Logic gates and logic circuits

Logic gates and logic circuits

1. Electronic circuits in computers, many new memories and controlling devices are made up of thousands of logic gates

   • Logic gates take binary inputs, producing a binary output. Several logic gates combined together form a logic circuit, and these circuits are designed to carry out a specific function. The checking of the output from a logic gate is done using a truth table

2. Truth tables

   • Used to trace output from a logic gate or logic circuit. When constructing truth tables, all possible combinations of 1s and 0s which can be inputted are considered

3. Logic functions

   • NOT - reverses input
   • AND - both inputs have to be 1 to output 1, anything else outputs 0
   • OR - Output is 1 if either input is 1
   • NAND - output is 1 if both inputs aren't 1
   • NOR - Output is 1 if neither input is 1
   • XOR - Output is 1 if both inputs are 1 and 0

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