DS1245AB:1024k Nonvolatile SRAM

The DS1245 1024k Nonvolatile (NV) SRAMs are 1,048,576-bit, fully static, nonvolatile SRAMs organized as 131,072 words by 8 bits. Each complete 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 automatically switched on and write protection is nconditionally enabled to prevent data corruption. DIP-package DS1245 devices can be used in place of existing 128k x 8 static RAMs directly conforming to the popular bytewide 32-pin DIP standard. DS1245 devices in the PowerCap Module package are directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete Nonvolatile SRAM module. 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
  • Replaces 128k x 8 volatile static RAM, EEPROM or Flash memory
  • Unlimited write cycles
  • Low-power CMOS
  • 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 (DS1245Y)
  • Optional ±5% VCC operating range (DS1245AB)
  • Optional industrial temperature range of -40°C to +85°C, designated IND
  • JEDEC standard 32-pin DIP package
  • PowerCap Module (PCM) package
    • Directly surface-mountable module
    • Replaceable snap-on PowerCap provides lithium backup battery
    • Standardized pinout for all nonvolatile SRAM products
    • Detachment feature on PowerCap allows easy removal using a regular screwdriver
DS1245AB, DS1245Y: Pin Assignment
DS1245AB, DS1245Y: Pin Assignment
DataSheet
titleDownload file
DS1245AB-DS1245Y Data SheetDS1245AB-DS1245Y.pdf
Parametrics
Part NumberMemory TypeMemory SizeBus TypeVSUPPLY
(V)
VSUPPLY
(V)
Package/PinsBudgetary
Price
minmaxSee Notes
DS1245ABNV SRAM128K x 8Parallel4.755.25EDIP/32
PCAP/34
$19.03 @1k
DS1245Y4.55.5EDIP/32
PCAP/34
$19.78 @1k
Ordering Information
Part NumberNotesStatusRecommended ReplacementPackageTempRoHS
DS1245AB-1005% Tolerance, 100nsNo Longer AvailableDS1245AB-70+EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1245AB-100+ActiveEDIP,;32 pin;707.2 mm²0°C to +70°CLead Free
DS1245AB-1205% Tolerance, 120nsNo Longer AvailableDS1245AB-70+EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1245AB-120+ActiveEDIP,;32 pin;707.2 mm²0°C to +70°CLead Free
DS1245AB-120IND5% Tolerance, 120nsNo Longer AvailableDS1245AB-70IND+EDIP,;32 pin;707.2 mm²-40°C to +85°CSee data sheet
DS1245AB-120IND+ActiveEDIP,;32 pin;707.2 mm²-40°C to +85°CLead Free
DS1245AB-705% Tolerance, 70nsNo Longer AvailableDS1245AB-70+EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1245AB-70+ActiveEDIP,;32 pin;707.2 mm²0°C to +70°CLead Free
DS1245AB-70IND5% Tolerance, 70nsNo Longer AvailableDS1245AB-70IND+EDIP,;32 pin;707.2 mm²-40°C to +85°CSee data sheet
DS1245AB-70IND+ActiveEDIP,;32 pin;707.2 mm²-40°C to +85°CLead Free
Part NumberNotesStatusRecommended ReplacementPackageTempRoHS
DS1245AB-855% Tolerance, 85nsNo Longer AvailableDS1245AB-70+EDIP,;32 pin;707.2 mm²0°C to +70°CSee data sheet
DS1245AB-85+ActiveEDIP,;32 pin;707.2 mm²0°C to +70°CLead Free
DS1245ABP-1005% Tolerance, 100nsNo Longer AvailableDS1245ABP-70+PCAP,;34 pin;596.9 mm²0°C to +70°CSee data sheet
DS1245ABP-100+ActivePCAP,;34 pin;596.9 mm²0°C to +70°CLead Free
DS1245ABP-705% Tolerance, 70nsNo Longer AvailableDS1245ABP-70+PCAP,;34 pin;596.9 mm²0°C to +70°CSee data sheet
DS1245ABP-70+ActivePCAP,;34 pin;596.9 mm²0°C to +70°CLead Free
DS1245ABP-70IND5% Tolerance, 70nsNo Longer AvailableDS1245ABP-70IND+PCAP,;34 pin;596.9 mm²-40°C to +85°CSee data sheet
DS1245ABP-70IND+ActivePCAP,;34 pin;596.9 mm²-40°C to +85°CLead Free
DS1245AB-DS1245Y.pdf DS1245Y
How to Replace a DS1213 SmartSocket with an Equivalent-Density NV SRAM Module DS1250AB
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
DS1245AB-DS1245Y.pdf DS1245AB