hai ,
how to take fanout for IC s
Fanout⌠thatâs circuit design from a long ago era, not Kicad related.
It would be best to search the internet for that.
My bed time; goodnight from me.
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What âfanoutâ is?
Google translates me âfanoutâ from English as âfanoutâ in Polish. But I have never heard such word.
I thought I know enough about electronic/PCB to not be surprised by anything but I see I was wrong.
Fanout is routing the tracks out from e.g. BGA pads.
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The âclassicalâ meaning of Fan-out is different:
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Oh! So Cadence is wrong and incompetent. Iâll tell them âŚ
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No one said Cadence is wrong or incompetent. The point is the poster, non native English speaker, may see this in a different but electronics related way and become even more confused.
Not incompetent, just lacking enough imagination to dream up a new terminology. Instead; using a term that was all the rage in the 1960s & 1970s with DTL & TTL gates. 
Anyway; both uses of the term fall under the category of Electronic design, not Kicad.
Youâre showing your youth 
and Iâm showing my age 
I donât think so.
We simply use different term for how many gate inputs one output can drive. Direct translation would be: âload capacityâ. I think Google translator simply donât know what little different terms are sometimes used for something.
RS485 driver âload capacityâ (may be it is fanout, but ??) is 32 RS485 inputs. But thanks to inputs being 1/2, 1/4, 1/8 of standard load one driver can drive 64,128 or 256 inputs.
This is probably not a KiCad question. Moving it here so for further elaboration, or more likely, just speculation. Setting auto-close to 3 days also.
Of course it is not a Kicad question. Iâve already made two comments to that effect.
Sometimes we regular users get a little carried away with the irrelevant. 
And Iâm not sure if the correct category is âLayoutâ 
Who know WTF the correct category is, probably Speculation.
Idle fingers?
Gossip?
Deep, informative discussion?
The generally accepted terms for routing BGAs are âescape routingâ or âbreakout routingâ. That a company invents its own language is their problem, not the industryâs.
Fanout is the technical term for electrical loading of outputs in logic circuits.
Yes, please tell Cadence (or at least their marketing dept. who apparently made a âQuantum Leapâ by reimagining the word. Looks good on a Powerpoint presentation, I guessâŚ)
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The idea of fanout goes back to the old days of bipolar transistor based TTL logic such as 7400 series. If a TTL gate output capability is 4 mA and the input is 0.4 mA, then the fanout = 4 mA / 0.4 mA = 10.
I doubt that this simple calculation makes sense with the (somewhat) newer logic families such as CMOS 74HC00 series. Those still have significant output current capability (some are 32 mA when powered by 5V) but the CMOS input current is probably in the pA range. There may be tradeoffs with edge speed and capacitive loading as the number of driven gate inputs increases.
You can probably take the IC out of the fan, but not the fan out of the IC. 
Arenât you a fan of ICâs?
Some ICâs need fans to keep them cool. And these days the fan might need an IC to keep them running.
âI see!!â
ThenâŚthere is the fan club. I have always figured that was a brutal alternative to simply unplugging the fan 
Trust Cadence to abuse a term that older engineers will know meant one very clear and different meaning back in the TTL logic days.
These days it includes track impedance and load capacitance, but still nothing to do with the geometry problem Cadence describe
Iâm a fan of both Discrete and Indiscrete Circuits.
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Should this thread be closed before **** **** *** fan?
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