Rainbow-electronics DS12C887 Manual de usuario descargar pdf (Pagina 18)

DS12C887

18 of 19

POWER DOWN / POWER UP TIMING

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

CS at V

before Power-

Down

µs

slew from 4.5V to 0V

(

CS at V

)

4.0 ≤ V

≤

4.5V

300

µs

slew from 0V to 4.5V

(

CS at V

)

100

µs

CS at V

after Power-Up

REC

20 200 ms

Expected Data Retention t

10 years 10,11

(tA=25°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Expected Data Retention t

10 years 10,11

Note:

The real time clock will keep 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

back-up mode.

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Rainbow-electronics DS12C887 Manual de usuario Pagina 18