Digital Electronics-Flips-Flops
Digital Electronics-Flips-Flops
12. On a master-slave flip-flop, when is the master enabled?
- when the gate is LOW
- when the gate is HIGH
- both of the above
- neither of the above
13. One example of the use of an S-R flip-flop is as a(n):
- racer
- astable oscillator
- binary storage register
- transition pulse generator
14. What is the difference between the 7476 and the 74LS76?
- the 7476 is master-slave, the 74LS76 is master-slave
- the 7476 is edge-triggered, the 74LS76 is edge-triggered
- the 7476 is edge-triggered, the 74LS76 is master-slave
- the 7476 is master-slave, the 74LS76 is edge-triggered
15. Which of the following is correct for a gated D flip-flop?
- The output toggles if one of the inputs is held HIGH.
- Only one of the inputs can be HIGH at a time.
- The output complement follows the input when enabled.
- Q output follows the input D when the enable is HIGH.
16. With regard to a D latch, ________.
- the Q output follows the D input when EN is LOW
- the Q output is opposite the D input when EN is LOW
- the Q output follows the D input when EN is HIGH
- 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?
- It can't be done.
- Invert the Q outputs.
- Invert the S-R inputs.
18. When is a flip-flop said to be transparent?
- when the Q output is opposite the input
- when the Q output follows the input
- when you can see through the IC packaging
19. Master-slave J-K flip-flops are called pulse-triggered or level-triggered devices because input data is read during the entire time the clock pulse is at a LOW level.
- TRUE
- FALSE
20. Which of the following is correct for a D latch?
- The output toggles if one of the inputs is held HIGH.
- Q output follows the input D when the enable is HIGH.
- Only one of the inputs can be HIGH at a time.
- The output complement follows the input when enabled.