Datasheet

DS1225AB/AD
6 of 9
POWER-DOWN/POWER-UP CONDITION
SEE NOTE 11
POWER-DOWN/POWER-UP TIMING (T
A
: See Note 10)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
V
CC
Fail Detect to
CE
and
WE
Inactive
t
PD
1.5
µs
11
V
CC
slew from V
TP
to 0V t
F
300
µs
V
CC
slew from 0V to V
TP
t
R
300
µs
V
CC
Valid to
CE
and
WE
Inactive
t
PU
2 ms
V
CC
Valid to End of Write Protection t
REC
125 ms
(T
A
= +25°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Expected Data Retention Time
t
DR
10
years
9
WARNING:
Under no circumstance are negative undershoots, of any amplitude, allowed when device is in battery
backup mode.