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# Digital Electronics - Flip-Flops

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### Exercise

"To err is human; to forgive, divine."
- Alexander Pope
13.

One example of the use of an S-R flip-flop is as a(n):

 A. racer B. astable oscillator C. binary storage register D. transition pulse generator

14.

What is the difference between the 7476 and the 74LS76?

 A. the 7476 is master-slave, the 74LS76 is master-slave B. the 7476 is edge-triggered, the 74LS76 is edge-triggered C. the 7476 is edge-triggered, the 74LS76 is master-slave D. the 7476 is master-slave, the 74LS76 is edge-triggered

15.

Which of the following is correct for a gated D flip-flop?

 A. The output toggles if one of the inputs is held HIGH. B. Only one of the inputs can be HIGH at a time. C. The output complement follows the input when enabled. D. Q output follows the input D when the enable is HIGH.

16.

With regard to a D latch, ________.

 A. the Q output follows the D input when EN is LOW B. the Q output is opposite the D input when EN is LOW C. the Q output follows the D input when EN is HIGH D. the Q output is HIGH regardless of EN's input state

17.

How can the cross-coupled NAND flip-flop be made to have active-HIGH S-R inputs?

 A. It can't be done. B. Invert the Q outputs. C. Invert the S-R inputs.

18.

When is a flip-flop said to be transparent?

 A. when the Q output is opposite the input B. when the Q output follows the input C. when you can see through the IC packaging