DS1249W Maxim, DS1249W Datasheet

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DS1249W

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
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
DS1249W-100#
Manufacturer:
DALLAS
Quantity:
241
FEATURES
 10 years minimum data retention in the
 Data is automatically protected during power
 Unlimited write cycles
 Low-power CMOS operation
 Read and write access times of 100ns
 Lithium energy source is electrically
 Optional industrial (IND) temperature range
 JEDEC standard 32-pin DIP package
DESCRIPTION
The DS1249W 2048kb nonvolatile (NV) SRAMs are 2,097,152-bit, fully static, NV SRAMs organized as
262,144 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry
that constantly monitors V
energy source is automatically switched on and write protection is unconditionally enabled to prevent
data corruption. There is no limit on the number of write cycles that can be executed, and no additional
support circuitry is required for microprocessor interfacing.
www.maxim-ic.com
19-5633; Rev 11/10
absence of external power
loss
disconnected to retain freshness until power is
applied for the first time
of -40°C to +85°C
CC
for an out-of-tolerance condition. When such a condition occurs, the lithium
1 of 8
PIN ASSIGNMENT
PIN DESCRIPTION
A0–A17
DQ0–DQ7
V
GND
NC
CE
WE
OE
3.3V 2048kb Nonvolatile SRAM
CC
GND
DQ0
DQ1
DQ2
A16
A14
A12
NC
A7
A6
A5
A4
A3
A2
A1
A0
32-Pin Encapsulated Package
740mil Extended
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Power (+3.3V)
- Ground
- No Connect
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
DS1249W
V
A15
A17
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
CC

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DS1249W Summary of contents

Page 1

... JEDEC standard 32-pin DIP package DESCRIPTION The DS1249W 2048kb nonvolatile (NV) SRAMs are 2,097,152-bit, fully static, NV SRAMs organized as 262,144 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry that constantly monitors V for an out-of-tolerance condition. When such a condition occurs, the lithium ...

Page 2

... However, if the output drivers are enabled ( will disable the outputs in t ODW DATA-RETENTION MODE The DS1249W provides full functional capability for V 2.8V. Data is maintained in the absence of V static RAMs constantly monitor V write protects themselves, all inputs become “don’t care,” and all outputs become high impedance falls below approximately 2 ...

Page 3

... CCS1 I CCS2 I CCO1 V 2.8 TP SYMBOL MIN I DS1249W -0.3V to +4.6V 0°C to +70°C -40°C to +85°C -40°C to +85°C +260° See Note 10) A TYP MAX UNITS NOTES 3.3 3 +0.4 V ± = 3.3V CC TYP MAX UNITS NOTES µ ...

Page 4

... COE 100 WR1 t 20 WR2 t ODW t 5 OEW DH1 t 20 DH2 DS1249W = 3.3V ± 0.3V) CC UNITS NOTES MAX ns 100 100 ...

Page 5

... WRITE CYCLE 1 SEE NOTES and 12 WRITE CYCLE 2 SEE NOTES and DS1249W ...

Page 6

... going high going high See Note 10) A TYP MAX UNITS µs 1.5 µs µ 125 TYP MAX UNITS years is measured from the latter of low transition in Write WE DS1249W NOTES 11 = +25°C) NOTES ...

Page 7

... WE WE the output buffers remain in a high-impedance state during this period. 9. Each DS1249W 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 8

... Updated the storage information, soldering temperature, and lead temperature information in the Absolute Maximum Ratings section; 11/10 removed the -150 MIN/MAX information from the AC Electrical Characteristics table; updated the Ordering Information table (removed - 150 parts and leaded -100 parts); added the Package Information table DESCRIPTION DS1249W PAGES CHANGED ...

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