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BUY DS1225AB-200 https://www.utsource.net/itm/p/222523.html
64k Nonvolatile SRAM
Description: The DS1225AB-200 is a nonvolatile static RAM (NVRAM) manufactured by Dallas Semiconductor. It is a 28-pin DIP (Dual Inline Package) chip. Features: - 8K x 8 nonvolatile static RAM - Low power CMOS technology - Fully static operation - Automatic power-fail detect and write-protect - Data retention > 10 years - Access time: 200ns - Single +5V power supply Applications: - Automotive systems - Industrial control - Instrumentation - Security systems - Data logging - Battery-backed RAM (For reference only)