M41ST85W datasheet(18/41 Pages) STMICROELECTRONICS

Teilenummer	M41ST85W

Bauteilbeschribung	3.0/3.3V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor

PDF	41 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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18 / 41 page

Operating modes

M41ST85W

18/41

If data retention lifetime is a critical parameter for the system, it is important to review the

data retention current specifications for the particular SRAMs being evaluated. Most SRAMs

specify a data retention current at 3.0 volts. Manufacturers generally specify a typical

condition for room temperature along with a worst case condition (generally at elevated

temperatures). The system level requirements will determine the choice of which value to

use. The data retention current value of the SRAMs can then be added to the IBAT value of

the M41ST85W to determine the total current requirements for data retention. The available

battery capacity for the SNAPHAT® top of your choice can then be divided by this current to

determine the amount of data retention available (see Table 19 on page 39).

For a further more detailed review of lifetime calculations, please see Application Note

AN1012.

M41ST85W Datenblatt(PDF) 18 Page - STMicroelectronics