## What is a 3 to 8 line decoder?

3 to 8 line decoder demultiplexer is a combinational circuit that can be used as both a decoder and a demultiplexer. IC 74HC238 decodes three binary address inputs (A0, A1, A2) into eight outputs (Y0 to Y7). The device also has three Enable pins. The same combination is used as a demultiplexer.

## How do you use a 3/8 decoder?

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 many 3 to 8 line decoder with an enable input are needed to construct a 62 64 line decoder without using any other logic gates?

GATE | GATE-CS-2007 | Question 85 How many 3-to-8 line decoders with an enable input are needed to construct a 6-to-64 line decoder without using any other logic gates? hence required decoders (from fig.) = 9 so ans is ( C) part.

### What is IC 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.

### How many 3 to 8 decoder do you need if you are going to design a 6 to 64 decoder?

How many 3-to-8 line decoders with an enable input are needed to construct a 6-to-64 line decoder without using any other logic gates? hence required decoders (from fig.) = 9 so ans is ( C) part.

What are the minimum number of 2 to 1 multiplexers required?

three
We need to implement 4 to 1 Mux using 2 to 1 Mux. We need 4/2 = 2 in first level and 2/2 = 1 in second level. Hence, we need three 2 to 1Multiplexers to implement 4 to 1 Mux.

#### What is the truth table for a 3 to 8 decoder?

3 to 8 Decoder. 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 to design a 3 to 8 decoder?

3 to 8 Decoder designing steps 1 Problem: 3 to 8 line decoder. 2 The number of available inputs are 3 and outputs are 8. 3 Let us represent the inputs and outputs by symbol letters. Let us represent the inputs by x, y, and z; and the outputs… 4 3 to 8 Decoder Truth Table: More

How to construct decoder with truth table and logic gates?

Truth table with E input Inputs Inputs Inputs Inputs Outputs E I 2 I 1 I 0 O 0 0 – – – 0 1 0 0 0 1 1 0 0 1 0

## How many minterms does a 3 to 8 line decoder generate?

Likewise, 3 line to 8 line decoder generates eight minterms for 3 input variables of A0, A1 & A2. The implementation of this 3 line to 8 line decoder can be done using two 2 lines to 4 line decoders. We have discussed above that 2 to 4 line decoder includes two inputs and four outputs.