Octal to binary encoder

Octal to binary encoder

1. ECE 213 OCTAL TO BINARY ENCODER SUBMITTED TO : MA’AM. ALICE GHAI SUBMITTED BY : AJAY,ARNAV,HRISHABH SECTION : K1 632 ROLL.NO : B51,52,53

2. An encoder is a digit circuit that performs the inverse operation of a decoder. An encoder has 2n (or less) input lines and n output lines. An encoder is the octal – to – binary encoder. It has eight inputs, one for each of the octal digits, and three outputs that generate the corresponding binary number . Encoder

3. An octal to binary encoder consists of eight input lines and three output lines. Each input line corresponds to each octal digit and three outputs generate corresponding binary code. In encoders, it is to be assumed that only one input is active or has a value 1 at any given time otherwise the circuit has no meaning. The figure below shows the logic symbol of octal to binary encoder along with its truth table. Octal to Binary Encoder

4. 74148 Octal-to-Binary Encoder logic symbol and function table

5. From the above table, the output Q2 becomes 1 if any of the digits D4 or D5 or D6 or D7 is one. Thus, we can write its expression as Q2 = D4 + D5 + D6 + D7 Q 1 = D2 + D3 + D6 + D7 and Q0 = D1 + D3 + D5 + D7 Also D does not exist in any of the expressions so it is considered as don’t care. From the above expressions, we can implement the octal to binary encoder using set of OR gates as shown in figure below .

6. There is ambiguity in the octal to binary encoder that when all the inputs are zero, an output with all 0’s is generated .

7. Encoders can be used to generate a coded output from a singular active numeric input line. Summary

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