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Questions tagged [integrated-circuit]

An integrated circuit (IC) is an electronic circuit built onto a single plate of a semiconductor material, normally silicon. Modern ICs may contain billions of transistors and they have played a major part in the miniaturization and performance improvements of modern electronic systems.

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16 views

Would this shift register schematic avoid master/slave if I extended it to four billion bits?

simulate this circuit – Schematic created using CircuitLab The basic data structure for the machine I want to build is a shift register. Quite some time back someone told me that if I could ...
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54 views

Pull down through LED

I've built my own version of 8-bit computer based on various examples in the Internet. Once built I started to face some issue with unpredictable memory changes when it was not supposed to. After I'd ...
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31 views

TLP281-4 optoisolator circuit question

I am working with TLP281-4 optoisolator, there is a board which used this IC in it. It connected like this: Why can't I connect 5V to the collector and take the output directly from between emitter ...
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49 views

What's the difference between a LM3302N, TLC373CP, and LT1101CN8?

So I’ve got an LM3302N (IC COMPARATOR QUAD DIFF 14-DIP), LT1011CN8 (IC VOLTAGE COMPARATOR 5-V 8-DIP), and a TLC373CP (IC DUAL DIFF COMP 8-DIP) and I want to build a circuit inspired of the “1 minute ...
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38 views

How do I convert a microSD to a USB pen drive [on hold]

As a first circuit board project I decided to make a MicroSD to USB pen drive but I am struggling to create a schematic for the pcb. The problem I am running into is figuring out what I need as far as ...
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29 views

Charge and power distribution circuit with multiple batteries

I’m looking for solution for electric vehicle charge and power distribution system PCB. For some reasons I want to split battery to several Li-Ion packs in separated units (hulls). I see the next ...
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1answer
262 views

i would like to Identify an IC with top marking MQ1CE

I would like to identify an IC named MQ1CE. I hope this is a micro controller. Searching the internet I have got several answers such as a micro-controller, a knee-slapper (I don't know what that is),...
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23 views

How to characterize a lower node transistor?

I am a fresh college graduate and have recently started working as analog design engineer. I am working on 22nm FDSOI technology, And characterizing this device has been trouble for me. The device is ...
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1k views

How does it work when multiple companies sell the same IC? [on hold]

Very common ICs are sold by many manufacturers, for example let's say the TL07x range (which is vintage, but does demonstrate the case). Inspecting datasheets of two manufacturers, TI and Diodes Inc,...
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32 views

ADC input with Low pass RC filter

I’m trying to implement 8 bit ADC in FPGA. FPGA running at 100MHz clock. PWM signal is given to RC filter. Knowing that f=1/2piRC, I have trouble with choosing the component's value. Is there any ...
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73 views

6-pin SMD identification - top marking B7 AP

I am trying to repair a Garmin Echo fishfinder after moisture got into it, I have replaced the op amp but it seems the 6-pin device above it is also faulty. The trouble is I can't identify what it is. ...
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47 views

touch sensor for metal door handle

I was thinking if a current is applied to a metal door handled and somebody touched it that should complete the circuit to ground and be detectable but I'm not sure if this would work as the 'somebody'...
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1answer
235 views

ICL7107 not working on breadboard?

I am building a very simple thermometer circuit on breadboard, based around the ICL7107. The 7-segment LED display I am using is made up of 3x TOD5261BE-N displays. My intention was to make ...
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1answer
66 views

IC design future [closed]

Looking around me in the electronics industry I get the feeling more and more that core IC designing will eventually be replaced by micro controllers, Soc's and programming in C. Are there technical ...
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46 views

Can someone help me in getting to know what is wrong with my Frequency multiplier circuit using 565?

