DESCRIPTION
The DS1205S MultiKey Chip is an enhanced version of the DS1204U Electronic Key which has both a standard 3-wire interface (data, clock, and reset) and a 1-wire interface. The DS1205S MultiKey has three secure read/write subkeys which are each 384 bits in length. In addition, there is a 512-bit read/write scratchpad which can be used as a non-secure data area or as a holding register for data transfer to one of the three subkeys. Each subkey within the part is uniquely addressable on byte boundaries.

FEATURES
•Three secure read/write data partitions of 384 bits each
•One non-secure read/write data partition of 512 bits
•Secure data cannot be deciphered by reverse engineering
•Guaranteed unique, 48-bit, laser etched serial number
•64-bit password and I.D. fields provide positive identi fication and security for each secure data partition
•Maximum data transfer rate of 2 million bits/second
•Low-power CMOS circuitry
•Access via 3-wire or 1-wire interface
•Applications include proprietary data, financial transactions, secure personnel areas, and systems access control