Maxim DS1963S-F5+, for DS1963S

4096 bits of read/write nonvolatile (NV) memory organized as 16 pages of 256 bits each Eight memory pages with individual 64-bit secrets and 32-bit read-only nonrolling-over page write-cycle counters Secrets are write-only and have their own individual write-cycle counters On-chip 512-bit SHA-1 engine to compute a 160-bit Message Authentication Codes (MAC) and generate page secrets Device can operate as a roaming iButton device or as coprocessor for a host computer 256-bit scratchpad ensures integrity of data transfer On-chip 16-bit CRC generator for safeguarding data transfers Overdrive mode boosts communication speed to 125kbps Operating temperature range from -40°C to +85°C Over 10 years of data retention Common iButton Features Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike Multidrop controller for MicroLAN Digital identification and information by momentary contact Chip-based data carrier compactly stores information Data can be accessed while affixed to object Economically communicates to host with a single digital signal at 15.4kbps Standard 16mm diameter and 1-Wire protocol ensure compatibility with iButton family of devices Applications For Electronic Payment at Local Transit Systems, Pay Phones, Parking Systems, or Vending Machines Photo ID Badges Printed circuit boards