Rainbow Electronics DS1258Y_AB User Manual
Page 7
DS1258Y/AB
100395 7/9
POWER-DOWN/POWER-UP CONDITION
V
CC
3.2V
t
F
t
PD
t
R
t
REC
DATA RETENTION
TIME
t
DR
LEAKAGE CURRENT
I
L
SUPPLIED FROM
LITHIUM CELL
WE, CEU, CEL
DS1230Y 4.50V
DS1230AB 4.75V
SEE NOTE 11
POWER-DOWN/POWER-UP TIMING
(t
A
: See Note 10)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
CEU, CEL, WE at V
IH
before
Power-Down
t
PD
0
m
s
11
V
CC
Slew from V
TP
to 0V
t
F
300
m
s
V
CC
Slew from 0V to V
TP
t
R
300
m
s
CEU, CEL or at V
IH
after
Power-Up
t
REC
2
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.
NOTES:
1. WE is high for a read cycle.
2. OE = V
IH
or V
IL
. If OE = V
IH
during write cycle, the output buffers remain in a high impedance state.
3. t
WP
is specified as the logical AND of CEU or CEL and WE. t
WP
is measured from the latter of CEU, CEL or
WE going low to the earlier of CEU, CEL or WE going high.