15
votes
Accepted
What shapes can IC dies be?
The main restriction is that the easiest and cheapest way to cut a wafer is in straight lines that go all the way across the wafer. It's hard to start and stop cutting in the middle of the wafer, ...
- 30.3k
8
votes
What shapes can IC dies be?
Occasionally you see some unusual shapes, especially when the target structure is circular:
https://www.photonics.com/Buyers_Guide/ProdSpec/Sensors_Detectors/Photodiode_-_AXUV20A/psp7337
Aside from ...
- 16k
7
votes
What shapes can IC dies be?
While the questions asks What other tesselations can they be cut into?, a counter argument is what are the reasons why rectangular shapes are used.
From searching found other answers which gives the ...
- 1,504
6
votes
UC3845 Soft start circuitry
Most of the industrial designs I have seen with a soft-start implemented around the UC384x were made the following way:
At power up, the capacitor is discharged and pulls the CMP pin low, minimizing ...
- 21k
6
votes
What is this IC on the PCB? Top marking H09
Could be an AD8014 high performance current-feedback amplifier.
- 384k
5
votes
Accepted
Are there mux/demux chips that will enable N-signals to be connected in arbitrary configurations?
The component type you're looking for is a crosspoint switch IC.
They connect a number of A-side pins to a number of B-side pins in a programmable arrangement.
Analogue and digital versions exist, you ...
- 22.2k
5
votes
Accepted
What do these 2 NOR gates do in this wind turbine charge controller?
S-R Latch
The two NOR gates form an S-R ("Set"-"Reset") latch.
(Symbol from linked source.)
The two outputs 3 (Q) & 4 (not Q) are intended to be complements of each other.
...
- 6,036
4
votes
What is this IC on the PCB? Top marking H09
Possibly Ricoh RP111N091B.
SOT-23-5 Linear voltage regulator IC
LDO, 0.9V±0.8%, 500mA, +CE
- 13.7k
4
votes
UC3845 Soft start circuitry
Nevertheless, can a diode do the work?
In order to implement the soft start, comp needs to be forced low and allowed to rise gently. The output of the error amplifier can push/pull by as much as 0....
- 2,070
3
votes
Accepted
UC3845 Soft start circuitry
A transistor is better than a diode for longer soft-start duration.
Consider the values in @Verbal Kint's answer:
I(CMP) (sourcing) is 0.5mA min, 0.8 typical, with no maximum given (presumably ...
- 27.3k
3
votes
Identifying this chip in model railroad DCC decoder
diode "EN" (SOD323): PMEG3010CEJ - Nexperia
Taobao picture:
"MFIAV" (TSOP6): Si3993DV - Vishay
LCSC picture:
"S8" (SFLAT): CRS08 - Toshiba
LCSC picture:
"9CDG?&...
- 433
2
votes
What are the examples of a high noise enviorment?
"God is in the details." It depends on the nature of the "noise", and how it's coupled. A poorly-designed layout in an otherwise quiet environment may be very noisy. Strategically ...
- 2,555
2
votes
Multiple Direct Digital Synthesizers (DDS) to Increase Sample Rate
Old thread, but the AD9166 can do what you want. It has a high speed DAC going up to 12 GS/s and the NCO can be digitally modulated with I/Q at several GS/s. So the data stream is not that much faster,...
- 21
2
votes
What do these 2 NOR gates do in this wind turbine charge controller?
That is a basic SR flip-flop circuit with active high set and reset inputs.
The two inputs can set the state of the output with a high pulse, and it will remember the state until there is a pulse to ...
- 137k
2
votes
How to find the tolerance on the output of an op amp circuit?
I always start by including the error terms in the schematic. I believe that it looks like this. Then people can follow your equations easier.
Unless you are using an exotic opamp, or your closed loop ...
- 15k
2
votes
Accepted
What is meant by active and passive in the context of transistors in ICs (Gray/Hurst)?
A MOS transistor (a PMOS, generally) can be used as an on-chip weak pull-up (This is quite a common approach that can be seen in today's MCUs). So the transistor here is used as a passive device.
An ...
- 30.2k
2
votes
How to handle varying chip voltages on an I2C line?
If the chips don't share a common single bus voltage they are all compatible with, you can have a single bus with multiple segments, each running on different voltage.
Voltage level translation ICs ...
- 137k
1
vote
Pull up or pull down resistor for potentially unused inverter input?
From the data sheet, the magnitude of the input high current is much less than the input low current. So pull-up resistors are my choice.
LSTTL has an input capacitance of about 5pF. So to realize ...
- 13.6k
1
vote
Pull up or pull down resistor for potentially unused inverter input?
Generally, for LS TTL, a pull up makes slightly more sense. Usually that is because before LS TTL ICs, there were other TTL ICs and those consumed much less current with a signal that mostly idles ...
- 137k
1
vote
How to handle varying chip voltages on an I2C line?
The attached picture has the setup. Do I need to level shift the I2C
data and clock somehow?
Yes, you need to level shift. Make sure the 1.8 device can't be run at 3.3V or is 3.3V tolerant. Look for ...
- 78k
1
vote
What is this IC on the PCB? Top marking H09
Can also be some LDO from Torex Semiconductor
https://smd.yooneed.one/code4830.html
- 364
1
vote
What do these 2 NOR gates do in this wind turbine charge controller?
This pair of gates is a R-S flip-flop.
In this circuit this allows start and stop levels to easily be set independently
The designer for some reason chose not use analogue feedback to give this ...
- 32.6k
1
vote
1
vote
How to find/figure out the minimum supply current for a device?
Your mosfet driver lists quiescent current to be 6.2 mA. That is how much current it needs while doing nothing.
That will then sum with the gate drive current, which depends on what kind of transistor ...
- 680
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