The AT25128A/256A is a 131,072/262,144-bit serial electrically erasable programmable read-only memory (EEPROM) organized as 16,384/32,768 words of 8 bits each. 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 PDIP, 8-lead EIAJ SOIC, 8-lead JEDEC SOIC, 8-lead TSSOP, 8-ball dBGA2, and 8-lead Ultra Thin SAP packages.
The AT25128A is a 128‑Kb serial EEPROM organized as 16,384 × 8‑bit words. It is offered in low‑voltage (2.7 V to 5.5 V) and standard‑voltage (1.8 V to 5.5 V) versions and comes in several 8‑lead packages, making it suitable for space‑constrained industrial and commercial applications.
The device uses a 3‑wire SPI interface (CS, SI, SO, SCK) and includes write‑protect and HOLD pins for data safety. It supports up to a 20 MHz clock rate, a 5 ms maximum write cycle, 1 million write‑cycle endurance, and operates from –40 °C to +125 °C.
| Maximum SPI clock rate | 20 MHz (5 V) |
|---|---|
| Write cycle time | 5 ms max |
| Endurance | 1 million write cycles |
The device supports up to 20 MHz clock rate when powered at 5 V.
It is offered in 8‑lead PDIP, 8‑lead SOIC, 8‑lead TSSOP, 8‑ball dBGA2, and 8‑lead Ultra Thin SAP packages.
The EEPROM is rated for 1 million write cycles.