TTL
PrintTTL, or transistor-transistor logic, is a communication protocol that defines the logic levels that a signal can have.
TTL is one of many ways to represent digital signals. In TTL, signals are presented from zero to five volts. A logic low is any value between 0.0 volts and 0.8 volts. A logic high is any value between 3.3 volts and 5.0 volts.
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