The CAT24FC65/66 is a 64k-bit Serial CMOS EEPROM internally organized as 8,192 words of 8 bits each. The device features a 64-byte page write buffer. The device operates via the I2C bus serial interface and is available in 8-pin DIP, SOIC, TSSOP and TDFN packages.
The CAT24FC65 and CAT24FC66 are 64‑Kbit serial CMOS EEPROMs that communicate over an I²C bus. They feature a 64‑byte page write buffer, up to 1 M write‑erase cycles per byte, and 100‑year data retention. The devices operate from 2.5 V to 5.5 V and support a maximum I²C clock frequency of 400 kHz.
The datasheet provides detailed pin configurations for DIP, SOIC, TSSOP and TDFN packages, electrical characteristics, timing diagrams for read and write operations, and ordering information. It also describes the write‑protect feature that can protect the bottom or top quarter of the memory array when the WP pin is tied to Vcc.
| Endurance | 1,000,000 cycles per byte |
|---|---|
| Data retention | 100 years |
| Supply voltage (Vcc) | +2.5 V to +5.5 V |
| Write cycle time | 5 ms max |
| Operating temperature range | -55 °C to +125 °C (industrial) |
Each byte can be programmed and erased up to 1 million times.
Data is retained for 100 years under specified conditions.
The EEPROM operates from +2.5 V to +5.5 V.