DS1249AB Maxim, DS1249AB Datasheet

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DS1249AB

Manufacturer Part Number
DS1249AB
Description
The DS1249 2048k Nonvolatile (NV) SRAMs are 2,097,152-bit, fully static, nonvolatile SRAMs organized as 262,144 words by 8 bits
Manufacturer
Maxim
Datasheet

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19-5631; Rev 11/10
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 70 ns
 Lithium energy source is electrically
 Full ± 10% V
 Optional ± 5% V
 Optional industrial temperature range of
 JEDEC standard 32-pin DIP package
DESCRIPTION
The DS1249 2048k Nonvolatile SRAMs are 2,097,152-bit, fully static, nonvolatile SRAMs organized as
262,144 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry
which constantly monitors V
lithium 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 which can be executed and no
additional support circuitry is required for microprocessor interfacing.
www.maxim-ic.com
absence of external power
loss
disconnected to retain freshness until power is
applied for the first time
(DS1249AB)
-40°C to +85°C, designated IND
CC
operating range (DS1249Y)
CC
operating range
CC
for an out-of-tolerance condition. When such a condition occurs, the
1 of 9
PIN ASSIGNMENT
PIN DESCRIPTION
A0 - A17
DQ0 - DQ7
V
GND
NC
CE
OE
WE
CC
2048k Nonvolatile SRAM
32-Pin ENCAPSULATED PACKAGE
GND
DQ0
DQ1
DQ2
A16
A14
A12
NC
A7
A6
A5
A4
A3
A2
A1
A0
740-mil 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 (+5V)
- Ground
- No Connect
DS1249Y/AB
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
A15
A17
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
CC

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DS1249AB Summary of contents

Page 1

... Full ± 10% V operating range (DS1249Y) CC  Optional ± operating range CC (DS1249AB)  Optional industrial temperature range of -40°C to +85°C, designated IND  JEDEC standard 32-pin DIP package DESCRIPTION The DS1249 2048k Nonvolatile SRAMs are 2,097,152-bit, fully static, nonvolatile SRAMs organized as 262,144 words by 8 bits ...

Page 2

... CC . Should the supply voltage decay, the NV SRAMs CC to the RAM and disconnects the lithium energy source. CC exceeds 4.75 volts for the DS1249AB and 4.5 volts for the CC is first applied at a level greater than DS1249Y/AB signals are active (low) after address ...

Page 3

... DS1249Y/AB -0.3V to +6.0V 0°C to +70°C -40°C to +85°C -40°C to +85°C +260° See Note 10) A TYP MAX UNITS NOTES 5.0 5.25 V 5 ±5% for DS1249AB ±10% for DS1249Y) CC TYP MAX UNITS NOTES µA +2.0 µA +2 1.0 1.5 mA µA 100 150 85 mA 4.62 4 ...

Page 4

... WR1 t 15 WR2 t ODW t 5 OEW DH1 t DH2 DS1249Y/ ±5% for DS1249AB ±10% for DS1249Y) UNITS NOTES MAX ...

Page 5

READ CYCLE SEE NOTE 1 WRITE CYCLE 1 SEE NOTES and DS1249Y/AB ...

Page 6

WRITE CYCLE 2 SEE NOTES and 13 POWER-DOWN/POWER-UP CONDITION SEE NOTE DS1249Y/AB ...

Page 7

POWER-DOWN/POWER-UP TIMING PARAMETER V Fail Detect to and slew from slew from Valid to and Inactive Valid to End of ...

Page 8

... Cycle = 200 ns for operating current All voltages are referenced to ground ORDERING INFORMATION PART TEMP RANGE DS1249AB-70# 0°C to +70°C DS1249AB-70IND# -40°C to +85°C DS1249Y-70# 0°C to +70°C DS1249Y-70IND# -40°C to +85°C #Denotes a RoHS-compliant device that may include lead(Pb) that is exempt under the RoHS requirements. ...

Page 9

... REVISION HISTORY REVISION DATE Updated the storage information, soldering temperature, and lead temperature information in the Absolute Maximum Ratings section; 11/10 removed the -100 MIN/MAX information from the AC Electrical Characteristics table; updated the Ordering Information table (removed - 100 parts and leaded -70 parts); updated the Package Information table ...

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