The AT24C256B is a 256K (32,768 x 8) serial EEPROM that features low voltage and low power consumption. The device has a cascadable feature that allows up to eight devices to share a common two-wire bus. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The devices are available in space-saving 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead MAP, 8-lead Ultra Thin SAP, 8-lead TSSOP, and 8-ball dBGA2 packages. In addition, the entire family is available in a 1.8V (1.8V to 3.6V) version.
The AT24C256B is a 256‑Kbit (262,144‑bit) two‑wire serial EEPROM offered in multiple 8‑lead packages such as JEDEC PDIP, SOIC, Ultra Thin SAP, TSSOP and dBGA2. It supports low‑voltage operation from 1.8 V to 3.6 V, features a write‑protect pin, and provides up to one million write cycles with a 40‑year data retention.
The device includes a standard two‑wire I²C‑compatible interface with configurable address pins allowing up to eight devices on a single bus. Electrical characteristics include a supply current of 1‑2 mA for read operations and 2‑3 mA for writes at 400 kHz, and a maximum write cycle time of 5 ms. Operating temperature ranges from –40 °C to +125 °C (storage up to +150 °C).
| Memory size | 262,144 bits (256 Kbit) |
|---|---|
| Voltage range | 1.8 V to 3.6 V |
| Endurance | 1 000 000 write cycles |
| Data retention | 40 years |
| Operating temperature | –40 °C to +125 °C |
| Package types | 8‑lead JEDEC PDIP, 8‑lead JEDEC SOIC, Ultra Thin SAP, TSSOP, dBGA2 |
It operates from 1.8 V up to 3.6 V.
The device is rated for one million write cycles.