DS1991 Description
The DS1991 MultiKey iButton is a rugged read/write data carrier that acts as three separate electronic keys, offering 1,152 bits of secure, nonvolatile memory. Each key is 384 bits long with distinct 64-bit password and public ID fields (Figure 1). The password field must be matched in order to access the secure memory.
DS1991 Key Features
- Secure memory cannot be deciphered .. without matching 64-bit password
- Memory is partitioned into 3 blocks of 384 bits each
- 64-bit password and ID fields for each memory block
- 512-bit scratchpad ensures data transfer integrity
- Operating temperature range: -40°C to +70°C
- Over 10 years of data retention
- Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48bit serial number + 8-bit CRC teste