View ds2502 e datasheet:

DS2502-E64 IEEE EUI-64 Node Address Chip www.dalsemi.com FEATURES PIN ASSIGNMENT IEEE-approved factory programmed 64-bit TSOC PACKAGE TO-92 node address chip (EUI-64) with 768 bits DS2502-E64 user-programmable OTP-EPROM YYWWRR communicates with the economy of one CCCCCC signal plus ground E 6 4 Meets the node identification requirements of 2 5 0 2 YYWW IEEE Standard 1394-1995 (FireWire?) Unique, factory-lasered and tested 64-bit registration number (8-bit family code 89H + 36-bit serial number + 12-bit UniqueWare TOP VIEW THE DOT MARKS PIN 1 identifier 5E7H + 8-bit CRC tester) assures absolute traceability because no two parts are alike YYWW = DATE CODE RR = DIE REVISION CODE Built-in multidrop controller ensures CCCCCC = COUNTRY CODE compatibility with oth