AT49F2048

The AT49F2048 is a 5-volt-only, 2 megabit Flash Memory organized as 128K words of 16 bits each. Manufactured with Atmel's advanced nonvolatile CMOS technology, the device offers access times to 70 ns with power dissipation of just 275 mW. When deselected, the CMOS standby current is less than 300 µA.

To allow for simple in-system reprogrammability, the AT49F2048 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; it has standard CE, OE, and WE inputs to avoid bus connection. The AT49F2048 is a 5-voltonly, 2 megabit Flash Memory organized as 128K words contention. Reprogramming the AT49F2048 is performed by first erasing a block of data and then programming on a word-by-word basis.

AT49F2048 is erased by executing the erase command sequence; the device internally controls the erase operation. The memory is divided into three blocks for erase operations. There are two 8K word parameter block sections and one sector consisting of the boot block and the main memory array block. The AT49F2048 is programmed on a word-by-word basis.

AT49F2048 has the capability to protect the data in the boot block; this feature is enabled by a command sequence. Once the boot block programming lockout feature is enabled, the data in the boot block cannot be changed when input levels of 5.5 volts or less are used. The typical number of program and erase cycles is in excess of 10,000 cycles.

The optional 8K word boot block section of AT49F2048 includes a reprogramming 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 protected from being reprogrammed.