How many 3 to 8 decoders and 2 input AND gates do we need to construct a 4 to 16 decoder?

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.

What is the difference between 2 to 4 decoder and 3 to 8 decoder?

We know that 2 to 4 Decoder has two inputs, A1 & A0 and four outputs, Y3 to Y0. Whereas, 3 to 8 Decoder has three inputs A2, A1 & A0 and eight outputs, Y7 to Y0. m1 is the number of outputs of lower order decoder. m2 is the number of outputs of higher order decoder.

Which of the following can be used to construct the 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 many and gates are required to implement a 3 to 8 decoder with an enable?

Using the above expressions, the circuit of a 3 to 8 decoder can be implemented using three NOT gates and eight 3-input AND gates as shown in fig (1). The three inputs A, B and C are decoded into eight outputs, each output representing one of the midterms of the 3-input variables.

How to make a 3 by 8 decoder work?

Well it takes 3 inputs and multiplies them, basically with an 3 by 8 decoder you will get 2^3 outputs. So you are trying to achieve this with a smaller 2 by 4 decoder which looks like this. Here you have 2 inputs, 4 outputs, 4 ANDs, 2 NOTs, each AND has 2 inputs. Now you have to think how can you turn 4 inputs into 3 to make this thing work.

How many outputs does a 2 by 4 decoder have?

In a 2 to 4 decoder you have 2 inputs and four outputs, In a 5 to 32 decoder you have 5 inputs and 32 outputs where only ONE is high. Use an enabled decoder when en=1 logic of decoder follows from input as shown in the above diagram, but when en=0 all outputs are at ZERO

How to make a 4×16 decoder using 2×4?

Connect A4 to 2 to 4 while the other input and EN are at One Use only top two outputs as YL, YH Connect A3 to A2 to two more 2 to 4 decoders with one get YL as EN call D432′ and other get YH as EN call D432 so one gets EIGHT outputs

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