Counters – Notes – 1

1. A sequential logic system uses FFs, counters, and registers, along with logic gates. Its outputs and sequence of operations depend on present and past inputs.

2. Troubleshooting a sequential logic system begins with observation of the system operation, followed by analytical reasoning to determine the possible causes of any malfunction, and finally test measurements to isolate the actual fault.

3. A ring counter is actually an N-bit shift register that recirculates a single 1 continuously, thereby acting as a MOD-N counter. A Johnson counter is a modified ring counter that operates as MOD-2N counter.

4. Digital one-shots are implemented with a counter loaded with a delay value when the trigger input is detected and counts down to zero. During the countdown time, the output pulse is held HIGH.

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