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Subelement E
Digital Logic
Section 33
Types of Logic
What is the voltage range considered to be valid logic low input in a TTL device operating at 5 volts?
  • 2.0 to 5.5 volts.
  • -2.0 to -5.5 volts.
  • Correct Answer
    Zero to 0.8 volts.
  • 5.2 to 34.8 volts.

It makes sense that zero volts would indicate an off or low state. Since there is margin for error, any voltage between zero and 0.8 volts would also be considered low.

Negative voltages are clearly not an option. The other options don't go down to zero, so they are incorrect.

Last edited by sammylandler. Register to edit

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What is the voltage range considered to be a valid logic high input in a TTL device operating at 5.0 volts?
  • Correct Answer
    2.0 to 5.5 volts.
  • 1.5 to 3.0 volts.
  • 1.0 to 1.5 volts.
  • 5.2 to 34.8 volts.
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What is the common power supply voltage for TTL series integrated circuits?
  • 12 volts.
  • 13.6 volts.
  • 1 volt.
  • Correct Answer
    5 volts.
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TTL inputs left open develop what logic state?
  • Correct Answer
    A high-logic state.
  • A low-logic state.
  • Open inputs on a TTL device are ignored.
  • Random high- and low-logic states.
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Which of the following instruments would be best for checking a TTL logic circuit?
  • VOM.
  • DMM.
  • Continuity tester.
  • Correct Answer
    Logic probe.
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What do the initials TTL stand for?
  • Resistor-transistor logic.
  • Correct Answer
    Transistor-transistor logic.
  • Diode-transistor logic.
  • Emitter-coupled logic.
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