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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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29 views

Need help finding proper Led driver IC

i am an electrical engineering student and have been tasked in creating a quite interesting project. Basically , the whole PCB with the microcontroller and all other parts is already designed, however ...
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47 views

LED Project: IC that supports different flashing options [on hold]

I am an electronics newbie. I found a number of circuits that allow me to control 10 LEDs using the 4017 IC. The circuits basically allow me to cycle between the LEDs. Can anyone point me to an IC ...
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Difference between input current and supply current?

I am reading and trying to understand datasheet of ICs. I am reading this datasheet now : http://www.ti.com/lit/ds/symlink/sn74hc00.pdf In the table 6.5, there are two parameters namely Ii and Icc. ...
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20 views

GPON controller chip [on hold]

Does anyone know which companies manufacture GPON controller chip (for ONU modems)? Any part numbers would be greatly appreciated. I only found Broadcom, but Broadcom doesn't provide datasheets ...
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29 views

What is the difference between a BIOS chip and a PCH

From what I can gather, the BIOS chip is a loadable memory space that handles initial I/O, system checks and CAN configure certain things like power states and clock rates, before handing operation ...
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99 views

Why cant we increase chip area?

According to Moore's law, transistors are getting double every 24 months. But now, we have reached the transistor size limit which results in leakage current. Then why can't we increase chip area size,...
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98 views

Why do semiconductor companies not provide their datasheets publicly? [on hold]

Some semiconductor companies such as Broadcom and Microsemi do not publish the datasheets of some of their chips such as networking ones. It seems the companies do not provide the datasheets without ...
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30 views

Efficient and Inexpensive Way of DC/DC 5V to -19V Conversion [closed]

I was wondering if there are any good IC's available for doing this. I have been thinking up some ways to do it, however, I am sure there are most efficient methods. I am not too well versed with all ...
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23 views

Raspberry Pi + L293D to switch 12V solenoid valves

I am porting an Arduino project to Raspberry Pi. On the Arduino I switched two 12V solenoid Valves with the help of a L293D IC. It worked perfectly. Now I am porting this system to a Raspberry Pi. ...
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2answers
61 views

What kind of IC drives this safety LED night light?

This night light LEDs circuit has three 4 positions: off fast blinking slow blinking LEDs always on The big central component is a switch. I was wondering what IC drives the LEDs ? From what I can ...
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31 views

Choosing the right IC for modeling data over a GSM network [closed]

I want to send digital information over the GSM network (over the voice channel). For this purpose, I need a modem that can handle: Ultra narrow band (400HZ - 3400HZ). noise (There is a lot of noise ...
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1answer
175 views

Logic Circuit Completely Failing (Cue Lights System)

I have been working on a circuit the details of which are below. Today I finally got round to finishing and testing it. Guess what! It failed... I don't know if this is the place for this but would ...
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19 views

High Voltage Supply with LT1308A

I am trying to build a circuit that outputs ~180V for a nixie watch using the LT1308A. I'm modifying the following circuit found in the datasheet on page 17: Now my circuit is essentially the same, ...
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4answers
146 views

Decoupling Capacitor Usage Conditions

I understand that decoupling capacitors are small capacitors (often 100nF) used on VCC/VDD on ICs. When are they most required and when is it just silly using them on every IC. Are they better used ...
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66 views

What is this IC “MC1MX31LDVMN5D”?

