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Digital Electronics
‣
Logic Families and Their Characteristics
Comments
Question
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
Correct Answer
to provide the HIGH voltage
Logic Families and Their Characteristics problems
Search Results
1. 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
2. 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%
Show Answer
Scratch Pad
Discuss
Correct Answer: 10%, 90%, 90%, 10%
3. 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
4. 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
5. 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
6. 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
7. 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
8. 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,
9. Why is a pull-up resistor needed when connecting TTL logic to CMOS logic?
Options
A. to increase the output LOW voltage
B. to decrease the output LOW voltage
C. to increase the output HIGH voltage
D. to decrease the output HIGH voltage
Show Answer
Scratch Pad
Discuss
Correct Answer: to increase the output HIGH voltage
10. The output current capability of a single 7400 NAND gate when HIGH is called ________.
Options
A. source current
B. sink current
C.
I
OH
D. source current of
I
OH
Show Answer
Scratch Pad
Discuss
Correct Answer: source current
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