Description
The AT25128/256 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-pin PDIP (AT25128/256), 8-pin EIAJ SOIC (AT25128/256), 8-pin and 16-pin JEDEC SOIC (AT25128), 14-pin TSSOP (AT25128), 20-pin TSSOP (AT25128/256), and 8-pin Leadless Array (AT25128/256) packages. In addition, the entire family is available in 5.0V (4.5V to 5.5V), 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 3.6V) versions.

FEATUREs
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
• Low Voltage and Standard Voltage Operation
   – 5.0 (VCC = 4.5V to 5.5V)
   – 2.7 (VCC = 2.7V to 5.5V)
   – 1.8 (VCC = 1.8V to 3.6V)
• 3 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 Typical)
• High Reliability
   – Endurance: 100,000 Write Cycles
   – Data Retention: >200 Years
   – ESD Protection: >4000V
• Automotive Grade and Extended Temperature Devices Available
• 8-Pin PDIP, 8-Pin EIAJ SOIC, 8-Pin and 16-Pin JEDEC SOIC, 14-Pin and 20-Pin TSSOP, and 8-Pin Leadless Array Packages