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The AT28HC256 is a high-performance electrically erasable and programmable readonly memory.
28HC256 Features
* Fast Read Access Time
* 70 ns
* Automatic Page Write Operation
* Internal Address and Data Latches for 64 Bytes
* Internal Control Timer
* Fast Write Cycle Times
* Page Write Cycle Time: 3 ms or 10 ms Maximum
* 1 to 64-byte Page Write