Logic Gates

AND gateProduces an output only if both inputs are on

Input A Input B Output (Q)

0 0

0 1

1 0

1 1Q=

Can you draw a circuit that would act like an AND gate?

OR Gate

Produces an output when….

Input A Input B Output (Q)

0 0

0 1

1 0

1 1Q=

Can you draw a circuit that would act like an OR gate?

NOT Gate

• A NOT gate inverts its input

Input (A) Output (Q)

0

1

Q=A

Can you draw a circuit that would act like an NOT gate?

NOT AND = NAND

Input A Input B A.B Output (Q)=A.B

0 0

0 1

1 0

1 1

Can you draw a circuit that would act like an NAND gate?

NOT OR =NOR

Input A Input B A+B Output (Q) A+B

0 0

0 1

1 0

1 1

Can you draw a circuit that would act like an NOR gate?

XOR – Exclusive OR

Input A Input B Output (Q)

0 0

0 1

1 0

1 1

Q=A + B =A.B+A.B

How would we actually make a logic gate

NOT Gate

AND Gate