Part Number : 25P40
Function : 3V, 4Mb Serial Flash Embedded Memory
Package : SOIC 8 Pin Type
Maker : Micron Technology
Pinouts : 
Description :
The 25P40, M25P40 is an 4Mb (512Kb x 8) serial Flash memory device with advanced write protection mechanisms accessed by a high-speed SPI-compatible bus. The device supports high-performance commands for clock frequency up to 75MHz.
The memory can be programmed 1 to 256 bytes at a time using the PAGE PROGRAM command. It is organized as 8 sectors, each containing 256 pages. Each page is 256 bytes wide.
The entire memory can be erased using the BULK ERASE command, or it can be erased one sector at a time using the SECTOR ERASE command.
Features
1. 4 Mbit of Flash memory
2. 2.3 V to 3.6 V single supply voltage
3. SPI bus compatible serial interface
4. 50 MHz clock rate (maximum)
5. Page Program (up to 256 bytes) in 1.5 ms (typical)
6. Sector Erase (512 Kbit) in 1 s (typical)
7. Bulk Erase (4 Mbit) in 4.5 s (typical)
Datasheet PDF Download : 
Others datasheet of same file : M25P40, M25P40-VMN6PBA