Would you please help me to know this IC.
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2answers
92 views

Designing a RAM, using 4x2 chips, with a 8 address capacity

This is a typical exam question, and I've seen some very helpful posts about, but I still have a lot of doubts. Given an integrated circuit of certain dimensions, for this example a 4x2, I have to ...
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3answers
61 views

Looking for Serial-controlled PWM generator [closed]

I'm looking for a chip to generate some PWM signals. Here are my requirements: Controllable via serial interface (SPI, I2C, or similar) Outputs 10-20 kHz PWM signals (even better if adjustable) ...
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2answers
67 views

Long (500ms) Pulse Extender

I have an SPST momentary tactile switch and want the pulse, whatever length, to be extended to 500ms (unless of course the button is pressed for longer than 500ms but we can ignore that if we hold the ...
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1answer
73 views

555 Timer Giving Unexpected Output (Astable Multivibrator)

I am using this design with the only exception that C2 is 150nF to change timing slightly. When I plug in the circuit and attach an LED across GND and pin 3 output the LED is static on. However, on ...
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4answers
81 views

Attaching wires to a SMT footprint

I have a pre-made motor controller which I want to re-purpose for a hobby project by pulling the MCU off and attaching to a custom control circuit (with a more powerful MCU, current sensors, etc). The ...
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0answers
35 views

Acceleration of sequential computation over time

I am looking for a model (or "law", as in Moore's law) to describe the acceleration of sequential computation over time. By sequential computation I mean, for example, repeated applications of a hash ...
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2answers
44 views

IC layouts - Transistors (Body)

I'm trying to get into IC layouts... Why do I see some IC layouts with or without the body terminal on the transistors. Do MOSFet transistors need a body terminal in an integrated circuit? Or should ...
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2answers
564 views

Water level indicator using ULN2803

i made an water level indicator using IC: ULN2803 Refer: Easiest water level indicator It works well when used on glass of water, but when connect to my rooftop tank all the leds slowly diminishes ...
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1answer
81 views

Actual Accuracy of an ADC

I checked quite some ADC datasheets and am a bit confused regarding the actual achievable accuracy of an ADC. Let's take this ADC for this example (ADC MCP3422): http://ww1.microchip.com/downloads/en/...
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77 views

Figure of merit of Operational amplifier

How can I measure FOM(figure of merit) of an operational amplifier? There are so many parameters, how can I decide which formula to use while calculating FOM?
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1answer
112 views

A book of all ICs?

I was just wondering if there was like a "the holy book" of ICs that contains almost every IC chip with their feature spec included (like the first page of every spec sheets)? Kinda like a dictionary ...
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What is 1315 HUL 5CX3 99063 that written on IC means in automated blood pressure monitor?

I am currently working on automated blood pressure monitor project and using Omron HEM-7111 as a standard for comparison with my built instruments. But there is an IC in HEM-7111 board that until now ...
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42 views

Where to get datasheets for this part: ZJL JL2233 1650M18 ?

I am currently reverse engineering an LED Driver (STARES LED DRIVER; Model No.: WLJ-60-50) for my LED Lamp where the lamp doesn't turn on anymore. The trouble I have with this PCB is that i can't ...
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0answers
39 views

Drone camera chip identification help

I tried searching for this chip and looking for a similar manufacturer logo but with no succes. I'm trying to get a datasheet on it. It is from a drone that records 720p 30fps video.
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24 views

Switching between multiple lanes to measure resistance

So I have a fair bit of MXM GPUs that have some sort of board problem or another, and measuring each pin vs ground is usually the second step to attempt repair. Oddly, I have an idea to measure ...
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0answers
44 views

How is CAM implemented?

I have a book statement: A content addressable memory is a circuit that combines comparison and storage in a single device. I want to know how this is implemented in real world? Sounds like an ...
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2answers
85 views

What is the difference between these two ICs?

Is there a difference between these two ICs, or are they the same? https://assets.nexperia.com/documents/data-sheet/74HC4049.pdf http://www.ti.com/lit/ds/symlink/cd74hc4049.pdf
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1answer
34 views

Overdrive Voltage Effect on Cascode Operation

Working on this exercise: I understand that if all the transistors in a cascode have the same current and the same Vgs then they will have the same Vov. However in this case the Vgs do not seem to be ...
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2answers
24 views

How to find the schematic diagram of a component in Multisim?

