The 1 to4 demultiplexer has 1 input bit, 2 control bit, and 4 output bits. Dual 1of4 decoderdemultiplexer general description the acact9 is a highspeed, dual 1of4 decoder demultiplexer. Demultiplexers combinational logic functions electronics. The outputs of upper 1x8 demultiplexer are y 15 to y 8 and the outputs of lower 1x8 demultiplexer are y 7 to y 0. Acceptable values are 2, 4, 8, and 16 and the corresponding select input widths are 1, 2, 3, and 4. Sep 04, 2015 a demultiplexer is a circuit with one input and many output. This demultiplexer is also called as a 2 to 4 demultiplexer which means that two select lines and 4. Features and benefits hef4555b dd, vss, or another input. A 2to4 line decoder implemented using a 1of4 demultiplexer is shown in fig. Gate cmos the mc74hc238a is identical in pinout to the ls238. And if the outputs are 8 in number it can be termed as 1. The device features two input enable e0 and e1 inputs. The function of the demultiplexer is to switch one common data input line to any one of the 4 output data lines a to d in our example above.
Thus, depending on the number of the outputs the demultiplexer is termed. The multiple input enables allow parallel expansion to a 1of24 decoder using just three ls8 devices or to a 1of32. It decodes four binary weighted address inputs a0 to a3 to sixteen mutually exclusive outputs y0 to y15. Another type of demultiplexer is the 24pin, 74ls154 which is a 4 bit to 16line demultiplexer decoder. The demultiplexer provides the following parameters. A 1 to 2 demultiplexer uses 1 select line s to determine which one of the 2 outputs y0, y1 is routed from the input d.
Dandamudi, fundamentals of computer organization and design, springer, 2003. Maemo relay is a gui application build on the top of qt4. Each decoder has an activelow enable input which can be used as a data input for a 4output. Few types of demultiplexer are 1to 2, 1to4, 1to8 and 1to 16 demultiplexer. Note that an activelow device would have the and gates. Thus, demultiplexers play a crucial role in the communication system. Demultiplexer takes one single input data line, and then switches it to any one of the output line. The 1 to 4 demultiplexer has 1 input bit, 2 control bit, and 4 output bits.
A 1to4 demultiplexer can easily be built from 1to2 demultiplexers as follows. The two 4to1 multiplexer outputs are fed into the 2to1 with the selector pins on the 4to1s put in parallel giving a total number of selector inputs to 3, which is equivalent to an 8, demultiplexer the nl7sz19 is a 1to2 decoder. Multiplexer and demultiplexer circuit diagrams and. Features and benefits hef4555b dd, vss, or another. Gate cmos the mc74hc9a is identical in pinout to the ls9. The select inputs are used to specify the input channel that is to be connected to the output pins. General description the hef4555b contains two 1 of 4 decoders demultiplexers. The demultiplexer is also called as data distributors as it requires one input, 3 selected lines and 8 outputs. A 1 to 4 demultiplexer has a single input d, two selection lines s1 and s0 and four outputs y0 to y3. Cbt3253a dual 1 of 4 fet multiplexerdemultiplexer rev.
Each decoder has an activelow enable input which can be used as a data input for a 4 output. This device is ideally suited for high speed bipolar memory chip select address decoding. The demultiplexer section channel a accepts a single differential input and generates two parallel differential outputs. The max3882a is a deserializer combined with clock and data recovery and limiting amplifier ideal for converting 2. The device accepts serial nrz input data as low as 10mv pp of 2.
Its circuit is or by expressing the circuit as shows that it could be two onebit 1to2 demultiplexers without changing its expected behavior. Oct 25, 2018 74hc4051 datasheet multiplexer demultiplexer, pdf, pinout, equivalent, replacement, schematic, manual, data, circuit, parts, datasheet. The device inputs are compatible with standard cmos outputs. You can do this in two different ways and it is shown in the image.
For example, an 8to1 multiplexer can be made with two 4to1 and one 2to1 multiplexers. Each has two address inputs na0 and na1, an active low enable input ne and four mutually exclusive outputs which are active high ny0 to ny3. This device has two independent decoders, each accepting two binary weighted inputs na0 and na1 and providing four mutually exclusive active low outputs ny0 to ny3. Few types of demultiplexer are 1 to 2, 1 to 4, 1 to 8 and 1 to 16 demultiplexer. If the output of the demultiplexer is 4 it can be termed as 1. Eachdecoder has an active low enable input which can be used as a data. To produce a decoder for the first four codes 0 to 3 requires a 2 to 4 decoder i. Click on the 1 to 4 demux sub circuit to see that it is made up of 3 cascading 1 to 2 demux. The boolean expression for this 1to4 demultiplexer above with outputs a to d and data select lines a, b is given as. The outputs of upper 1x4 demultiplexer are y 7 to y 4 and the outputs of lower 1x4 demultiplexer are y 3 to y 0. Device information1 part number package body size nom sn74cbtlv3253d soic 16 9. General description the hef4555b contains two 1of4 decodersdemultiplexers. Mux directs one of the inputs to its output line by using a control bit word selection line to its select lines. Demultiplexer pin diagram understanding 1 to4 demultiplexer.
