The AT34C02B is a serial electrically-erasable and programmable read only memory (EEPROM) with 256 x 8 bits organization. It features permanent and reversible software write protection for the first-half of the array, hardware write protection for the entire array, low-voltage and standard-voltage operation, two-wire serial interface, bidirectional data transfer protocol, and compatibility with different clock speeds. It also has high-reliability with endurance of 1 million write cycles and data retention of 100 years. The package options include JEDEC SOIC, Ultra Thin Mini-MAP (MLP 2x3), TSSOP, and dBGA2.
The document describes the Atmel AT34C02B, a two-wire serial electrically-erasable programmable read-only memory (EEPROM) organized as 256 words of 8 bits each. It provides permanent and reversible software write protection for the first-half of the array, along with hardware write protection for the entire array via an external pin.
The device operates at low voltages ranging from 1.7V to 3.6V and supports clock frequencies up to 400 kHz. It is available in various space-saving packages including SOIC, TSSOP, Mini-Map, and dBGa2.
| Capacity | 2048 bits (256 x 8) |
|---|---|
| Operating Voltage | 1.7V to 3.6V |
| Clock Frequency | Up to 400 kHz |
| Write Cycle Time | 5 ms max |
| Endurance | 1 Million Write Cycles |
| Data Retention | 100 Years |
Hardware write protection is controlled by an external WP pin; connecting it to Vcc inhibits all write operations.
The self-timed write cycle takes a maximum of 5 ms.
The device has an endurance rating of 1 Million Write Cycles.