# AND Gate – Logic Gates Tutorial

An AND gate is a logic gate the place the output goes HIGH (or “1”) provided that all its inputs are HIGH. So if the inputs A AND B are HIGH, the output Q may even be HIGH.

The logic or Boolean expression for an AND gate is which implies that:

If A and B are true, then Q is true

## Reality Desk

AND gates can have greater than two inputs. However regardless of what number of inputs it has, it can solely give out a HIGH or logic “1” if all its inputs are HIGH. As quickly as one of many inputs goes LOW, the output goes LOW too.

## IC Alternate options with AND Gates

If you wish to experiment and construct circuits with AND gates, you’ll discover them in each the 4000 IC collection and the 7400 IC collection:

• 4081: 4 2-input AND gates
• 4073: Three 3-input AND gates
• 74HC08: 4 2-input AND gates (HC is the household, can be LS/HCT/…)
• 74HC09: 4 2-input AND gates (HC is the household, can be LS/HCT/…)
• 74HC11: Three 3-input AND gates (HC is the household, can be LS/HCT/…)

These ought to all be obtainable as hobbyist-friendly through-hole chips. Simply ensure you purchase the DIP package deal model.

## Instance Circuit: Testing the AND gate

Under is a circuit which you could construct to reveal how an AND gate works.

Usually, each inputs to the AND gate are LOW due to the pull-down resistors. While you push any of the push buttons, you’ll make the enter pin HIGH.

The Gentle-Emitting Diode (LED) on the output reveals the end result. A lit LED represents a HIGH output. An unlit LED represents a LOW output. As you’ll see, the LED will solely activate should you push each buttons on the similar time.

## Subsequent Step within the Logic Gates Tutorial

Try the opposite articles on this logic gates tutorial:

NOT Gate/Inverter
AND Gate – (You’re right here)
NAND Gate
OR Gate
NOR Gate
XOR Gate
XNOR Gate

Again to the Logic Gates Overview