Overview
The LE25FU406B is a serial interface-compatible flash memory device with a 512K × 8-bit configuration. It uses a single 2.5V power supply for both reading and writing (program and erase functions) and does not require a special power supply. As such, it can support on-board programming. It has three erase functions, each of which corresponds to the size of the memory area in which the data is to be erased at one time: the small sector (4K bytes) erase function, the sector (64K bytes) erase function, and the chip erase function (for erasing all the data together). The memory space can be efficiently utilized by selecting one of these functions depending on the application. A page program method is supported for data writing. 

FEATUREs
• Read/write operations enabled by single 2.5V power supply: 2.30 to 3.60V supply voltage range
• Operating frequency : 30MHz
                                      50MHz (at the planning stage)
• Temperature range : 0 to 70°C
                                 –40 to +85°C (at the planning stage)
• Serial interface : SPI mode 0, mode 3 supported
• Sector size : 4K bytes/small sector, 64K bytes/sector
• Small sector erase, sector erase, chip erase functions
• Page program function (256 bytes/page)
• Block protect function
• Highly reliable read/write
   Number of rewrite times : 100,000 times
   Small sector erase time : 40ms (typ.), 150ms (max.)
   Sector erase time : 80ms (typ.), 250ms (max.)
   Chip erase time : 200ms (typ.), 2.0s (max.)
   Page program time : 2.0ms/256 bytes (typ.), 2.5ms/256 bytes (max.)
• Status functions
   Ready/busy information, protect information
• Data retention period : 20 years
• Package : LE25FU406BTT MSOP8 (225mil)
                 : LE25FU406BMA MFP8 (225mil)
                 : LE25FU406BFN VSON8