Logic GatesLogic Gates

It’s Only LogicalIt’s Only Logical

Logic GatesLogic Gates

• Are the switches that computers and similar devices use.

• They hold their state until something changes.

• Are the switches that computers and similar devices use.

• They hold their state until something changes.

Several TypesSeveral Types

• And Gate• Or Gate• Nand Gate• Nor Gate• Not Gate• A few others I won’t cover here.

• And Gate• Or Gate• Nand Gate• Nor Gate• Not Gate• A few others I won’t cover here.

And GatesAnd Gates

• Inputs Output

• Both inputs must be on to turn the output on

• Inputs Output

• Both inputs must be on to turn the output on

Or GatesOr Gates

• Inputs Output

• If either input is on the output turns on

• Inputs Output

• If either input is on the output turns on

Nand GatesNand Gates

• Inputs Output

• Stays ON unless both inputs are turned ON, then just to be difficult, it turns it’s output to OFF

• Inputs Output

• Stays ON unless both inputs are turned ON, then just to be difficult, it turns it’s output to OFF

Nor GatesNor Gates

• Inputs Output

• Stays OFF unless both inputs are turned OFF, then just to be different, it turns it’s output ON

• Inputs Output

• Stays OFF unless both inputs are turned OFF, then just to be different, it turns it’s output ON

Not GatesNot Gates

• Input Output

• Whatever the input is, it changes - ON becomes OFF and OFF becomes ON

• Input Output

• Whatever the input is, it changes - ON becomes OFF and OFF becomes ON

Bill GatesBill Gates

• Does whatever he wants to because he can afford it.

• Does whatever he wants to because he can afford it.

For More InformationFor More Information

• http://www.kpsec.freeuk.com/gates.htm• http://www.kpsec.freeuk.com/gates.htm