DS2506

DS2506 64-kbit Add-Only Memory www.dalsemi.com FEATURES 65536 bits Electrically Programmable Read Only Memory (EPROM) communicates with the economy of one signal plus ground 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 Built-in multidrop controller ensures compatibility with other MicroLAN products EPROM partitioned into two hundred fifty six 256-bit pages for randomly accessing packetized data records Each memory page can be permanently writeprotected to prevent tampering Device is an “add only” memory where additional data can be programmed into EPROM without disturbing existing data Architecture allows software to patch data by superseding an old page in favor of a newly programmed page Reduces control, address, data, power, and programming signals to a single data pin Directly connects to a single port pin of a microprocessor and communicates at up to 16.3 kbits per second Overdrive mode boosts communication speed to 142 kbits per second 8-bit family code specifies DS2506 communications requirements to reader Presence detector acknowledges when the reader first applies voltage Low cost PR35 or 8-pin SOIC surface mount package 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 PIN ASSIGNMENT PR-35 DALLAS DS2506 NC NC DATA GND 1 2 3 4 8 7 6 5 NC NC NC NC 8-PIN SOIC (208...