Short for Electrically Erasable Programmable ROM, EEPROMs are a type of non-volatile memory that allows data to be written to each address via electric signals. ROHM EEPROMs are capable of an industry best 1 million rewrites and retains data for up to 40 years. ROHM's unique double cell technology has been incorporated into the entire lineup, resulting in remarkably high reliability (zero accidental defects).
ROHM's unique high-reliability memory cell construction. Generally, with competitors, one memory cell is allocated to each bit, resulting in data corruption if the memory cell becomes defective. ROHM, on the other hand, allocates two cells for each bit. If one cell becomes defective the other takes over, preventing data corruption, protecting the customer's important data.
This is when a defect occurs by chance in a memory cell during normal operation, resulting in memory corruption. There are limitations on the number of times an EEPROM memory cell can be rewritten. ROHM guarantees the highest number of rewrites: 1 million times. Companies normally do not normally guarantee a chance defect will not occur within a number of times - they only confirm that all bits are normal at shipping. ROHM has developed double-cell construction to reduce the rate of chance defects for greater data reliability.
Not 100% tested' indicates that testing is not performed during final shipping inspection. However, design assurances have been built in during development, ensuring adequate margin regarding rated values and characteristics by taking into account manufacturing variances.