On the contrary, the decoder is a combinational circuit which can accept many inputs and generate the decoded output. Its a mpeg 1 2 stream relay as well as mpeg 1 2 file audio video demultiplexer and streamer. The demultiplexer converts a serial data signal at the input to a parallel data at its output lines as shown below. Difference between decoder and demultiplexer difference. A high on either of the input enables forces the outputs high. We can implement 1x8 demultiplexer using lower order multiplexers easily by considering the above truth table. Note that the first four codes have a b 0 so these two inputs are not needed. Sep 04, 2017 you can do this in two different ways and it is shown in the image. This demultiplexer is also called as a 2to4 demultiplexer which means that two select lines and 4. The main difference between demultiplexer and decoder is that a demultiplexer is a combinational circuit which accepts only one input and directs it into one of the several outputs.
The hef4556b is a dual 1 of 4 decoder demultiplexer. Dual 1 of 4 decoderdemultiplexer general description the acact9 is a highspeed, dual 1 of 4 decoder demultiplexer. By applying control signal, we can steer any input to the output. This file is made available under the creative commons cc0 1. Dual 2to4 line decoderdemultiplexer 74hchct9 ac waveforms package outlines see 74hchcthcuhcmos logic package outlines. Sn74cbtlv3253 lowvoltage dual 1of4 fet multiplexer. A demultiplexer transmits data from one line to 2n possible output lines, where the output line is determined by n select lines. The multiplexer section channel b accepts two differential inputs and generates a single differential output. A demultiplexer is a circuit with one input and many output. The device has two independent decoders, each accepting twoinputs and providing four mutually exclusive active low outputs. Get same day shipping, find new products every month, and feel confident with our low price guarantee. Multiplexers a multiplexers mux is a combinational logic component that has several inputs and only one output.
Demultiplexers, on the other hand, are classified into 14 demultiplexers, 18. This demultiplexer is also called as a 2 to4 demultiplexer which means that two select lines and 4. Multiplexer and demultiplexer circuit diagrams and applications. Nov 08, 2012 a demultiplexer is a combinational circuit which receives a binary information on a single line and it will be transmitted to one of 2n output lines based on n selection lines. As with the multiplexer the individual solid state switches are selected by the binary input address. Few types of demultiplexer are 1 to 2, 1 to4, 1 to8 and 1 to 16 demultiplexer. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
A demultiplexer is a combinational circuit which receives a binary information on a single line and it will be transmitted to one of 2n output lines based on. Typical decoderdemultiplexer ics might contain two 2to4 line circuits, a 3to8 line circuit, or a 4to16 line circuit. As with the multiplexer the individual solid state switches are selected by the binary input address code. Design a 1 to 4 demultiplexer to further your understanding of the circuit. Demultiplexer pin diagram understanding 1 to 4 demultiplexer. The 1to4 demultiplexer has 1 input bit, 2 control bit, and 4 output bits. The 74hc9 is a highspeed, dual 2to4 line decodermultiplexer.
Standard demultiplexer ic packages available are the ttl 74ls8 1 to 8output demultiplexer, the ttl 74ls9 dual 1 to 4 output demultiplexer or the cmos cd4514 1 to 16 output demultiplexer. Types of decoder and a demultiplexer decoders are generally categorized into 2to4 decoders, 3to8 decoders, and 4to16 decoders. Maemo relay is a gui application build on the top of qt 4. As an example, a device that passes one set of two signals among four signals is a twobit 1to2 demultiplexer. Numoutputterminals this parameter determines the number of demultiplexer outputs. Hef4556bp datasheet24 pages philips dual 1of4 decoder. Apr 15, 2019 74154 datasheet pdf 4line to 16line decoder demultiplexer, 74154 pdf, 74154 pinout, equivalent, 74154 schematic, dm74154, sn74154, ttl. An activehigh 2to4 line decoder implemented using a 1of4 demultiplexer. The device can be used as a 1to16 demultiplexer by. The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under law, including all related and neighboring rights, to the extent allowed by law. Lab 4 lmp model multiplexer and demultiplexer in embedded. The circuit to implement this using a demultiplexer is shown in fig. One exception to the binary nature of this circuit is the 4to10 line decoderdemultiplexer, which is intended to convert a bcd binary coded decimal input to an output in the 09 range. Each has two address inputs a 0 and a 1, an active low enable input e and four mutually exclusive outputs which.
A 1 to4 demultiplexer has a single input d, two selection lines s1 and s0 and four outputs y0 to y3. Following figure illustrate the general idea of a demultiplexer with 1 input signal, m control signals, and n output signals. This video is highly rated by electrical engineering ee students and has been viewed 39 times. The input data goes to any one of the four outputs at a given time for a particular combination of select lines.
The device has two independent decoders, each accepting two inputs and providing four mutuallyexclusive activelow outputs. Mc74hc9ad mc74hc9a dual 1of4 decoder demultiplexer high. A 1to4 demultiplexer has a single input d, two selection lines s1 and s0 and four outputs y0 to y3. The other selection line, s 3 is applied to 1x2 demultiplexer. Lab 4 lmp model multiplexer and demultiplexer in embedded system implemented by fpgas a multiplexer is a device that acts like a selector switch for digital signals. Feb 05, 2017 block diagram, truth table, working and logic diagram of 1 to 4 demultiplexer.