Circuit Design of 4 to 16 Decoder Using 3 to 8 Decoder A decoder is a combinational circuit constructed with logic gates. It is the reverse of the encoder. A decoder circuit is used to transform a set of digital input signals into an equivalent decimal code of its output. For ‘n’ inputs a decoder gives 2^n outputs. In this article, we will discuss on 4 to 16 decoder circuit design using 3 to 8 decoder. An encoder is a combinational circuit that changes a set of signals into a code. For ‘2^n’ inputs an encoder circuit gives ‘n’ outputs. The following figure shows the block diagram of a decoder. Decoder Block Diagram 3 to 8 Decoder This decoder circuit gives 8 logic outputs for 3 inputs. The circuit is designed with AND and NAND combinations. It takes 3 binary inputs and activates one of the eight outputs. 3 to 8 Decoder Block Diagram Circuit Diagram The decoder circuit works only when the Enable pin is high. 3 to 8 Decoder Circuit Truth Table When the Enable (E) pin is low, all the output pins are low. S0 S1 S2 E D0 D1 D2 D3 D4 D5 D6 D7 x x x 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 0 1 0 0 0 1 1 1 0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 0 1 0 1 1 0 0 1 0 0 0 0 0 1 1 0 1 0 1 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 Circuit Design of 4 to 16 Decoder Using 3 to 8 Decoder A decoder circuit of the higher combination is obtained by adding two or more lower combinational circuits. 4 to 16 decoder circuit is obtained from two 3 to 8 decoder circuits or three 2 to 4 decoder circuits. When two 3 to 8 Decoder circuits are combined the enable pin acts as the input for both the decoders. When enable pin is high at one 3 to 8 decoder circuits then it is low at another 3 to 8 decoder circuit. Truth Table The Enable (E) pin acts as one of the input pins for both 3 to 8 decoder circuits. E A B C Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10 Y11 Y12 Y13 Y14 Y15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Circuit Diagram of 4 to 16 Decoder 4 to 16 Decoder Circuit Applications of Decoders In every wireless communication, data security is the main concern. The decoders are mainly designed to provide security for data communication by designing standard encryption and decryption algorithms. Decoders are used in audio systems to convert analogue audio into digital data. Used as a decompressor to convert compressed data like images and videos into decompressed form. Decoders use electronic circuits which convert computer instructions into CPU control signals. Therefore, this is all about the 4 to 16 decoder circuit design using a 3 to 8 decoder circuit. Furthermore, any queries regarding this article or electronics projects you can comment us in the comment section below. here is a question for you, what is the use of Enable pin encoder/ decoder? Share This Post: Facebook Twitter Google+ LinkedIn Pinterest Post navigation ‹ Previous Common Base Amplifier Circuit Working And Its ApplicationsNext › Class A Amplifier Circuit Working and Applications Related Content Substitution Theorem : Steps Involved in Solving it, Example Problems & Its Applications Enhancement MOSFET : Working, Differences & Its Applications Emitter Coupled Logic : Circuit, Working, as OR/NOR gate & Its Applications What is P Channel MOSFET : Working & Its Applications Comments are closed.
