Power down / power up timing, Ta=25°c), Warning – Rainbow Electronics DS12C887 User Manual
Page 18
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DS12C887
18 of 19
POWER DOWN / POWER UP TIMING
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
CS
at V
IH
before Power-
Down
t
PD
0
µ
s
V
CC
slew from 4.5V to 0V
(
CS
at V
IH
)
t
F
4.0
≤
V
CC
≤
4.5V
300
µ
s
V
CC
slew from 0V to 4.5V
(
CS
at V
IH
)
t
R
100
µ
s
CS
at V
IH
after Power-Up
t
REC
20
200
ms
Expected Data Retention
t
DR
10
years
10,11
(tA=25°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Expected Data Retention
t
DR
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
DR
.
Warning:
Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery
back-up mode.
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