Description
The AT24C64B provides 65,536 bits of serial electrically erasable and programmable read only memory (EEPROM) organized as 8192 words of 8 bits each. The device’s cascadable feature allows up to 8 devices to share a common 2-wire bus. The device is optimized for use in many industrial and commercial applications where low power and low voltage operation are essential. The AT24C64B is available in space saving 8-lead PDIP, 8-lead JEDEC SOIC and 8-lead TSSOP packages and is accessed via a 2-wire serial interface. In addition, the entire family is available in 2.7V (2.7 to 5.5V) and 1.8V (1.8 to 5.5V) versions.

Features
• Low-voltage and Standard-voltage Operation
   – 2.7 (VCC = 2.7 to 5.5V)
   – 1.8 (VCC = 1.8 to 5.5V)
• Low-power Devices (ISB = 6 µA at 5.5V) Available
• Internally Organized 8192 x 8
• 2-Wire Serial Interface
• Schmitt Trigger, Filtered Inputs for Noise Suppression
• Bi-directional Data Transfer Protocol
• 400 kHz Clock Rate
• Write Protect Pin for Hardware Data Protection
• 32-Byte Page Write Mode (Partial Page Writes Allowed)
• Self-Timed Write Cycle (5 ms max)
• High Reliability
   – Endurance: 1 Million Write Cycles
   – Data Retention: 100 Years
• Lead-free/Halogen-free Devices Available
• 8-lead PDIP, 8-lead JEDEC SOIC and 8-lead TSSOP Packages