Rainbow-electronics DS14287 Manuel d'utilisateur télécharger pdf (Page 21)

DS14285/DS14287

21 of 25

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

)

300

µs

slew from 0V to 4.5V (CS at V

)

100

µs

CS at V

after Power-Up

REC

20 200 ms

Chip Enable Propagation Delay to

External SRAM

CED

10 ns

= 25°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Expected Data Retention for DS14287 t

10 years 10

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

backup mode.

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Rainbow-electronics DS14287 Manuel d'utilisateur Page 21