Exercise: Digital Electronics

Questions for: Digital Electronics

The 54/74164 chip is an 8-bit serial-input-parallel-output shift register. The clock is 1 MHz. The time needed to shift a 8-bit binary number into the chip is
A:
1 Ξs
B:
2 Ξs
C:
8 Ξs
D:
16 Ξs
Answer: C
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The stack is a specialized temporary __________ access memory during __________ and __________ instructions.
The 8156 of a figure has RAM locations from 2000 H to 20 FFH.
A:
random, store, load
B:
random, push, load
C:
sequential, store, pop
D:
sequential, push, pop
Answer: D
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Mark the false statement:
A:
since wave-shape of a digital signal is unimportant, linear amplifiers are not required
B:
the precise amplitude of a digital signal is also unimportant provided two voltage levels (0 and 1) are quite different
C:
the leading and trailing edges of a digital signal need not be sharp
D:
actual digital waves have rise and fall times of the order of a few nano seconds
Answer: C
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If the switch is thrown to the START position, Q and Y will be equal to
A:
Q = 0, Y = 0
B:
Q= 1, Y= 1
C:
Q = 1, Y = CLK
D:
Q = 0, Y = CLK
Answer: C
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For the K map in the given figure, the simplified expression is
A:
xl x2 x4 + x2 x4 + x1 x3
B:
x2 x4 + x2 x4 + x1 x3
C:
x1 x2 x4 + xl x2 + x3 x4 + x2x4
D:
x1 x2 + x2 x3 + x3x4
Answer: B
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