The AT25080A/160A/320A/640A is a serial electrically-erasable programmable read-only memory (EEPROM) from Microchip, offering 8192/16384/32768/65536 bits of storage space, and is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential.
The AT25080A, AT25160A, AT25320A, and AT25640A are serial electrically‑erasable programmable read‑only memory (EEPROM) devices offered by Atmel. They are available in 8‑lead SOIC and TSSOP packages and are optimized for automotive and low‑power applications.
Key features include SPI compatibility, 5 MHz clock rate, 32‑byte page mode, block write protection, and a self‑timed write cycle. The datasheet details absolute maximum ratings, DC and AC characteristics, pin functions, and the instruction set required for interfacing with microcontrollers.
| Supply Voltage (VCC) | 2.7 V – 5.5 V |
|---|---|
| Clock Rate | 5.0 MHz |
| Page Mode | 32‑byte |
| Endurance | 1 million write cycles |
| Data Retention | 100 years |
| Supply Current (typical, 5 MHz) | 6.0 mA |
| Package Types | 8‑lead SOIC, 8‑lead TSSOP, 8‑lead PDIP |
The devices operate from 2.7 V up to 5.5 V.
The AT25640A provides 65 536 bits (64 K‑bit) of EEPROM memory.
The typical self‑timed write cycle is 2 ms at 5 V.
The WP pin provides hardware write protection, and the HOLD pin can pause communication.