A multiplexer selects one of two (or more) inputs based on a control input. It then outputs the selected input.

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31 views

“Tagging” Data traveling over serial port?

If I'm reading data from multiple channels (UART) of a microprocessor, but I want it to be continuously read, I imagine the logical thing to do would be to cycle through the channels and output data, ...
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43 views

VHDL - Issue with simulation of testbench - Modelsim PE Student 10.4

I'm very new to VHDL and got an issue with the simulation time in Modelsim PE Student Edition 10.4. I wrote some files for a RTL-model such as multiplexer, demultiplexer and register. To test my ...
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39 views

How to simulate this multiplexer in transistor level?

This is a schematic of a hazard-free multiplexer taken from B. Lin and S. Devadas, “Synthesis of hazard-free multilevel logic under multiple-input changes from binary decision diagrams,” IEEE ...
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69 views

Mux and Adder going into Infinite Loop

I have been trying to learn verilog with help of a project. The mix that takes adder output as input and gives input to adder as per the control signal is going into an infinite loop, but it should ...
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2answers
50 views

Solid state device for switching (muxing) a bipolar high current signal

I'm looking into solid state relays for an application where I need to switch between two different transducers to allow two different modes of operation for an echo sounder. Basically a MUX that ...
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60 views

What is Vee on a 74hc4051 mux? [duplicate]

The 74HC4051 Mux (spec is here: http://www.nxp.com/documents/data_sheet/74HC_HCT4051.pdf) has 8 input/output pins labelled Y, one output/input pin labelled Z, three digital selectors S0, S1, S2, and ...
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34 views

Multiplexer with enable at a karnaugh map

We have multiplexer 2->1 with reverse enable: (sorry for the child-like graphics) the function table is the following e c Y 1 X 0 0 0 x0 0 1 x1 I tried to make a karnaugh map, ...
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43 views

Boolean expression of MUXs

I want to make sure I understand writing boolean expressions for MUXs. For F0, I derived the following boolean expression: \$\ F0 = S1’S2’(A’B + AB’)\$ from this circuit: Is this correct? If so, ...
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49 views

Boolean expression with MUX circuits

Let's say I have a 4:1 MUX circuit of inputs: C--->...............................output: F2 C'--->........4:1 MUX........ C' --->............................. C --->.................................
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3answers
90 views

Chain 16-channel analog multiplexer/demultiplexer

I'm trying to figure out how to chain six 74HC4067 or similar 16bit multiplexers. My goal is to read multiple analog inputs one after another with Arduino. I have only 1 analog pin input and 7 ...
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18 views

Implement 2 bit adder using 4:1 Multiplexer [duplicate]

How can i implement the 2 bit full adder using only 4: 1 multiplexers? I created a truth table for a two-bit full adder, which looks like this: I don't know how to do multiplexer folding and ...
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35 views

How do I use the CD4026 IC with a multiplexed 7-segment display?

I have 2 pcs. of 3 digit multiplexed 7-seg display (ELT-511SURWA) and 6 pcs of CD3026. I am building a frequency counter (CD4060 + crystal as timebase). I have considered using 6x UDN2983 + CD4017 + ...
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4answers
340 views

Making an ID of a board type

I want to make hardware ID of a board without using microcontroller or any kind of pre programmed eeprom. All boards of same type will have the same ID. One ID per board type. I was thinking of using ...
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1answer
43 views

Using BILATERAL SWITCH properly?

Summery: I am trying to figure out if I can use a bilateral switch as if it was a tiny relay capable of communicating UART signal, or are there things I am missing. Now, the long explanation. So, I ...
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1answer
100 views

Display Double Digit Numbers on 2 seven segment displays

I'm making an Arithmetic Logic Unit(ALU) for an assignment and I'm on a point. So according to my circuit design on the link shared below, I am able to output 1 digit of my alu. It is a 4 bit ALU so ...
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1answer
55 views

Correct 2 to 1 Multiplexer Truth Table

What is the correct way to write a 2 to 1 multiplexer truth table? In a couple of tutorials I've come across (1,2), the table is presented as follows: However, the same tutorials show the 4 to 1 ...
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45 views

Switch TENS unit between many channels

I would like to switch the output of a tens unit (one of those things that uses electricity for pain relief) to 8+ different outputs. I want to create an electro tactile device. The idea is to switch ...
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1answer
83 views

NPN or PNP for multiplex seven segment display?

