Abstract
This chapter describes the mechanism of converting the RS bistable to a clocked RS bistable. The logic levels of the S and R inputs are inverted by the NAND gates in the clock circuit; this has a knock-on effect on the truth table. The JK bistable is the second of the four bistables that are available. It is particularly popular because it can be easily made to behave like any of the others; this is the reason it has been referred to as the “universal” bistable. While it is quite possible to build a JK from basic gates, or even from transistors, it is a pointless exercise. In the integrated form, users can buy two JKs in a single chip for less than a cup of tea. To build it from separate gates or components would not only be more expensive, but it would be more difficult, consume more power, and take more space.
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