Exercise: Digital Electronics

Questions for: Digital Electronics

Status register in the 8156 is read with
A:
IN 20 H
B:
OUT 20 H
C:
either (a) or (b)
D:
none of the above
Answer: A
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The output Y of the circuit shown in the figure is
A:
(A + B) C + DE
B:
AB + C(D + E)
C:
(A + B) C + D + E
D:
(AB + C) . DE
Answer: A
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ECL can be used to high frequencies in the order of
A:
500 kHz
B:
1 MHz
C:
100 MHz
D:
500 MHz
Answer: D
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In a flip-flop with a NAND latch, a low R and a low S produces
A:
active condition
B:
inactive condition
C:
race condition
D:
dead condition
Answer: C
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For a binary half subtractor having two inputs A and B the correct sets of logical expressions for the outputs D (A - B) and X = Borrow are
A:
D = AB + AB, X = AB
B:
D = AB AB, X = AB
C:
D = AB + AB, X = AB
D:
D = AB + A B, X = AB
Answer: C
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