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BUY DS1245AB-100+ https://www.utsource.net/itm/p/4399071.html
IC NVSRAM 1M PARALLEL 32EDIP
Description: The DS1245AB-100+ is a nonvolatile static RAM (NVSRAM) from Dallas Semiconductor. It is a 256K x 8 bit NVSRAM with a battery backup feature. Features: 256K x 8 bit NVSRAM Battery backup feature Low power CMOS technology Fast access time Single 5V power supply Data retention up to 10 years Industrial temperature range Available in DIP package Applications: Automotive Industrial control Medical instrumentation Data acquisition Portable instrumentation Security systems Robotics (For reference only)