Exercise: Integrated Circuit Logic Families

Questions for: Integrated Circuit Logic Families

Which of the following logic families has the highest noise margin?
A:
TTL
B:
LS TTL
C:
CMOS
D:
HCMOS
Answer: D
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What type of circuit is represented in the given figure, and which statement best describes its operation?

A:
It is a tristate inverter. When the ENABLE input is HIGH, the output is effectively an open circuit—it is neither LOW nor HIGH.
B:
It is a programmable inverter. It can be programmed to function as either an active LOW or an active HIGH inverter.
C:
It is an active LOW buffer, which can be turned on and off by the ENABLE input.
D:
None of the above.
Answer: A
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What type of circuit is shown below, and how is the output ordinarily connected?

A:
It is an open-collector gate and is used to drive loads that cannot be connected directly to Vcc due to high noise levels.
B:
It represents an active-LOW inverter and is used in negative logic systems.
C:
It is an open-collector gate. An external load must be connected between the output terminal and an appropriate supply voltage.
D:
Any of the above could be correct, depending on the specific application involved.
Answer: C
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What is the static charge that can be stored by your body as you walk across a carpet?
A:
300 volts
B:
3,000 volts
C:
30,000 volts
D:
Over 30,000 volts
Answer: D
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What must be done to interface CMOS to TTL?
A:
A dropping resistor must be used on the CMOS 12 V supply to reduce it to 5 V for the TTL.
B:
As long as the CMOS supply voltage is 5 V, they can be interfaced; however, the fan-out of the CMOS is limited to two TTL gates.
C:
A 5 V Zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates.
D:
The two series cannot be interfaced without the use of special interface buffers designed for that purpose, such as the open-collector buffers.
Answer: B
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