The digital circuits we have looked at some far have been combinational. These are in principle static, and time does not play a major role (except for practical issues such as glitches). On the other hand, in sequential circuits timing is central. Indeed, synchronous sequential circuits are designed to change state at regular times determined by a clock pulse.
Sequential circuits will be studied in detail later, but for now we have a quick look at flip flops and counters.
ANU Engineering - ENGN3213