Discussion
A ripple counter is faster than a synchronous counter of the same length.
Answer: B
Correct answer: False
The statement is false - the reverse is true. A ripple counter is slower. In a ripple, or asynchronous, counter only the first flip-flop receives the clock; each later stage is clocked by the output of the one before it. The change therefore propagates along the chain, and the total settling time is the number of stages multiplied by the propagation delay of one. A four-stage counter takes four gate delays to settle. In a synchronous counter every flip-flop is clocked simultaneously and combinational logic decides which stages change, so the whole counter settles in a single delay regardless of length. Speed is not the only difference. While a ripple counter is settling it passes through transient false states, which can produce glitches if the outputs are decoded - a real hazard in control circuits. A synchronous counter never shows a false intermediate count. The ripple counter’s advantage is simplicity: it needs no extra gates at all.
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