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# Alternative Logic Gate

Welcome to Class !!

In today’s Computer Science class, We will be learning about Alternative Logic Gates. We hope you enjoy the class!

Logic gates are the basic building blocks of any digital circuit.

Logic gates are classified as-

### Alternative Logic Gates-

 An alternative logic gate is an alternate logic gate that produces the same output as the original logic gate and can be used during the unavailability of the original logic gate to serve the same purpose.

Alternative logic gates are also called as Alternate Gates.

Alternative logic gates are also called as Bubbled Gates since they contain bubbles in them.

The following table shows the original logic gate and its corresponding alternate gate-

### Rules To Memorize Alternative Logic Gates-

The following rules are helpful in drawing an alternate logic gate for a given logic gate-

##### For AND, NAND, OR & NOR Gates-
• Both the inputs of the alternative gate will have bubbles (which represents NOT gate).
• For AND structured original gate, the alternative gate will be OR structured.
• For OR structured original gate, the alternative gate will be AND structured.
• If a bubble is present at the output of the original gate, then no bubble will be present at the output of the alternative gate.
• If a bubble is not present at the output of original gate, then a bubble will be present at the output of the alternative gate.

##### For EX-OR & EX-NOR Gates-
• One of the inputs of the alternative gate will have a bubble (which represents NOT gate).
• For the EX-OR structured original gate, the alternative gate will be EX-NOR structured.
• For the EX-NOR structured original gate, the alternative gate will be EX-OR structured.
• If a bubble is present at the output of the original gate, then no bubble will be present at the output of the alternative gate.
• If a bubble is not present at the output of the original gate, then a bubble will be present at the output of the alternative gate.

We have come to the end of this class. We do hope you enjoyed the class?

Should you have any further question, feel free to ask in the comment section below and trust us to respond as soon as possible.

We have come to the end of this term. It’s been a remarkable journey and we are glad that you have made it this far. For making it this far, we commend you for being resilient, you have taken charge of your education and future.

The Journey still continues though, we are moving on to Second Term. we hope to meet you there.

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