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The AT24C64A is a serial EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by Atmel (now part of Microchip Technology). Below are its key specifications, descriptions, and features:

Specifications:

• Memory Size: 64 Kbit (8 KB)
• Organization: 8192 x 8 bits
• Interface: I²C-compatible (2-wire serial interface)
• Operating Voltage: 1.7V to 5.5V
• Clock Frequency: Up to 400 kHz (Fast-mode) / 1 MHz (Fast-mode Plus)
• Write Cycle Time: 5 ms (max)
• Endurance: 1,000,000 write cycles (min)
• Data Retention: 100 years (min)
• Page Size: 32 bytes
• Operating Temperature Range: -40°C to +85°C (Industrial)
• Package Options: 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead TSSOP, and 8-lead UDFN

Descriptions:

• The AT24C64A is a low-power, high-reliability EEPROM designed for storing small amounts of non-volatile data.
• It supports sequential read operations and byte/page write operations.
• Features a built-in write protection mechanism (via WP pin) to prevent accidental writes.
• Compatible with standard I²C protocols, making it easy to interface with microcontrollers.

Features:

• Low Power Consumption: Active read current (1 mA @ 5.5V), standby current (6 µA @ 5.5V).
• Hardware Write Protection: WP pin enables/disable write operations.
• Self-Timed Write Cycle: Automatic erase and program timing.
• Partial Page Writes Allowed: Up to 32 bytes per page.
• Noise Filtering: Built-in Schmitt triggers for noise suppression.
• Extended Temperature Range: Suitable for industrial applications.

The AT24C64A is commonly used in applications requiring non-volatile storage, such as consumer electronics, industrial systems, and embedded devices.