---
Status: Ready
Created by: Trude EH
tags:
  - computer-science
  - electronics
  - notes
author: TrudeEH
draft: false
searchHidden: false
showToc: true
title: Logic Gates
---

## NOT

Invert the input.  
![[image42.png]]

### Truth Table

|**Input**|**Output**|
|---|---|
|0|1|
|1|0|

## AND

Output `1` only when both inputs are `1`.  
![[image43.png]]

### Truth Table

|A|**B**|**Output**|
|---|---|---|
|0|0|0|
|0|1|0|
|1|0|0|
|1|1|1|

## OR

Output `1` if at least one input is `1`.  
![[image44.png]]

### Truth Table

|A|**B**|**Output**|
|---|---|---|
|0|0|0|
|0|1|1|
|1|0|1|
|1|1|1|

## NAND

An `AND` gate followed by a `NOT` gate.  
![[image45.png]]

### Truth Table

|A|**B**|**Output**|
|---|---|---|
|0|0|1|
|0|1|1|
|1|0|1|
|1|1|0|

## NOR

An `OR` gate followed by a `NOT` gate.  
![[image46.png]]

### Truth Table

|A|**B**|**Output**|
|---|---|---|
|0|0|1|
|0|1|0|
|1|0|0|
|1|1|0|

## XOR

Either input is `1`, exclusively.  
![[image47.png]]  
![[image48.png]]

### Truth Table

|A|**B**|**Output**|
|---|---|---|
|0|0|0|
|0|1|1|
|1|0|1|
|1|1|0|

## XNOR

Inverted `XOR`.  
![[image49.png]]

### Truth Table

|A|**B**|**Output**|
|---|---|---|
|0|0|1|
|0|1|0|
|1|0|0|
|1|1|1|

## Implementation Examples

### NOT

![[image50.png]]

### AND

![[image51.png]]  
![[image52.png]]

### OR

![[image53.png]]