DESCRIPTION
The Simtek STK20C04 is a fast static RAM with a nonvolatile 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 nonvolatile elements. Data may easily be transferred from the SRAM to the Nonvolatile Elements (the STORE operation), or from the Nonvolatile Elements to the SRAM (the RECALL operation), using the NE pin. Transfers from the Nonvolatile Elements to the SRAM (the RECALL operation) also take place automatically on restoration of power. The STK20C04 combines the high performance and ease of use of a fast SRAM with nonvolatile data integrity.
The STK20C04 features industry-standard pinout for nonvolatile RAMs in a 28-pin 600 mil plastic DIP.

FEATURES
• 25ns, 35ns and 45ns Access Times
• STORE to Nonvolatile Elements Initiated by
   Hardware
• RECALL to SRAM Initiated by Hardware or
   Power Restore
• Automatic STORE Timing
• 10mA Typical ICC at 200ns Cycle Time
• Unlimited READ, WRITE and RECALL Cycles
• 1,000,000 STORE Cycles to Nonvolatile Elements
• 100-Year Data Retention over Full Industrial
   Temperature Range
• Commercial and Industrial Temperatures