Decoder 74138

June 26, 2024 Post a Comment

Decoder 74138

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.

What is the output for IC 74138?

The outputs are actively in low state and are eight in number and are classified as O7*, O6*, …, O0*. A power supply of +5 V DC is needed by the chip and is Grounded.

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.

How many enable lines are there in 3x8 decoder IC 74138?

It comes up with three enable pins that simplifies the device for inputs from cascading and data reception problems. It is designed with Schottky clamped diodes for High performance.

Which IC is used for decoder?

3 to 8 line decoder IC 74HC238 is used as a decoder/ demultiplexer. 3 to 8 line decoder demultiplexer is a combinational circuit that can be used as both a decoder and a demultiplexer. IC 74HC238 decodes three binary address inputs (A0, A1, A2) into eight outputs (Y0 to Y7). The device also has three Enable pins.

What is decoder IC?

What are Decoders? Decoders are digital ICs which are used for decoding. In other words, the decoders decrypt or obtain the actual data from the received code, i.e. convert the binary input at its input to a form, which is reflected at its output. It consists of n input lines and 2^n output lines.

Why do we only use ABC for the 74138?

The data output 0 of the '138 is connected to the buffers, so according to the truth table we need ABC to be low in order to connect to the buffers.

What does a decoder output?

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.

How many IC is used for decoder?

In this tutorial, a 2-to-4-line decoder will be constructed using 7404 IC for NOT gates and 7411 IC for AND gates. Similarly an encoder can be constructed using OR gate, AND gate and NOT gates. Here, a 4-to-2-line encoder is constructed using 7404 IC for NOT gate, 7408 IC for AND gate and 7432 IC for OR gate.

Where is decoder used?

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.

Why are decoder used?

The decoder is an electronic device that is used to convert a digital signal to an analog signal. It allows a single input line and produces multiple output lines. The decoders are used in many communication projects that are used to communicate between two devices.

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.

How many demultiplexers are there in IC 74138?

74LS138 - 3 to 8 Decoder De-Multiplexer IC The LS138 can be used as an 8- output demultiplexer by using one active LOW Enable input as data input & the other Enable inputs as strobes. The IC has an operating voltage from 1.0V to 5.5V with a low power consumption of 32mW. The propagation delay is around 21nS.

What is a 3 to 8 line decoder?

3 to 8 line decoder: The 3 to 8 line decoder is also known as Binary to Octal Decoder. In a 3 to 8 line decoder, there is a total of eight outputs, i.e., Y0, Y1, Y2, Y3, Y4, Y5, Y6, and Y7 and three outputs, i.e., A0, A1, and A2. This circuit has an enable input 'E'.

How many outputs does a 3x8 decoder have?

A 3 to 8 decoder has three inputs (A, B, C) and eight outputs (D0 to D7). Based on the 3 inputs one of the eight outputs is selected. The truth table for 3 to 8 decoder is shown in the below table.

What is decoder type?

Decoder is a combinational circuit that has 'n' input lines and maximum of 2n output lines. One of these outputs will be active High based on the combination of inputs present, when the decoder is enabled. That means decoder detects a particular code.

What is IC 74148?

74HC148 is a 16 Pin 8-Line to 3-Line Priority Encoder IC having 2V to 6V Operating Voltage range with 5.2mA output current and low power consumption. It encodes Eight Data Lines to 3-Line Binary. It features priority decoding of the inputs to ensure that only the highest-order data line is encoded.

What is a 1 to 2 decoder?

1-to-2 Decoder (De-Multiplexer) The opposite of a multiplexer is a de-multiplexer, also called a demux or decoder. A demux allows a single input line to be passed through to multiple output lines, again using a select line to choose which output the input goes to.

Is IC 74138 active high decoder?

The decoder 74LS138 IC uses advanced technology like silicon (Si) gate TTL technology. These are suitable for different applications like memory address decoding otherwise data routing. These applications will feature high-noise resistance & low power utilization typically allied with TTL circuitry.

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.