DS1205S

DS1205S DS1205S MultiKey Chip FEATURES PIN ASSIGNMENT VCCI NC RST DQ NC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCCO NC I/O GND NC DQOE NC BAT Three each secure read/write data partitions of 384 bits One non-secure read/write data partition of 512 bits Secure data cannot be deciphered by reverse engineering Guaranteed number unique, 48-bit, laser etched serial CLK NC GND 64-bit password and I.D. fields provide positive identification 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 DS1205S 16-Pin SOIC (300 mil) See Mech. Drawings Section PIN DESCRIPTION VCCI RST DQ CLK GND BAT DQOE I/O VCCO – – – – – – – – – +5V Supply (Battery Backup Mode) Reset (3-Wire) Data (3-Wire) Clock (3-Wire) Ground Battery (+) (Battery Backup Mode) Data Available (3-Wire) Data I/O (1-Wire) Battery (+) (Battery Powered Mode) 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 thr...