Question

Given below are two statements :
one is labelled as
Assertion (A) and the other is labelled as
Reason (R).
Assertion (A) :
In a synchronous counter, all flip flops toggle simultaneously.
Reason (R) :
All flip flops share the same clock signal.
In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Synchronous = "Same time." Because they share one clock, they act like a well-drilled military unit moving on a single whistle command!

Answer 1

The Correct Option is A

Concept:
• Counters are sequential circuits used to count pulses.
• Asynchronous (Ripple) Counters: The output of one flip-flop serves as the clock for the next.
• Synchronous Counters: All flip-flops are connected to a common global clock signal.

Step 1: Analyze the Assertion (A)
Because every flip-flop in a synchronous counter is triggered by the exact same clock edge, they all change their states at the same time.
There is no "ripple" effect or accumulated delay between stages.
Assertion (A) is correct.

Step 2: Analyze the Reason (R)
The definition of a synchronous system is one where all elements are synchronized to a single clock source.
By wiring the clock input of every flip-flop to the same external clock signal, we achieve simultaneous triggering.
Reason (R) is correct.

Step 3: Determine if (R) explains (A)
The simultaneous toggling is a direct physical result of sharing the same clock signal.
Therefore, (R) is the fundamental explanation for why (A) happens.