User Guide

3 Page EEPROM data retention
3.1 Definition
At t
0
, bytes are written, after what no page write or erase operations are executed on these bytes. The data
retention time is the time after t
0
during which the bytes can still be correctly read (the page EEPROM devices
being DC supplied or not).
3.2 Data retention and temperature dependence
Page EEPROMs data retention is temperature dependent. The higher is the temperature the lower is the data
retention time.
The next figures show the data retention compared to the temperature for
• Read-only data (
Figure 4)
• Cycled data (
Figure 5)
Figure 4. Page EEPROM data retention time vs temperature (Read-only data)
At average 40°C, the read-only data programmed in a page EEPROM product can be read for 100 years.
AN5866
Page EEPROM data retention
AN5866 - Rev 1
page 6/14