Sequential Cell Design10106081030300Sequential Cell DesignThis chapter details the structure and behaviour of latches. The RS latch, the D latch and the edge-sensitive register are presented. The counters are also introduced, with an application concerning a 24-hour clock.The Elementary LatchCombinational circuits are able to add, multiply, shift, etc. However, combinational circuits cannot store and retain values. The basis for storing an elementary binary value is called a latch. The simplest CMOS circuit is made from two inverters.