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The “reliability” of a logic gate describes its mean time between failure (MTBF). Digital machines often have millions of logic gates. Also, most digital machines are “optimized” to reduce their cost. The result is that often, the failure of a single logic gate will cause a digital machine to stop working.




The cost of a logic gate is crucial, primarily because very many gates are needed to build a computer or other advanced digital system and because the more gates can be used, the more capable and/or fast the machine can be. Since the majority of a digital computer is simply an interconnected network of logic gates.


Modern transistorized integrated circuit logic gates have MTBFs greater than 82 billion hours (8.2×1010) hours, and need them because they have so many logic gates. Fanout describes how many logic inputs can be controlled by a single logic output without exceeding the electrical current ratings of the gate outputs. The earliest integrated circuits were a happy accident.


