DS1204V

• Cannot be deciphered by reverse engineering
• Partitioned memory thwarts pirating
• User-insertable packaging allows personal possession
• Exclusive blank keys on request
• Appropriate identification can be made with a 64-bit reprogrammable memory
•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

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 DS1204V follows a procedure with a serial format to retrieve or update data. Interface cost to a microprocessor is minimized by on-chip circuitry that permits data transfer with only three signals: Clock (CLK), Reset (RST), and Data Input/Output (DQ). Low pin count and a guided entry for mating receptacle overcome mechanical problems normally encountered with conventional integrated circuit packaging, making DS1204V transportable and user-insertable.