DS1991 Datasheet - Dallas Semiconductor

DS1991, MultiKey iButton

DS1991 MultiKey iButtonTM www.dalsemi.com SPECIAL .
The DS1991 MultiKey iButton is a rugged read/write data carrier that acts as three separate electronic keys, offering 1,152 bits of secure, nonvolatil.

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Datasheet Details

Part number:

DS1991

Manufacturer:

Dallas Semiconductor

File Size:

326.54 KB

Description:

MultiKey iButton

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

Applications

* include secure access control, debit tokens, work-in-progress tracking, electronic travelers and proprietary data. OPERATION The DS1991 is accessed via a single data line using the 1-Wire protocol. The bus master must first provide one of the four ROM Function Commands, 1) Read ROM, 2) Match ROM, 3

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