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.

learn more… | top users | synonyms (2)

0
votes
0answers
21 views

IOS App to design or see the documentation of 74 Family or others IC [on hold]

I'm looking for any app for IOS where I can see the datasheet or pins of IC like 74 family so I can design fastest when I'm not near a computer, thanks a lot
1
vote
1answer
55 views

Sequential circuit with more than 10 LEDs

I need to build a sequential LED circuit that will have more than 10 LEDs in a sequence. The LEDs should blink only one at a time. I know I can do 10 LEDs with a 4017 decade counter easily, but I dont ...
0
votes
1answer
42 views

Op Amp high voltage output

Is it possible to output voltages in the range of kilovolts and current of atleast >1mA using an input of <10V on a consumer electronics op amp such as IC 741? If not, then why?
0
votes
2answers
97 views

Voltage regulating

My first post here, please keep in mind that I hardly know anything about electrical engineering so please keep any replies in layman terms, thank you! I bought this 30cm white LED strip. It's set ...
0
votes
1answer
241 views

Is there a wifi chip on this board? [closed]

I have a Sony QX10 camera, with comes with built-in wifi. I want to to connect wired ethernet to it. I was hoping I could find a wifi chip inside the camera, and solder to where the ethernet traces go ...
0
votes
1answer
62 views

What is the significance of 8 bits in the context of an ADC0808?

ADC0808 is an 8 bit analog to digital converter. What is the significance of 8 bit? What does it represent? Which capability of IC does it represent?
0
votes
0answers
38 views

Node voltage analysis of PMOS charge pump

Why is it that the voltages at nodes A and B are 3.7 V and 7.4 V respectively at a certain phase, i.e phase 1? And just the ...
1
vote
0answers
46 views

at89c51 power supply [duplicate]

I am making a project using at89c51. I used my mobile charger (output: 5V, 1A) as the power supply. Will my IC get damaged due to the high current? I asked cause, without loading the program I ...
0
votes
3answers
72 views

Is there any way to interface 4x4 matrix keypad using 2 IO lines

I have two IO lines and wants to interface 4x4 matrix keypad. Using MUX ICs I need 4 IO lines. Is there any method to achieve it using 2 IOs?
0
votes
0answers
56 views

Info on the most used calculator ICs on the planet [closed]

Pick any standard (non-scientific, 7-segment) pocket calculator today, and you'll find the functioning to be very, very similar. Here's a generic one: They all have the four basic functions (Add, ...
0
votes
2answers
41 views

Digital selector switch SP4T

I'm building a multimode analogue filter for a synth project I am working on. I've been following some schematics I found in the wild. The project is working nicely on the breadboard so far but I ...
0
votes
0answers
41 views

2 Transistor 2:1 MUX with negative waveform

My PTL(Pass transistor logic) 2:1 mux show -ve waveform at at some inputs combination ckt and waveform show below: simulations perform at 180nm tech, 250mhz,1.8v power supply. How to cope this ...
0
votes
2answers
30 views

Low power ripple pulse counter

I'm trying to find a ripple/pulse/edge counter chip that can record rising edges from a wind anemometer while my AVR sleeps. The signal is typically 0-50 Hz. I want to read it every 10 minutes, so it ...
5
votes
1answer
45 views

Positive Photo Resist for lift-off & Negative for EBL?

I would like to know two things about Photo Resists (PR): How is positive photo resist used for lift-off? What is EBL and why negative photo resist is used in this case?
2
votes
1answer
55 views

What is the name the IC package which is SMD version of DIP in the same dimensions?

There is an optocoupler which comes in DIP package. But it also has an SMD version of the DIP package. This SMD package is not SOIC, because its pin pitch size is 100mil instead of 50mil. What is the ...
11
votes
4answers
796 views

Reason of multiple GND and VCC on an IC

What is the reason that most of ICs (e.g. MCU) has multiple (A/D)GND and (A)VCC pins? If it is to increase performance of an IC, how does it help to performance? or is it easier for the IC designer ...
7
votes
5answers
888 views

How to start reverse engineering a circuit?

