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  • FPGA --> TTL Buffer

    Aoedogg

    Member

    Updated: Oct 26, 2024
    Views: 1.1K
    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!
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Replies

  • $---Jay---$

    Member • Jan 30, 2009

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

    Member • Jan 30, 2009

    Cheers,

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

    Member • Jan 30, 2009

    yes dude. we are using this chip for our boards.
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  • Aoedogg

    Member • Jan 30, 2009

    cheers bro, thanks for the help....
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  • Aoedogg

    Member • 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!
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  • bakshay

    Member • Feb 1, 2009

    hi jay
    i am working on VHDL you have some knowledge of it
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  • $---Jay---$

    Member • 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......
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  • $---Jay---$

    Member • Feb 1, 2009

    hai bakshay, yeah i do have knowledge...how can i help u...?
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  • bakshay

    Member • 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
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  • rajani2509

    Member • 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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