Rainbow Electronics DS12887 - Manual (Page 19)

DS12887
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Figure 9. POWER-UP/DOWN TIMING
POWER-UP/DOWN TIMING
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
CS at V
IH
before Power-Down
t
PD
0 ms
V
CC
Slew from 4.5V to 0V ( CS at V
IH
)
t
F
300 ms
V
CC
Slew from 0V to 4.5V ( CS at V
IH
)
t
R
100 ms
CS at V
IH
after Power-Up
t
REC
20 200 ms
( T
A
= +25°C )
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Expected Data Retention t
DR
10 years
Note: The RTC keeps time to an accuracy of ±1 minute per month during data retention time for the
period of t
DR
.
Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is
in battery-backup mode.