I have an old controller card from a pc which had to control some stepper engines. But there are several problems with it: The pc isn't working anymore, and I have no access to the program which ...
0
votes
2answers
48 views

What is the function of switches in optical panel encoders?

I want to use optical encoder in my design. In the datasheet of the optical encoder, pin2 and pin3 are used as switches. Could you please explain how these switches work and how to use them? Thanks.
0
votes
2answers
79 views

Can someone explain what each pin does on an LM3914 dot/bar graph chip?

I got an LM3914 chip to control a ten segment bar graph, but I am confused on how to wire it. The data sheet is not helping me with what pins do what and how to wire it. I need to know how it works ...
0
votes
1answer
22 views

Can someone explain what each pin does on an LM3914 dot/bar graph chip?

I got an LM3914 chip to control a ten segment bar graph, but I am confused on how to wire it. The date sheet is not helping me with what pins do what and how to wire it. I need to know how it works ...
2
votes
1answer
60 views

How is “plug-in auto detection” realized with this circuit?

This question is specific for ACT2802X series 5V/2.5A Backup Battery Pack Manager IC. On page 15, there is a schematic that provides a solution for auto plug-in detection. However, I cannot ...
7
votes
2answers
1k views

What is the best way to convert 1.8 V to 5 V?

I connected HC-SR04 ultrasonic sensor, to single-board computer BeagleBoard-xM. Trigger pin requires 5 V DC. However, control pins of BeagleBoard-xM can provide only 1.8 V DC. What is the best way to ...
0
votes
2answers
55 views

PMOS, NMOS length width concept for low power circuit

Why for low power consumption width of NMOS taken same as length of feature and Width of PMOS taken as 2.5 times width of NMOS ? e.g for feature size 180n width of NMOS 180n and width of PMOS 450n. Is ...
5
votes
2answers
316 views

How do IC's know when there is a downward or upward transition of a clock pulse?

Title pretty much says it all. But how do most IC's, micro-controllers, etc. know when a clock cycle starts a downward or upward transition from the clock source?
1
vote
1answer
89 views

2 Transistor XOR Cell Floating Output Problem

I designed the following 2T XOR cell for my full adder purpose: Theoretically it gives correct output for all input combinations. But on Tanner Eda using 180nm technology 5V supply, it gives logic ...
0
votes
0answers
84 views

6 Transistor Full Adder

I am working on a 6 Transistor Full Adder whose circuit diagram is The circuit works fine but there is a problem: it needs a 25k resistor at XNOR and SUM point to show the complete Full Adder ...
1
vote
1answer
88 views

8 Transistor Full Adder

I am working on 8 Transistor full adder which is based on 3 Transistor XOR cell. I have studied many IEEE Papers for 8 Transistor Full adder. All have same ckt as above.But the full adder is not ...
0
votes
3answers
85 views

Op Amp reason for virtual ground [duplicate]

I'm very new to this topic Operational Amplifiers. Just started studying for my 4th semester. Can someone please explain to me why there is a virtual ground at the node after Rin. What is the reason ...
0
votes
0answers
58 views

DC shunt current measuring

I am trying to build DC shunt based high current measuring using bus bar. Each bus bar has a 1000V 20A rating. Is any IC available to measure? I have done with hall sensor based. So my plan to build ...
5
votes
1answer
177 views

How is EMI avoided inside of an IC?

I was re-watching this video about how CPUs are made and at the time of the video the link points to, I thought "Isn't there some EMI problems with all those transistor signals flying all over the ...
7
votes
4answers
191 views

Which of these marks signifies Pin 1 on the STM32F (LQFP64)?

I'm using the STM32F105, in a LQFP64 package. It has two circular markings, on opposing corners of the IC. This picture is for a different ST ARM, but the markings and silkscreen are similar: The ...
2
votes
0answers
71 views

Why are chips limited in their dimensions? [duplicate]

I am reading a book about digital logic and chip design. The book mentions that around 2012, the largest chip size that could be reliably manufactured is at about 858 mm². However, the book doesn't ...
1
vote
1answer
32 views

Planar process vs. 3D chip

As far as I know, the planar process of making IC, especially CMOS IC, is already a 3D process because a layer is added on top of an existing layer to realize various things (cf. Wikipedia IC Layout). ...
1
vote
1answer
44 views

making Tphl and Tplh equal

Let's say we have the following netlist ...
2
votes
3answers
99 views

Looking for 4 bit memory option

I'm building a small and simple 4-bit CPU and I'm looking for an IC to store the program opcodes. I've considered using eeproms although they seem too large for my purpose, being in the kilobyte ...
0
votes
0answers
46 views

What are my options for dual 4-input OR gates using the 74LS00 series ICs?

