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Digital Electronics
‣
Logic Families and Their Characteristics
Comments
Question
The rise time (
t
r
) is the time it takes for a pulse to rise from its ________ point up to its ________ point. The fall time (
t
f
) is the length of time it takes to fall from the ________ to the ________ point.
Options
A. 10%, 90%, 90%, 10%
B. 90%, 10%, 10%, 90%
C. 20%, 80%, 80%, 20%
D. 10%, 70.7%, 70.7%, 10%
Correct Answer
10%, 90%, 90%, 10%
Logic Families and Their Characteristics problems
Search Results
1. The most common TTL series ICs are:
Options
A. E-MOSFET
B. 7400
C. quad
D. AC00
Show Answer
Scratch Pad
Discuss
Correct Answer: 7400
2. The TTL HIGH level source current is higher than the LOW level sinking current.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
3. An open collector output can ________ current, but it cannot ________.
Options
A. sink, source current
B. source, sink current
C. sink, source voltage
D. source, sink voltage
Show Answer
Scratch Pad
Discuss
Correct Answer: sink, source current
4. Why is a decoupling capacitor needed for TTL ICs and where should it be connected?
Options
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
Show Answer
Scratch Pad
Discuss
Correct Answer: to reduce the effects of noise, connect between power supply and ground
5. Which of the following summarizes the important features of emitter-coupled logic (ECL)?
Options
A. low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
B. good noise immunity, negative logic, high-frequency capability, low power dissipation, and short propagation time
C. low propagation time, high-frequency response, low power consumption, and high output voltage swings
D. poor noise immunity, positive supply voltage operation, good low-frequency operation, and low power
Show Answer
Scratch Pad
Discuss
Correct Answer: low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
6. Ten TTL loads per TTL driver is known as:
Options
A. noise immunity
B. fan-out
C. power dissipation
D. propagation delay
Show Answer
Scratch Pad
Discuss
Correct Answer: fan-out
7. Why is a pull-up resistor needed for an open collector gate?
Options
A. to provide
V
cc
for the IC
B. to provide ground for the IC
C. to provide the HIGH voltage
D. to provide the LOW voltage
Show Answer
Scratch Pad
Discuss
Correct Answer: to provide the HIGH voltage
8. If all inputs to a TTL NAND gate are low, what is the ON, OFF condition of each transistor in the circuit?
Options
A.
Q
1
-ON,
Q
2
-OFF,
Q
3
-ON,
Q
4
-OFF
B.
Q
1
-ON,
Q
2
-ON,
Q
3
-OFF,
Q
4
-OFF
C.
Q
1
-OFF,
Q
2
-OFF,
Q
3
-ON,
Q
4
-ON
D.
Q
1
-OFF,
Q
2
-ON,
Q
3
-OFF,
Q
4
-ON
Show Answer
Scratch Pad
Discuss
Correct Answer:
Q
1
-ON,
Q
2
-OFF,
Q
3
-ON,
Q
4
-OFF
9. Assume that a particular IC has a supply voltage (
V
cc
) equal to +5 V and
I
CCH
= 10 mA and
I
CCL
= 23 mA. What is the power dissipation for the chip?
Options
A. 50 mW
B. 82.5 mW
C. 115 mW
D. 165 mW
Show Answer
Scratch Pad
Discuss
Correct Answer: 82.5 mW
10. Fan-out is determined by taking the ________ result(s) of ________.
Options
A. smaller,
B. larger,
C. smaller,
D. average,
Show Answer
Scratch Pad
Discuss
Correct Answer: smaller,
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