Aoedogg
Aoedogg
Branch Unspecified
26 Jan 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!
$---Jay---$

$---Jay---$

Branch Unspecified
31 Jan 2009
u can use transceiver buffers.....it'll convert the signal to FPGA level...
use this device SN74LVC8T245 😁
Aoedogg

Aoedogg

Branch Unspecified
31 Jan 2009
Cheers,

Can this work from the FPGA to TTL level?
$---Jay---$

$---Jay---$

Branch Unspecified
31 Jan 2009
yes dude. we are using this chip for our boards.
Aoedogg

Aoedogg

Branch Unspecified
31 Jan 2009
cheers bro, thanks for the help....
Aoedogg

Aoedogg

Branch Unspecified
31 Jan 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

Branch Unspecified
01 Feb 2009
hi jay
i am working on VHDL you have some knowledge of it
$---Jay---$

$---Jay---$

Branch Unspecified
01 Feb 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......
$---Jay---$

$---Jay---$

Branch Unspecified
01 Feb 2009
hai bakshay, yeah i do have knowledge...how can i help u...?
bakshay

bakshay

Branch Unspecified
22 Mar 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

Branch Unspecified
04 Aug 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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