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STK1743-D25I Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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STK1743-D25I Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
1 / 10 page March 1999 7-1 STK1743 nvTime™ 8K 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 Time- Keeping 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 sys- tems that require high reliability and ease of manu- facturing. READ and WRITE access to all RTC functions and the memory is the same as a conven- tional 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 unlim- ited accesses to SRAM, unlimited RECALLs and 106 STORE s. BLOCK DIAGRAM EEPROM ARRAY 128 x 512 STORE RECALL COLUMN I/O COLUMN DEC STATIC RAM ARRAY 128 x 512 STORE/ RECALL CONTROL POWER CONTROL A6 A7 A11 A12 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 SOFTWARE DETECT VCC A0 - A12 G E W A9 A8 A10 A3 A2 A0 A1 A4 A5 RTC MUX A0 - A12 PIN CONFIGURATIONS NC A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS VCC NC A8 A9 A11 G W 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 A10 E DQ7 DQ6 DQ5 DQ4 DQ3 600 mil Dual In-Line Module PIN NAMES A0 - A12 Address Inputs W Write Enable DQ0 - DQ7 Data In/Out E Chip Enable G Output Enable VCC Power (+ 5V) VSS Ground ADVANCE |
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