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논리 게이트 심벌

흰군 2011. 3. 22. 16:14

NOT gate (inverter)

The output Q is true when the input A is NOT true, the output is the inverse of the input: Q = NOT A
A NOT gate can only have one input. A NOT gate is also called an inverter.
traditional NOT gate symbol IEC NOT gate symbol
Input A Output Q
0 1
1 0
Traditional symbol IEC symbol Truth Table

AND gate

The output Q is true if input A AND input B are both true: Q = A AND B
An AND gate can have two or more inputs, its output is true if all inputs are true.
traditional AND gate symbol IEC AND gate symbol
Input A Input B Output Q
0 0 0
0 1 0
1 0 0
1 1 1
Traditional symbol IEC symbol Truth Table

NAND gate (NAND = Not AND)

This is an AND gate with the output inverted, as shown by the 'o' on the output.
The output is true if input A AND input B are NOT both true: Q = NOT (A AND B)
A NAND gate can have two or more inputs, its output is true if NOT all inputs are true.
traditional NAND gate symbol IEC NAND gate symbol
Input A Input B Output Q
0 0 1
0 1 1
1 0 1
1 1 0
Traditional symbol IEC symbol Truth Table

OR gate

The output Q is true if input A OR input B is true (or both of them are true): Q = A OR B
An OR gate can have two or more inputs, its output is true if at least one input is true.
traditional OR gate symbol IEC OR gate symbol
Input A Input B Output Q
0 0 0
0 1 1
1 0 1
1 1 1
Traditional symbol IEC symbol Truth Table

NOR gate (NOR = Not OR)

This is an OR gate with the output inverted, as shown by the 'o' on the output.
The output Q is true if NOT inputs A OR B are true: Q = NOT (A OR B)
A NOR gate can have two or more inputs, its output is true if no inputs are true.
traditional NOR gate symbol IEC NOR gate symbol
Input A Input B Output Q
0 0 1
0 1 0
1 0 0
1 1 0
Traditional symbol IEC symbol Truth Table

EX-OR (EXclusive-OR) gate

The output Q is true if either input A is true OR input B is true, but not when both of them are true: Q = (A AND NOT B) OR (B AND NOT A)
This is like an OR gate but excluding both inputs being true.
The output is true if inputs A and B are DIFFERENT.
EX-OR gates can only have 2 inputs.
traditional EX-OR gate symbol IEC EX-OR gate symbol
Input A Input B Output Q
0 0 0
0 1 1
1 0 1
1 1 0
Traditional symbol IEC symbol Truth Table

EX-NOR (EXclusive-NOR) gate

This is an EX-OR gate with the output inverted, as shown by the 'o' on the output.
The output Q is true if inputs A and B are the SAME (both true or both false): Q = (A AND B) OR (NOT A AND NOT B)
EX-NOR gates can only have 2 inputs.
traditional EX-NOR gate symbol IEC EX-NOR gate symbol
Input A Input B Output Q
0 0 1
0 1 0
1 0 0
1 1 1
Traditional symbol IEC symbol Truth Table

출처 - http://www.kpsec.freeuk.com/gates.htm
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