DS1345W Maxim, DS1345W Datasheet

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DS1345W

Manufacturer Part Number
DS1345W
Description
The DS1345W 3
Manufacturer
Maxim
Datasheet

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19-5587; Rev 10/10
FEATURES
 10 years minimum data retention in the
 Data is automatically protected during power
 Power supply monitor resets processor when
 Battery monitor checks remaining capacity
 Read and write access times of 100 ns
 Unlimited write cycle endurance
 Typical standby current 50 µA
 Upgrade for 128k x 8 SRAM, EEPROM or
 Lithium battery is electrically disconnected to
 Optional industrial temperature range of
 PowerCap Module (PCM) package
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 V
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 V
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.
www.maxim-ic.com
absence of external power
loss
V
reset during V
daily
Flash
retain freshness until power is applied for the
first time
-40°C to +85°C, designated IND
CC
- Directly surface-mountable module
- Replaceable snap-on PowerCap provides
- Standardized pinout for all nonvolatile
- Detachment feature on PowerCap allows
lithium backup battery
SRAM products
easy removal using a regular screwdriver
power loss occurs and holds processor in
CC
and the status of the internal lithium battery. DS1345W devices in the PowerCap Module
CC
ramp-up
CC
for an out-of-tolerance condition. When such a condition
1 of 10
PIN ASSIGNMENT
PIN DESCRIPTION
A0-A16
DQ0-DQ7
V
GND
NC
CE
WE
OE
RST
BW
GND
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
RST
A15
A16
CC
BW
V
WE
OE
CE
CC
(Uses DS9034PC+ or DS9034PCI+ PowerCap)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
3.3V 1024k Nonvolatile SRAM
34-Pin PowerCap Module (PCM)
GND V
with Battery Monitor
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Reset Output
- Battery Warning Output
- Power (+3.3 Volts)
- Ground
- No Connect
BAT
DS1345W
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0

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DS1345W Summary of contents

Page 1

... Additionally, the DS1345W has dedicated circuitry for monitoring the status of V and the status of the internal lithium battery. DS1345W devices in the PowerCap Module CC package are directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete Nonvolatile SRAM module ...

Page 2

... On power up, RST during power-on transients and to allow t BATTERY MONITORING The DS1345W automatically performs periodic battery voltage monitoring on a 24-hour time interval. Such monitoring begins within t occurs. After each 24-hour period has elapsed, the battery is connected to an internal 1MΩ test resistor for 1 second ...

Page 3

... The 34-pin PowerCap Module integrates SRAM memory and nonvolatile control into a module base along with contacts for connection to the lithium battery in the DS9034PC PowerCap. The PowerCap Module package design allows a DS1345W device to be surface mounted without subjecting its lithium backup battery to destructive high-temperature reflow soldering. After a DS1345W is reflow soldered, a DS9034PC is snapped on top of the PCM to form a complete Nonvolatile SRAM module ...

Page 4

... CCS1 I 30 CCS2 I CCO1 V 2.8 2.9 TP SYMBOL MIN TYP I DS1345W -0.3V to +4.6V 0°C to +70°C -40°C to +85°C -55°C to +125°C +260°C +260° See Note 10) A MAX UNITS NOTES 3 0.4 V ± = 3.3V 0.3V) CC MAX UNITS NOTES +1.0 µ ...

Page 5

... COE 100 WR1 t 20 WR2 t ODW t 5 OEW DH1 t 20 DH2 DS1345W ± =3.3V CC UNITS NOTES MAX ns 100 100 0.3V ...

Page 6

... WRITE CYCLE 1 SEE NOTES AND 12 WRITE CYCLE 2 SEE NOTES AND DS1345W ...

Page 7

... POWER-DOWN/POWER-UP CONDITION BATTERY WARNING DETECTION SEE NOTE DS1345W ...

Page 8

... WE WE the output buffers remain in a high impedance state during this period. 9. Each DS1345W has a built-in switch that disconnects the lithium source until V the user. The expected t DR time power is first applied by the user. ...

Page 9

... RoHS status. PACKAGE TYPE PACKAGE CODE 34 PCAP going high. WE going high. CE TEMP RANGE TOLERANCE 3.3V ± 0.3V 0°C to +70°C 3.3V ± 0.3V -40°C to +85°C OUTLINE NO. PC2 ® ) under file E99151. SUPPLY PIN-PACKAGE 34 PCAP* 34 PCAP* LAND PATTERN NO. 21-0246 DS1345W Note — ...

Page 10

... © 2010 Maxim Integrated Products DESCRIPTION Maxim and the Dallas logo are registered trademarks of Maxim Integrated Products, Inc. DS1345W PAGES CHANGED ...

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