What is a decoder explain a 3 to 8 decoder with logic diagram?
A 3 to 8 decoder has three inputs (A,B,C) and eight outputs (DO to D7). Based on the 3 inputs one of the eight outputs is selected. The truth table for 3 to 8 decoder is shown in table (1). From the truth table, it is seen that only one of eight outputs (DO to D7) is selected based on three select inputs.
How do you make a 3/8 decoder?
From the above Boolean expressions, the implementation of 3 to 8 decoder circuit can be done with the help of three NOT gates & 8-three input AND gates. In the above circuit, the three inputs can be decoded into 8 outputs, where every output represents one of the midterms of the three input variables.
What is a 3 to 8 encoder?
8 : 3 Encoder (Octal to Binary) – The 8 to 3 Encoder or octal to Binary encoder consists of 8 inputs : Y7 to Y0 and 3 outputs : A2, A1 & A0. Each input line corresponds to each octal digit and three outputs generate corresponding binary code.
What is decoder explain with circuit diagram?
Decoder is a combinational circuit that has ‘n’ input lines and maximum of 2n output lines. One of these outputs will be active High based on the combination of inputs present, when the decoder is enabled. That means decoder detects a particular code.
What is a 4 to 1 multiplexer?
A 4-to-1 multiplexer consists four data input lines as D0 to D3, two select lines as S0 and S1 and a single output line Y. The select lines S0 and S1 select one of the four input lines to connect the output line.
Which are the enable pins for 3/8 decoder?
The enable pins are two active low & one active high. The output of the decoder can drive 10 low-power Schottky TTL equal loads, and all the inputs are defended from harm because of static discharge with diodes toward VCC as well as the ground. This article discusses an overview of 74LS138 IC:3 to 8 Line Decoder IC.
What is decoder with example?
A decoder is a circuit which has n inputs and 2n outputs, and outputs 1 on the wire corresponding to the binary number represented by the inputs. For example, a 2-4 decoder might be drawn like this: and its truth table (again, really four truth tables, one for each output) is: i1. i0.
How do you make a 4 1 mux?
What is a multiplexer Sanfoundry?
Digital Circuits Questions and Answers – Multiplexers (Data Selectors) – 1. Explanation: A multiplexer (or MUX) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line, depending on the active select lines.
What is a 4 to 16 decoder?
General description. The 74HC154; 74HCT154 is a 4-to-16 line decoder/demultiplexer. It decodes four binary weighted address inputs (A0 to A3) to sixteen mutually exclusive outputs (Y0 to Y15). The device features two input enable (E0 and E1) inputs. A HIGH on either of the input enables forces the outputs HIGH.
What is a 74138?
IC 74138 is a Logical Decoder IC. It also has a demultiplexing facility. The IC 74138 is available in the market with the name of 74LS138. It is a 3 to 8 decoder IC. The internal circuit of this IC is made of high-speed Schottky barrier diode.
Why is decoder used?
Introduction Of Decoder. The decoder is an electronic device that is used to convert digital signal to an analogue signal. It allows single input line and produces multiple output lines. The decoders are used in many communication projects that are used to communicate between two devices.
What is the logic diagram of a 3 to 8 decoder?
Fig (1): Logic diagram of 3 to 8 decoder. It is also called a binary-to-octal decoder, since the inputs represent 3-bit binary numbers and the outputs represent the eight digits in the octal number system. Fig (2): 3-to-8 decoder in IC form.
How many outputs does a 3 to 8 line decoder have?
This decoder circuit gives 8 logic outputs for 3 inputs and has a enable pin. The circuit is designed with AND and NAND logic gates. It takes 3 binary inputs and activates one of the eight outputs. 3 to 8 line decoder circuit is also called as binary to an octal decoder.
How to construct a block diagram of a decoder?
A block diagram of decoder consists of n input lines, one or more enable inputs and 2n maximum number of output lines. To construct a decoder, we require to know the number of all possible output lines that totally depends on the given input. So, if n represents given input lines then possible output lines would be 2 n.
How many decoders are needed for a 4 to 16 circuit?
Therefore, we require two 3 to 8 decoders for implementing one 4 to 16 decoder. The block diagram of 4 to 16 decoder using 3 to 8 decoders is shown in the following figure. The parallel inputs A 2, A 1 & A 0 are applied to each 3 to 8 decoder.
