Combinational circuits - those circuits in which the output values depend at all times on the input values., Sequential circuits - those circuits in which the output values at any given time also depend on past input values., Encoders - they have 2n input lines and n-bit output lines. On activating one of the input lines, a binary combination appears in the output, corresponding to the decimal number assigned to that input., Decoders - they are circuits with n-bit input lines and a smaller number or the same as the 2n output lines. They convert decoded information in any binary code to non-coded information (decimal). , Multiplexers - they have 2n data input lines, n selection lines and only one out-put. They channel the information from several sources to a common line., Demultiplexers - they have just one input, n selection input lines and 2n output lines. They transfer information from the input to the selected output with the selection input lines., Adders - In order to add numbers of various bits, the adder circuit is used. They are added up bit by bit, bistable (flip-flop) - a sequential circuit that is capable of remaining in one of the two states possible for an unlimited period of time in the absence of disturbance, Asynchronous bistable - each input-output variation varies the output signals., Synchronous bistable - the circuit evolves with a clock signal and can be activated by level or edge.,

keywords digital electronics

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