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Element 3: General Radiotelephone

effective 6/25/2009

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3-E-033: Types of Logic

3-33E1: What is the voltage range considered to be valid logic low input in a TTL device operating at 5 volts?

Zero to 0.8 volts.

2.0 to 5.5 volts.

-2.0 to -5.5 volts.

5.2 to 34.8 volts.



3-33E2: What is the voltage range considered to be a valid logic high input in a TTL device operating at 5.0 volts?

2.0 to 5.5 volts.

1.5 to 3.0 volts.

1.0 to 1.5 volts.

5.2 to 34.8 volts.



3-33E3: What is the common power supply voltage for TTL series integrated circuits?

5 volts.

12 volts.

13.6 volts.

1 volt.



3-33E4: TTL inputs left open develop what logic state?

A high-logic state.

A low-logic state.

Open inputs on a TTL device are ignored.

Random high- and low-logic states.



3-33E5: Which of the following instruments would be best for checking a TTL logic circuit?

Logic probe.

VOM.

DMM.

Continuity tester.



3-33E6: What do the initials TTL stand for?

Transistor-transistor logic.

Resistor-transistor logic.

Diode-transistor logic.

Emitter-coupled logic.





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