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BUY AT29C040A-90JU https://www.utsource.net/itm/p/1870053.html
4-megabit (512K x 8) 5-volt Only 256-byte Sector Flash Memory
Description: The AT29C040A is a 4 Mbit (512K x 8) CMOS Electrically Erasable Programmable Read Only Memory (EEPROM). Features: Low power CMOS technology Single 5V ± 10% power supply Access times of 90ns Byte-wide data output Low power consumption Self-timed write cycle Hardware and software data protection Endurance: 100,000 write cycles Data retention: 100 years Packages: PLCC-32 Applications: The AT29C040A is ideally suited for applications such as: Automotive systems Industrial control systems Data acquisition systems Medical instrumentation Security systems Networking systems Telecommunications systems (For reference only)