What happens if VCC is connected to 5.0 V when the Use Low-Voltage Configuration EPROM option has been selected in the MAX PLUS® II software before compilation or vice versa?

There are two main reasons for such a recommendation:

• The configuration device has two different input drivers that are selected depending on the choice of Use Low-Voltage Configuration EPROM bit in the programming file. Making a selection for Use Low-Voltage Configuration EPROM and providing a V_CC of 5.0 V, or vice versa, will select the inappropriate driver and thus make your circuit more susceptible to configuration failure.
• The conflict between the operating and specified voltage results in an unexpected voltage level for the internal oscillator of the configuration device. This may result in an unpredictable operation of the oscillator, causing a configuration failure.