SUMMARY DESCRIPTION
The M45PE40 is a 4Mbit (512K x 8 bit) Serial Paged Flash Memory accessed by a high speed SPI-compatible bus.
The memory can be written or programmed 1 to 256 bytes at a time, using the Page Write or Page Program instruction. The Page Write instruction consists of an integrated Page Erase cycle followed by a Page Program cycle.
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 524288 bytes.
The memory can be erased a page at a time, using the Page Erase instruction, or a sector at a time, using the Sector Erase instruction.

FEATURES SUMMARY
■ 4Mbit of Page-Erasable Flash Memory
■ Page Write (up to 256 Bytes) in 11ms (typical)
■ Page Program (up to 256 Bytes) in 1.2ms (typical)
■ Page Erase (256 Bytes) in 10ms (typical)
■ Sector Erase (512 Kbit)
■ 2.7 to 3.6V Single Supply Voltage
■ SPI Bus Compatible Serial Interface
■ 33MHz Clock Rate (maximum)
■ Deep Power-down Mode 1µA (typical)
■ Electronic Signature
    – JEDEC Standard Two-Byte Signature (4013h)
■ More than 100000 Write Cycles
■ More than 20 Year Data Retention
■ Packages
    – ECOPACK® (RoHS compliant)