DS1204V

w w a D . w S a t e e h U 4 t m o .c DS1204V DS1204V Electronic Key FEATURES PIN ASSIGNMENT Cannot be deciphered by reverse engineering Partitioned memory thwarts pirating User-insertable packaging sion allows personal posses- DALLAS DS1204V ELECTRONIC KEY Exclusive blank keys on request Appropriate identification can be made with a 64-bit reprogrammable memory SIDE Unreadable 64-bit security match code virtually prevents deciphering by exhaustive search with over 1019 possibilities 128 bits of secure read/write memory create additional barriers by permitting data changes as often as needed Rapid erasure of identification security match code and secure read/write memory can occur if tampering is detected Low-power CMOS circuitry Four million bps data rate Durable and rugged Applications include software authorization, gray market software protection, proprietary data, financial transactions, secure personnel areas, and system access control DESCRIPTION The DS1204V Electronic Key is a miniature security system that stores 64 bits of user-definable identification code and a 64-bit security match code that protects 128 bits of read/write nonvolatile memory. The 64-bit identification code and the security match code are programmed into the key via a special program mode operation. After programming, the key follows a procedure with a serial format to retrieve or update data. Interface cost to a microprocessor is minimized by on-chip circ...