Theory 

> An 8-to-3 Encoder is a combinational circuit that converts eight input lines into three binary output lines.

> Operation:

• Only one input is assumed to be high (1) at a time.
  
  

• The encoder produces a 3-bit binary code corresponding to the position of the active input.

Truth Table 

Boolean Expression

Y2 ​= D4+D5+D6+D7

Y1 = D2+D3+D6+D7

Y0 = D1+D3+D5+D7​ 

Block Diagram