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FPGA 5V

Posted: Tue Jun 27, 2017 11:06 pm
by KanedaFr
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 ;)

Re: FPGA 5V

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

Re: FPGA 5V

Posted: Wed Jun 28, 2017 10:28 am
by cero
There's threads about this on nesdev, they also need 5v parts.

Re: FPGA 5V

Posted: Wed Jun 28, 2017 10:33 pm
by KanedaFr
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 ┬ÁC and some king of FPGA...need to find it and get more details

Re: FPGA 5V

Posted: Fri Jul 07, 2017 12:27 am
by KanedaFr
I wonder if it won't be easier to be full 3.3V, which mean protect EVERY pin with level translator....

Re: FPGA 5V

Posted: Fri Jul 07, 2017 4:29 am
by HardWareMan
Exactly.

Re: FPGA 5V

Posted: Fri Jul 07, 2017 10:33 am
by KanedaFr
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 :(

Re: FPGA 5V

Posted: Fri Jul 07, 2017 4:29 pm
by Chilly Willy
Digikey sells level shifters with up to 22 channels.

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

Re: FPGA 5V

Posted: Fri Jul 07, 2017 7:49 pm
by KanedaFr
Great find !!!

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

Re: FPGA 5V

Posted: Fri Jul 07, 2017 11:11 pm
by Chilly Willy
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!