256-Kbit serial I²C bus EEPROM Datasheet − production data
The M24256 is a 256-Kbit (32 K x 8 bits) EEPROM compatible with I2C bus modes at 1 MHz, 400 kHz, and 100 kHz. It features a single supply voltage range from 1.7 V to 5.5 V depending on the specific device grade (BW, BR, BF, DR, DF). The device supports random and sequential read modes, byte and page write operations, and includes an optional Identification Page for M24256-D variants that can be permanently locked.
The document provides detailed signal descriptions for SCL, SDA, Chip Enable (E2, E1, E0), and Write Control (WC). It outlines memory organization, device operation sequences including start/stop conditions, and specific instructions for write and read operations. The datasheet also lists maximum ratings, DC and AC electrical parameters, and mechanical data for various package types including TSSOP8, SO8, UFDFPN8, and WLCSP.
| Memory Capacity | 256 Kbit (32 Kbytes) |
|---|---|
| Page Size | 64 bytes |
| Clock Frequency | 1 MHz |
| Supply Voltage (BF/DF) | 1.7 V to 5.5 V |
| Write Cycles | More than 4 million |
| Data Retention | More than 200 years |
The M24256 is organized as 32 K x 8 bits.
Yes, the Identification Page can be permanently locked in Read-only mode.
Byte Write takes within 5 ms and Page Write takes within 5 ms.