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AR# 24962

CPLD CoolRunner-II/XPLA3/9500/XL/XV- What happens if Vcc falls below its minimum and then powers up again?


What happens if Vcc falls below its minimum allowed level and then powers up again?


If Vcc falls below the Vcc minimum, the CPLD should be powered down to below 0.25V for more than 100 mS before being brought back up. This will allow sufficient time for internal capacitance to discharge and the part to properly reconfigure.

The minimum Vcc for each device can be found in their relevant data sheet:


AR# 24962
Date 12/15/2012
Status Active
Type General Article