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- Question
Why is the fan-out of CMOS gates frequency dependent?
Options- A. Each CMOS input gate has a specific propagation time and this limits the number of different gates that can be connected to the output of a CMOS gate.
- B. When the frequency reaches the critical value, the gate will only be capable of delivering 70% of the normal output voltage and consequently the output power will be one-half of normal; this defines the upper operating frequency.
- C. The higher the number of gates attached to the output, the more frequently they will have to be serviced, thus reducing the frequency at which each will be serviced with an input signal.
- D. The input gates of the FETs are predominantly capacitive, and as the signal frequency increases the capacitive loading also increases, thereby limiting the number of loads that may be attached to the output of the driving gate.
- Correct Answer
- The input gates of the FETs are predominantly capacitive, and as the signal frequency increases the capacitive loading also increases, thereby limiting the number of loads that may be attached to the output of the driving gate.
- 1. The range of negative numbers when using an eight-bit two's-complement system is ?1 to ?128.
Options- A. True
- B. False Discuss
- 2. A binary number's value changes most drastically when the ________ is changed.
Options- A. MSB
- B. frequency
- C. LSB
- D. duty cycle Discuss
- 3. When the term RAM is used with semiconductor memories, it usually means ________ as opposed to ROM.
Options- A. Random-Access Memory
- B. Read/Write Memory (RWM)
- C. flash memory
- D. temporary storage Discuss
- 4. The minimum input voltage recognized as HIGH by a TTL gate is ________.
Options- A. 2.0 V
- B. 2.4 V
- C. 0.8 V
- D. 5.0 V Discuss
- 5. Which of the following combinations of logic gates can decode binary 1101?
Options- A. One 4-input AND gate
- B. One 4-input AND gate, one OR gate
- C. One 4-input NAND gate, one inverter
- D. One 4-input AND gate, one inverter Discuss
- 6. When data input I4 of a 74148 octal-to-binary encoder is active, the data output is:
A0 = 1
A1 = 1
A2 = 0
Options- A. True
- B. False Discuss
- 7. The half-step sequence of a stepper motor is created by inserting a start with only one coil energized between full steps.
Options- A. True
- B. False Discuss
- 8. Is the propagation delay from the clock to the output for the 7476 the same as the delay from the set or reset to the output?
Options- A. yes
- B. no Discuss
- 9. The number of 16k × 4 memories needed to construct a 128k × 8 memory is ________.
Options- A. 4
- B. 8
- C. 12
- D. 16 Discuss
- 10. Memory devices that use electronic latching circuits are called ________.
Options- A. RAM
- B. flip-flops
- C. magnetic tape
- D. DRAM Discuss
More questions
Correct Answer: True
Correct Answer: MSB
Correct Answer: Read/Write Memory (RWM)
Correct Answer: 2.0 V
Correct Answer: One 4-input AND gate, one inverter
Correct Answer: True
Correct Answer: True
Correct Answer: yes
Correct Answer: 16
Correct Answer: flip-flops
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