1 Of 8 Decoder Logic Diagram

The below figure shows the block diagram of a 1 to 8 demultiplexer that consists of single input d three select inputs s2 s1 and s0 and eight outputs from y0 to y7. The parallel inputs a 2 a 1 a 0 are applied to each 3 to 8 decoder. This decoder circuit gives 8 logic outputs for 3 inputs and has a enable pin.

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1 to 2 demux 3 line to 8 line decoder.

1 of 8 decoder logic diagram. 74hct139 dual 2 to 4 line decoder demultiplexer rev. In a similar fashion a 3 to 8 line decoder can be made from a 1 to 2 line decoder and a 2 to 4 line decoder and a 4 to 16 line decoder can be made from two 2 to 4 line decoders. Functional diagram fig 1. 4 11 december 2015 product data sheet type number package.

You can clearly see the logic diagram is developed using the and gates and the not gates. It takes 3 binary inputs and activates one of the eight outputs. The complement of input a3 is connected to enable e of lower 3 to 8 decoder in order to get the outputs y 7 to y 0. The multiple input enables allow parallel ex pansion to a 1 of 24 decoder using just three ls138 devices or to a 1 of 32 decoder using four ls138s and one inverter.

Sonali deo 7 343 views. 1 8 7 6 a0 cs2 a2 a1 y7 cs1 cs3 gnd y3 y2 y1 y0 vcc y5 y4 y6 figure 2. 74138 decoder ic 3 to 8 decoder pin diagram 74138 working of 74138 why 74138 have 3 enable pin duration. The inputs are represented by x y and z while the compliments are.

An alternate circuit for the 2 to 4 line decoder is. Logic symbol fig 2. It is convenient to use an and gate as the basic decoding element for the output because it produces a high or logic 1 output only when all of its inputs are logic 1. Mc74hc238a 1 of 8 decoder demultiplexer.

The block diagram of 4 to 16 decoder using 3 to 8 decoders is shown in the following figure. Functional diagram ddd ddd. It is also called as 3 to 8 demultiplexer due to three select input lines. Logic diagram of 3 to 8 decoder.

Expanded logic diagram figure 7. This device is ideally suited for high speed bipolar memory chip select address decoding. This is also called a 1 of 8 decoder since only one of eight output lines is high for a particular input combination. The lsttl msi sn54 74ls138 is a high speed 1 of 8 decoder demultiplexer.

3 to 8 line decoder circuit is also called as binary to an octal decoder. Replacing the 1 to 2 decoders with their circuits will show that both circuits are equivalent. 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. The circuit is designed with and and nand logic gates.

Dimensioning and tolerancing per ansi. 3 to 8 line decoder has a memory of 8 stages.