What is the need of decoder make a 3/8 decoder using 2 to 4 decoder?
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. We can find the number of lower order decoders required for implementing higher order decoder using the following formula.
How many and gates are required to implement a 3 to 8 decoder with an enable?
three NOT gates
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.
How do you make a 3/8 decoder?
- 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 many 3 to 8 line decoders are required or used to construct a 6 to 64 line decoders?
For 64 outputs eight 3 to 8 decoders are required and to address (or select) each of them one more 3 to 8 decoders is required. The scheme to implement 6 to 64 decoders using nine 3 to 8 decoders is explained below.
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.
Which are the enable pins for 3/8 decoder?
The device takes 3 input data and converts it to 8-bit data. This chip is high used in decoding in memory to minimize the effect of decoding. The chip includes three enable pin, three input pins, and 8 output pins.
How many and gates are required for a 1 to 8 demultiplexer?
How many AND gates are required for a 1-to-8 multiplexer? Explanation: The number of AND gates required will be equal to the number of outputs in a demultiplexer, which are 8. Explanation: The output Y4 = Q2.
How many 3 to 8 line decoders with an enable output are needed to construct a 6 to 64 line decoder without using any other logic gates?
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.
How many 3 line to 8 line decoders are required for a 4 to 16 decoder assume that one inverter is also available?
Circuit Design of 4 to 16 Decoder Using 3 to 8 Decoder 4 to 16 decoder circuit is obtained from two 3 to 8 decoder circuits or three 2 to 4 decoder circuits.
How many 3-to-8 line decoders with an enable output are needed to construct a 6 to 64 line decoder without using any other logic gates?
How many two input AND and OR gates are required to Realise Y is equal to CD CA ji?
Explanation: to realize y = cd + ef + g, two and gates are required and two or gates are required.
How do I use IC 74138?
74LS138 is used in de-multiplexing applications by using enable pin as data input pin. Also the chip inputs are clamped with high-performance Schottky diodes to suppress line-ringing and simplify system design….74LS138 Pin configuration.
| Pin | Name | Description |
|---|---|---|
| 15 | Y0 | Output pin 0 |
| 16 | VCC | Power supply pin |
How to design a 3 by 8 decoder?
Previous answers explained clearly design of 3 by 8 decoder by using enable input pins of 2 by 4 decoders. However there is another way without using enable pins but with the help of some AND gates and NOT gate. This is just for your information. Let us label out input lines of the 3 to 8 as I0, I1 and I2, and our 8 outputs as Q0..Q7.
What is the function of A3 input in a decoder?
Here the compliment of A3 is given to enable the pin of the decoder to obtain the outputs like Y7 to Y0. These outputs are lower 8 minterms. In the above decoder, the A3 input is connected to enable the pin to obtain the outputs from Y15 – Y8.
How many output lines does a 3 line decoder generate?
If enable is zero, afterward all the decoder’s outputs will be equivalent to zero. 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.
What is the decoder value of a3a2a1a0?
So, when A 3 A 2 A 1 A 0 = 0 X X X, lower decoder will be enabled and depending on value of A 2 A 1 A 0 outputs will be Y 0 to Y 7. When A 3 A 2 A 1 A 0 = 1 X X X, upper decoder will be enabled and depending on value of A 2 A 1 A 0 outputs will be Y 8 to Y 15. Become an expert in Kotlin while creating applications.
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