There are four levels of integration in Digital ICs. You can find these details asked as viva questions in digital electronics lab. The categorization is based on the circuit complexity as measured by the number of gates in a single package. The various levels of integration are small, medium, large or very large scale integration.
- The Small Scale Integration devices contain several independent gates in a single package. The number of gates in SSI is usually lesser than 10.
- The Medium Scale Integration devices have about 10 to 1000 gates in a single package. They are used to perform specific elementary digital operations. They include decoders, adders and multiplexers.
- The Large Scale Integration devices have thousands of gates in a single package. They include processors, memory chips and programmable logic devices.
- The Very Large Scale Integration devices have hundred of thousands of gates within single package. They include large memory arrays and complex microcomputer chips.