How many 2 to 4 decoders are needed to implement an 4 to 16 decoder note all the decoders have an enable input?
How many 2 to 4 decoders are needed to implement an 4 to 16 decoder note all the decoders have an enable input?
If we are really talking about 74139 style 2 line to 4 line decoders you need 5 of them. Four provide the 16 outputs and the fifth one selects which of the first 4 is active. Of course you can provide the equivalent of the fifth decoder using jellybeans, but why bother? Update: you need 5 decoders.
How many inputs are needed for a 4 16 decoder?
Explanation: A binary decoder is a combinational logic circuit which decodes binary information from n-inputs to a maximum of 2n outputs. Here, number of outputs = 16. 16 = 24 = 2n. Thus, number of inputs is 4.
How many outputs does a 4/16 decoder have?
2*4 Decoder has two input lines and four output lines, and it chooses one of the lines based on various input combinations. 4*16 Decoder has four inputs and sixteen outputs, and it chooses one line based on various input combinations.
What is a 4/16 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.
How do you make a 4/16 line 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. When enable pin is high at one 3 to 8 decoder circuits then it is low at another 3 to 8 decoder circuit.
How to implement 4 x 16 decoder using 2 x 4 decoder?
The implementation of 4 X 16 decoder using 2 X 4 decoder is as shown below. If enable pin of first decoder is disabled all outputs will be inactive (say all 0). If it is enabled, depending on values of inputs A B, one by one decoders from top to bottom will be enabled as shown in following table.
How many input lines does a 2-by-4 decoder have?
A 2 -by- 4 decoder has two input lines and four output lines, only one of which is logical 1 at any time. Which line is 1 depends on the input bit pair which can be 00, 01, 10, 11. So take two such 2 -by- 4 decoders which give you four input lines. Let the output lines be a 0, a 1, a 2, a 3 for one decoder and b 0, b 1, b 2, b 3 for the other.
How many decoders and gates are there in a 4-by-16 circuit?
In other words, we have a 4 -by- 16 decoder constructed from two 2 -by- 4 decoders and 16 AND gates. The question does not prohibit use of logic other than decoders so using 16 2-input and gates we have the following circuit that fulfils the requirement (Muzammal Baig)
Is it possible to convert a 3-bit decoder to a 2-4 bit decoder?
It seems like it is possible where you take the low 3 bits to 2 3–8 decoders and you use the 2–4 decoder outputs as an enable. Connect the MSB to both inputs of the 2–4 and connect output 0 to the lower 3–8 decoder enable and output 3 to the upper.
https://www.youtube.com/watch?v=_xCZ21Z3sQo
