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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Low Pass Filter With Hall Effect and ADC Help

Background: I am using the Allegro ACS758KCB-150U hall effect based current sensor, here is the datasheet, I am using it to measure current drawn by 24V motors, between about 20A - 130A. The reason ...
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2answers
108 views

AC Main measurment IC [on hold]

I need to detect low voltage AC power. Can you please suggest a method using micro controller to achieve this? I have made an attempt at this by converting it to DC, but there is a large fluctuation ...
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1answer
56 views

How to calculate electric current in this electric circuit?

Ok here is the problem. I have this circuit ( picture below ) and I need to design buck converter for it. I was told by my mentor that I should calculate electric current this circuit will consume. ...
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28 views

Datasheet for Panasonic MN6627971KB

I have been looking for a datasheet for this chip Has 4 printed rows of text as follows Panasonic MN6627971KB 515U5031 JAPAN 128 pin located in a car audio system. Could be a model specifically ...
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18 views

How to choose a single H-Bridge IC?

They all seem to pretty much offer the same features. On what basis am I supposed to compare single H-bridge IC's for a typical application of driving a smaller (<1A max) brushed DC motor, similar ...
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0answers
60 views

how many transistors can be fitted into an IC by 1971 and what could be achieved by that [closed]

facts show that around 2300 transistors can be fitted in an IC by 1971 and moore's law can be used to predict the number of transistors in an IC. but what was the possibilities uncovered with this ...
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27 views

How to design mobile charger using lm3622

I want to design mobile charger using LM3622 Lithium-Ion Battery Charger Controller. I read datasheet by TI( http://www.ti.com/lit/gpn/lm3622 ) , but much of its content I can't understood. So please ...
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322 views

Add delay in circuit

I am using a Light Dependent Resistor (LDR) and a laser to make an burglar alarm system. My laser continuously projects beam on LDR and when the beam is interrupted the LDR starts to ring the ...
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2answers
122 views

What's wrong with my switch mode power supply circuit?

I'm using a TPS54383 dual output SMPS IC from TI, putting out 12V and 5V; at least in design. I created a schematic and board and had it sent out to OSHPark and soldered it all up today and only the ...
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1answer
64 views

What's the difference between IC 74HC04 and IC 74AC04PC?

I am trying to make a simple logic gate simulation for which I require the former IC but I could only procure the latter. Will it still work?
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5answers
193 views

How to drive 30 LEDs with a smaller amount of pins?

We have 30 LEDs in a row, and we want to turn them on left to right. However there are way to many for the Arduino to have each one on a different pin. Is there an IC that can take a binary output, ...
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2answers
29 views

Multiplexing buttons using shift register - high impedance output

I have experience with 74HC4094, and I believe the 74HC595 is essentially the same - the datasheet says they have "tristate output", but that is only when OE is low - then all pins are tristate. What ...
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2answers
74 views

Why we need 100n cap parallel to IC power supply [duplicate]

I've seen this in many schematics, I also do it myself, but I don't really know why it's needed. I've also noticed that on RGB led strips, there's tiny 100nf caps, too. Why is it needed? Also, if ...
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3answers
728 views

Why does this EPROM have comb-like structures around the wire bonding pads?

I took some pictures of a Microchip EPROM die from the late 80s / early 90s (I can't recall the exact part number). The wire bonding pads are surrounded by a comb-like structure. What is the purpose ...
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2answers
32 views

Question about the current flow and voltages in a simple NAND diagram

I've so far learned about boolean algebra and its applications to transistors. This is a picture of a NAND diagram: A NAND has this boolean property : \$ f(A,B) = \overline{A \cap B}\$. What I want ...
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1answer
88 views

What is the difference between Vio and Vcc in an electronic circuit?

