STK1743 Datasheet | Simtek

.. STK1743 nv Time™ 8K x 8 Auto Store™ nv SRAM with Real-Time Clock ADVANCE 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 The Simtek STK1743 DIP module houses 64Kb 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 EEPROM at all times. Automatic RECALL on power up transfers the EEPROM data to the SRAM, while an automatic STORE on power down transfers SRAM data to the EEPROM. A software RECALL and STORE are also possible on user mand. nv Time™ allows unlimited accesses to SRAM, unlimited RECALLs and 106 STOREs. BLOCK DIAGRAM EEPROM ARRAY 128 x 512 ROW DECODER VCC STORE/ RECALL CONTROL PIN CONFIGURATIONS NC 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 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 STORE STATIC RAM ARRAY 128 x 512 RECALL POWER CONTROL SOFTWARE DETECT A0 - A12 VCC W NC A8 A9 A11 G A10 E DQ7 DQ6 DQ5 DQ4 DQ3 600 mil Dual In-Line...