DS1249AB:2048k Nonvolatile SRAM

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 of 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
DS1249AB, DS1249Y: Pin Assignment
DS1249AB, DS1249Y: Pin Assignment
DataSheet
titleDownload file
DS1249AB-DS1249Y Data SheetDS1249AB-DS1249Y.pdf
Parametrics
Part NumberMemory TypeMemory SizeBus TypeVSUPPLY
(V)
VSUPPLY
(V)
Package/PinsBudgetary
Price
minmaxSee Notes
DS1249ABNV SRAM256K x 8Parallel4.755.25EDIP/32$33.71 @1k
DS1249Y4.55.5EDIP/32$34.68 @1k
Ordering Information
Part NumberNotesStatusRecommended ReplacementPackageTempRoHS
DS1249AB-1005% Tolerance, 100nsNo Longer AvailableDS1249AB-70#EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249AB-100#No Longer AvailableEDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249AB-705% Tolerance, 70nsNo Longer AvailableDS1249AB-70#EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249AB-70#ActiveEDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249AB-70IND5% Tolerance, 70nsNo Longer AvailableDS1249AB-70IND#EDIP,;32 pin;707.2 mm²-40°C to +85°CSee data sheet
DS1249AB-70IND#ActiveEDIP,;32 pin;707.2 mm²-40°C to +85°CSee data sheet
DS1249AB-85No Longer AvailableDS1249AB-70#EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249AB-85#No Longer AvailableEDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1249AB-85INDNo Longer AvailableDS1249AB-70IND#EDIP,;32 pin;707.2 mm²-40°C to +85°CSee data sheet
DS1249AB-85IND#No Longer AvailableEDIP,;32 pin;707.2 mm²-40°C to +85°CSee data sheet
DS1249AB-DS1249Y.pdf DS1249Y
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
DS1249AB-DS1249Y.pdf DS1249AB