Logic Gates

Define Logic Gates

How the computer makes decisions based on the value it receives

What type of operators do Logic Gates use?

Boolean Operators

Define the Logic Gate Values

1 = True = on

0 = False = off

Define Truth Table

Represent all the possible calculations for a logic gate

Define Logic Circuit

Many logic gates connected

Name this Logic Gate

AND Gate

How many inputs and outputs do AND gates have?

2 inputs

1 output

Define This Expression
AND Gates

Q = A AND B

Define AND Gate

• Both inputs TRUE

• TRUE output

Finish this Truth Table

AND Gate

a - 0

b - 0

c - 0

d - 1

Name this Logic Gate

OR Gate

How many inputs and outputs do OR gates have?

2 inputs

1 output

Define This Expression
OR Gates

Q = A OR B

Define OR Gate

• Either inputs TRUE

• TRUE output

Finish this Truth Table

OR Gate

a - 0

b - 1

c - 1

d - 1

Name this Logic Gate

NOT Gate

How many inputs and outputs do NOT gates have?

1 input

1 output

Define This Expression
NOT Gate

Q = NOT A

Define NOT Gate

• Both inputs FALSE

• TRUE output

Finish this Truth Table

NOT Gate

a - 1

b - 0

Name this Logic Gate

NAND Gate

How many inputs and outputs do NAND gates have?

2 inputs

1 output

Define This Expression
NAND Gate

Q = A Not AND B

Define NAND Gate

• TRUE output

• Except when both inputs are TRUE

Finish this Truth Table

NAND Gate

a - 1

b - 1

c - 1

d - 0

Name this Logic Gate

NOR Gate

How many inputs and outputs do NOR gates have?

2 inputs

1 output

Define NOR Gate

• FALSE Output

• Except when both inputs are FALSE

Finish this Truth Table

NOR Gate

a - 1

b - 0

c - 0

d - 0

Name this Logic Gate

XOR Gate

How many inputs and outputs do XOR gates have?

2 inputs

1 output

Define XOR Gate

• 2 different inputs

• TRUE output

Finish this Truth Table

XOR Gate

a - 0

b - 1

c - 1

d - 0

Express this Logic Circuit

P = (A AND B) OR C