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# Digital Electronics - Signals and Switches

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### Exercise

"Everyone is wise until he speaks."
- (Proverb)
1.

Why does the TTL family use a totem-pole circuit on the output?

 A. It provides active pull-up. B. It provides active pull-down. C. It provides active pull-up and active pull-down.

2.

What is the frequency of a clock waveform if the period of that waveform is
1.25 s?

 A. 8 kHz B. 0.8 kHz C. 0.8 MHz D. 8 MHz

3.

Why is the given circuit called an inverter?

 A. The output is the opposite (inverse) of the input. B. The output is in phase with the input. C. The output is the same as the input. D. There is no output.

4.

The hexadecimal number 4B16 is transmitted as an 8-bit word in parallel. What is the time required for this transmission if the clock frequency is 2.25 MHz?

 A. 444 ns B. 444 s C. 3.55 s D. 3.55 ms

5.

Internally, a computer's binary data are almost always transmitted on parallel channels, commonly referred to as the:

 A. parallel bus B. serial bus C. data bus D. memory bus