AT24C32A/64A is a 32,768/65,536-bit serial electrically erasable and programmable read only memory (EEPROM) organized as 4096/8192 words of 8 bits each. The device's cascadable feature allows up to 8 devices to share a common two-wire bus. The device is optimized for use in many automotive applications where low power and low voltage operation are essential. AT24C32A/64A is available in space saving 8-lead JEDEC SOIC and 8-lead TSSOP packages and is accessed via a 2-wire serial interface and is available in a 2.7V (2.7V to 5.5V) version.
The AT24C64A is a 64‑kilobit serial EEPROM with a two‑wire I²C interface, designed for automotive and low‑power applications. It offers standard‑voltage operation from 2.7 V to 5.5 V, 400 kHz clock rate, and up to 1 million write cycles.
The datasheet provides full pin descriptions, electrical characteristics, timing diagrams, package dimensions for SOIC and TSSOP options, and revision history. It also includes absolute maximum ratings and recommended operating conditions.
| Supply Voltage | 2.7 V – 5.5 V |
|---|---|
| Clock Frequency | 400 kHz |
| Write Cycle Time | 5 ms |
| Endurance | 1 Million Write Cycles |
| Data Retention | 100 Years |
| Operating Temperature | -40 °C to +125 °C |
| Read Current | 0.4 mA – 1.0 mA |
| Write Current | 2.0 mA – 3.0 mA |
| Memory Size | 64 Kbit (8192 × 8) |
| Package Types | 8‑lead SOIC, 8‑lead TSSOP |
The device supports a maximum clock frequency of 400 kHz.
It is rated for up to 1 million write cycles.
The AT24C64A operates from –40 °C to +125 °C.
Data is retained for up to 100 years.