The AT24C256C is a product that provides 262,144 bits of serial electrically erasable and programmable read-only memory (EEPROM) organized as 32,768 words of 8 bits each. The device's cascadable feature allows up to eight devices to share a common two-wire bus. The product is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The devices are available in various package options. Additionally, the entire family is available in a 1.8V version.
The AT24C256C is a 256‑kilobit serial EEPROM organized as 32,768 × 8‑bit words. It supports low‑voltage (1.8 V) and standard‑voltage (up to 5.5 V) operation, 64‑byte page writes, and a write‑protect pin for data protection. The device can be cascaded with up to eight identical parts on a common two‑wire bus.
The manual details pin functions, memory organization, absolute maximum ratings, timing diagrams, and standby mode behavior. Electrical specifications such as supply current, standby current, endurance, and data retention are provided for designers.
| Operating Voltage | 1.8 V to 5.5 V |
|---|---|
| Supply Voltage (Voct) | 1.8 V to 5.5 V |
| Read Supply Current (400 kHz) | 1.0 mA – 2.0 mA |
| Write Supply Current (400 kHz) | 2.0 mA – 3.0 mA |
| Standby Current | 1.0 nA |
| Endurance | 1 000 000 write cycles |
| Data Retention | 40 years |
| Page Size | 64 bytes |
| Number of Pages | 512 |
The device operates from 1.8 V up to 5.5 V.
It is rated for one million write cycles.
The standby current is 1.0 nA.
Writes are performed in 64‑byte pages.