Digital fundamentals

Digital fundamentals

1. ligic gates

   • Aircraft logic systems follow the same conventions and standards as those used in other electronic applications. In particular, the MIL/ANSI standard logic symbols are invariably used and the logic elements that they represent operate in exactly the same way as those used in non-aircraft applications.

2. combinational logic systems

   • By using a standard range of logic levels (i.e. voltage levels used to represent the logic 1 and logic 0 states) logic circuits can be combined together in order to solve more complex logic functions.

3. monostable devices

   • Monostable (or one-shot) devices provide us with a means of generating precise time delays. Such delays become important in many logic applications where logic states are not static but change with time.

4. decoders

   • A variety of different coding schemes are used to represent numerical data in avionic systems. They include binary (or, more correctly, natural binary ), binary coded decimal ( BCD ), Gray code , octal (base 8), and hexadecimal

5. encoders

   • Encoders provide the reverse function to that of a decoder. In other words, they accept a number of inputs and then generate a binary code corresponding to the state of those inputs. T

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