FPGA 5V

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KanedaFr
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FPGA 5V

Post by KanedaFr » Tue Jun 27, 2017 11:06 pm

Does anyone know any FPGA or CPLD still 5V tolerant ?
It seems they're no longer available :(

And I'd like to avoid all the 3.3V level converting things...my goal is to increase my MCD life, not to make it commit suicide ;)

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TmEE co.(TM)
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Re: FPGA 5V

Post by TmEE co.(TM) » Wed Jun 28, 2017 12:35 am

Altera FPGAs : Flex, ACEX, APEX series (3.3V or smaller core but 5V capable IO). All are long obsolete, probably impossible to find and most probably not supported in free licenses.
Altera CPLDs : MAX7000, 7000S (5V) and MAX3000 (3.3V but 5V capable IO). They are no longer manufactured.

You'll have much less headache for both your mind and wallet by doing 3.3V and 5V translation, there are lot of parts for doing it.
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Re: FPGA 5V

Post by cero » Wed Jun 28, 2017 10:28 am

There's threads about this on nesdev, they also need 5v parts.

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KanedaFr
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Re: FPGA 5V

Post by KanedaFr » Wed Jun 28, 2017 10:33 pm

It became very difficult if I have

MD_5V <=>level shifter <=>FPGA 3.3V<=>level shifter <=>DEVICE_5V ;(

I read something about a Cypress PSoC 5V which include a µC and some king of FPGA...need to find it and get more details

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Re: FPGA 5V

Post by KanedaFr » Fri Jul 07, 2017 12:27 am

I wonder if it won't be easier to be full 3.3V, which mean protect EVERY pin with level translator....

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Re: FPGA 5V

Post by HardWareMan » Fri Jul 07, 2017 4:29 am

Exactly.

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KanedaFr
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Re: FPGA 5V

Post by KanedaFr » Fri Jul 07, 2017 10:33 am

I'll mean a lot of them : data bus + adress bus + control bus .... And a regulator to get a 3.3V line....

it's there any level translator network ? ;)
I only found 8 bit max...i'll need 4 or 5 of them :(

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Re: FPGA 5V

Post by Chilly Willy » Fri Jul 07, 2017 4:29 pm

Digikey sells level shifters with up to 22 channels.

https://www.digikey.com/products/en/int ... ageSize=25

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Re: FPGA 5V

Post by KanedaFr » Fri Jul 07, 2017 7:49 pm

Great find !!!

So 2x (GTL2000 and 22 pullup resistors of 350ohm and 1 of 200Kohm for ref) + 5/3.3V regulator

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Re: FPGA 5V

Post by Chilly Willy » Fri Jul 07, 2017 11:11 pm

That would give you 44 bidirectional translated lines handled by two chips. I'd probably go with SIP resistor networks for the pullups. Digikey carries those, too!

https://www.digikey.com/products/en/res ... ageSize=25

Those are bussed 6 pin resistor networks, so five per package. 9 would cover 45 pins... one more than you need, but close!

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