AND gate

AND gate truth table
Input		Output
A	B	A AND B
0	0	0
0	1	0
1	0	0
1	1	1

ANSI AND gate symbol

In digital electronics, an AND gate is a logic gate which produces an output of true when all its inputs are true. A LOW (0) output results when any of the inputs to the gate are LOW; if all of the inputs are HIGH (1), a HIGH output results.

Logic

A two-input AND gate can be expressed in Boolean logic as $A\cdot B$, $A\wedge B$ or $A\And B$.

Alternatives

If a specific type of gate is not available, a circuit that implements the same function can be constructed from other available gates. Through the use of the "universal" NAND gates and NOR gates, almost any other Boolean logic gate can be constructed.

An AND gate can be constructed using two NAND gates or three NOR gates in the following topologies:

An AND gate constructed from two NAND gates

See also

• OR gate
• NAND gate
• NOR gate
• XOR gate
• XNOR gate
• Inverter (NOT gate)
• IMPLY gate
• NIMPLY gate