STK1744

www.DataSheet4U.com STK1744 nvTime™ 32K x 8 AutoStore™ nvSRAM with Real-Time Clock 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 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 command. nvTime™ allows unlimited READ and WRITE accesses to SRAM, unlimited RECALLs and 106 STOREs. BLOCK DIAGRAM QUANTUM TRAP 512 x 512 VCC ...