DS1245W Maxim, DS1245W Datasheet

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DS1245W

Manufacturer Part Number
DS1245W
Description
The DS1245W 3
Manufacturer
Maxim
Datasheet

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FEATURES
 10 years minimum data retention in the
 Data is automatically protected during power
 Replaces 128k x 8 volatile static RAM,
 Unlimited write cycles
 Low-power CMOS
 Read and write access times of 100ns
 Lithium energy source is electrically
 Optional industrial temperature range of
 JEDEC standard 32-pin DIP package
 PowerCap Module (PCM) package
www.maxim-ic.com
19-5640; Rev 11/10
absence of external power
loss
EEPROM or Flash memory
disconnected to retain freshness until power is
applied for the first time
-40°C to +85°C, designated IND
-
-
-
-
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
1 of 10
PIN ASSIGNMENT
PIN DESCRIPTION
A0 - A16
DQ0 - DQ7
V
GND
NC
CE
WE
OE
CC
3.3V 1024k Nonvolatile SRAM
GND
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
A15
A16
WE
V
NC
NC
OE
CE
CC
(Uses DS9034PC+ or DS9034PCI+ PowerCap)
GND
DQ0
DQ1
DQ2
A16
A14
A12
NC
A7
A6
A5
A4
A3
A2
A1
A0
32-PIN Encapsulated Package
34-Pin PowerCap Module (PCM)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
740-Mil Extended
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GND V
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Power (+3.3V)
- Ground
- No Connect
BAT
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
DS1245W
V
A15
NC
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
CC
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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DS1245W Summary of contents

Page 1

... PowerCap Module (PCM) (Uses DS9034PC+ or DS9034PCI+ PowerCap) PIN DESCRIPTION A0 - A16 - Address Inputs DQ0 - DQ7 - Data In/Data Out - Chip Enable CE - Write Enable WE - Output Enable Power (+3.3V) CC GND - Ground Connect DS1245W A15 A13 A11 A10 ...

Page 2

... PACKAGES The DS1245W is available in two packages: 32-pin DIP and 34-pin PowerCap Module (PCM). The 32- pin DIP integrates a lithium battery, an SRAM memory and a nonvolatile control function into a single package with a JEDEC-standard 600-mil DIP pinout. The 34-pin PowerCap Module integrates SRAM for an out-of-tolerance condition ...

Page 3

... DS9034PC PowerCap. The PowerCap Module package design allows a DS1245W PCM device to be surface mounted without subjecting its lithium backup battery to destructive high- temperature reflow soldering. After a DS1245W module base is reflow soldered, a DS9034PC PowerCap is snapped on top of the base to form a complete Nonvolatile SRAM module ...

Page 4

... See Note 10) A TYP MAX UNITS 3 See Note 10) (V =3.3V CC TYP MAX UNITS µA +1.0 µA +1 µA 50 250 µA 30 150 50 mA 2.9 3.0 V TYP MAX UNITS DS1245W +260°C +260°C NOTES NOTES NOTES ...

Page 5

... COE 100 WR1 t 20 WR2 t ODW t 5 OEW DH1 t 20 DH2 DS1245W = 3.3V ±0.3V) CC UNITS NOTES MAX ns 100 100 ...

Page 6

... WRITE CYCLE 1 SEE NOTES AND DS1245W ...

Page 7

... WRITE CYCLE 2 SEE NOTES AND 12 \ POWER-DOWN/POWER-UP CONDITION DS1245W ...

Page 8

... WE WE the output buffers remain in a high impedance state during this period. 9. Each DS1245W 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

... Output: 1.5V Input pulse Rise and Fall Times: 5ns SUPPLY TOLERANCE 3.3V ± 0.3V 3.3V ± 0.3V 3.3V ± 0.3V 3.3V ± 0.3V OUTLINE NO. MDT32+6 21-0245 PC2+3 21-0246 DS1245W PIN- SPEED GRADE PACKAGE (ns) 32 740 EDIP 100 34 PowerCap* 100 32 740 EDIP 100 34 PowerCap* 100 Note that a “+”, LAND PATTERN NO. ...

Page 10

... Absolute Maximum Ratings section; removed the -150 MIN/MAX information from the AC Electrical 11/10 Characteristics table; updated the Ordering Information table (removed -150 parts and leaded -100 parts); removed the PowerCap module drawings and updated the Package Information table DESCRIPTION DS1245W PAGES CHANGED ...

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