DS1244W-120 DALLAS [Dallas Semiconductor], DS1244W-120 Datasheet - Page 12

• Manufacturer Part Number: DS1244W-120
• Description: 256k NV SRAM with Phantom Clock
• Manufacturer: DALLAS [Dallas Semiconductor]

POWER-DOWN/POWER-UP TIMING
V
V
V
V
Expected Data Retention Time
Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is
in battery-backup mode.
CE
CE
CC
PF(MIN)
CC
PF(MIN)
at V
at V
Slew from V
Slew from V
(
(
IH
IH
PARAMETER
CE
CE
PARAMETER
before Power-Down
after Power-Up
at V
at V
IH
IH
PF(MAX)
PF(MAX)
)
)
to
to
SYMBOL
SYMBOL
t
t
t
REC
t
t
DR
PD
R
F
MIN
MIN
300
12 of 19
1.5
10
0
0
TYP
TYP
Over the operating range (3.3V)
MAX
MAX
2.5
UNITS
UNITS
years
ms
m s
m s
m s
(T
A
= +25°C)
NOTES
NOTES
9