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BUY DS1220AB-150 https://www.utsource.net/itm/p/620499.html
NVRAM ( Battery Based
Description: The DS1220AB-150 is a nonvolatile static RAM (NVRAM) from Dallas Semiconductor. Features: - 8K x 8 bit organization - 150ns access time - Low power CMOS technology - Auto-write capability - Low power standby mode - TTL compatible inputs and outputs - Single +5V supply Applications: - Automotive systems - Industrial control systems - Networking systems - Medical instrumentation - Data acquisition systems - Embedded controllers (For reference only)