The M25P10-A, M25P20 and M25P40 integrate a standard 4-wire SPI bus with an enhanced data-transfer clock speed of 25MHz. They operate on a 2.7 to 3.6V supply voltage and feature a 1µA deep power-down to minimise overall power consumption. Minimum data retention is 20 years; write endurance is 10,000 cycles by sector. The memories can be programmed at 1 to 256bytes at a time using the «page program» instruction, and can be erased using «bulk erase» or «sector erase». The chips are supplied in the S08 Narrow (150 mils) package, which uses ST's ECOPACK RoHS-compliant lead-free technology. Compatibility between the densities is preserved - including pin-to-pin footprint, software-configuration protocols and power-consumption performance - to enable easy design upgrades to higher densities and provide excellent flexibility in application-board designs.