I have designed an ALU (Arithmetic Logic Unit) using Logisim and it's working quite well. In my design, I use a few 4-input OR gates. After reviewing this list of 7400 series ICs, I've come to the ...
0
votes
0answers
25 views

Issues With 74HC299 Register - Not outputting data after loading it

I am using a 74HC299 as an 8-Bit register in a project of mine. I am not using any serial circuits, it is just parallel input and output. I have it set up so that the master reset is hardwired to ...
4
votes
2answers
238 views

Cascading several SPI devices

Is it possible to cascade several different ICs on the same data line, in order to use less CS pins, by tying the digital output of each to the digital input of the next? I am familiar with this ...
3
votes
1answer
289 views

Weakest link in lifetime of electronic circuits

I'm working on a product, a single-board computer with an expected lifetime of 10-15 years, and I'm trying to identify the correct components to focus on for this. So far electrolytic capacitors ...
0
votes
3answers
145 views

What exactly is a microcontroller?

Can an optical mouse sensor chip (System On Chip) which has a digital signal processor, Serial I/O, and a set of registers be considered as a Micro-controller?
1
vote
2answers
91 views

Fan in Fan out problem

Fan out is the maximum number of inputs that can be connected to a specific output. Why can’t we connect more number of inputs to this output?
7
votes
4answers
1k views

Why do some people use resistors to create a HIGH connection on a chip?

This is a follow-up question to my previous one, What does Low/High mean on the connections of a chip?. To create a HIGH connection, you often just connect the pin to VDD, which is often above VIH ...
1
vote
1answer
107 views

What is difference? The name of IC's are punched or printed or stickered on top of it

I've seen in some IC's the name of it is 'printed' on the top side. But in some IC's the names are 'punched',they have impressions on the IC. And in some cases, a 'Sticker or a Label' has been ...
2
votes
2answers
183 views

Dimensions of TQFN-EP 48 lead package

I'm looking for the correct pcb footprint for the MAX1979 IC by Maxim, supposedly in a TQFN-EP package. While the land patterns are available on Maxim's website, there are apparently several 48 lead ...
-1
votes
1answer
74 views

melting ic epoxy casing

I was attempting to remove solder with faulty solder braid (there was no flux in the section I was using (for some reason...)), and I kept the soldering Iron on it for far longer healthy. Now the ...
0
votes
1answer
50 views

Modifying a chip on a bought voltage measurer

I have bought a battery checker for my RC LiPo battery packs. The battery checker can measure and alarm at low voltages between 2.7 and 3.8 volts, however with LiPo batteries, the interesting range is ...
0
votes
1answer
106 views

AN7149N -based power amp usage

I have assembled AN7149N-based power amplifier according to the datasheet, but it shows no signs of life. The only changes I made were 2,7 ohm resistor instead on 2,2 ohm one, and 1000uF capacitor ...
25
votes
11answers
5k views

Why do we need so many transistors?

Transistors serve multiple purposes in an electrical circuit, i.e switches, to amplify electronic signals, allowing you to control current etc... However, I recently read about Moore's law, among ...
1
vote
4answers
312 views

Duplicate pins on an IC

I've realised that several ICs with simple components, such as the FDS6690, provide duplicate pins in order to comply with a standard IC package (e.g. SOT23). My question is - are these pins connected ...
0
votes
2answers
136 views

Possible to use 7447 to drive common-cathode 7 segment display?

I know that the 74(LS)47 is designed to drive common-anode displays. However, is it possible to make it drive a common-cathode display? What is the simplest (in terms of components) way of doing this? ...