GLOBAL INDENTIFIER DESCRIPTION

The DS2502-E64 is a variant of the DS2502 1024-bit Add-Only Memory. It differs from the standard DS2502 in its custom ROM family code 89H, and the UniqueWare Identifier 5E7 in place of the upper 12 bits of the standard ROM serialization field. Otherwise, the electrical and logical behavior is identical to that of the DS2502. For technical details please refer to the DS2502 data sheet. The first 32 bytes of the DS2502-E64’s EPROM memory contain a globally unique 64-bit node address (EUI-64) and are write-protected.

FEATURES

■ IEEE-approved factory programmed 64-bit node address chip (EUI-64) with 768 bits user-programmable OTP-EPROM communicates with the economy of one signal plus ground

■ Meets the node identification requirements of IEEE Standard 1394-1995 (FireWireä )

■ Unique, factory-lasered and tested 64-bit registration number (8-bit family code 89H + 36-bit serial number + 12-bit UniqueWare identifier 5E7H + 8-bit CRC tester) assures absolute traceability because no two parts are alike

■ Built-in multidrop controller ensures compatibility with other MicroLAN products

■ Device is an “add only” memory where additional data can be programmed into EPROM without disturbing existing data

■ Reduces control, address, data, power and programming signals to a single pin

■ Directly connects to a single port pin of a microprocessor and communicates at up to 16.3k bits per second

■ Presence detector acknowledges when reader first applies voltage

■ Low cost TO-92 or TSOC surface mount packages

■ Reads over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C; programs at 11.5V to 12.0V from -40°C to +50°C