Logic module
In electronics, a logic module is used to describe digital integrated circuits which can be implemented in the range from very simple to very complex logic switching functions. The range of components ranges from components with several simple logic gates , such as AND , OR and NAND gates (see picture) and flip-flops , to programmable logic components such as PLDs , FPGAs , gate arrays and customer-specific integrated circuits (ASICs) .
Due to the abstract approach in the development of electrical circuits today, the term is now also associated with a virtual module from the library of EDA software, i.e. the description of a digital circuit function.
In the early days of digital technology, logic functions and memories were also implemented with discrete components ( relays , electron tubes or transistors and the required load resistors). One or more functions were each on a circuit board . Simple logic functions or logic circuits implemented with relays are still used today, for example in the self-holding function , the impulse relay or the emergency stop switch. In addition to the microprocessor, the early home computers and personal computers of the 1970s and 1980s usually included a large number of logic modules from the 74xx series, such as the Apple I , the Apple II and the first IBM PC from 1981.
The CMOS circuits of the 4000 and 74C / HC series represent another important group of logic modules .
In a broader sense, the logic components also include the memory components , starting with the 1- bit memory (flip-flop) up to the complex memory component . For industrial controls, logic functions are also implemented using fluid technology ( pneumatics , hydraulics ).