Key Topic 33: Types of Logic

Question 1

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

A. 2.0 to 5.5 volts.
B. -2.0 to -5.5 volts.
C. Zero to 0.8 volts.
D. 5.2 to 34.8 volts.

Answer 1

C. Zero to 0.8 volts.

Question 2

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

A. 2.0 to 5.5 volts.
B. 1.5 to 3.0 volts.
C. 1.0 to 1.5 volts.
D. 5.2 to 34.8 volts.

Answer 2

A. 2.0 to 5.5 volts.

Question 3

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

A. 12 volts.
B. 13.6 volts.
C. 1 volt.
D. 5 volts.

Answer 3

D. 5 volts.

Question 4

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

A. A high-logic state.
B. A low-logic state.
C. Open inputs on a TTL device are ignored.
D. Random high- and low-logic states.

Answer 4

A. A high-logic state.

Question 5

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

A. VOM.
B. DMM.
C. Continuity tester.
D. Logic probe.

Answer 5

D. Logic probe.

Question 6

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

A. Resistor-transistor logic.
B. Transistor-transistor logic.
C. Diode-transistor logic.
D. Emitter-coupled logic.

Answer 6

B. Transistor-transistor logic.