The M45PE40 is a 4-Mbit, page-erasable serial flash memory with byte-alterability and a 75 MHz SPI bus interface.
The M45PE40 is a 4‑Mbit (512 Kbit × 8) serial paged flash memory accessed via a high‑speed SPI‑compatible bus. It supports page‑wise write, program and erase operations, with each page 256 bytes wide and organized into 8 sectors of 64 KB each.
Key features include a 75 MHz maximum SPI clock, 2.7 V‑3.6 V supply range, deep‑power‑down mode, over 100 000 write cycles, and more than 20 years data retention. The datasheet details pin functions, timing diagrams, electrical characteristics, package options (ECOPACK®, VFQFPN8, SO8N) and ordering information.
| Memory size | 4 Mbit (512 Kbit × 8) |
|---|---|
| Page size | 256 bytes |
| Number of pages | 2048 pages |
| Sector size | 64 KB |
| Supply voltage | 2.7 V to 3.6 V |
| Maximum SPI clock | 75 MHz |
| Page write time | 11 ms (typical) |
| Page program time | 0.8 ms (typical) |
| Page erase time | 10 ms (typical) |
| Write cycles | >100 000 |
| Data retention | >20 years |
The device operates from a single supply of 2.7 V to 3.6 V.
Each page contains 256 bytes.
The M45PE40 supports up to 75 MHz SPI clock.
It is rated for more than 100 000 write cycles.