3.3V LVPECL into a LVPECL_25, VCCO-2.5V on a Virtex-4

Dec 15, 2006 1 Replies

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Dale 19 years ago

I want to drive a LVPECL_25 input on a bank with VCCO=2.5V with a 3.3V LVPECL signal. Xilinx has a nice app note on doing this with a Virtex ii and a Spartan 3, but I can't find anything concrete about doing it on a Virtex-4. Would you agree that it's safe to implement the same solution on a Virtex-4?

Here's the app note:

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See page 4.

It's just a voltage divider. Are there any adverse effects to this?

Thanks, Dale

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Austin Lesea 19 years ago

Dale,

This will work.

Some care is required to keep everything short (try not to create stubs that cause reflections). Figure 4 is the DC divider, or Figure 6 is the AC coupling solution (both will work). AC coupling may be an issue if the signals are not balanced (more 0's than 1's or more 1's than 0's).

Works for S3, S3E, S3A, V4 and V5.

Austin (Xilinx ICDES)

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