Description
The AT25128A/256A provides 131,072/262,144 bits of serial electrically-erasable programmable read only memory (EEPROM) organized as 16,384/32,768 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The devices are available in space saving 8-lead PDIP, 8-lead EIAJ SOIC, 8-lead JEDEC SOIC, 8-lead TSSOP, 8-ball dBGA2 and 8-lead SAP packages. In addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 5.5V) versions.

FEATUREs
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
• Data Sheet Describes Mode 0 Operation
• Low-voltage and Standard-voltage Operation
   – 2.7 (VCC = 2.7V to 5.5V)
   – 1.8 (VCC = 1.8V to 5.5V)
• 20 MHz Clock Rate (5V)
• 64-byte Page Mode and Byte Write Operation
• Block Write Protection
   – Protect 1/4, 1/2, or Entire Array
• Write Protect (WP) Pin and Write Disable Instructions for Both Hardware and Software Data Protection
• Self-timed Write Cycle (5 ms Max)
• High-reliability
   – Endurance: 1 Million Write Cycles
   – Data Retention: >100 Years
• Automotive Grade, Extended Temperature and Lead-free/Halogen-free Devices Available
• 8-lead PDIP, 8-lead EIAJ SOIC, 8-lead JEDEC SOIC, 8-lead TSSOP, 8-ball dBGA2 and 8-lead SAP Packages
• Die Sales: Wafer Form, Waffle Pack, and Bumped Die