Could someone please tell me how to find the schematic diagram of a given conponent in Multisim, I've been trying to understand how does the IC 74LS729 (SR latch) work but coudn't succeed mostly ...
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4answers
1k views

MOSFET W/L ratio limits: what's (un)reasonable?

The answer to this question is probably process-dependent, but what are the limits of the W/L (gate width/gate length) ratio for MOSFETs? I don't know what is in the realm of the insane. I saw a ...
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1answer
60 views

What to do with unused pins for this ADC?

For my senior design project I'm using this ADC (HMCAD1511) https://www.analog.com/media/en/technical-documentation/data-sheets/hmcad1511.pdf I'm only using one of its four analog inputs - what ...
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4answers
340 views

Is an ethernet switch considered as an ASIC?

I work as an electronic reliability engineer. In order to estimate the reliability of integrated circuits, I need to know their type. Thus my question. Is this ethernet switch Marvell Link Street-...
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Did my multimeter corrupt the ROM/EEPROM in my TV remote?

So I got my first multimeter today... I understand the basics needed, but maybe I was a bit overzealous... My TV remote has 6 pins sticking out next to where the batteries go. I assume these are for ...
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1answer
35 views

Commercial SRAM with separate power supply for the core and peripheral?

Are there commercial SRAMs available with a separate power supply for the core transistors (6T) and a separate supply for the remaining circuitry such as the sense amps, write drivers, etc? I believe ...
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1answer
45 views

Proteus - IC UM66 - Library [closed]

I can't find IC UM66 Must I add a Library? If so, which Library?
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2answers
53 views

Is there a demux IC that allows a default signal (not just digital 0) to go to the non enabled outputs?

I am trying to control multiple servos using a Demux and I want the selected output to have one pwm signal and then all of the non selected outputs to receive the same default pwm signal instead of a ...
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1answer
55 views

How can i make f(a,b,c) = \$A \cdot B \cdot \overline C + A \cdot \overline B\cdot C\$ using only XORs and NANDs?

i have this problem where i need to make the Logical Function represented by : f(A,B,C)= \$A \cdot B \cdot \overline C + A \cdot \overline B\cdot C\ \$ using only XORs and NANDs The function was as ...
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2answers
51 views

How to invert the output of 74138 IC?

I have this incomplete circuit. I want to know if there is any other way ,except inverting each decoder's output or making changes in any other IC, to make the desired output be H and the others L?
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0answers
74 views

Can anyone please identify this 6 pin SMD integrated circuit?

Can anyone please identify this 6 pin SMD integrated circuit or what it does? I could not find it by the code written on it. It is from a solar charger and I need to replace it.
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1answer
131 views

IC product lifetime as function of junction temperature

If an IC is rated for an absolute maximum junction temperature of say 170 Celsius, obviously it is not recommended to operate there - but how drastically is product lifetime impacted if we are close, ...
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1answer
60 views

Difference between driver and transistor

I asked a question earlier question, "Is it safe to run Logic ICs at their maximum output current?" asking if it was safe to run logic ICs at their maximum current. From what I understand, this is ...
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4answers
73 views

Is it safe to run Logic ICs at their maximum output current?

I am building a circuit that will ultimately output to 8 7-segment displays. I am going to be multiplexing these displays. The displays I chose are https://uk.farnell.com/kingbright/cc56-12surkwa/...
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5answers
68 views

RS485 IC Termination Resistor Configuration

I've made a mistake on a design, that went into production... It was built like the drawing on the left, with R702 to 5V and R703 to GND, it should have been backwards... like the drawing on the ...
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1answer
45 views

What is Soldering temperature of STM32F303 IC chip 100-pin?

I want to solder a 100-pin STM32F303 IC on a PCB. What is the recommended soldering temperature? I could not find it in the datasheet.
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1answer
34 views

IC Identification - TT617-18-1

Does anyone have any ideas what this chip is please? Tried searching but to no avail. (I think the chip Identifier is the TT617-18-1). Thanks in advance.