Rainbow-electronics DS12887 Manual do Utilizador descarregar pdf (Página 19)

DS12887

19 of 19

Figure 9. POWER-UP/DOWN TIMING

POWER-UP/DOWN TIMING

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

CS at V

before Power-Down

Slew from 4.5V to 0V ( CS at V

)

300

Slew from 0V to 4.5V ( CS at V

)

100

CS at V

after Power-Up

REC

20 200 ms

= +25°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Expected Data Retention t

10 years

Note: The RTC keeps time to an accuracy of ±1 minute per month during data retention time for the

period of t

Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is

in battery-backup mode.

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Rainbow-electronics DS12887 Manual do Utilizador Página 19