Integrated Circuit(IC)

Complex digital circuits are constructed with integrated circuits. IC is a small silicon semiconductor crystal, called a chip, containing the electronic components for the digital gates. The various gates are interconnected inside the chip to form the required circuit. The chip is mounted in a ceramic or plastic container and the connections are welded to the external pins to form an IC. The number of pins of IC vary from 14 to several thousand. Each pin is identified by a unique number printed on its body.

Categories

  1. SSI(Small Scale Integration Device)

It contains several independent gates in a single package. The inputs and outputs of gates are connected directly to the pins in the package. The number of gates is usually less than 10.

2.  MSI(Medium Scale Integration Device)

It contains 10 to 200 gates in a single package. They perform elementary digital functions such as decoders, adders, registers.

3. LSI(Large Scale Integration Device)

It contains gates between 200 to few thousand in a single package. They include digital systems such as processors, memory chips etc.

4. VLSI(Very Large Scale Integration Device)

It contains thousands of gates within a single package such as microcomputer chip.

5. ULSI(Ultra Large Scale Integration Device)

It contains hundred of thousands of gates within a single package such as microcomputer chip.

 

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