What is enable input in decoder?
What is enable input in decoder?
A Decoder with Enable input can function as a demultiplexer. A demultiplexer is a circuit that receives information from a single line and directs it to one of. possible output lines. A demultiplexer receives as input, selection lines and one Input line.
How many enable line are available in 2 to 4 line decoder?
We have seen that a 2-to-4 line binary decoder (TTL 74155) can be used for decoding any 2-bit binary code to provide four outputs, one for each possible input combination.
What are the 2 input ICS required to design 2/4 line decoder?
2 to 4 Line Decoder Truth Table. In this type of decoders, decoders have two inputs namely A0, A1, and four outputs denoted by D0, D1, D2, and D3.
How many inputs are required for a decoder with 4 outputs?
Practical decoder circuits are usually built as 2:4 decoders with 2 inputs and 22 (4) outputs, 3:8 decoders with 3 inputs and 23 (8) outputs, or 4:16 decoders with 4 inputs 24 (16) outputs. A decoder circuit requires one AND gate to drive each output, and each AND gate decodes a particular binary number.
What is enable input?
NOTE A chip-enable input is a clock or strobe input that significantly affects the power dissipation of the integrated circuit. For example, it may be the cycle control input of a dynamic memory or a power-reduction input of a static memory.
How many 2-to-4 line decoders with an enable input are required to construct a 4 to 16 line decoder without using any other logic gates?
Four 2*4 encoders are required to produce 16 outputs and 1 extra 2*4 decoder is required to enable the decoder when creating 4*16 decoders….Implement 8:1 mux using 4:1 mux.
| ABCD Input Lines | Decoder Enabled | Output Lines |
|---|---|---|
| 0101 | D2 Decoder | Y5 |
| 0110 | D2 Decoder | Y6 |
| 0111 | D2 Decoder | Y7 |
| 1000 | D3 Decoder | Y8 |
How many 2-to-4 line decoders with an enable input are needed to construct a 7 to 128 line decoder without using any other logic gates?
hence required decoders (from fig.) = 9 so ans is ( C) part. Article Tags : GATE-CS-2007.
What is a 2-to-4 line decoder?
The 2-to-4 line binary decoder depicted above consists of an array of four AND gates. The 2 binary inputs labelled A and B are decoded into one of 4 outputs, hence the description of 2-to-4 binary decoder. Each output represents one of the minterms of the 2 input variables, (each output = a minterm).
What is an enable line?
An Enable will allow an input signal, shown in green, to pass the output, shown in red, when the control signal is high. It will prevent a signal from passing when the control signal is switched to low.
