Exercise: Msi Logic Circuits

Questions for: Msi Logic Circuits

Output 3 of a 74138 octal decoder is selected when it is enabled by a data input of:
A0 = 1
A1 = 1
A2 = 0
A:
True
B:
False
C:
D:
Answer: A
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A VARIABLE can be thought of as a piece of scrap paper used to write down some numbers that can be used later.
A:
True
B:
False
C:
D:
Answer: A
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A logic circuit that determines if one input is equal to another is called a comparator.
A:
True
B:
False
C:
D:
Answer: A
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A device that selects one of several inputs to be placed on the output is a multiplexer.
A:
True
B:
False
C:
D:
Answer: A
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What must be done in the given figure in order to use two 7485 4-bit comparators to compare two 8-bit numbers?

A:
The P < Q, P = Q, and P > Q outputs of COMP A must be connected to the same outputs of COMP B.
B:
The P < Q, P = Q, and P > Q outputs of COMP A must be connected to the <, =, and > inputs of COMP B.
C:
The = input of COMP A must be connected to Vcc, and the < and > inputs must be connected to ground.
D:
The P < Q, P = Q, and P > Q outputs of COMP A must be connected to the <, =, and > inputs of COMP B, the = input of COMP A must be connected to Vcc, and the < and > inputs must be connected to ground.
Answer: D
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