STK15C68

The STK15C68 is a fast SRAM 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 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 automatically on restoration of power. Initiation of STORE and RECALL cycles can also be controlled by entering control sequences on the SRAM inputs. The nvSRAM can be used in place of existing 8K x 8 SRAMs and also matches the pinout of 8k x 8 Battery Backed SRAMs, EPROMs, and EEPROMs, allowing direct substitution while enhancing performance. There is no limit on the number of read or write cycles that can be executed and no support circuitry is required for microprocessor interface.