OR gate can have two or more inputs. The output of an OR gate is
true when at least one of its inputs is true.
OR
INPUT OUTPUT
A B X = A+B
0 0
0 1
1 0
1 1
A NAND gate can have two or more inputs. The 'o' on the output means
'not' showing that it is a Not AND gate. The output of a NAND gate is
true unless all its inputs are true.
NAND
INPUT OUTPUT
X = A B
A B
0 0
0 1
1 0
1 1
A NOR gate can have two or more inputs. The 'o' on the output means
'not' showing that it is a Not OR gate. The output of a NOR gate is true
when none of its inputs are true.
NOR
INPUT OUTPUT
X = A + B
A B
0 0
0 1
1 0
1 1
A NOT gate can only have one input. The 'o' on the output means 'not'.
The output of a NOT gate is the inverse (opposite) of its input, so the
output is true when the input is false. A NOT gate is also called an
inverter.
NOT
INPUT OUTPUT
X = A
A
0 1
1 0
169
X = AB
0
0
0
1
0
1
1
1
1
1
1
0
1
0
0
0
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