AT29C256 256k 120ns CMOS Flash Memory

The 29C256 is a five-volt-only in-system Flash programmable and erasable read-only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits. The device offers access times to 70 ns with a power dissipation of just 275 mW. When the device is deselected, the CMOS standby current is less than 300 µA. The device endurance is such that any sector can typically be written to in excess of 10,000 times.

To allow for simple in-system re-programmability, the 29C256 does not require high input voltages for programming. Five-volt-only commands determine the operation of the device. Reading data out of the device is similar to reading from a static RAM. Reprogramming the 29C256 is performed on a page basis; 64 bytes of data are loaded into the device and then simultaneously programmed.