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BUY M29F400BT70N1 https://www.utsource.net/itm/p/127548.html
4 Mbit 512Kb x8 or 256Kb x16, Boot Block Single Supply Flash Memory
Description: 4Mb (512K x 8) Flash Memory Features: - Low voltage operation: 2.7V to 3.6V - Fast access time: 70ns - Byte/word/page programming - Uniform sector architecture - Embedded algorithm - Data# polling and toggle bits - Automatic address and data multiplexing - Software and hardware data protection - JEDEC standard pinout - 100,000 erase/program cycles - 10 year data retention - Package: SOP-48 Applications: - Automotive - Industrial - Consumer - Computing - Networking - Telecommunications (For reference only)