Analysis and Synthesis of Logic Functions using 4:16 Decoder (IC 74138)

INSTRUCTION

  1. Apply high volatge to \(V_{CC}\) and G1, and low level voltage to ground(GND)
  2. Apply low voltage to all the select inputs (DCBA). Y0 of first decoder will be at low state and all other are at high state.
  3. Apply low voltage to DCB and high volatge to A. Y1 of first decoder will be at low state and all other are at high state.
  4. Apply high voltage to D and low volatge to CBA. Y1 of second decoder will be at low state and all other are at high state.
  5. Click "Add to table" after every inputs. This will create the truth table in the below section.
  6. Note: Red button symbolize as Low (L), Green button symbolize as High(H).

TRUTH TABLE



4:16 Decoder
Decimal Select Inputs 1st Decoder 2nd Decoder
D C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

CIRCUIT DIAGRAM

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