Exercise: Integrated Circuit Logic Families

Questions for: Integrated Circuit Logic Families

Which of the following statements apply to CMOS devices?
A:
The devices should not be inserted into circuits with the power on.
B:
All tools, test equipment, and metal workbenches should be tied to earth ground.
C:
The devices should be stored and shipped in antistatic tubes or conductive foam.
D:
All of the above.
Answer: D
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What are the major differences between the 5400 and 7400 series of ICs?
A:
The 5400 series are military grade and require tighter supply voltages and temperatures.
B:
The 5400 series are military grade and allow for a wider range of supply voltages and temperatures.
C:
The 7400 series are an improvement over the original 5400s.
D:
The 7400 series was originally developed by Texas Instruments. The 5400 series was brought out by National Semiconductors after TI's patents expired, as a second supply source.
Answer: B
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What causes low-power Schottky TTL to use less power than the 74XX series TTL?
A:
The Schottky-clamped transistor
B:
Nothing. The 74XX series uses less power.
C:
A larger value resistor
D:
Using NAND gates
Answer: C
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What must be done to interface TTL to CMOS?
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 TTL is limited to five CMOS 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:
A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node.
Answer: D
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Which of the following summarizes the important features of ECL?
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:
Slow 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
Answer: A
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