Up to this point in this text all of the circuits are simple, or non-sequential, circuits. These circuits are called simple because the current is applied and the circuit takes on a set of values spec...Up to this point in this text all of the circuits are simple, or non-sequential, circuits. These circuits are called simple because the current is applied and the circuit takes on a set of values specified by the Boolean function for the circuit. The circuits have no state, or memory, of what previous values the circuit had. The state of a circuit is the values of all memory which is stored. State is maintained in memory, and memory is just a place to store the values that make up the state.