DS1207

w w a D . w S a t e e h U 4 t m o .c DS1207 DS1207 TimeKey FEATURES PIN ASSIGNMENT Cannot be deciphered by reverse engineering Time allotment from one day to 512 days for trial periods, rentals, and leasing DALLAS DS1207 TimeKey Partitioned memory thwarts pirating User-insertable possession packaging allows personal Exclusive blank keys on request Appropriate identification can be made with a 64-bit reprogrammable memory SIDE Unreadable 64-bit match code virtually prevents discovery by exhaustive search with over 1019 possibilities obscures real accesses 1 Random data generation on incorrect match codes 384 bits of secure read/write memory create additional barriers by permitting data changes as often as needed and secure read/write memory can occur if tampering is detected Rapid erasure of identification, security match code Durable and rugged Applications include software authorization, gray market software protection, proprietary data, financial transactions, secure personnel areas, and system access control DESCRIPTION The DS1207 TimeKey is a miniature security system that stores 64 bits of user-definable identification code and a 64-bit security match code that protects 384 bits of read/write nonvolatile memory. The 64-bit identification code and the security match code are programmed into the TimeKey via a special program mode operation. After programming, the TimeKey follows a procedure with a serial format to retrieve or u...