M24C64-WDW6TP

• 64 Kilobit Serial EEPROM, 8192 Words of 8 Bits
• I2C Two-Wire Interface at Up to 400 Kilohertz
• 2.5V to 5.5V Supply operation, 5 mA Nominal Supply Current
• 900 Ns Access Time
• 8-Pin TSSOP package, 3mm by 4.4mm, 1mm Height
• -40C to 85C Operating range, Lead-Free and RoHS Compliant

The STMicroelectronics M24C64-WDW6TP is a 64 kb serial EEPROM organised as 8192 words of 8 bits with an I2C two-wire interface, supplied in an 8-pin TSSOP measuring 3mm by 4.4mm with a 1mm height. EEPROM is byte-alterable non-volatile memory, so an individual byte can be rewritten in place without erasing a surrounding block - the property that separates it from flash for configuration and calibration storage. It operates from a 2.5V to 5.5V supply at up to 400 k Hz with a 900 ns access time and 5 mA nominal supply current, and is specified from -40C to 85C. Note the part is marked NRND in the catalog, so it should be treated as a sustaining buy against installed demand rather than a new-design selection.

Serial EEPROMs hold the data a product must remember across power cycles but that is too small to justify a flash device: calibration constants, serial numbers and board revision codes, user settings and presets, fault and trip counters, hour meters, and identification data a host reads over I2C at start-up. At 8 kilobytes the density suits a few thousand parameters or a small lookup table rather than a firmware image. The 2.5V to 5.5V range lets one part number serve both 3.3V and 5V designs, which is why this family appears across widely different products. Because this device is marked NRND, buyers should size a last-time buy against installed demand and qualify a current alternative for anything new.