Maxim DS1963S-F5+, for DS1963S

4096 bits of read/write nonvolatile (NV) memory organized as 16 pages of 256 bits eachEight memory pages with individual 64-bit secrets and 32-bit read-only nonrolling-over page write-cycle countersSecrets are write-only and have their own individual write-cycle countersOn-chip 512-bit SHA-1 engine to compute a 160-bit Message Authentication Codes (MAC) and generate page secretsDevice can operate as a roaming iButton device or as coprocessor for a host computer256-bit scratchpad ensures integrity of data transferOn-chip 16-bit CRC generator for safeguarding data transfersOverdrive mode boosts communication speed to 125kbpsOperating temperature range from -40°C to +85°COver 10 years of data retention Common iButton FeaturesUnique, 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 alikeMultidrop controller for MicroLANDigital identification and information by momentary contactChip-based data carrier compactly stores informationData can be accessed while affixed to objectEconomically communicates to host with a single digital signal at 15.4kbpsStandard 16mm diameter and 1-Wire protocol ensure compatibility with iButton family of devices ApplicationsFor Electronic Payment at Local Transit Systems, Pay Phones, Parking Systems, or Vending MachinesPhoto ID BadgesPrinted circuit boards