I want to put three multiplexed seven segment displays on a pcb module which then will be connected to another board through a 1x12 Pin header housing an ATMega (so assume in the following that Pin 11 ...
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1answer
52 views

Interface 10 image sensors to Linux CPU

I need to process image data from 10 image sensors simultaneously (namely from OnSemi MT9V022s or similar). All 10 sensors will be externally triggered by a common signal. Ideal solution would be to ...
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1answer
56 views

MOSFET ORing behaving differently with fast slew rate on one of the Input rails

I am giving more details about the problem . pls read patiently. we are using p-MOSFET's ORing to do automatic switchover b/w @ 12V_External (comes from PCIE edge) and emergency battery. The circuit ...
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2answers
97 views

Is it possible to read a 10 by 10 switch matrix with 8 by 8 I/O pins?

I was asked this question on an interview: given 8 output pins and 8 input pins on a microcontroller, is it possible to read a 10 by 10 switch matrix without using multiplexor and demultiplexor chips? ...
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1answer
92 views

Assign I²C address to multiple devices on the same bus

I've got a couple of ADCs on the same I²C bus, which all default to the same address. My first instinct tells me to use an I²C multiplexer like the TCA9544A but that would require sending a byte to ...
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45 views

Constructing 16-1 Multiplexer from four 4-1 Multiplexers and a 2-4 Decoder

I have to show how to construct 16-1 Multiplexer from four 4-1 Multiplexers and a 2-4 Decoder. I tried creating 8-1 MUX from two 4-1 MUXes (using enable pin), but have no clue how to stack more MUXes ...
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40 views

Ideal multiplexers

I need thorough tests on different voltage biasing of an analog design. I figure all I just need to generate all combination of conditions (mostly voltage levels, some frequency) and port ...
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66 views

How does the OR gate work?

I'm asking this in reference to multiplexers where there are multiple inputs to the final OR gate. Say I have two different signals to an OR gate. One is at 4V and the other at 5V. So if I'm letting ...
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97 views

Did I hook up this CD4052 Analog Multiplexer correctly?

Upon reading the data sheet this chip seems straight forward, but I'm having the hardest time hooking up the CD4052. The chip I'm using is actually a, "CD4052BE". Here is a link to the datasheet. I ...
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75 views

Multiplexing 2 times 4 CC RGB LED's

I need to make 2 sets of 4 Common Cathode RGB LEDS. In each set of 4, every led must be individually addressable. It doesn't matter if both sets have duplicate outputs or not. (Although optimally they ...
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135 views

analog multiplexer CD4051BE

I want to test the analog inputs of a CD4051BE multiplexer, so I created four voltage dividers in order to measure four different values of analog input. I connected them to the I/O0 - I/O3 ports of ...
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2answers
35 views

2-to-1 Multiplexer logic equation: is order of inputs important?

The boolean logic equation for a 2-to-1 multiplexer is \$(A.\bar{S})+(B.S)\$, where \$A\$ is the first input and \$B\$ is the second input. Is this logic equation equivalent to \$(A.S)+(B.\bar{S})\$, ...
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35 views

OFDM with CSMA/CA

Most Wifi standards (e.g. 802.11a) use OFDM for orthogonal frequency multiplexing, i.e. assigning different subcarriers/frequencies to different users. On the other hand, it says CSMA/CA is used to ...
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57 views

Switching Serial Connections among several devices?

I have 3 devices that communicate via a serial port. Let's call them Device 1, Device 2, and Bluetooth (BT to serial adapter). The BT is used to communicate with a computer, but it can be treated just ...
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52 views

Multi-channel high frequency signal acquisition

I have to design a test bench for a device that has more than 1000 outputs. The voltage of these outputs will be about 10mV peak-to-peak, the frequency will be in the range of 100MHz (for the carrier) ...
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55 views

Is it possible to multiplex the same frequency (without bandwidth division)?

