AT25128A/256A is a serial electrically-erasable programmable read-only memory (EEPROM) with features such as SPI compatibility, standard-voltage operation, automotive temperature range, and high reliability.
The AT25128A and AT25256A are serial electrically‑erasable programmable read‑only memories (EEPROM) offered in 128 Kbit and 256 Kbit densities. They operate with a standard‑voltage range of 2.7 V to 5.5 V, support SPI modes 0 and 3, and feature a 5 MHz maximum clock rate. The devices include 64‑byte page mode, block write protection, and a self‑timed write cycle of up to 5 ms.
The datasheet details pin configurations for SOIC and TSSOP packages, absolute maximum ratings, DC and AC electrical characteristics, and the full instruction set for read, write, and status operations. Mechanical drawings and revision history are also provided for design reference.
| Supply voltage | 2.7 V to 5.5 V |
|---|---|
| Maximum clock rate | 5 MHz |
| Endurance | 1 Million write cycles |
| Data retention | >100 years |
| Operating temperature range | -40 °C to +125 °C |
| Page mode size | 64 bytes |
The device supports up to a 5 MHz clock rate.
It operates from 2.7 V to 5.5 V.
It is rated for 1 million write cycles.
The device is specified for –40 °C to +125 °C.