Can Cypress 3.0V FLASH memory with 'Low VCC Lock-out Voltage' operate at a core VCC level of 2.5V?
Most Cypress 3.0V FLASH memory products have a set core VCC voltage range of 2.7V to 3.6V, with the 'Low VCC Lock-out Voltage' feature. Setting any Cypress 3.0V to a core VCC voltage level of 2.5V places the FLASH memory device into the upper range of the "Low VCC Lock-Out Voltage".
The purpose of the “Low VCC Lock-Out Voltage" feature is a hardware data protection measure which detects low VCC level (below 2.7V) that automatically inhibits write operations during power transitions. The "Low VCC Lock-Out Voltage" disables both program and erases operations in any combination of sector groups of memory. This feature protects data from inadvertent program or erases operations.
If the any Cypress 3.0V FLASH memory product is allowed to operate at 2.5V, Cypress certainly cannot guarantee operation at any temperature, since the device is operating outside the specified core VCC voltage range of 2.7V to 3.6V. Therefore, the user/designer assumes all risk and responsibility of imminent catastrophic failure of the target application due to the use of inadequate core VCC voltage level of less than 2.7V.