Logic circuits for digital systems may be
Consists of logic gates whose outputs at any
time are determined by combining the values
of the applied inputs using logical operations.
Combinational circuit with a number of
output lines, only one of which is asserted at
any time, dependent on the pattern of input
n inputs and 2n outputs.
21 = 2
22 = 4
23 = 8
Converts binary information from the n coded
inputs to a maximum of 2n unique outputs.
Larger decoders from small decoders with
3-8 line decoder from 2-4 line decoders
6-64 line decoder from 4-16 line decoders
3-to-8-line decoder constructed from two 2to-4-line decoders
The MSB is connected to the enable inputs
if A2=0, upper is enabled; if A2=1, lower is enabled.
Combinational logic circuit which performs
reverse of decoder functions.
Accepts an active level on one of its inputs
and converts to a coded output.
The process of converting familiar symbols or
numbers to a coded format is called
Highest priority takes precedence.