74138 Pinout

74138 is used to generate chip signals.

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.

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.

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.

Why do we need demultiplexers?

Demultiplexer is used to connect a single source to multiple destinations. The main application area of demultiplexer is communication system, where multiplexers are used. Most of the communication system are bidirectional i.e., they function in both ways (transmitting and receiving signals).

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'.

What is name of IC 74LS138?

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

What is the IC of not gate?

A NOT gate is used to output the Boolean inverse of the applied input. Hence the name 'Digital Inverter' or 'Inverting buffer'. The most commonly used NOT gate IC is the 7404.

What is IC 74139?

BD 1.300. 74LS138 is a member from '74xx'family of TTL logic gates. The chip is designed for decoding or de-multiplexing applications and comes with 3 inputs to 8 output setup.

What is the difference between 3/8 decoder and 4/16 decoder?

Similarly, 3 to 8 decoder produces eight min terms of three input variables A2, A1 & A0 and 4 to 16 decoder produces sixteen min terms of four input variables A3, A2, A1 & A0.

How many outputs of a 74138 decoder can be activated at any one time?

74LS138 is a member from '74xx'family of TTL logic gates. The chip is designed for decoding or de-multiplexing applications and comes with 3 inputs to 8 output setup.

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.

Why are demultiplexers called distributors?

Why is a demultiplexer called a data distributor? Explanation: A demultiplexer sends a single input to multiple outputs, depending on the select lines. For one input, the demultiplexer gives several outputs. That is why it is called a data distributor.

What is the difference between multiplexers and demultiplexers?

Multiplexer refers to a type of combinational circuit that accepts multiple inputs of data but provides only a single output. The demultiplexer refers to the type of combinational circuit that accepts just a single input but directs it through multiple outputs.

How do demultiplexers work?

The demultiplexer takes one single input data line and then switches it to any one of a number of individual output lines one at a time. The demultiplexer converts a serial data signal at the input to a parallel data at its output lines as shown below.

Are decoders and demultiplexers the same?

No. A Decoder decodes an encrypted input signal to multiple output signals from one format to another format. A De-Multiplexer routes an input signal to multiple output signals.

What are the advantages and disadvantages of MUX?

1] It reduces ckt complexity and cost. 2] We can implement many combinations logic ckts using multiplexer. 3] It does not need K-maps and simplification. 4] On the advance level the ability of MUX to switch directed s/g can be extended to smter video.

What is the purpose of MUX and decoder?

Multiplexer is a data selector which takes several inputs and gives a single output.In multiplexer we have 2n input lines and 1 output lines where n is the number of selection lines. 2. Decoder : Decoder is a logic circuit which n input lines into m output lines.

How many inputs and outputs do 3/8 line decoder has?

In 3 to 8 line decoder, it includes three inputs and eight outputs. Here the inputs are represented through A, B & C whereas the outputs are represented through D0, D1, D2… D7.

What is difference between decoder and encoder?

Encoder and Decoder are combinational logic circuits. One of the major differences between these two terminologies is that the encoder gives binary code as the output while the decoder receives binary code.