| Parameter | Ring Counter | Johnson Counter (Twisted Ring Counter) | Ripple Counter (Asynchronous Counter) |
|---|---|---|---|
| Basic Principle | Shift register with output fed back to input | Inverted output fed back to input | Flip-flops connected in cascade |
| Type | Shift Register Counter | Modified Shift Register Counter | Asynchronous Counter |
| Feedback | Direct Feedback | Complemented Feedback | No Feedback |
| Number of Flip-Flops | n | n | n |
| Number of States | n | 2n | 2ⁿ |
| Modulus (MOD) | n | 2n | 2ⁿ |
| Clock Input | Common Clock | Common Clock | Only first FF receives clock |
| Speed | Fast | Fast | Slow |
| Propagation Delay | Low | Low | High |
| Complexity | Simple | Moderate | Very Simple |
| Decoding Circuit | Simple | Simple | More Complex |
| Unused States | Many | Fewer | None |
| Power Consumption | Moderate | Moderate | Low |
| Reliability | High | High | Lower at high frequency |
| Operating Frequency | High | High | Low to Medium |
| Synchronization | Synchronous | Synchronous | Asynchronous |