Some question about interconnect with LVTTL and LVPECL

Question

Hello everyone:

I am using a D flip-flop chip of ON semiconductor, attached is the datasheet. All of this chip's IO are ECL type. I have to control some pins (such as reset pin) from FPGA, so there is a issue of how to drive LVPECL using LVTTL signal?

A simple LVTTL to LVPECL interface without interface IC ?

Any info ?

If I want a single ended output from a LVPECL,can I leave

the other differential output open (unconnected) ?

Thanks

Jerry

altera_forum · Answer

Level conversion from 3.3V or 2.5V FPGA IOs to LVPECL can be done with resistive voltage dividers. For LVPECL to FPGA interface, use resistors and LVDS inputs.

altera_forum · Answer

OnSemi conductor (Motorola ECL) has some good app notes. This one shows LVDS interfacing to LVPECL

http://www.onsemi.com/pub_link/collateral/an1568-d.pdf

while this one has translators

http://www.onsemi.com/pub_link/collateral/an1672-d.pdf

Perhaps those will be useful.

Cheers,

Dave

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Some question about interconnect with LVTTL and LVPECL

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