Electronics Engineering » Notes » Counters
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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Counters » Exercise - 1 1. The purpose of introducing feedback loop in digital counter circuit is : (a) To improve distortion (b) To improve stability (c) Synchronise input and output pulses (d) to reduce the number of input pulses to reset the counter 2. The circuit shown below is a : (a) Mod-4 counter (b) Mod-5 counter (c) Mod-6 counter (d) Mod-7 counter 3. In this type of counter, the output of the last stage is connected to the D input of the first stage. (a) Ring Counter (b) Johnson Counter (c) Straight Counter (d) None of the above 4. A counter is a : (a) Sequential circuit (b) Combinational circuit (c) Both combinational and sequential circuit (d) None of above 5. A counter with 10 states : (a) Cascading asynchronous counter (b) Decade counter (c) Asynchronous ripple counter (d) Ripple counter 6. In this type of counter, the complement of the output of the last stage of the shift register is fed back to the D input of the first state. (a) Ring Counter (b) Johnson Counter (c) Straight Counter (d) None of the above 7. It is a sequential circuit that cycles through a sequence of states : (a) Multiplexer (b) Demultiplexer (c) Counter…- Counters » Exercise - 1 6. In this type of counter, the complement of the output of the last stage of the shift register is fed back to the D input of the first state. (a) Ring Counter (b) Johnson Counter (c) Straight Counter (d) None of the above
- Counters » Exercise - 142. Which of the following is a type of shift register counter? (a) Decade (b) Binary (c) Ring (d) BCD
- Shift Registers » Exercise - 120. In a 6-bit Johnson counter sequence there are a total of how many states, or bit patterns? (a) 2 (b) 6 (c) 12 (d) 24
- Shift Registers » Exercise - 119. In a 4-bit Johnson counter sequence there are a total of how many states, or bit patterns? (a) 1 (b) 2 (c) 4 (d) 8