GENERAL DESCRIPTION
The A25L40P is a 4 Mbit (512K x 8) Serial Flash Memory, with advanced write protection mechanisms, accessed by a high speed SPI-compatible bus.
The memory can be programmed 1 to 256 bytes at a time, using the Page Program instruction.
The memory is organized as 8 sectors, each containing 256 pages. Each page is 256 bytes wide. Thus, the whole memory can be viewed as consisting of 2048 pages, or 524,288 bytes. The whole memory can be erased using the Bulk Erase instruction, or a sector at a time, using the Sector Erase instruction.

FEATURES
■ 4 Mbit of Flash Memory
■ Flexible Sector Architecture (4/4/8/16/32)KB/64x7 KB
■ Bulk Erase (4 Mbit) in 6s (typical)
■ Sector Erase (512 Kbit) in 1s (typical)
■ Page Program (up to 256 Bytes) in 3ms (typical)
■ 2.7 to 3.6V Single Supply Voltage
■ SPI Bus Compatible Serial Interface
■ 85MHz Clock Rate (maximum)
■ Deep Power-down Mode 1µA (typical)
■ Top or Bottom boot block configuration available
■ Electronic Signatures
    - JEDEC Standard two-Byte Signature (2013h)
    - RES Instruction, One-Byte, Signature (12h), for backward compatibility
■ Package options
    - 8-pin SOP (150mil or 209mil), 16-pin SOP, 8-pin DIP (300mil) or 8-pin QFN
    - All Pb-free (Lead-free) products are RoHS compliant