DS1249W:3.3V 2048kb Nonvolatile SRAM

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 VCC for an out-of-tolerance condition. When such a condition occurs, the 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 that 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 of 100ns
  • Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
  • Optional industrial (IND) temperature range of -40°C to +85°C
  • JEDEC standard 32-pin DIP package
DS1249W: Pin Assignment
DS1249W: Pin Assignment
  • Automated Test Equipment (ATE)
  • Automatic Utility Meter Reading
  • Building Energy Management (HVAC)
  • Cable Modems
  • Computers: Desktop, Workstation, Server
  • Digital Television (Receivers, Set-Top Boxes)
  • Modems (Analog, ISDN, DSL)
  • Network Hubs, Switches, Routers
  • Notebook Computers
  • Oscilloscopes
  • Printers and Faxes
  • Programmable Logic Controllers
  • Storage Systems
  • Test and Measurement Equipment
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DS1249W Data SheetDS1249W.pdf
Part NumberMemory TypeMemory SizeBus TypeVSUPPLY
minmaxSee Notes
DS1249WNV SRAM256K x 8Parallel33.6EDIP/32$30.65 @1k
Quality and Environmental Data
Related Products
Ordering Information
Part NumberNotesStatusRecommended ReplacementPackageTempRoHS
DS1249W-1003.3V, 100nsNo Longer AvailableDS1249W-100#EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249W-100#ActiveEDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249W-100IND3.3V, 100nsNo Longer AvailableDS1249W-100IND#EDIP,;32 pin;707.2 mm²-40°C to +85°CSee data sheet
DS1249W-100IND#No Longer AvailableEDIP,;32 pin;707.2 mm²-40°C to +85°CSee data sheet
DS1249W-1503.3V, 150nsNo Longer AvailableDS1249W-100#EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249W-150#No Longer AvailableDS1249W-100#EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249W.pdf DS1249W
DS1249W.pdf DS1249W
DS1249W.pdf DS1249W
Low-Temperature Data Retention in Nonvolatile SRAM DS1270Y
NV SRAM Device Programmers DS1250Y
Timing Considerations When Using NVSRAM DS1350Y
Tech. Brief 39: NV SRAM Cross Reference Table DS1270Y
NV SRAM Frequently Asked Questions DS1350Y
DS1249W.pdf DS1249W
DS1249W.pdf DS1249W