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Aoedogg
Aoedogg • Jan 26, 2009

FPGA --> TTL Buffer

Hi Everyone,

I need to interface a 3.3v FPGA board with some 5v components - in both directions (i.e FPGA -> TTL and vice versa)

Currently i am looking at this device to do it: https://www.standardics.nxp.com/products/alvc/datasheet/74alvc164245.pdf

From my understanding it is bidirectional and will suit my needs..

is this correct, or would i need 2 separate devices?

Thanks for all your help!
$---Jay---$
$---Jay---$ • Jan 31, 2009
u can use transceiver buffers.....it'll convert the signal to FPGA level...
use this device SN74LVC8T245 😁
Aoedogg
Aoedogg • Jan 31, 2009
Cheers,

Can this work from the FPGA to TTL level?
$---Jay---$
$---Jay---$ • Jan 31, 2009
yes dude. we are using this chip for our boards.
Aoedogg
Aoedogg • Jan 31, 2009
cheers bro, thanks for the help....
Aoedogg
Aoedogg • Jan 31, 2009
Hi,

Just to clarify on one point, would i set the IO standard on the FPGA to LVCMOS for use with this buffer? , also, is the device 5v tolerant on its IOpins?


Thanks!
bakshay
bakshay • Feb 1, 2009
hi jay
i am working on VHDL you have some knowledge of it
$---Jay---$
$---Jay---$ • Feb 1, 2009
u pls confirm to the datasheet about setting the voltage....but dont worry about fpga pins, u assign all the outputs as LVCMOS 3.3v while assigning UCF to ur design......
$---Jay---$
$---Jay---$ • Feb 1, 2009
hai bakshay, yeah i do have knowledge...how can i help u...?
bakshay
bakshay • Mar 22, 2009
thnx for replying JAY
i was not able to reply u , as i was getting my doubts cleard ..
my program for ADC was not working and yet it is not working
rajani2509
rajani2509 • Aug 4, 2011
Hi,
I need to interface a 3.3v FPGA board with some 5v components - in both directions (i.e FPGA -> TTL and vice versa) can I use 74LV244?

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