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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14 views

How to interface si8902 with atmega128rfa1?

The atmega128rfa1 works as master and si8902 works as slave that is okay. But when a request is given Si8902 takes 8us to reply back with the ADC data. How can master wait for 8 us. How to synchronize ...
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1answer
37 views

ACS712 Low Current Sensor

Before I begin, just to let you know that I'm new to electrical engineering, in case that my question sound weird to you, but here's my problem. I bought few days ago ACS712 Low Current Sensor and ...
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0answers
29 views

7490 Generates invalid number

I am making a digital clock using 7490 IC. The problem is that the IC generates 3 odd numbers: number looking like 4 and 5 right before 4 and 5... another one looking like 6 right before 6. These odd ...
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3answers
58 views

Gain vs Output Impedence

I am currently trying to improve my understanding of analogue IC design and my textbook kind of brushes over this problem. It is made quite clear that a low output impedance is desired so that the ...
-7
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0answers
58 views

How would you power on an undocumented CPU (Core) [on hold]

Hello we are of need of some help possibly assembly instructions or program on how to go about powering on and make active a undocumented core or at least make attempt(s) via assembly language script ...
3
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2answers
207 views

US5881 Hall Effect sensor not detecting AC field

Yesterday I was disappointed to learn there is no magical IC to measure current flow in a standard appliance cord. On the advice I received, I went ahead with a US5881 Hall effect sensor and split ...
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2answers
44 views

The current use of simple logic gates [closed]

I have been learning about digital electronics and playing with some simple integrated circuits like the 7400 series. The 7400 chip, for example, has four NAND gates and I understand some of the uses ...
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1answer
21 views

An alternative for the MPR121 [on hold]

I've been working with the capacitive touch IC for 12 electrodes : MPR121 from freescale now belonging to NXP, the problem that I got is that the chip is not been produced anymore, I've been looking ...
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2answers
119 views

simple IC for on-off current detection?

I am trying to identify an IC that can sit in proximity to an appliance power cord (120VAC) and simply detect if current is flowing or not. On-off output is fine; no need to actually measure the ...
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0answers
16 views

Calibre LVS error

Hi i did my layout in cadence virtuoso and i had passed clean the DRC and LVS. Now when i run calibre DRC i am getting "metal density error". I was testing a layout design that was already fabricated ...
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0answers
35 views

What is this 5 terminal part marked AA17s?

I am doing some reverse engineering with a toy RC helicopter pcb, trying to make my own. At the original pcb there is a small 5 terminal part marked with "AA17s" on top, which I have no idea what it ...
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1answer
49 views

1V to 5V dc-dc step-up circuit @ Iout = 1A

I am trying to convert unregulated 1V input to 5V, 1A output within a project I am working on. I have tried working with MAX757 but could not get it to work. It takes a couple of weeks for maxim ICs ...
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1answer
24 views

PSpice Simulation of CE8301

I have been working on a project that requires me to boost 1V to 5V. I have found a ready-to-use boost regulator that gets the job done. The problem is that I need to get the circuit simulated on ...
3
votes
1answer
49 views

Understanding the complex circuitry in supplying voltage to an IC chip

I'm very new to microcontrollers and I'm trying to understand the purpose of the pinouts of an IC so that I can interface it to a microcontroller. Most of the pinout description from the datasheet are ...
1
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1answer
61 views

A simple memory chip

I think I understand how one can use an Arduino to program an external EEPROM memory chip. I am wondering if there are any memory chips that don't need any type of micro controller to operate. So, for ...
5
votes
2answers
978 views

Where is this LED getting its timing from? [duplicate]

So this little board when connected to 5v and GND start blinking different colors in different orders and with different timing for colors to stay on! There is nothing on the board other than the LED ...
2
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1answer
101 views

What are all the tiny features on this microchip?

