Decoder 74ls138

April 19, 2024 Post a Comment

Decoder 74ls138

The LSTTL/MSI SN54/74LS138 is a high speed 1-of-8 Decoder/ Demultiplexer. This device is ideally suited for high speed bipolar memory chip select address decoding.

How many decoders are there in IC 74LS138?

We take the popular 3 to 8 decoder Integrated Circuit 74138. The Integrated Circuit is of 16 pins. We have three input pins which are actively in high state and are classified as I2, I1 and I0. The outputs are actively in low state and are eight in number and are classified as O7*, O6*, …, O0*.

Why IC 74138 is also called as decoder?

The IC 74LS138 is a 3 to 8 line decoder integrated circuit from the 74xx family. The main function of this IC is to decode otherwise demultiplex the applications. The decoder 74LS138 IC uses advanced technology like silicon (Si) gate TTL technology. 74LS138 IC has 3 binary select inputs like A, B & C.

How does a 74LS138 work?

74LS138 is a complex TTL based logical device used to convert 3-bit binary data to 8-bits. The actual purpose of this chip is designed for demultiplexing or in machine language we can say as a decoding device. The device takes 3 input data and converts it to 8-bit data.

What is decoder used for?

A decoder is a device that generates the original signal as output from the coded input signal and converts n lines of input into 2n lines of output. An AND gate can be used as the basic decoding element because it produces a high output only when all inputs are high.

What is decoder and how it works?

A decoder is a combinational logic circuit that is used to change the code into a set of signals. It is the reverse process of an encoder. A decoder circuit takes multiple inputs and gives multiple outputs. A decoder circuit takes binary data of 'n' inputs into '2^n' unique output.

What is name of IC 74LS138?

IC 74LS138 3-to-8 Line DECODER/DEMULTIPLEXER.

What are the types of decoders?

Decoder

2 to 4 line decoder: In the 2 to 4 line decoder, there is a total of three inputs, i.e., A₀, and A₁ and E and four outputs, i.e., Y₀, Y₁, Y₂, and Y₃.
3 to 8 line decoder: The 3 to 8 line decoder is also known as Binary to Octal Decoder. ...
4 to 16 line Decoder.

What IC is used for decoder?

A DTMF (Dual Tone Multi-Frequency) decoder IC is a device that receives data transmissions in amateur radio frequency bands.

How many types of decoder are there?

There are different types of decoders like 4, 8, and 16 decoders and the truth table of decoder depends upon a particular decoder chosen by the user. The subsequent description is about a 4-bit decoder and its truth table.

What is a 74138 used in?

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.

Why decoder is used in memory?

Memory decoders are needed to select the memory-specified input addresses from the memory unit. Here the memory cell plays a vital role in the process.

Which pin is LSB in 74LS138?

According to the rule of 74LS138, A is the low bit (LSB) and D is the high bit (MSB). The 74LS138 decoding output is low level effective.

What does a 74139 decoder do?

The SN74HC139 (74139) IC provides two individual 2-line to 4-line decoders in a single package. The decoders take as input a two digit binary number 1 thru 4 (00, 01, 10, 11) and output by selecting one of four lines.

What does a 4x16 decoder do?

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.

Can I use a decoder with a digital TV?

Do you want to watch digital TV, but doesn't your TV have a (suitable) built-in decoder? In that case, you need a separate digital decoder. This converts the signal from your TV provider into images that you can then watch on your TV. This device is also referred to as a set-top box or digital receiver.

What is decoder example?

Examples of this type of decoder include: A 3-to-8 line decoder activates one of eight output bits for each input value from 0 to 7 — the range of integer values that can be expressed in three bits. Similarly, a 4-to-16 line decoder activates one of 16 outputs for each 4-bit input in the integer range [0,15].

Why is it called a decoder?

A decoder is a circuit that changes a code into a set of signals. It is called a decoder because it does the reverse of encoding, but we will begin our study of encoders and decoders with decoders because they are simpler to design.

Why decoder is required?

Decoders are used when we need to input data to a specific output line. The most common application of this is in addressing core memory in a computer, where we have a specified memory location to store the input data. They are used in code conversions like binary to decimal, like the 2 to 4 decoder.

How does TV decoder work?

This is a hardware appliance that allows a digital signal to be received, decoded and displayed on a television. The signal can be a television signal or Internet data and is received via cable or telephone link. Set-top boxes deliver more channels than a television's own channel tally system.