iButton® Specialist and Manufacturer of Dallas Keys

Password Protected 32KB EEPROM iButton


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DS1977 Password Protected 32KB EEPROM iButton®

The DS1977 is a 32KB EEPROM in a rugged, iButton® enclosure. Access to the memory can be password-protected with different passwords for read-only and full access. Data is transferred serially through the 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1977 is factory lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability. The durable stainless-steel iButton® package is highly resistant to environmental hazards such as dirt, moisture, and shock


32KB EEPROM Organized as Pages of 64 Bytes Each
Optional Password Protection with Different 64-Bit Passwords for Read and Full Access
Communicates to Host with a Single Digital Signal at Up to 15.3kbps at Standard Speed or Up to 125kbps in Overdrive Mode Using 1-Wire Protocol
Operating Range: 2.8V to 5.25V, -40°C to +85°C
Minimum 100k Write Cycles Endurance
15kV Built-in ESD Protection