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DS1207

Dallas Semiconductor
Part Number DS1207
Manufacturer Dallas Semiconductor
Description Time Key
Published Feb 21, 2006
Detailed Description 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 r...
Datasheet PDF File DS1207 PDF File

DS1207
DS1207

Overview
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 update data.
The TimeKey is set to expire from one day to 512 days or infinity, as w w t a .
D w S a e h NC RST DQ CLK GND BOTTOM: PIN VIEW 1.
0 IN t e 5 U 4 .
c m o See Mech.
Drawings Section PIN DESCRIPTION Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 No connection Reset Data input/output Clock Ground specified by the customer.
The TimeKey starts its countdown from the first access by the end user.
Interface cost to a microprocessor is minimized by on-chip circuitry that permits data transfer with ...


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