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Honored ContributorSome question about interconnect with LVTTL and LVPECL
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 Jerry2 Replies
Altera_ForumOnSemi 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- Altera_Forum
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.
