This is a datasheet for the M95256-W, M95256-R, M95256-DR and M95256-DF 256-Kbit serial SPI bus EEPROM with high-speed clock. It provides information on the features, specifications, and ordering information for these devices.
The M95256 devices are electrically erasable programmable memories organized as 32768 x 8 bits and accessed through the SPI bus. The datasheet covers the M95256-W with a 2.5 V to 5.5 V supply, the M95256-R and M95256-DR with 1.8 V to 5.5 V, and the M95256-DF with 1.7 V to 5.5 V, over a -40°C to +85°C ambient temperature range.
It documents memory organization, signal descriptions, connection to the SPI bus and SPI modes, operating features, instructions, power-up and delivery state, maximum ratings, DC and AC parameters, package mechanical data and part numbering. The M95256-Dx also offers a 64-byte Identification Page that can be locked in Read-only mode.
| Memory array | 256 Kb (32 Kbytes) of EEPROM |
|---|---|
| Page size | 64 bytes |
| Interface | Serial Peripheral Interface (SPI) bus |
| High-speed clock | 20 MHz |
| Supply voltage (M95256-W) | 2.5 V to 5.5 V |
| Supply voltage (M95256-R, M95256-DR) | 1.8 V to 5.5 V |
| Supply voltage (M95256-DF) | 1.7 V to 5.5 V |
| Operating temperature range | -40°C to +85°C |
| Write cycles | More than 4 million |
| Data retention | More than 200 years |
The M95256 devices are EEPROMs organized as 32768 x 8 bits and provide 256 Kb (32 Kbytes).
The M95256-W can operate with a supply voltage from 2.5 V to 5.5 V.
The high-speed clock is specified as 20 MHz.
The device operates over an ambient temperature range from -40°C up to +85°C.