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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: #-Link-Snipped-#

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!

Replies

  • $---Jay---$
    $---Jay---$
    u can use transceiver buffers.....it'll convert the signal to FPGA level...
    use this device SN74LVC8T245 😁
  • Aoedogg
    Aoedogg
    Cheers,

    Can this work from the FPGA to TTL level?
  • $---Jay---$
    $---Jay---$
    yes dude. we are using this chip for our boards.
  • Aoedogg
    Aoedogg
    cheers bro, thanks for the help....
  • Aoedogg
    Aoedogg
    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
    hi jay
    i am working on VHDL you have some knowledge of it
  • $---Jay---$
    $---Jay---$
    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......
  • $---Jay---$
    $---Jay---$
    hai bakshay, yeah i do have knowledge...how can i help u...?
  • bakshay
    bakshay
    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
    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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