STK25CA8

www.DataSheet4U.com STK25CA8 128K x 8 AutoStore™ nvSRAM QuantumTrap™ CMOS Nonvolatile Static RAM Module FEATURES Nonvolatile Storage without Battery Problems Directly Replaces 128K x 8 Static RAM, BatteryBacked RAM or EEPROM 35ns and 45ns Access Times STORE to EEPROM Initiated by AutoStore™ on Power Down RECALL to SRAM on Power Restore 22mA ICC at 200ns Cycle Time Unlimited READ, WRITE and RECALL Cycles 1,000,000 STORE Cycles to EEPROM 100-Year Data Retention Over Full Commercial Temperature Range Commercial and Industrial Temperatures 32-Pin 600 mil Dual In-Line Module DESCRIPTION The Simtek STK25CA8 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 the 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 automatically on restoration of power. BLOCK DIAGRAM A15 A16 A5 A6 A7 A8 A9 A11 A12 A13 A14 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 MODULE DECODER EEPROM ARRAY 512 x 512 STORE STATIC RAM ARRAY 512 x 512 RECALL PIN CONFIGURATIONS NC A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 VCC STORE/ RECALL CONTROL POWER CONTRO...