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.

AND gate truth table and symbol

The logic or Boolean expression for an AND gate is A.B = Q 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.

2-input AND Gate Reality Desk

AND gate symbol
Enter A Enter B Output Q
0 0 0
0 1 0
1 0 0
1 1 1

3-input AND Gate Reality Desk

3-input AND gate symbol
Enter A Enter B Enter C Output Q
0 0 0 0
0 0 1 0
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 1

IC Alternate options with AND Gates

Pinout for the 4081 IC

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.

Simple circuit to test an AND gate

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





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