Combinational Gate Logic -2
Assessment
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AMIR RAHIM
•
Physical Ed
•
University
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6 plays
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Hard
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4 questions
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1.
Multiple Choice
The 74138 is a 3-to-8 decoder. Together, two of these ICs can be used to form one 4-to-16 decoder. To do this, connect
one decoder to the LSBs of the input; the other decoder to the MSBs of the input
all chip select lines to ground
all chip select lines to their active levels
one chip select line on each decoder to the input MSB
2.
Multiple Choice
The decimal-to-binary encoder shown does not have a zero input. This is because
when zero is the input, all lines should be LOW
zero is not important
zero will produce illegal logic levels
another encoder is used for zero
3.
Multiple Choice
If the data select lines of the MUX are S1S0 = 11, the output will be
LOW
HIGH
equal to D0
equal to D3
4.
Multiple Choice
The 74138 decoder can also be used as
an encoder
a DEMUX
a MUX
none of the above
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