DS14285-DS14287 DALLAS [Dallas Semiconductor], DS14285-DS14287 Datasheet - Page 21

• Manufacturer Part Number: DS14285-DS14287
• Description: Real Time Clock with NV RAM Control
• Manufacturer: DALLAS [Dallas Semiconductor]

POWER-DOWN/POWER-UP TIMING
POWER-DOWN/POWER-UP TIMING
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.
PARAMETER
V
V
Chip Enable Propagation Delay to
External SRAM
PARAMETER
Expected Data Retention for DS14287
CS
CS
CC
CC
at V
at V
slew from 4.5V to 0V (
slew from 0V to 4.5V (
IH
IH
before Power-Down
after Power-Up
DR
.
CS
CS
at V
at V
IH
IH
)
)
SYMBOL
SYMBOL
t
t
t
t
REC
CED
t
t
DR
PD
R
F
21 of 25
MIN
MIN
300
100
20
10
0
TYP
TYP
MAX
MAX
200
10
UNITS
UNITS
years
ms
ns
s
s
s
DS14285/DS14287
(t
A
NOTES
NOTES
= 25 C)
10