STK1744 Datasheet | Simtek

.. STK1744 nv Time™ 32K x 8 Auto Store™ nv SRAM with Real-Time Clock Features - Data Integrity of Simtek nv SRAM bined with Full-Featured Real-Time Clock - Stand-Alone Nonvolatile Memory and Time Keeping Solution- No Other Parts Required - No Batteries to Fail - Fast 25ns, 35ns and 45ns Access Times - Software- and Auto Store™-Controlled Nonvolatile Cycles - Year 2000 pliant with Leap Year pensation - 24-Hour BCD Format - 100-Year Data Retention over Full Industrial Temperature Range - Full 30-Day RTC Operation on Each Power Loss - Single 5V ± 10% Power Supply DESCRIPTION PRELIMINARY The Simtek STK1744 DIP module houses 256Kb of nonvolatile static RAM, a real-time clock (RTC) with crystal and a high-value capacitor to support systems that require high reliability and ease of manufacturing. READ and WRITE access to all RTC functions and the memory is the same as a conventional x 8 SRAM. The highest eight addresses of the RAM support clock registers for centuries, years, months, dates, days, hours, minutes and seconds. Independent data resides in the integral Nonvolatile Elements at all times. Automatic RECALL on power up transfers the Nonvolatile Elements data to the SRAM, while an automatic STORE on power down transfers SRAM data to the Nonvolatile Elements. A software RECALL and STORE are also possible on user mand. nv Time™ allows unlimited READ and WRITE accesses to SRAM, unlimited RECALLs and 106 STOREs. BLOCK DIAGRAM QUANTUM TRAP 512 x 512 VCC STORE/ RECALL CONTROL PIN CONFIGURATIONS 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 28 27 26 25 24 23 22 21 20 19 18 17 16 15 A5 A6 A7 A8 A9 A11 A12 A13 A14 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 ROW DECODER STORE STATIC RAM ARRAY 512 x 512 RECALL POWER CONTROL SOFTWARE DETECT A0 - A13 VCC W A13 A8 A9 A11 G A10 E DQ7 DQ6 DQ5 DQ4 DQ3 - 600 DIP Module (See application note for surface...