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 automotive applications where low-power and low-voltage operation are essential. The devices are available in space-saving 8-lead JEDEC SOIC and 8-lead TSSOP packages.

Features
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
   – Data Sheet Describes Mode 0 Operation
• Standard-voltage Operation
   – 2.7 (VCC = 2.7V to 5.5V)
• Automotive Temperature Range −40°C to +125°C
• 5 MHz Clock Rate
• 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
• 8-lead JEDEC SOIC and 8-lead TSSOP Packages