Data sheet for STMicroelectronics M24256 and M24128 256/128‑Kbit I²C EEPROMs, covering features, pinout, electrical specs and timing.
The M24256 and M24128 are serial I²C EEPROM devices offered in 256‑Kbit (32K×8) and 128‑Kbit (16K×8) configurations. They operate with a two‑wire I²C interface supporting up to 400 kHz and are available in PDIP8, SO8 and SO8‑W packages. The devices include hardware write control, page write up to 64 bytes, and self‑timed programming cycles.
The datasheet provides detailed electrical characteristics, timing diagrams, pin descriptions, and package dimensions. It also lists absolute maximum ratings, write endurance (>100 k cycles), data retention (>40 years), and revision history for the product line.
| Supply Voltage | 4.5 V to 5.5 V (M24xxx) / 2.5 V to 5.5 V (M24xxx‑W) |
|---|---|
| Memory Organization | 32K × 8 bits (M24256) and 16K × 8 bits (M24128) |
| Write Endurance | More than 100,000 erase/write cycles |
| Data Retention | More than 40 years |
| Maximum I²C Clock Frequency | 400 kHz |
The M24256 operates from 4.5 V to 5.5 V; the -W version operates from 2.5 V to 5.5 V.
The device is rated for more than 100,000 erase/write cycles.
It supports a maximum I²C clock frequency of 400 kHz.