Article ID: 000084137 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Do Cyclone III devices support On Chip Termination (OCT) for 3.3V LVCMOS/3.3V LVTTL I/O standards?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

No, Cyclone® III devices do not support OCT for 3.3V LVCMOS or 3.3V LVTTL I/O standards.

Due to the limited current strength of the 3.3V I/O buffer configuration, the output impedance can not meet the 25 Ohm or 50 Ohm OCT settings.

To interface Cyclone III devices with 3.3, 3.0, or 2.5 V systems, you can follow the guidelines provided in AN 447: Interfacing Cyclone III Devices with 3.3/3.0/2.5-V LVTTL/LVCMOS I/O Systems (PDF).

Related Products

This article applies to 1 products

Cyclone® III FPGAs

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