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These are 2-Wire Serial EEPROMs.

The AT24C256 provides 262,144 bits of serial electrically erasable and programmable read only memory (EEPROM) organized as 32,768 words of 8 bits each. The device’s cascadable feature allows up to 4 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 devices are available in space-saving 8-pin JEDEC PDIP, 8-pin EIAJ, 8-pin JEDEC SOIC, 14-pin TSSOP, and 8-pin LAP 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.



  • 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)

  • Internally Organized  32,768 x 8
  • 2-Wire Serial Interface
  • Schmitt Trigger, Filtered Inputs for Noise Suppression
  • Bidirectional Data Transfer Protocol
  • 1 MHz (5V), 400 kHz (2.7V) and 100 kHz (1.8V) Compatibility
  • Write Protect Pin for Hardware and Software Data Protection
  • 64-Byte Page Write Mode (Partial Page Writes Allowed)
  • Self-Timed Write Cycle (5 ms typical)
  • High Reliability

– Endurance: 100,000 Write Cycles
– Data Retention: 40 Years
– ESD Protection: > 4000V

  • Automotive Grade and Extended Temperature Devices Available
  • 8-Pin JEDEC PDIP, 8-Pin JEDEC and EIAJ SOIC, 14-Pin TSSOP, and 8-Pin Leadless Array Packages
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