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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52 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
72 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 ...
-3
votes
0answers
66 views

How can a CPU (Core) begin executing binary code stored on die using silicon gated transistors [on hold]

Hello my question is basically if you have a binary code stored on die using the same silicon gated transistors (integrated circuits) but NOT by way of typical ROM or MaskROM memory design ...
-3
votes
0answers
39 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
44 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
45 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 ...
-3
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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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votes
1answer
20 views

IC switching signals with different voltage levels [on hold]

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 ...
-3
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0answers
45 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
16 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
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1answer
53 views

Circuit Board AND/decade counter [on hold]

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
61 views

Need to Identify unknown components D53, CT7 and 22X

Please help me to find unknown components
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2answers
42 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 ...
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0answers
38 views

How to change the device name of a bluetooth chip CSR8635 that appears on device search? [closed]

I came across a comment on youtube explaining the way of changing the name of a chip but it is just explained in general. Does anybody know in detail what should be done to change the name? The ...
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votes
1answer
55 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
votes
1answer
912 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
8 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
27 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
40 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 ...
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2answers
38 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
70 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
16 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
84 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 ...
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2answers
59 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? ...
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0answers
14 views

How to create a gate circuit using ITC99 benchmark circuit?

I wanted to create a sparse matrix from a electronic gate circuit to test my BFS(Breadth First Search). I figure out that many researches are using ITC benchmark circuits( ...
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2answers
56 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 ...
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2answers
54 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 ...
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1answer
53 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
83 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
votes
1answer
665 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 ...
0
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0answers
35 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 ...
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0answers
30 views

8 bit magnitude comparator using IC 7485

When making an 8 bit magnitude comparator by cascading two 7485 ICs, why do we connect the A=B pin to "HIGH" while A>B and A to "LOW" ? A comparator will first compare the MSBs before the LSBs. ...
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4answers
106 views

How to design Current Amplifier circuit to amplify the signal current to 1A

I am trying to design a current amplifier circuit to amplify a signal current to 1A. Application : I am generating a signal using microcontroller (for ex : Pic16f877A). This signal is 5v having 10mA ...
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1answer
41 views

How can I build a monostable multivibrator (one shot) using 74LS123?

how can I build a monostable multivibrator using 74LS123? with 10 microseconds of pulse. please help
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2answers
72 views

Is it possible to connect a NOT gate (74hc04) to connect two separate circuits in parallel?

Say I am low on the number of IC, can I use the same not gate for two different connections in parallel in a breadboard? Will there be any interference like short circuits or unexpected behavior if I ...
1
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2answers
82 views

First Time Using Integrated Circuits

I am building a circuit for a custom application. I have an old Toyota truck, and I keep leaving the headlights on, because there is no warning buzzer! I have designed a circuit that takes 3 inputs: ...
0
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3answers
61 views

Circuit to test ICs at home? (74hc04, 74hc08, 74hc32)

I have the above IC and I want to check them before using them. I don't have access to a lab currently and I only have access to the usual stuff (LED, resistors) and a simple ammeter/voltmeter. What ...
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votes
1answer
43 views

design 8-bit adder with 74LS83 [closed]

How can I design a 8-bit adder with chip 74LS83?
0
votes
1answer
46 views

DIL IC for simple non-volatile memory [closed]

Can anyone suggest a DIL IC where I can store a couple bits of memory without having to use a complicated interface like serial, I2C, and etc. I want to be able to store at least 2 bits of memory to ...
0
votes
1answer
81 views

Why DC resistance is used in MOSFET?

With mosfets there are two resistances called DC resistance Vds/Ids and AC resistance dVds/dIds at the operating point. I am wondering about the purpose of giving the DC resistance here? Where the ...
0
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1answer
28 views

How is MOSFET modelled in DC analysis?

I am wondering how simulator (LTspice, Cadence,...) compute DC operating point of MOSFET in DC analysis. I know that in DC analysis, capacitors are open and inductors are short. With MOSFET how is it ...
-1
votes
2answers
110 views

How to program a microcontroller via USB using JTAG? [closed]

I have some hard time understanding JTAG for programming. I have an mcu that can only be programmed via JTAG. What are some easy chips to start with in order to program an mcu via JTAG? I suppose I ...
0
votes
1answer
48 views

Arduino/IC Picture Scanner [duplicate]

For a project I am working on, I need some kind of way for a micro-controller (preferably Arduino, since I have background knowledge) to identify a certain symbol on a piece of paper (e.g. recognising ...
-2
votes
3answers
52 views

How to bias the MOST current mirror? [closed]

I am looking for a simple tutorial or decent primer. Because all what I've found yet is so not helpful. Could you please help me? f.e. how to make 5u output current using a p-MOS current mirror...
0
votes
2answers
43 views

Bredboard compatible FAST TTL [duplicate]

I have been looking for 16-bit ICs for a project i`m working on. The project is to build a 16-bit computer from scratch, therefor i decided i nedded cgips that could handle high clock-frequensies. ...
-2
votes
2answers
52 views

Get scale of how many inputs are connected

I'm looking for specific IC, don't know what it would be called or even if something like this exists, but I'll try to describe what I need. It should have at least 4 inputs (the more the better) and ...
0
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1answer
58 views

Input resistance of differential LNA

This is a wideband differential LNA. I am trying to calculate the input resistance of this circuit but the result is not anything similar to the result shown in the picture below. Could you explain ...
-1
votes
1answer
71 views

multiple power supplies (5V, -12V, +12V) all on same board [closed]

I'm finishing up a pcb design and my specs just changed and I need to power an external sensor with +/-12V. I previously had only been concerned with the voltages >0 but now I have to supply voltages ...