AT24C128/256 provides 131,072/262,144 bits of serial electrically erasable and programmable read only memory (EEPROM)
The AT24C128/256 series are low‑voltage, high‑reliability serial EEPROMs offering 128 Kb or 256 Kb of non‑volatile memory. They support 2‑wire I²C communication, multiple voltage options (1.8 V, 2.7 V, 5 V), and feature hardware and software write protection.
The document provides detailed electrical characteristics, pin‑out diagrams, memory organization, device addressing, write and read procedures, timing diagrams, and packaging information for designers and engineers.
| Endurance | 100,000 write cycles |
|---|---|
| Data Retention | 40 years |
| ESD Protection | > 4000 V |
| Supply Voltage (VCC) | 1.8 V – 5.5 V (varies by version) |
| Supply Current (Read, 5 V, 400 kHz) | 1.0 – 2.0 mA |
| Input Capacitance (SDA) | 8 pF |
The device is rated for 100,000 write cycles.
Each page write can transfer up to 64 bytes.
The device enters low‑power standby mode after power‑up and after a STOP condition.