STK25C48 Datasheet | Simtek

.. 2K x 8 Auto Store™ nv SRAM Quantum Trap™ CMOS Nonvolatile Static RAM Obsolete - Not Remend for new Designs Features - Nonvolatile Storage without Battery Problems - Directly Replaces 2K x 8 Static RAM, Battery Backed RAM or EEPROMs - 25ns, 35ns and 45ns Access Times - STORE to Nonvolatile Elements Initiated by Auto Store™ on Power Down - RECALL to SRAM Initiated by Power Restore - 10m A 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 - mercial 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 nv SRAM 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 512 ROW DECODER VCC STORE/ RECALL CONTROL PIN CONFIGURATIONS 1 2 24 23 22 21 20 19 18 17 16 15 14 13 A5 A6 A7 A8 A9 STORE STATIC RAM ARRAY 32 x 512 RECALL POWER CONTROL A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ 3 4 5 6 7 8 9 10 11 12 VCC A8 A9 W G A10 E DQ7 DQ6 DQ5 DQ4 DQ3 24 - 600 PDIP DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6...