Introduction
Asynchronous counters can be designed to count up or count down using Small-Scale Integration (SSI). The small-scale design can utilize almost any flip-flop type. To observe this process, we will simulate and analyze multiple 3-bit counters based on both D and J/K flip-flops. For both the D flip-flop and J/K flip-flop, we will modify circuits so that they will count up or count down. Remember, for up counters, connect the CLK to the Q output of the opposite polarity. For down counters, connect the CLK to the Q output of the same polarity.
Asynchronous counters can be designed to count up or count down using Small-Scale Integration (SSI). The small-scale design can utilize almost any flip-flop type. To observe this process, we will simulate and analyze multiple 3-bit counters based on both D and J/K flip-flops. For both the D flip-flop and J/K flip-flop, we will modify circuits so that they will count up or count down. Remember, for up counters, connect the CLK to the Q output of the opposite polarity. For down counters, connect the CLK to the Q output of the same polarity.