STK1743

www.DataSheet4U.com STK1743 nvTime™ 8K x 8 AutoStore™ nvSRAM with Real-Time Clock ADVANCE FEATURES Data Integrity of Simtek nvSRAM Combined with Full-Featured Real-Time Clock Stand-Alone Nonvolatile Memory and TimeKeeping Solution—No Other Parts Required No Batteries to Fail Fast 25ns, 35ns and 45ns Access Times Software- and AutoStore™-Controlled Nonvolatile Cycles Year 2000 Compliant with Leap Year Compensation 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 command. nvTime™ 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 A...