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Maxim > Products > Memories: Volatile, NV, Multi-Function 
DS1249AB, DS1249Y
2048k Nonvolatile SRAM


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Data Sheet
FULL DATA SHEET (PDF, 196kB)
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Description
The DS1249 2048k Nonvolatile (NV) 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 VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is utomatically 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.

Key Features
  • 10 years minimum data retention in the absence of external power
  • Data is automatically protected during power loss
  • Unlimited write cycles
  • Low-power CMOS operation
  • Read and write access times as fast as 70ns
  • Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
  • Full ±10% VCC operating range (DS1249Y)
  • Optional ±5% VCC operating range (DS1249AB)
  • Optional industrial temperature range of -40°C to +85°C; designated IND
  • JEDEC standard 32-pin DIP package

Key Specifications:   Memory (EPROM, EEPROM, ROM, NV SRAM)
Part Number Memory Type Memory Size Bus Type Real-Time Clock DIP with Internal Battery PowerCap Package Battery Monitor With GPIO Single Piece Module Supply Voltage (min) (V) Supply Voltage (max) (V) RoHS Available Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
DS1249AB  NV SRAM 256k x 8 Parallel No Yes No No No No 4.75 5.25 Yes MOD/32 707 -40 to +85
0 to +70 		$27.37 @ 1k
DS1249Y  4.5 5.5 $27.37 @ 1k
See All Memory (EPROM, EEPROM, ROM, NV SRAM) (69)
Notes:
**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Application Notes
  		• Application Note 202: NV SRAM Frequently Asked Questions - DS1249AB, DS1249Y
  		• Application Note 1066: Tech. Brief 39: NV SRAM Cross Reference Table - DS1249AB, DS1249Y
  		• Application Note 3759: Timing Considerations When Using NVSRAM - DS1249AB, DS1249Y
  		• Application Note 3840: Next-Generation NV SRAM Technology Products - DS1249AB, DS1249Y
  		• Application Note 4006: NVSRAM Device Programmers - DS1249AB, DS1249Y

    Evaluation Kits
    none

    Design Guides
  		• REAL-TIME CLOCKS (PDF)
  		• NONVOLATILE MEMORY (PDF)

    Reliability Reports
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-20 of 20

    DS1249AB Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1249AB-70#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249AB-100#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249AB-85#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249AB-70IND#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249AB-85IND#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249AB-85  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249AB-70   5% Tolerance, 70ns
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249AB-100   5% Tolerance, 100ns
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249AB-70IND   5% Tolerance, 70ns
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249AB-85IND  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249Y Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1249Y-85#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249Y-70#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249Y-70IND#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249Y-85IND#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249Y-85  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249Y-70   10% Tolerance, 70ns
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249Y-100   10% Tolerance, 100ns
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249Y-100#  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32#7*
    		0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1249Y-70IND   10% Tolerance, 70ns
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1249Y-85IND  
    		MOD;32 pin;707 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDT32-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    More Information
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    2006-09-01
    This page last modified: 2007-06-18




             


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