Cyclone® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683375
Date 10/18/2023
Document Table of Contents LVPECL Termination

The Cyclone® V devices support the LVPECL I/O standard on input clock pins only:

  • LVPECL input operation is supported using LVDS input buffers.
  • LVPECL output operation is not supported.
Use AC coupling if the LVPECL common-mode voltage of the output buffer does not match the LVPECL input common-mode voltage.
Note: Altera recommends that you use IBIS models to verify your LVPECL AC/DC-coupled termination.
Figure 98. LVPECL AC-Coupled Termination

Support for DC-coupled LVPECL is available if the LVPECL output common mode voltage is within the Cyclone® V LVPECL input buffer specification.

Figure 99. LVPECL DC-Coupled Termination

For information about the VICM specification, refer to the device datasheet.