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PDF DS1345W Data sheet ( Hoja de datos )

Número de pieza DS1345W
Descripción 1024k Nonvolatile SRAM
Fabricantes Dallas Semiconducotr 
Logotipo Dallas Semiconducotr Logotipo



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No Preview Available ! DS1345W Hoja de datos, Descripción, Manual

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DS1345W
3.3V 1024k Nonvolatile SRAM
with Battery Monitor
FEATURES
§ 10 years minimum data retention in the
absence of external power
§ Data is automatically protected during power
loss
§ Power supply monitor resets processor when
VCC power loss occurs and holds processor in
reset during VCC ramp-up
§ Battery monitor checks remaining capacity
daily
§ Read and write access times as fast as 100 ns
§ Unlimited write cycle endurance
§ Typical standby current 50 µA
§ Upgrade for 128k x 8 SRAM, EEPROM or
Flash
§ Lithium battery is electrically disconnected to
retain freshness until power is applied for the
first time
§ Optional industrial temperature range of
-40°C to +85°C, designated IND
§ PowerCap Module (PCM) package
- Directly surface-mountable module
- Replaceable snap-on PowerCap provides
lithium backup battery
- Standardized pinout for all nonvolatile
SRAM products
- Detachment feature on PowerCap allows
easy removal using a regular screwdriver
PIN ASSIGNMENT
BW
A15
A16
RST
VCC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GND VBAT
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
34-Pin PowerCap Module (PCM)
(Uses DS9034PC PowerCap)
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
PIN DESCRIPTION
A0-A16
- Address Inputs
DQ0-DQ7
- Data In/Data Out
CE - Chip Enable
WE - Write Enable
OE - Output Enable
RST - Reset Output
BW - Battery Warning Output
VCC
GND
- Power (+3.3 Volts)
- Ground
NC - No Connect
DESCRIPTION
The DS1345W 3.3V 1024k Nonvolatile SRAM is a 1,048,576-bit, fully static, nonvolatile SRAM
organized as 131,072 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and
control circuitry, which constantly monitors VCC for an out-of-tolerance condition. When such a condition
occurs, the lithium energy source is automatically switched on and write protection is unconditionally
enabled to prevent data corruption. Additionally, the DS1345W has dedicated circuitry for monitoring the
status of VCC and the status of the internal lithium battery. DS1345W devices in the PowerCap Module
package are directly surface mountable and are normally paired with a DS9034PC PowerCap to form a
complete Nonvolatile SRAM module. The devices can be used in place of 128k x 8 SRAM, EEPROM or
Flash components.
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DS1345W pdf
DS1345W
AC ELECTRICAL CHARACTERISTICS (TA: See Note 10) (VCC =3.3V ± 0.3V)
PARAMETER
SYMBOL
DS1345W-100
MIN MAX
DS1345W-150
MAX MIN
UNITS
NOTES
Read Cycle Time
Access Time
tRC 100
150
ns
tACC 100 150 ns
OE to Output Valid
tOE
50 70 ns
CE to Output Valid
tCO
100 150 ns
OE or CE to Output Active
tCOE
5
5 ns 5
Output High Z
from Deselection
tOD
35
35 ns
5
Output Hold from
Address Change
tOH 5
5 ns
Write Cycle Time
Write Pulse Width
Address Setup Time
Write Recovery Time
tWC
tWP
tAW
tWR1
tWR2
100
75
0
5
20
150
100
0
5
20
ns
ns 3
ns
ns
12
13
Output High Z from WE
tODW
35
35 ns
5
Output Active from WE
tOEW
5
5 ns 5
Data Setup Time
Data Hold Time
tDS 40 60 ns 4
tDH1
0
tDH2 20
0
20
ns
12
13
READ CYCLE
SEE NOTE 1
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DS1345W arduino
DS1345W
DS1345W NONVOLATILE SRAM, 34-PIN POWERCAP MODULE WITH
POWERCAP
PKG
DIM
A
B
C
D
E
F
G
INCHES
MIN NOM MAX
0.920 0.925 0.930
0.955 0.960 0.965
0.240 0.245 0.250
0.052 0.055 0.058
0.048 0.050 0.052
0.015 0.020 0.025
0.020 0.025 0.030
ASSEMBLY AND USE
Reflow soldering
Dallas Semiconductor recommends that
PowerCap Module bases experience one
pass through solder reflow oriented
label-side up (live-bug).
Hand soldering and touch-up
Do not touch soldering iron to leads for
more than 3 seconds. To solder, apply
flux to the pad, heat the lead frame pad
and apply solder. To remove part, apply
flux, heat pad until solder reflows, and
use a solder wick.
LPM replacement in a socket
To replace a Low Profile Module in a
68-pin PLCC socket, attach a
DS9034PC PowerCap to a module base
then insert the complete module into the
socket one row of leads at a time,
pushing only on the corners of the cap.
Never apply force to the center of the
device. To remove from a socket, use a
PLCC extraction tool and ensure that it
does not hit or damage any of the
module IC components. Do not use any
other tool for extraction.
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