I've been reading some very basic introductory material on computer hardware and it occurred to me that I would like to take a look at a microchip to see the physical implementation of a simple logic ...
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0answers
14 views

Optimum 1-bit full adder with least PDA product

Out of the following adders which one have the best (Power \$\times\$ Delay \$\times\$ Area) product : Mirror adder Complementary Pass Transistor Logic Dual-rail domino Transmission gate full adder ...
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1answer
25 views

Creating Cadence Virtuoso Layout in Rectangular MOS Power device [closed]

I am trying to create a Power MOSFET with W/L = 9.2mm/1.6u This value is as per the design specification obtained by simulation using schematic value. I am new to Cadence Virtuoso and would ...
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2answers
98 views

What is stc32ab IC

I have some stc32ab IC's but I cannot find any information or datasheet for them. Please give me some information and/or datasheet about this IC
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1answer
56 views

Why the pins of a port in some microcontrollers are not in order? [duplicate]

In some ICs the pin numbers are not in proper order. For example, in msp430x12x2 series (following pic). In the pic, why don't P2.0 be available at pin 20 (or adjacent to P1.0 ??) Why is that few ...
0
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1answer
73 views

Why do over-currents destroy IC's?

Power driver IC's (like the L298) have absolute maximum ratings for peak current, continuous current, and temperature. I get why overtemperature could cause the IC to fail, but, assuming I kept the ...
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0answers
68 views

Identify ic from 24v smps

Pls help me identify the ic used in a 24v smps. It has marking IFA=W03, 6 pin DIP, plastic package.
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1answer
48 views

SOIC‑14 package dimensions confusion

I looked at the dimensions drawing of the SOIC‑14 package from texas instruments. But I am a bit confused about the way texas instruments marked some lengths. Why there are two values seperated by a ...
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3answers
46 views

Strange IC input leakage current

I am reading the datasheet of the HEF4894BT. First I saw the input clamping current is rated at 10mA and than I saw the input leakage current would be 10mA, too. I thought the input clamping current ...
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0answers
25 views

Circuit board 7490 decade counter [duplicate]

I'm having problems trying to connect two 7490 decade counter to make a two digit display. How do I make this work?
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1answer
24 views

IC switching signals with different voltage levels [closed]

I am reading about ICs and wondering if there are some ICs (and how to differ those) that can do a task which I will describe below. I have several digital outputs from Arduino. Those signals are ...
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0answers
46 views

Circuit Boards 7490 [duplicate]

Can someone explain how this chip work? How can I make it count faster in terms of 10ms. Also what pin should I use as an output?
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0answers
20 views

A pulse triggered bistable switch circuit

I'm designing an IC but need a simple circuit to turn ON/OFF by a pulse and stay in its state until another pulse comes to switch it to the other state, I found several things like those on the ...
0
votes
1answer
57 views

Circuit Board AND/decade counter [closed]

What output do I use to connect the decade counter to the AND chip? I'm confused as to what pin to use to output to the AND chip? I've circled where I need to connect the AND chip and the decade ...
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1answer
64 views

Need to Identify unknown components D53, CT7 and 22X

Please help me to find unknown components
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2answers
49 views

Why MCP73871 lithium battery charger IC takes so long?

I'm working on a Microchip IC: MCP73871, a very small linear charger for lithium-based batteries. It has very nifty feature: a load-sharing system that gives priority to the load over the battery in ...
-3
votes
1answer
60 views

modifying a frequency counter to make it a frequency meter [closed]

Is it possible to modify this circuit and make it a frequency meter? This is an assignment and none of us know how to do that. We all have considered to make another circuit and not modify the one ...
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0answers
35 views

Circuit confusion help

Can someone help me understand this circuit. I'm confused how both 5v and 12v are connected to same transistor Q63. Is 5/12v flowing through the same circuit when it's turned on? Or is Q63 simply ...
12
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1answer
935 views

What is a “risk wafer”?