Can someone please explain the difference between Vio & Vcc and what do they stand for ? Edit: Modified my question based on the first comment.
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2answers
75 views

Replacing resistors with active load in active filter

I am building a low pass filter IC in 0.25 micron CMOS. My design requires 14 Mega-Ohm resistors. I want to replace them with an active load in order to save space. If possible I would like to use a ...
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1answer
46 views

Question about IC regulators [closed]

I have a basic question about IC regulators that I know someone here can answer. Basically if I had an IC 7812 regulator in a circuit that has an input voltage of 14 volts, would the output voltage be ...
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0answers
24 views

Discrete MOSFET driver control IC

I am building a Marx bank, which consists of multiple MOSFETs connected in parallel when charging and in series when discharging. I have each stage of the pulse generator designed, including isolated ...
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0answers
24 views

How to preserve MSL 3 devices

I have bunch of ICs that is rated MSL3 that came in a moisture barrier bag. For an urgent work, I needed to open the package to use one device. Could anyone tell me how I should preserve rest of the ...
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2answers
45 views

Choosing resistor values for a 555 timer

I have to design a frequency counter using a 555 timer as a pulse generator. I included a schematic for part of the circuit, but this is my first time using a 555, so I also included the original ...
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2answers
56 views

Reverse biased capacitor on IC input pin

I am looking at the test circuits on the data sheet for the AN6884 VU meter IC, and I cannot understand the connection to pin 8 in the following diagram: Pin 8 accepts a positive input voltage. The ...
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1answer
151 views

What is meant by output Leakage Current?

Is output Leakage Current= Output Current - Input Current? I encountered the term in a datasheet of the L9938 driver.
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1answer
107 views

3v3, 12v Smps: “Design ok!” “Pcb ok!” Why not stable? Please Help

Im working on a project and i need 3v3,5v and 12V in this. I though smps circuits would be better than Linear Regulators. So i choose LM2676-adj IC. I designed schemetics for 3V3-3A SMPS and 12V-3A ...
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1answer
54 views

Equivalent of IR2155

I build a circuit based on IR2155, but it's not so readily available in my area. Is there an equivalent IC for IR2155?
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1answer
62 views

Bypass IC output to give an LED a voltage boost

I'm attempting to modify a circuit in an existing device, the relevant part of which looks like this: The IC controls the LED brightness, as well as having connections to other things. I have ...
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1answer
70 views

Is there relation between logic chip names and their internal structure

I know that for instance an ATMega328 is a 8 bit MCU with 32k of program space, the same can be said for most other MCUs and some other ICs with a direct relation between the name and internal specs. ...
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1answer
53 views

Undefined part of CSR8645 chip

I am trying to build a bluetooth audio headset and decided to use CSR8645 chip, but while trying to understand diagram of this chip i couldn't identify one part of it. I am uploading picture ...
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1answer
113 views

Monolithic and Hybrid Integrated circuits

I was told by my professor that ICs can be of two types, monolithic and hybrid and then she went on to explain technologies of fabrication. What is the difference between a monolithic IC and a hybrid ...
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1answer
220 views

What are Vcc and GND on a shift register?

What are Vcc and GND on a shift register? I thought that I had to provide a positive voltage to the IC via the Vcc, but turns out that I can operate my shift register without powering the Vcc. ...
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1answer
608 views

What's this component?

What is this component?(U6) Source
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3answers
233 views

Simplifying CMOS schematic to reduce number of transistors

I know the basics in creating a schematic in CMOS, wherein in a(n inverted) boolean expression, if there is a: NOR - NMOS should be in parallel, PMOS in series; NAND - NMOS in series, PMOS in ...
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1answer
51 views

Can you use a SPST to turn on and off two power sources?

I have several batteries in series and the ground point is in the center, such that I can achieve a negative and positive voltage. The OP amp uses both negative and positive voltage. Let's assume I am ...
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4answers
128 views

How do current limiting resistors work between ICs?

