DS1345W

10 years minimum data retention in the absence of external power
 Data is automatically protected during power loss
 Power supply monitor resets processor when V_CC power loss occurs and holds processor in reset during V_CC ramp-up
 Battery monitor checks remaining capacity daily
 Read and write access times as fast as 100 ns
 Unlimited write cycle endurance
 Typical standby current 50 A
 Upgrade for 128k x 8 SRAM, EEPROM or Flash
 Lithium battery 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
 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

Voltage On Any Pin Relative To Ground                                                   -0.3V to +4.6V
Operating Temperature                          0°C to 70°C, -40°C to +85°C for IND parts
Storage Temperature                        -40°C to +70°C, -40°C to +85°C for IND parts
Soldering Temperature                                                                260°C for 10 seconds

This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

The DS1345W 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 V_CC 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. Additionally, the DS1345W has dedicated circuitry for monitoring the status of V_CC and the status of the internal lithium battery. DS1345W 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. The devices can be used in place of 128k x 8 SRAM, EEPROM or Flash components.