NVRAM NVSRAM Parallel 4M-Bit 3.3V 34-Pin PowerCap Module

The DS1250W 3.3V 4096k Nonvolatile SRAM is a 4,194,304-bit, fully static, nonvolatile SRAM organized as 524,288 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 automatically switched on and write protection is unconditionally enabled to prevent data corruption. DIP-package DS1250W devices can be used in place of existing 512k x 8 static RAMs directly conforming to the popular bytewide 32-pin DIP standard. DS1250W 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.

• 10 years minimum data retention in the absence of external power
• Data is automatically protected during power loss
• Replaces 512k x 8 volatile static RAM, EEPROM or Flash memory
• Unlimited write cycles
• Low-power CMOS
• 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 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 PCM allows easy removal using a regular screwdriver