DS1991 Datasheet (Dallas Semiconductor)

DS1991, MultiKey iButton

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 acce

DS1991 Features

* 1,152-bit secure read/write, nonvolatile memory

* Secure memory cannot be deciphered www.DataSheet4U.com 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 tra