COMPUTER SCIENCE AND ENGINEERING
DIGITAL LOGIC
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
10
|
|
|
8
|
|
|
5
|
|
|
4
|
Detailed explanation-1: -A decade counter needs at least 4 flip flops within its chain because it counts in a sequence of ten and returns to zero after the count crosses 9.
Detailed explanation-2: -It requires 4 flip-flops to construct a decade counter.
Detailed explanation-3: -A four-bit counter is designed using 4 flip-flops and a corresponding combinational circuit. It can count from 0 to 2n-1 i.e. 2n numbers. Here given n = 4 therefore maximum number that can be counted is 24-1 = 15.
Detailed explanation-4: -A decade counter requires 4 flip-flops. One way to make the counter recycle after the count of 9 (1001) is to decode count 10 (1010) with a NAND gate and connect the output of the NAND gate to the clear (CLR) inputs of the flip-flops, as shown in Fig1-6(a).
Detailed explanation-5: -The correct option is 10. Concept: Counters: It is a sequential logic circuit that has a clock input signal and a group of output signals.