DS1204V Datasheet | Dallas Semiconductor

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 circuitry that permits data transfer with only three signals: Clock (CLK), Reset (RST), and Data Input/Output (DQ). w w t a .D w S a e h BOTTOM: PIN VIEW 1.0 IN t e U 4 .c m o See Mech. Drawings Section PIN DESCRIPTION Pin 1 - VCC Pin 2 - RST Pin 3 - DQ Pin 4 - CLK Pin 5 - GND +5 Volts Reset Data Input/Output Clock Ground Low pin count and a guided entry for mating receptacle overe mechanical problems normally encountered with conventional integrated circuit packaging, making the device transportable and user-insertable. OPERATION - NORMAL MODE The...