ST M25P40 4Mb Flash SPI memory

Features
4 Mbit of Flash Memory
Page Program (up to 256 Bytes) in 1.5ms (typical)
Sector Erase (512 Kbit) in 2 s (typical)
Bulk Erase (4 Mbit) in 5 s (typical)
2.7 V to 3.6 V Single Supply Voltage
SPI Bus Compatible Serial Interface
25 MHz Clock Rate (maximum)
Deep Power-down Mode 1 µA (typical)
Electronic Signature (12h)
More than 100,000 Erase/Program Cycles per Sector
More than 20 Year Data Retention
Narrow SOIC-8
Datasheet