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| DS2501-UNW/DS2505-UNW DS2501-UNW/DS2502-UNW UniqueWareTM Add Only Memory SPECIAL FEATURES TO-92 1 DALLAS DS2501/2 -UNW 2 3 4 8 7 6 5 * 512 bits (DS2501-UNW) or 1024 bits (DS2502-UNW) 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, 36-bit serialization, 12-bit UniqueWare Identifier 5E7H, 8-bit CRC-tester) assures absolute traceability because no two parts are alike. Family code 91H for the DS2501-UNW, 89H for the DS2502-UNW 8-Pin SOIC (150 MIL) See Mech. Drawings Section * Built-in multidrop controller ensures compatibility with other MicroLANTM products TSOC PACKAGE 1 2 3 654 123 * EPROM * Each partitioned into two (DS2501-UNW) or four (DS2502-UNW) 256-bit pages for randomly accessing packetized data records memory page can be permanently write-protected to prevent tampering can be programmed into EPROM without disturbing existing data 1 2 3 * Device is an "add only" memory where additional data * Reduces control, address, data, power and programming signals to a single pin BOTTOM VIEW See Mech. Drawings Section TOP VIEW 3.7 X 4.0 X 1.5 mm See Mech. Drawings Section PIN ASSIGNMENT Pin 1 Pin 2 Pin 3 Pin 4 Pins 5 to 8 TO-92 Ground Data NC ---- ---- TSOC Ground Data NC NC NC SOIC NC NC Data Ground NC * Directly connects to a single port pin of a microprocessor and communicates at up to 16.3k bits per second * Presence * Low detector acknowledges when reader first applies voltage cost TO-92 or 8-pin SOIC and TSOC surface mount packages -40C to +85C; programs at 11.5V to 12.0V from -40C to + 50C ORDERING INFORMATION DS2501-UNW DS2501S-UNW DS2501P-UNW DS2502-UNW DS2502S-UNW DS2502P-UNW TO-92 package 8-pin SOIC package 6-pin TSOC package TO-92 package 8-pin SOIC package 6-pin TSOC package * Reads over a wide voltage range of 2.8V to 6.0V from SILICON LABEL DESCRIPTION The DS2501-UNW and DS2502-UNW are factory programmed versions of the DS2502 1K-bit Add-Only Memory. They differ from the standard DS2502 in their custom ROM family code 91H (DS2501-UNW) and 89H (DS2502-UNW) respectively, and the UniqueWare Identifier 5E7 in place of the upper 12 bits of the standard serialization field. With the DS2501-UNW, the upper two memory pages are not accessible; they always read FFH and cannot be programmed. Otherwise, the electrical and logical behavior is identical to that of the DS2502. For technical details please refer to the DS2502 data sheet. The DS2501-UNW and DS2502-UNW are only available preprogrammed with customer specific and write- protected UniqueWare data. Memory pages not used for UniqueWare data can be programmed in the application. For more details on UniqueWare, please refer to the UniqueWare Project Setup Manual, available as Application Note 99 from Dallas Semiconductor. 021998 1/1 |
Price & Availability of DS2501-UNW
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