I have a range of bandwidth (e.g. [865,868] MHz) and more than one RFID tag I'd like to receive information from, over that range. How could I multiplex those ...
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156 views

7-1 Multiplexer Inputs

I'm a computer science student taking a required Computer Organization course so I'm very new to this electrical engineering stuff. I want to know how does one construct a 7-1 multiplexer? I know the ...
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2answers
79 views

multiplexing control signal on speaker cable

I need to put an alarm siren close to the location of one of my audio speakers. But I don't have a dedicated cable towards this siren. Because the alarm control unit is close to my speaker amplifier I ...
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89 views

TCA9548A I2C Multiplexer - 10k resistors on the address lines

I'm looking over the schematics and PCB layout of the Adafruit TCA9548A I2C Multiplexer breakout board. I've attached the schematic below. I cannot figure out why there are 10k resistors on the A2,A1,...
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52 views

Multiplexer with 5v select and 9v or more routing

I need to route a 9v signal using a 5v or 3.3v microcontroller. Does anybody know of a multiplexer that supports this, or a circuit it could put in between the microcontroller and the multiplexer to ...
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1answer
27 views

Implementing a function using a mux and no gates at all

Given the function \$f(w,x,y,z)=x'y'z'+w'xy' \$, where \$ '\$ means negation. I was given this function from a mux \$2^3*3\$ - 8 inputs and 3 control lines. In the original implementation \$y'\$ was ...
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47 views

easy way to switch a signal

I have below configuration: ...
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73 views

74HC4051 Analog multiplexer settling time

I have simple schematic for multiplexing single ADC input to multiple analog inputs, made from LMV934 buffer and 74HC4051 analog multiplexer. The problem is, after selecting desired analog input, ...
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1answer
50 views

3 variable Kmap into 2-1 Mux

I am trying to figure out if I implemented a 2-1 Mux correctly based on a 3 variable K-map. my function states F(x,y,z)= Σm(0,1,3,6), and I have created a kmap as follows ...
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38 views

tradeoff of implementing MUX with some tristate buffers rather than AND OR logic?

Does anyone know the tradeoff of implementing MUX with some tristate buffers rather than AND OR logic? I know that one of the advantages of using tristate buffer is that it is easier to distribute ...
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186 views

What is the minimum size of multiplexer needed to implement any boolean function of n variables if we are given a multiplexer and an inverter to use?

The following is the solution given. We can use n-1 selection lines , and using 0,1 and nth variable and its compliment to realize the function So ans is 2^(n-1):1 I'm unable to understand how ...
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4answers
95 views

Does an ALU always do add and sub, but only returns one of the results?

Pretty simple question. Does an ALU internally always do multiple operations like add, sub, div, mul, ... and you simply have to specify which result you want to return? I was told that it does that, ...
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1answer
85 views

Is NXP's PCA9548A compatible with TI's TCA9548A?

I am using TI's TCA9548A in my Projects, but I would like to know if I can substitute it with PCA9548A from NXP. By comparing the datasheets this seems to be indeed the case, but I am wondering why ...
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93 views

Programmable gain instrumentation amplifier with R-2R ladder and analog multiplexer

I want to build a programmable gain instrumentation amplifier with power of two possible gains (1x, 2x, 4x, 8x...). Is there a way to use a R-2R resistor ladder and an analog multiplexer in order to ...
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1answer
58 views

OrCad issue: Logic circuit simulation…ambiguous output

After simulating the following logic circuit(in OrCad),the resulting output -'y' is unclear. It seems to me that everything is fine, yet the result is ambiguous. Can you, please, explain what is the ...
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90 views

Set multiplexer inputs to a logic 1 state

How can I set, in Orcad, all the entries of multiplexer(in the picture) (except: 1, 13), to logic state '1' (for example, I understand that if I place 'ground' to some entry, then it will be ...
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2answers
40 views

Lenient MUX and Load Signal

https://www.youtube.com/watch?time_continue=25&v=d3bF2v056WU http://i.imgur.com/ipDYgd8.png I'm going to ask about some names. You could say "they are just names" but if I get some context for ...
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3answers
216 views

Why is the output (in the truth table) inverted in a ic 74154 used as a demux?

I am studying Digital Principles and Applications from Malvino and Leach. I have a doubt in the demultiplexer section. This is the image of a 1 to 16 demux. I understand how it works. So, if ABCD = ...