AT24C256C IC-Compatible (2-Wire) Serial EEPROM 256Kbit (32,768 x 8) Features Low-Voltage and Standard-Voltage Operation: V = 1.7V to 5.5V CC Internally Organized as 32,768 x 8 (256K) Industrial Temperature Range: -40C to +85C 2 I C-Compatible (2-Wire) Serial Interface: 100 kHz Standard mode, 1.7V to 5.5V 400 kHz Fast mode, 1.7V to 5.5V 1 MHz Fast Mode Plus (FM+), 2.5V to 5.5V Schmitt Trigger, Filtered Inputs for Noise Suppression Bidirectional Data Transfer Protocol WriteProtect Pin for Full Array Hardware Data Protection Ultra Low Active Current (3 mA maximum) and Standby Current (6 A maximum) 64-Byte Page Write Mode: Partial page writes allowed Random and Sequential Read Modes Self Timed Write Cycle within 5 ms Maximum ESD Protection > 4,000V High Reliability: Endurance: 1,000,000 write cycles Data retention: 100 years Green Package Options (Lead-free/Halide-free/RoHS compliant) Die Sale Options: Wafer Form and Bumped Wafers Packages 8-Lead SOIC, 8-Lead TSSOP, 8-Pad UDFN and 8-Ball VFBGA Datasheet DS20006042A-page 1 2018 Microchip Technology Inc. AT24C256C Table of Contents Features.......................................................................................................................... 1 Packages.........................................................................................................................1 1. Package Types (not to scale).................................................................................... 4 2. Pin Descriptions.........................................................................................................5 2.1. Device Address Inputs (A0, A1, A2).............................................................................................5 2.2. Ground......................................................................................................................................... 5 2.3. Serial Data (SDA).........................................................................................................................5 2.4. Serial Clock (SCL)........................................................................................................................5 2.5. Write-Protect (WP)....................................................................................................................... 6 2.6. Device Power Supply................................................................................................................... 6 3. Description.................................................................................................................7 3.1. System Configuration Using 2-Wire Serial EEPROMs ................................................................7 3.2. Block Diagram..............................................................................................................................8 4. Electrical Characteristics........................................................................................... 9 4.1. Absolute Maximum Ratings..........................................................................................................9 4.2. DC and AC Operating Range.......................................................................................................9 4.3. DC Characteristics....................................................................................................................... 9 4.4. AC Characteristics......................................................................................................................10 4.5. Electrical Specifications..............................................................................................................11 5. Device Operation and Communication....................................................................13 5.1. Clock and Data Transition Requirements...................................................................................13 5.2. Start and Stop Conditions.......................................................................................................... 13 5.3. Acknowledge and No-Acknowledge...........................................................................................14 5.4. Standby Mode............................................................................................................................ 14 5.5. Software Reset...........................................................................................................................15 6. Memory Organization.............................................................................................. 16 6.1. Device Addressing..................................................................................................................... 16 7. Write Operations......................................................................................................18 7.1. Byte Write...................................................................................................................................18 7.2. Page Write..................................................................................................................................18 7.3. Acknowledge Polling.................................................................................................................. 19 7.4. Write Cycle Timing..................................................................................................................... 19 7.5. Write Protection..........................................................................................................................20 8. Read Operations..................................................................................................... 21 8.1. Current Address Read................................................................................................................21 8.2. Random Read............................................................................................................................ 21 DS20006042A-page 2 Datasheet 2018 Microchip Technology Inc.