Article ID: 000083421 Content Type: Troubleshooting Last Reviewed: 10/13/2016

Is there a problem if a floating voltage exists on VCC_AUX before it is ramped in Arria V, Cyclone V, Stratix IV, and Stratix V devices?

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Description

No, there is no problem if a floating voltage exists on VCC_AUX before it is ramped in Arria® V, Cyclone® V, Stratix® IV, and Stratix V devices.  Leakage can occur between VCC and VCC_AUX when VCC_AUX is ramped after VCC.  This is an expected behavior in these device families. 

 

The leakage occurs through the passgate transistors causing VCC_AUX to float to approximately 0.6V prior to the power supply ramping up.  0.6V is below the power on reset (POR) trip point. This will cause no functional failure or any reliability concern to the device.

 

This can only be observed if VCC is powered up before VCC_AUX and the regulators were designed to leave the power supplies to float before they ramp up.

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This article applies to 13 products

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