I just learned the working of NE565 and I tried to simulate a Frequency as multiplier using 565 in Proteus , but I don't know why PIN 4 of my NE565 is not giving any output . Its coming plane blank in ...
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58 views

Multiple voltage supplies to one IC

I have the TPL5010 functioning as a watchdog to an MCU. I have a 3.7V battery and a 5V voltage regulator on my board. I require the watchdog to be power by both sources and remain unaffected when ...
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66 views

Is it possible to desolder the bond wires by overheating a chip?

I was trying to solder some VQFN packaged chips for the first time using a hot air gun, because that's all I have. I set the temperature to rougly < 350°C and startet the process. Sometimes it ...
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1answer
137 views

What capacitor needs to be used for a circuit that limits the current?

I have the following circuit that is intended to limit the current that passes through diode D1 In this case, we can see on the graph that the current is limited at 5.31mA We can see on the graph ...
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1answer
55 views

Does melting microwires cause internal shorts

If you overheat a chip, you can melt the microwires attaching the wafer to the package. When this happens, can the melted microwires cause shorts between the pins of the chip, inside the package of ...
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Amount of Decoupling Capacitance in Integrated Circuit Layouts

When doing integrated circuit layouts, how does one pick the amount and value of the decoupling capacitance ? When doing over 10GHz designs, I typically EM simulate the supply line and use the ...
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1answer
90 views

How do I use one output to block an input until that output turns off?

I have a device with two inputs, each with an associated output. I require a means of allowing only one input-output circuit to be active at a time. If a second input is activated while the other is ...
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1answer
56 views

Replacing switch without transistors

I have a little keyfob style remote that I want to mod. It runs on a 3 volt button cell. I want to control the three switches with an ESP8266. The switches are connected to ground, and directly to a ...
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26 views

4 bit synchronous binary counter using T flip-flops

I'm trying to make a 4 bit synchronous counter using T FF. I managed to draw the excitation table and evaluated the functions but I'm unsure what the pin configurations will be. I tried connecting the ...
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1answer
93 views

How are microchip transistors different from larger transistors?

I've watched several programs which explain the fabrication of microchips essentially similar to developing film to the layperson. There is a silicon wafer, a special designed mask, and then light is ...
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1answer
56 views

Should I ground the unused pins of an oscillator crystal?

I have seen in this example circuit of an RTC where the unused legs of an oscillator crystal are grounded. I will be using an ECS EXC SMD crystal and from what I thought the unused pins are better ...
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3answers
138 views

How do they make photo lithography lens so accurate?

How are the lenses and other apparatus required for projecting a miniaturized version of the circuit using photo lithographic technique for IC manfuacture made? Its known that even the tiniest spec ...
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2answers
166 views

How do I efficiently search for ICs? [closed]

I am a computer engineering student with an electronics background (i.e. mandatory circuit design and analog electronic courses) and my degree thesis requires me to design an electronics project. So ...
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1answer
39 views

1 TTL IC -> inverter + 2-input NAND + 3-input NAND

I came across this question in my homework: Implement the following gates using only one TTL IC: one inverter, one 2-input NAND and one 3-input NAND. The type of IC they're talking about has 14 ...
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1answer
56 views

MOSFET as a Capacitor in IC

I was reading in a book that it is often possible to realize a certain capacitance in Integrated Circuits by exploiting the Gate Capacitance of a MOSFET. I read that the main disadvantage of this ...
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1answer
56 views

Transistors and Diodes maximum current per size

As you can understand my knowledge in electronics is limited. I am trying to find throughout the internet a way to find the maximum current I can put through a transistor or diode versus their size. ...
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1answer
53 views

How can I control the connection/disconnection of 8 bi-directional logic level lines, one 5V-50mA power, and a ground line with one SPST switch?

Using a single SPST switch, is there an IC (or other device) that can act as a relay for 10 individual circuits? 8 Logic level bi-directional lines, one 5V-50mA power, and one ground. I considered ...
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1answer
47 views

Charging a 4.4v lithium polymer battery with 5v?

