STK1700 STK17442 STK17441 STK1744 STK1743 STK16C68 STK16C88 STK25CA8 DS1220 - Datasheet Archive

 

nvTimeTM DESCRIPTION Simtek's family of real time clock products are based on the STK1700 chip set which consists of a very low

 

nvTimeTM nvTimeTM DESCRIPTION Simtek's family of real time clock products are based on the STK1700 STK1700 chip set which consists of a very low power clock chip (STK17442 STK17442) and a parallel interface controller chip (STK17441 STK17441). Together, these devices can easily integrate a capacitor-powered clock into 8 addresses of your memory system. The memory system can consist of nonvolatile SRAM as Simtek has done with its nvTimeTM modules or it can be part of a user-defined memory system. PRODUCT FEATURES s Data integrity of Simtek nvSRAM combined with full-featured real-time clock s Stand-alone nonvolatile memory and timekeeping solution; no other parts required s No batteries or contacts to fail s Not sensitive to undershoot or Vcc rise and fall times s Fast 25ns to 45ns read/write access times s Software and AutoStoreTM controlled nonvolatile cycles s Year 2000 compliant with leap year compensation s 24-hour BCD format s 100 year data retention over full industrial temperature range s Unlimited read and write capability s Full 30-day RTC operation on each power loss s Single 5V ±10% power supply The Simtek nvTimeTM modules contain 256Kb (STK1744 STK1744) or 64Kb (STK1743 STK1743) 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. nvTimeTM allows unlimited READ and WRITE access to SRAM, unlimited RECALLs and 106 STOREs. The nvTimeTM modules are available in a 28 pin 600-mil package, or in their component form for surface mount applications. Additional package options are expected in the future. SIMTEK nvTimeTM PRODUCT FAMILY Device Type Nonvolatile Store Pins Package Part Number 8K x 8 nvSRAM + Clock AutoStoreTM 28 600-mil DIP STK1743 STK1743 32K x 8 nvSRAM + Clock AutoStoreTM 28 600-mil DIP STK1744 STK1744 Clock + Memory Controller User may choose Simtek nvSRAM or integrate into any memory system STK17441 STK17441 + STK17442 STK17442 chip set STK1700 STK1700 Memory Controller 48 LQFP STK17441 STK17441 Real Time Clock 24 SOIC STK17442 STK17442 nvTimeTM nvTimeTM LOGIC BLOCK DIAGRAM VCC EEPROM ARRAY 512 x 512 A5 STORE ROW DECODER A6 A7 A8 A9 A11 A12 STATIC RAM ARRAY 512 x 512 STORE/ RECALL CONTROL POWER CONTROL RECALL SOFTWARE DETECT A0 - A13 A13 A14 DQ0 RTC COLUMN I/O INPUT BUFFERS DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 COLUMN DECODER MUX A0 - A14 A0 A1 A2 A3 A4 A10 G DQ7 E W CROSS REFERENCE GUIDE - nvSRAM AND nvTimeTM BATTERY-BACKED SRAM, NOVRAM AND RTC Competitor PN Simtek Replacement* PN Simtek Replacement* PN Simtek Replacement* Benchmark bq4010 bq4830 STK16C68 STK16C68 STK1744 STK1744 bq4011 STK16C88 STK16C88 bq4013 STK25CA8 STK25CA8 Dallas DS1220 DS1220 DS1243 DS1243 DS1643 DS1643 DS1744 DS1744 STK25C48 STK25C48 STK1743 STK1743 STK1743 STK1743 STK1744 STK1744 DS1225 DS1225 DS1244 DS1244 DS1644 DS1644 STK16C68 STK16C68 STK1744 STK1744 STK1744 STK1744 DS1230 DS1230 DS1245 DS1245 DS1743 DS1743 STK16C88 STK16C88 STK25CA8 STK25CA8 STK1743 STK1743 STMicro M48T08 M48T08 M48T58 M48T58 M48Z18 M48Z18 M48Z35 M48Z35 STK1743 STK1743 STK1743 STK1743 STK16C68 STK16C68 STK16C88 STK16C88 M48T18 M48T18 M48Z02 M48Z02 M48Z30 M48Z30 STK1744 STK1744 STK25C48 STK25C48 STK16C88 STK16C88 M48T35 M48T35 M48Z08 M48Z08 M48Z32 M48Z32 STK1744 STK1744 STK16C68 STK16C68 STK16C88 STK16C88 Xicor X20C04 X20C04 STK20C04 STK20C04 X20C16 X20C16 STK10C48 STK10C48 X20C17 X20C17 STK25C48 STK25C48 INDUSTRY-STANDARD SRAM/EPROM/EEPROM SRAM Simtek Replacement* EPROM Simtek Replacement* Parallel EEPROM Simtek Replacement* 8K x 8 32K x 8 128K x 8 STK11C68 STK11C68 or STK15C68 STK15C68 STK11C88 STK11C88 or STK15C88 STK15C88 STK25CA8 STK25CA8 8K x 8 32K x 8 STK11C68 STK11C68 STK11C88 STK11C88 2K x 8 8K x 8 32K x 8 128K x 8 STK25C48 STK25C48 STK15C68 STK15C68 or STK16C68 STK16C68 STK15C88 STK15C88 or STK16C88 STK16C88 STK25CA8 STK25CA8 * Additional nvSRAM's available with extended functionality Simtek Corporation 1465 Kelly Johnson Boulevard Colorado Springs, CO 80920, USA 800-637-1667 719-531-9444 Fax 719-531-9481 info@simtek.com www.simtek.com Simtek Corporation Park House 10 Park Street, Suite 404 Bristol BS1 5HX, England (44) (117) 949-7762 Fax (44) (117) 949-7764 free samples at www.simtek.com/samples.html