DS1244 Maxim, DS1244 Datasheet - Page 13

• Manufacturer Part Number: DS1244
• Description: The DS1244 256k NV SRAM with a Phantom clock is a fully static nonvolatile RAM (NV SRAM) (organized as 32k words by 8 bits) with a built-in real-time clock
• Manufacturer: Maxim

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
P ARAMETER
1 6 B
P ARAMETER
6 B
CE
CE
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
13 of 20
1.5
10
0
0
TYP
TYP
Over the operating range (3.3V)
MAX
MAX
2.5
UNITS
UNITS
years
ms
µs
µs
µs
(T
A
= +25°C)
NOTES
NOTES
9