DIGITAL ELECTRONICS
Introduction:
We are always busy dealing with quantities.There are basically two ways of representing the numerical value of quantities:analog and digital.Analog quantities have important characteristics that they can vary over a continuous range of value, e.g. movement of hour,minute or second needle in analog watch as time passes or movement of speedometer needle on its panel as the speed of the vehicle is changed etc. In digital world the quantity is rather represented by symbols called digits.The digital representation is therefore discrete, e.g. the panel of digital watch changes in a discrete way in the steps of one second.
Some Basic Definitions:
- Digital Circuit:A circuit that is designed for two-state operation. Input and output of the digital circuit is either treated as low or high (two states).
- Gate:A digital circuit with one or more input voltages but only one output voltage. The most basic gates are the NOT gate, the OR gate and the AND gate.
- Logic circuits:Different combination of basic gates, called logic circuits, can be used to simulate the various functions associated with human brain.
- Binary Numbers:The digits 0 and 1 are called as binary numbers.
- Bit::Stands for the abbreviation for binary digit.It is the smallest binary unit.
- Nibble:A 4-bit binary number is called a nibble.
- Byte:It refers to the binary number with 8 bits; this has become the basic unit of data used in computers.
- Truth Table:A table that shows all the input-output possibilities of a logic circuit.
- TTL Circuits:It stands for transistor-transistor logic (TTL) that represents a family of widely used digital devices. This fast and inexpensive family was introduced, in 1964, by Texas Instruments.
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