In a simple battery+resistor circuit with a fixed voltage, the resistance of a series resistor determines the current flowing through it. But what happens if this resistor is placed between two ICs? ...
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2answers
240 views

Understanding the Texas Instruments CD4075 datasheet table

I downloaded the CD4075 IC datasheet and I'm having trouble understanding the lines labelled "Output High (Source) Current" in the table below. The table shows current values relative to temperature ...
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0answers
36 views

Receiver effciency when using DFLL instead of PLL

I have a small doubt! How tolerant are industrial standard receiver chip to phase and frequency error. I bring it out because while designing a transmitter, I want to use DFLL instead of PLL to reduce ...
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1answer
57 views

adjust clock frequency using Timing Error Avoidance Technique

I am following the next example as is depicted on the diagram, in order to adjust the clock frequency of a multiplier to its maximum. The System works as follows: The flip-flop at the input to the ...
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1answer
51 views

Connecting analog power domains in the same chip in ICs (Integrated Circuits)

I have a following issue, which I didn't see in IC books: I would like to know if it is possible to send analog signals (sin waves) between two power domains in an integrated circuit. The issue looks ...
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2answers
42 views

looking for a smart way to compare DCDC Converter IC [closed]

I'm looking for a quick and easy way to compare DCDC boost Converter IC, to all or most manufacturers. Does anyone know tools, sheets or charts? Thanks!
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1answer
57 views

falling delay inverters VLSI CMOS

How do I obtain the falling delay driving by signal A: Data: ...
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0answers
29 views

Help with harder version of carry chain adder?

I am designing an addr circuit given cin = 0, given a nand of the operands i want to add, their xor, and nor. I have drawn it in a software but i am not getting the right output, i have tried to ...
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2answers
118 views

Identifying two 6 pin SMD packages

I need some help identifying these 2 SMD parts. One says .3Ft and the other says .1Ft. They each have 6 pins. They are found ...
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1answer
87 views

can I charge Mobile battery using mobile charger directly?

I want to charge mobile battery of 3.7 v directly by connecting 2 terminals of charger(5 v output) to two terminals of battery. My questions are Is IT POSSIBLE? what must be voltage adjusted to ...
0
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1answer
39 views

How should this code look like in verilog?

I am designing an ALU to add at state 000, I have to assign control signals for a mux, carry in, and operands so that it works. so, i wrote an if statement in the controller module, and the TA told me ...
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0answers
57 views

What could this PLA be doing?

The picture below shows a PLA, I have done part (a) and found out that; F0 = A0 xor B0 F1 = A0B0 + (A0' + B0')(A1 xor B1) F2 = A0B0(A1 + B1) + A1B1 What may this circuit be doing, I can't see a ...
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1answer
63 views

Why are the charge and discharge rate of Lihium Polymer Batteries different?

I have a 3S 1.3MAH Lithium Polymer battery with a 25C discharge rate, and a 5C charge rate.From what i know, the discharge rate is the rate at which the battery can be safely ischarged( i.e how many ...
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2answers
118 views

what stops manufacturers from making hardware optimised game engines

Just like the mp3 and h264 have been made into a circuit, what is stopping graphics card manufacturers from building a game engine (the program that most often runs on a graphics card)into the ...
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2answers
65 views

IC for 4 Kbytes of RAM [closed]

Is there a Memory IC for 4Kbytes of RAM? I'm trying to make a schematic capture in Proteus and I need a Memory IC for 4Kbytes of RAM, I've searched throughout the library and I can't find one, tried ...
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0answers
40 views

Energy Monitor IC with built in Hall Sensor

I have looked at a couple of IC's which provide energy measurement(real power,apparent power), however these need to interfaced to a current transformer or a hall effect sensor since they cannot ...
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7answers
5k views

Why do microcontrollers have so little RAM?

Maybe this is more of a perceptional problem, but it seems like microcontrollers have advanced by leaps and bounds in the last 20 years, in almost all regards, higher clock speed, more peripherals, ...