DS1249W Maxim, DS1249W Datasheet - Page 6

• Manufacturer Part Number: DS1249W
• Description: The DS1249W 2048kb nonvolatile (NV) SRAMs are 2,097,152-bit, fully static, NV SRAMs organized as 262,144 words by 8 bits
• Manufacturer: Maxim

POWER-DOWN/POWER-UP CONDITION
POWER-DOWN/POWER-UP TIMING
WARNING:
Under no circumstance are negative undershoots, of any amplitude, allowed when device is in battery
backup mode.
NOTES:
1.
2.
3. t
4. t
5. These parameters are sampled with a 5pF load and are not 100% tested.
6. If the
V
V
V
V
V
Expected Data-Retention Time
CC
CC
CC
CC
CC
going low to the earlier of
Cycle 1, the output buffers remain in a high-impedance state during this period.
WE
OE
WP
DS
Fail Detect to
Slew from V
Slew from 0V to V
Valid to
Valid to End of Write Protection
is measured from the earlier of
is specified as the logical AND of
= V
is high for a read cycle.
CE
IH
PARAMETER
PARAMETER
or V
CE
low transition occurs simultaneously with or latter than the
SEE NOTE 11
TP
and
IL
. If
CE
to 0V
WE
OE
and
TP
Inactive
= V
WE
CE
IH
Inactive
during write cycle, the output buffers remain in a high impedance state.
or
WE
CE
going high.
or
SYMBOL
SYMBOL
CE
WE
t
t
t
t
REC
and
t
t
DR
PD
PU
R
F
going high.
6 of 8
WE
. t
MIN
MIN
150
150
WP
10
is measured from the latter of
TYP
TYP
MAX
MAX
125
WE
1.5
2
low transition in Write
(T
A
UNITS
UNITS
: See Note 10)
years
ms
ms
µs
µs
µs
(T
A
= +25°C)
CE
NOTES
NOTES
DS1249W
or
11
9
WE