Can anybody tell me how can i charge a 4.4v lithium poly. battery. I have a tp4056 charging circuit, but the problem is that it stops charging at 4.2v. I have searched on Ali but haven't found any 4.4 ...
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2answers
265 views

How Replica Feedback bias circuit rejects supply noise?

I attached the circuit diagram along with a short description of its working principle. However, it's not clear how the circuit rejects supply noise. It will be great if someone can brief about what ...
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30 views

Reverse Feedback protection in a RC circuit

I have been working on a model CPU build from LS TTL ICs for the past couple of weeks. I am going to give a little background here, during the prototyping I stumbled upon several intresting issues ...
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1answer
38 views

Problems with DRV103 PWM

I've been doing some work lately with the DRV103 IC by Texas Instruments (datasheet here, essentially it creates a PWM signal of variable duty cycle and frequency, preceded by an 'ON' signal of ...
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23 views

Battery Charger IC for Li-Ion charging via USB, which automatically determines the highest current available via VBUS

I am looking for an IC for charging a single Li-Ion battery via USB with the highest possible current available through the connected USB device (100mA up to 1A or 1.5A). The IC should not depend on ...
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41 views

Automatic power switching between two DC sources with a switch to charging in the second position

I am designing a circuit which will automatically switch to be powered by a single 18650 when the other voltage source is disconnected. It will use a DPDT switch, the second position of which will ...
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2answers
490 views

Adjusting the offset of the output of a UA741CN opamp

I've the following schematic for a UA741CN when there is NO offset: simulate this circuit – Schematic created using CircuitLab Question: Why do we need the diode and the two resistors to ...
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1answer
59 views

Is writing in FeRAM memory cell destructive?

I have read that writing in Ferroelectric random access memory is not destructive. But in a WL||PL memory architecture, if I try to write a '0' in a cell and the adjacent cell holds a '1', shouldn't ...
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1answer
62 views

Window comparator diode direction

What happens if we reverse the configuration of diode in window comparator? Will it remain a window comparator?
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Where Does VDD+0.3V Input Limit Come From on IC chips?

There are a variety of integrated circuits that specify that their input voltage can span a fairly wide (absolute maximum) range, e.g. -0.3V to 6.0V (ref, pdf page 4), and then have a "Input Voltage ...
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1answer
55 views

What is the scope of semiconductor device fabrication compared to other fields? [closed]

I am planning on applying to colleges for pursuing an MS degree. I would like to know the scope of semiconductor device modelling, both in terms of jobs as well as research. I also wish to know about ...
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3answers
112 views

What is meaning of active low input in combinational logic circuits?

I am currently doing self study on combinational logic circuits. I encountered few terms like active low output, active low input. I understood what active low output means (putting not gates at ...
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5answers
2k views

SMD IC mounted upside-down inside a drill hole for extreme low-profile requirements

I don't know if the title is descriptive enough, but I came across this PCB and could stop to wonder about its brilliant design. It is an aftermarket trigger controller for an airsoft gun that works ...
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1answer
228 views

Why the output voltage of this IC cannot reach higher?

I'm trying to design a remote control. But during the process of design, I found that the output voltage of IC TPS40057 of the switch can just reach to less than 6V. The simplified application diagram ...
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3answers
325 views

What material(s) are used in IC's as insulating layers between metal layers?

This question and the answers hits close to the topic. One picture shows it as SOD. Silicon-oxide dielectric? I'm aware that around/within the transistor, silicon oxide is grown for insulation where ...
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141 views

Why does the IC not respond (INA200)

The questions I have: Is the makeshift IC I use in the simulation a fair representation of the INA200? I assembled the circuit as shown in the picture (except for the current source and the LED) and ...
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2answers
82 views

Need a solution to sent i2c data long distance (prefereably convert to CAN)

Is there any IC available that can read I2C data from a sensor and convert to CAN. I was looking for a low-cost solution to reading i2c data and putting it on a CAN bus. Reading i2c with a ...