UNDERSTANDING THE DATASHEETS OF BASIC GATES AND DECODER IC'S

Many of us use the logic gates for circuit designing. These gates can be made using transistors,diodes,resistors etc. It is not as  easy as it is said. But these gates are packed into ic's and are readily available in the market. We can use these ic's for our purpose. Mainly there are two types of ic's. One is TTL and other is CMOS. TTL stands for transistor-transistor logic whereas CMOS stands for complementary metal oxide semiconductors. TTL make use of the transistors and hence the logic levels are for low is "0V" and for high is "5V". But it is always not necessary that only 0V or 5V must be used. Logic low can be in the range of ( 0-0.8)V and logic high can be in the range of ( 2-5)V.
              CMOS make use of the MOSFET'S
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