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The OR gate - Digital Logic gates


Gates can be combined to make combinational or sequential logic circuits. combinational circuits are a complex network of gates interconnected to evaluate a pattern of output for patterns of input.

Sequential circuits use memory elements, hence output patterns depend both on input patterns and the memory of history of events. An example of combinational logic circuit is a seven segment display decoder CD4511 and and example for a sequential logic circuit is CD4029 up-down counter.

Usage of Schmitt trigger NAND Gate

OR Gate Simulation

This gate ORs the two inputs A and B, The Output is high if either A OR B is high. There may be a OR gate with many inputs, if one or more inputs are high then the output will be high. AND and OR gates can be wired with Diode logic.

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


A

Q

B

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

Truth table

A B Q
0
0 0
0 1 1
1 0 1
1
1 1


Interactive Digital Logic Gates Tutor Widget

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

OR gate with two 555

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

Screenshot

OR 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.