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BUY DS1225AD-150 https://www.utsource.net/itm/p/1241374.html
64k Nonvolatile SRAM
Description: Dallas DS1225AD-150 Nonvolatile SRAM Features: - 512K bits of nonvolatile static RAM - Provides battery-backed RAM storage - Low power CMOS technology - Multiple power supply options permitted - Access time of 150ns - 20-pin DIP package - Operating temperature range of 0 to 70 degrees Celsius Applications: - This device is used in applications where data must be retained in the presence of power loss, such as memory buffers in industrial process controllers, remote sensing systems, programmable logic controllers, and personal computer system upgrades. (For reference only)