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Digital Electronics

Digital Electronics
Which one of the following is an invalid state in 8-4-2-1 binary coded decimal counter

 1001
 1100
 0011
 1000

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Digital Electronics
Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

ECL
TTLLS
CMOS
TTLAS

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Digital Electronics
NAND. gates are preferred over others because these

provide maximum density in a chip.
consume least electronic power
have lower fabrication area
can be used to make any gate

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Digital Electronics
An EPROM

 is of random-access type
 is programmable
 is non volatile
All of these

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Digital Electronics
The logic expression AB can be implemented by giving the inputs A and B to a two-input

 NAND gate
 X-NOR gate
 NOR gate
 X-OR gate

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Digital Electronics
The time required for a gate to change its output is called as

 run time
 propagation time
 Decay time
 start time

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