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The AND gate - Digital Logic gates

Gates are what make many of ICs, the two popular families are the 40xx CMOS and the 74xx TTL . Now 40xx come in 74HCT40xx flavors which approach the quality of an ideal gate.

Entire circuits with Gates can also be also be burnt into PLDs, FPGAs and CPLDs just like you burn your CDROM. Gates can also be implemented in assembly language which a microcontroller like 8051 will understand and execute. Hardware gate circuit will operate in real time, propagation delay of nano seconds will be there due to parasitic gate capacitance or FET switching times. Software Gates using microcontroller and code will depend on both propagation delay of semiconductor, CPU clock speed and BUS width.

Differential TTL converter

AND Gate Simulation

This gate ANDs the two inputs A and B, The Output is high only if A AND B both are high. There may be a AND gate with many inputs, only if all inputs are high the output will be high.

This page requires images and javascript to be enabled to try out the demo of the gates below.




Toggle the red buttons above to apply a 'high' or 'low' to inputs A and B and watch the output Q.

Truth table

0 0
0 1 0
1 0 0
1 1

The AND gates can be built with diodes and transistors if you want to do it on your own. . More on TTL and CMOS here at Logic Family Voltage Translation.

Interactive Digital Logic Gates Tutor Widget

Interactive Tutor for Learning Digital Logic, Like NOT, AND, OR and XOR.

Crystal Oscillator

These Gadgets helps beginners learn some digital circuit concepts. The Digital Logic is Studied by operating Switches and observing LEDs on a Virtual Breadboard. Lead Free


AND Logic Gate

The Gate is a digital component that is used to compute an output for certain inputs, the inputs and outputs have two states high-1 and low- 0. Let us assume high is 5V and low is 0V (like in CMOS). On a high level the LED will light up and on a low level the LED is off. Now let us see what Logic means.