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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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2answers
68 views

Ground loop- Why would current flow between 2 earth grounds when signal return path offers the least impedance?

Lets say I have 2 ICs- C1 and C2 acting as driver and receiver for the digital signal. The signal is transmitted through a conductor/cable ( 2 wires) as shown below. I have 2 doubts 1. What would be ...
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0answers
28 views

Is it ok to put GND and VDD pours below IC (AS7265x)

I am designing a PCB to use with the AS7265x sensors. The datasheet states, on page 51: In order to prevent interference, avoid trace routing feedthroughs with exposure directly under the AS7265x ...
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0answers
36 views

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

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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28 views

What driver do I need for a 50w 30-36v 1500mA chip. 120v power supply [on hold]

It measures 24mmx44mm. I want to use it as a floodlight
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1answer
70 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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1answer
51 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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0answers
42 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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1answer
32 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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0answers
30 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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0answers
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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1answer
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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1answer
1k views

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

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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2answers
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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0answers
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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1answer
67 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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0answers
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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3answers
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
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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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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0answers
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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2answers
95 views

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
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
239 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
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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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
40 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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0answers
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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0answers
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 ...
1
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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 ...
1
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1answer
63 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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3answers
114 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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4answers
3k views

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 ...
2
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0answers
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
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 ...
0
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0answers
32 views

How to activate FP6293 converter from EN pin?

I'm making a portable device which is powered by a lithium battery and boosted with a FP6293 boost converter IC. I want to turn on and off the device from a switch that activates and deactivates the ...
0
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1answer
66 views

Combine two 8bit EEPROM to make 16bit EEPROM

I am working on building a computer out of logic chips. I want to use an EEPROM as the instruction memory. However, my EEPROM's only has 8bits data output, but I want my instructions to be 16bits long....
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3answers
90 views

Simplest way to count quadrature encoder counts [closed]

I need to count the pulses from a high-res quadrature encoder but the prohibitively high frequency means I can't use my main processor. I looked into the HCTL-2022 IC which does exactly what I need, ...
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2answers
67 views

What did I do wrong with this switching voltage regulator circuit (LM2574)?

I'm new to the electronics world. I've been trying to build a switching voltage regulator circuit using the LM2574N-5G (datasheet) IC. I'm trying to switch 9V (from a 9V battery) to around 5V. I've ...
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2answers
84 views

Can I use a deserializer without a matching serializer?

I am trying to connect an LVDS output to an 18-bit parallel input. Ser/des ICs like this all state on their datasheets (like on page 12 of the linked datasheet) that before they are able to function ...
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1answer
85 views

Can an Integrated Circuit ROM ever be secured [closed]

This presentation which includes embedding public asymmetric crypto assets in a micro-controller on chip ROM suggests that there are, but I am sceptical. Is it the case that there is nothing that can ...
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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 ...
2
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3answers
103 views

Unkown DIP IC (OP277PA)

I stumbled upon the most uncommon thing. An 8-PIN DIP IC with part number (OP277PA.) However, the datasheet is nowhere to be found and I've done my research. Is it possible that it is an OPA277P, or ...