DESCRIPTION

The DS1245W 3.3V 1024k Nonvolatile SRAM is a 1,048,576-bit, fully static, nonvolatile SRAM organized as 131,072 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 DS1245W devices can be used in place of existing 128k x 8 static RAMs directly conforming to the popular bytewide 32-pin DIP standard. DS1245W 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.

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 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 PowerCap allows easy removal using a regular screwdriver