DS1345Y Maxim, DS1345Y Datasheet - Page 8

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DS1345Y

Manufacturer Part Number
DS1345Y
Description
The DS1345 1024k Nonvolatile (NV) SRAMs are 1,048,576-bit, fully static, NV SRAMs organized as 131,072 words by 8 bits
Manufacturer
Maxim
Datasheet

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POWER-DOWN/POWER-UP TIMING
BATTERY WARNING 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
7. If the
8. If
PARAMETER
V
V
V
V
V
V
V
V
PARAMETER
Battery Test Cycle
Battery Test Pulse Width
Battery Test to
PARAMETER
Expected Data Retention Time
CC
CC
CC
CC
CC
CC
CC
CC
going low to the earlier of
buffers remain in a high-impedance state during this period.
buffers remain in high-impedance state during this period.
the output buffers remain in a high impedance state during this period.
WE
OE
WP
DS
Fail Detect to
slew from V
Fail Detect to
slew from 0V to V
Valid to
Valid to End of Write Protection
Valid to
Valid to
WE
is measured from the earlier of
is specified as the logical AND of
= V
is high for a Read Cycle.
CE
CE
is low or the
IH
or V
low transition occurs simultaneously with or latter than the
high transition occurs prior to or simultaneously with the
CE
RST
BW
BW
TP
and
IL
Valid
Inactive
. If
CE
RST
to 0V
Active
WE
OE
and
TP
WE
Active
Inactive
= V
WE
low transition occurs prior to or simultaneously with the
CE
IH
Inactive
during write cycle, the output buffers remain in a high-impedance state.
or
WE
CE
going high.
or
SYMBOL
SYMBOL
SYMBOL
CE
WE
t
t
t
t
t
t
BTPW
t
t
t
t
RPD
REC
RPU
BPU
BTC
and
t
BW
t
DR
PD
PU
R
F
going high.
WE
8 of 10
. t
MIN
MIN
MIN
150
150
150
WP
10
is measured from the latter of
TYP
TYP
TYP
200
24
WE
WE
MAX
MAX
MAX
125
350
1.5
15
2
1
1
1
high transition, the output
low transition, the output
(T
(T
A
A
UNITS
UNITS
UNITS
: See Note 10)
: See Note 10)
CE
years
ms
ms
ms
µs
µs
µs
µs
hr
(T
s
s
s
low transition,
A
DS1345Y/AB
= +25°C)
CE
NOTES
NOTES
NOTES
or
11
14
14
14
9
WE

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