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BUY DS1225AD-200 https://www.utsource.net/itm/p/620501.html
64k Nonvolatile SRAM
Description: The DS1225AD-200 is a nonvolatile static RAM (NVSRAM) from Dallas Semiconductor. It is a 32K x 8 bit NVSRAM with a 200 ns access time. Features: 32K x 8 bit NVSRAM 200 ns access time Low power CMOS technology 5V operation TTL compatible inputs and outputs Data retention up to 10 years Low standby current Automatic write protection Available in DIP package Applications: Automotive Instrumentation Industrial control Data acquisition Medical equipment Robotics Security systems (For reference only)