About This File
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 rhe UniqueWare Project Setup Manual, available as Application Note 99 from Dallas Semiconductor.
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