STK25C48

www.DataSheet4U.com STK25C48 2K x 8 AutoStore™ nvSRAM QuantumTrap™ CMOS Nonvolatile Static RAM Obsolete - Not Recommend for new Designs FEATURES Nonvolatile Storage without Battery Problems Directly Replaces 2K x 8 Static RAM, BatteryBacked RAM or EEPROMs 25ns, 35ns and 45ns Access Times STORE to Nonvolatile Elements Initiated by AutoStore™ on Power Down RECALL to SRAM Initiated by Power Restore 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 24-Pin 600 PDIP Package DESCRIPTION The STK25C48 is a fast SRAM 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 the Nonvolatile Elements. Data transfers from the SRAM to the Nonvolatile Elements (the STORE operation) can take place automatically on power down using charge stored in system capacitance. Transfers from the Nonvolatile Elements to the SRAM (the RECALL operation) take place automatically on restoration of power. The nvSRAM can be used in place of existing 2K x 8 SRAMs and also matches the pinout of 2K x 8 battery-backed SRAMs, EPROMs and EEPROMs, allowing direct substitution while enhancing performance. No support circuitry is required for microprocessor interfacing. BLOCK DIAGRAM QUANTUM TRAP 32 x ...