DESCRIPTION
The Simtek STK15C88 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 using charge stored in system capacitance. Transfers from the EEPROM to the SRAM (the RECALL operation) take place auto matically on restoration of power. Initiation of STORE and RECALL cycles can also be controlled by entering control sequences on the SRAM inputs.

FEATURES
• Nonvolatile Storage Without Battery Problems
• Directly Replaces 32K x 8 static RAM, Battery Backed RAM or EEPROM
• 25ns, 35ns and 45ns Access Times
• Store to EEPROM Initiated by Software or AutoStore™ on Power Down
• Recall to SRAM by Software or Power Restore
• 15mA ICC at 200ns Cycle Time
• Unlimited Read, Write and Recall Cycles
• 1,000,000 Store Cycles to EEPROM
• 100 Year Data Retention Over Full Industrial Temperature Range
• Commercial and Industrial Temp. Ranges
• 28 Pin 600 or 300 mil PDIP and 350 mil SOIC