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Data Retention Lifetime |
| The ZEROPOWER Data Retention Lifetime is determined by two factors: |
| • |
The battery becoming discharged, having provided current
to the SRAM in the battery back-up mode. |
| • |
The effects of aging causing the cell to become inoperative
before the stored charge has been fully consumed. |
|
| The first effect is known as Capacity Consumption and the second
as Storage Life (which is primarily a function of temperature).
The two effects have very little influence on each other, being
independent but operating simultaneously. The data retention lifetime
of the device is determined by whichever occurs first. |
| ' |
| Choice of Package |
| ZEROPOWER devices are packaged in a 600mil DIP CAPHAT™ or
a 330mil SOIC SNAPHAT®, the SNAPHAT having a removable
top that includes the long life lithium cell. If a data retention
lifetimes greater than calculated is required, the user is advised
to select the SNAPHAT package. As the battery reaches the end of
its useful life, it is possible to remove the SNAPHAT top containing
the nearly expended cell, and to replace it with a fresh unit. No
data will be lost during the process, provided that the board remains
powered-up during the operation. |
| ' |
| ZEROPOWER Data Retention Calculation |
| Select the package required and click OK. For CAPHAT select the
required part number to display Data Retention Lifetime information.
For SOIC and SNAPHAT select the part number, temperature rating
and battery type then click where indicated to display Data Retention
Lifetime information. |
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