Basic MOS Technology
Transistor was first invented by William.B.Shockley, Walter Brattain and John Bardeen
of Bell Labratories. In 1961, first IC was introduced.
Levels of Integration:i)
SSI:- (10-100) transistors => Example: Logic gates
MSI:- (100-1000) => Example: counters
LSI:- (1000-20000) => Example:8-bit chip
VLSI:- (20000-1000000) => Example:16 & 32 bit up
ULSI:- (1000000-10000000) => Example: Special processors, virtual reality
machines, smart sensors
Moore’s Law:“The number of transistors embedded on the chip doubles after every one and a half
years.” The number of transistors is taken on the y-axis and the years in taken on the xaxis. The diagram also shows the speed in MHz. the graph given in figure also shows the
variation of speed of the chip in MHz.
Figure 1. Moore’s law