# Digital Electronics - Logic Families and Their Characteristics

### Exercise :: Logic Families and Their Characteristics - General Questions

11.

What is the difference between the 54XX and 74XX series of TTL logic gates?

 A. 54XX is faster. B. 54XX is slower. C. 54XX has a wider power supply and expanded temperature range. D. 54XX has a narrower power supply and contracted temperature range.

Explanation:

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12.

An open collector output can ________ current, but it cannot ________.

 A. sink, source current B. source, sink current C. sink, source voltage D. source, sink voltage

Explanation:

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13.

Why is a decoupling capacitor needed for TTL ICs and where should it be connected?

 A. to block dc, connect to input pins B. to reduce noise, connect to input pins C. to reduce the effects of noise, connect between power supply and ground

Explanation:

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14.

Using the schematic diagram of a TTL NAND gate, determine the state of each transistor (ON or OFF) when all inputs are high.

 A. Q1-ON, Q2-OFF, Q3-ON, Q4-OFF B. Q1-ON, Q2-ON, Q3-OFF, Q4-OFF C. Q1-OFF, Q2-OFF, Q3-ON, Q4-ON D. Q1-OFF, Q2-ON, Q3-OFF, Q4-ON

Explanation:

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15.

If all inputs to a TTL NAND gate are low, what is the ON, OFF condition of each transistor in the circuit?

 A. Q1-ON, Q2-OFF, Q3-ON, Q4-OFF B. Q1-ON, Q2-ON, Q3-OFF, Q4-OFF C. Q1-OFF, Q2-OFF, Q3-ON, Q4-ON D. Q1-OFF, Q2-ON, Q3-OFF, Q4-ON