DESCRIPTION
The Simtek STK12C68-M is a fast static RAM (40, 45 and 55ns), with a nonvolatile EEPROM element incorporated in each static memory cell. The SRAM can be read and written an unlimited number of times, while independent nonvolatile data resides in EEPROM. Data transfers from the SRAM to the EEPROM (the STOREoperation) take place automatically upon power down using charge stored in an external 100 µF capacitor. Transfers from the EEPROM to the SRAM (the RECALL operation) take place automatically on power up. Software sequences may also be used to initiate both STORE and RECALL operations. A STORE can also be initiated via a single pin.
The STK12C68-M is available in the following packages: a 28-pin 300 mil ceramic DIP and 28-pad LCC.

FEATURES
• 40, 45 and 55ns Access Times
• 15 mA ICC at 200ns Access Speed
• Automatic STORE to EEPROM on Power Down
• Hardware or Software initiated STORE to EEPROM
• Automatic STORE Timing
• 100,000 STORE cycles to EEPROM
• 10 year data retention in EEPROM
• Automatic RECALL on Power Up
• Software initiated RECALL from EEPROM
• Unlimited RECALL cycles from EEPROM
• Single 5V±10% Operation
• Available in multiple standard packages