• Part: DS1991
  • Manufacturer: Dallas Semiconductor
  • Size: 326.54 KB
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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

Related Dallas Semiconductor Datasheets

Part Number Description
DS1992 (DS1992 / DS1993) 1kbit/4kbit Memory iButtonTM DS1994 4-kbit Plus Time Memory iButtonTM
DS1993 (DS1992 / DS1993) 1kbit/4kbit Memory iButtonTM DS1994 4-kbit Plus Time Memory iButtonTM
DS1994 4kb Plus Time Memory iButton
DS1995 16-kbit Memory iButton
DS1996 64kbit Memory iButtonTM

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.