The Microchip Technology Inc. 24AA64/24LC64/24FC64 (24XX64*) is a 64 Kbit Electrically Erasable PROM. The device is organized as a single block of 8K x 8-bit memory with a 2-wire serial interface. Low-voltage design permits operation down to 1.7V, with standby and active currents of only 1 μA and 1 mA, respectively. It has been developed for advanced, lowpower applications such as personal communications or data acquisition. The 24XX64 also has a page write capability for up to 32 bytes of data. Functional address lines allow up to eight devices on the same bus, for up to 512 Kbits address space. The 24XX64 is available in the standard 8-pin PDIP, surface mount SOIC, TSSOP, DFN, TDFN and MSOP packages. The 24XX64 is also available in the 5-lead SOT-23 package.

The 24XX64 supports a bidirectional, 2-wire bus and data transmission protocol. A device that sends data onto the bus is defined as transmitter, while a device receiving data is defined as a receiver. The bus has to be controlled by a master device which generates the Serial Clock (SCL), controls the bus access and generates the Start and Stop conditions, while the 24XX64 works as slave. Both master and slave can operate as transmitter or receiver, but the master device determines which mode is activated.
Features

• Single-Supply with Operation down to 1.7V for 24AA64/24FC64 devices, 2.5V for 24LC64
devices
• Low-Power CMOS Technology:
- Active current 1 mA, typical
- Standby current 1 μA, typical
• 2-Wire Serial Interface, I2C™ Compatible
• Cascadable up to 8 Devices
• Schmitt Trigger Inputs for Noise Suppression
• Output Slope Control to Eliminate Ground Bounce
• 100 kHz and 400 kHz Clock Compatibility
• 1 MHz Clock for FC versions
• Page Write Time 5 ms, typical
• Self-timed Erase/Write Cycle
• 32-Byte Page Write Buffer
• Hardware Write-protect
• ESD Protection > 4,000V
• More than 1 Million Erase/Write Cycles
• Data Retention > 200 Years
• Factory Programming Available
• Packages include 8-lead PDIP, SOIC, TSSOP, MSOP, DFN, TDFN and 5-lead SOT-23
• Pb-Free and RoHS Compliant
• Temperature Ranges:
- Industrial (I): -40°C to +85°C
- Automotive (E): -40°C to +125°C

Read more: http://ww1.microchip.com/downloads/en/DeviceDoc/21189M.pdf