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Digital Electronics - Logic Families and Their Characteristics


Exercise

"We cannot solve our problems with the same thinking we used when we created them."
- Albert Einstein
26. 

Totem-pole outputs ________ be connected ________ because ________.

A. can, in parallel, sometimes higher current is required
B. cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
C. should, in series, certain applications may require higher output voltage
D. can, together, together they can handle larger load currents and higher output voltages

27. 

The high input impedance of MOSFETs:

A. allows faster switching
B. reduces input current and power dissipation
C. prevents dense packing
D. creates low-noise reactions

28. 

The output current capability of a single 7400 NAND gate when HIGH is called ________.

A. source current
B. sink current
C. IOH
D. source current of IOH

29. 

The time needed for an output to change from the result of an input change is known as:

A. noise immunity
B. fan-out
C. propagation delay
D. rise time

30. 

The problem of interfacing IC logic families that have different supply voltages (VCC's) can be solved by using a:

A. level-shifter
B. tristate shifter
C. decoupling capacitor
D. pull-down resistor




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