In integrated circuit manufacturing I came across the term "risk wafer" which seems to be different from a "normal" wafer. But I can't find any information online on what a risk wafer really is.
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0answers
9 views

Low output voltage on load sharing battery managment IC?

I have a battery management IC with load sharing (MCP73871) connected to a 5 V input. When I don't have a battery connected, I expect the IC to pass 5V through to the output. Instead what I'm getting ...
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0answers
28 views

Can I connect the current sink pins of a linear LED driver?

I am designing a little battery powered LED necklace/button kind of device, which has a matrix of 42 LEDs. Each column of the matrix is driven by one CAT4002A to achieve a defined current and to allow ...
0
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0answers
42 views

use of ISD4002 SPI with FPGA

I am trying to build a circuit that would be some kind of INTERCOM and will be controlled by FPGA (cyclon 2 by altera ) . Because I need to have multi voice channels I choose ISD4002 because in my ...
0
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2answers
40 views

Drive a capacitance load with a very large output resistance analog voltage source

I have a signal source with a very high output resistance. The output of this source is connected to the input of comparator. Actually the input capacitance of comparator is not large (about 20fF). ...
0
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2answers
72 views

Adding to a circuit the ability to “remember” the last chosen settings when turned off or disconnected

If you could please bear with me: I'm just starting out in electronics and I've had an idea for a nice experimental mod that will also be useful. I've recently bought a pretty cool little 8 x 8 LED ...
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0answers
22 views

What's the peak voltage of the sawtooth generated by the ic SG3525 or UC3525? Does it depend on the Ct capacitor?

P.S. I need this information in order to make a closed-loop FlyBack CC-CC converter. The Tm transfer function is related to the sawtooth peak voltage: Thanks!
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0answers
87 views

UN-IDENTIFIED ICs

Found a few chips that I need help with, Cant seem to find datasheets anywhere: M50467-095P - 24PIN - SAMSUNG SL62932 - 8 PIN - INTERNATIONAL SEMI M51551P - 14PIN - MITSUBISHI ...
1
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2answers
64 views

What does the open circle in the circuit depict?

The open circle at pin 4 in 555 and pin 13 in 4017 has got me confused. I'm new to electronics and any help will be appreciated. Also does the pin 5 in 555 need to be connected to pin 12 in 4017? ...
1
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2answers
60 views

MOSFET as a VCCS or an variable resistance

I am a bit confused. In saturation region, sometimes, an MOSFET is called voltage-controlled current source and sometimes it is called variable resistor where its resistance is controlled by the ...
0
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2answers
62 views

Distortion in TDA2030 circuit

I looked at a friend's guitar amplifier which wasn't working, the problem was clearly (because it fell off) a broken IC (TDA2030AC). After replacing it, the amplifier started working again but when I ...
0
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1answer
67 views

will there be any difference between the output of a 555 oneshot and one made with a 74123?

I think there won't be any difference because the professor wants us to build both with 10 us pulse and with a duty cycle of 25%. I didn't have enough time to build both MMV, so that's why I am ...
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0answers
32 views

Reason of high packing density in integrated injection logic family

I have read that in Integrated Circuit manufacturing , resistors are made of either diffusion or metal/poly deposit. In diffused resistors we use the bulk resistance of diffused regions. But why do ...
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2answers
84 views

I need some help with analysing this differential amp

I'm having some trouble with analysing a differential amp. The amp and its associated operating parameters are in this link (question 1) http://imgur.com/iS6fD5N What have I done so far? Well I've ...
3
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1answer
671 views

What is this chip and what is it for?

I found a strange 6-pin chip with a barcode and SA20 imprinted on the back of it, The front has a hex shape deeply engraved on it. I looked up the chip online and I couldn't find any information on ...
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0answers
36 views

Li-ion protection circuit: MOSFET connection

I've checked a lithium ion protection circuit and found out that the D1 and D2 terminals from AO8810 are connected: But checking AO8810's datasheet I find that the MOSFET's drains are internally ...