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> 10X atmel AT49F040-90JC 4MBIT flash memory
10X atmel AT49F040-90JC 4MBIT flash memory
10x Atmel AT49F040-90JC 4Mbit Flash Memory
The AT49F040 is a 5-volt-only in-system Flash Memory. Its 4 megabits of memory is organized as 524,288 words by 8 bits. Manufactured with Atmel s advanced nonvolatile CMOS technology, the device offers access times of 90ns with power dissipation of just 275 mW over the commercial temperature range. When the device is deselected, the CMOS standby current is less than 100 A.
The device contains a user-enabled boot block protection feature. The AT49F040 locates the boot block at lowest order addresses ( bottom boot ).
To allow for simple in-system reprogrammability, the AT49F040 does not require high input voltages for programming. Five-volt-only commands determine the read and programming operation of the device. Reading data out of the device is similar to reading from an EPROM. Reprogramming the AT49F040 is performed by erasing the entire 4 megabits of memory and then programming on a byte-by-byte basis. The byte programming time is a fast 50 s. The end of a program cycle can be optionally detected by the DATA polling feature. Once the end of a byte program cycle has been detected, a new access for a read or program can begin. The typical number of program and erase cycles is in excess of 10,000 cycles.
The optional 16K bytes boot block section includes a reprogramming write lock out feature to provide data integrity. The boot sector is designed to contain user secure code, and when the feature is enabled, the boot sector is permanently protected from being reprogrammed.
* Single 5V supply for all operations
* Internal Program Control and Timer
* 16-Kbyte Boot Block with Lockout
* Fast Erase Cycle Time 10 seconds
* Byte-by-byte Programming 50 s/Byte
* DATA Polling for End of Program Detection
* Typical 10,000 Write Cycles
