This is a document about A25L40P series 4 Mbit low voltage serial flash memory. The product has a flash memory capacity of 4 Mbit, flexible sector architecture, support for bulk erase and sector erase functions, and high-speed page programming and SPI bus compatible serial interface. The product operates at a voltage of 2.7V to 3.6V with a maximum clock frequency of 85MHz. In addition, the product also features deep power-down mode and electronic signatures, etc.