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BUY DS14287 https://www.utsource.net/itm/p/360293.html
Real Time Clock with NV RAM Control
Description: The DS14287 is an 8-bit CMOS static RAM organized as 4096 × 8. Features: - Low power CMOS-compatible RAM - 5V supply operation - No external address/data multiplexer required - Fast access time: 250 ns - Maximum cycle time: 500 ns - TTL compatible input/output - Three-state outputs Application: The DS14287 is ideal for applications such as high-speed memory storage, fast look up tables, buffer storage and floppy disk controller. (For reference only)