DESCRIPTION
The Simtek STK12C68 is a fast static RAM with a nonvolatile, electrically erasable PROM 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 STORE operation) can take place automatically on power down.

FEATURES
• 20ns, 25ns, 35ns and 45ns Access Times
• “Hands-off” Automatic STORE with External
   68µF Capacitor on Power Down
• STORE to EEPROM Initiated by Hardware,
   Software or AutoStore™ on Power Down
• RECALL to SRAM Initiated by Software or
   Power Restore
• 10mA Typical ICC at 200ns Cycle Time
• Unlimited READ, WRITE and RECALL Cycles
• 1,000,000 STORE Cycles to EEPROM
• 100-Year Data Retention in EEPROM
• Single 5V + 10% Operation
• Not Sensitive to Power On/Off Ramp Rates
• No Data Loss from Undershoot
• Commercial and Industrial Temperatures
• 28-Pin SOIC and DIP Packages