The document introduces a unique EPROM product with 16384 bits of storage space, which communicates with the economy of one signal plus ground. It has a unique 64-bit registration number that ensures absolute traceability because no two parts are alike. The built-in multidrop controller ensures compatibility with other 1-Wire® Net products. The EPROM is partitioned into sixty-four 256-bit pages for randomly accessing packetized data records. Each memory page can be permanently write-protected to prevent tampering. The device is an “add only” memory where additional data can be programmed into EPROM without disturbing existing data. The architecture reduces control, address, data, power, and programming signals to a single data pin. It directly connects to a single port pin of a microprocessor and communicates at up to 16.3 kbits per second. The 8-bit family code specifies communications requirements to reader DS2505. The presence detector acknowledges when the reader first applies voltage. The product is available in a low-cost TO-92 or 6-pin TSOC surface mount package. It reads over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C and programs at 11.5V to 12.0V from -40°C to +50°C.
The DS2505 16‑kbit Add‑Only Memory provides 16384 bits of electrically programmable EPROM that can be accessed via a single 1‑Wire data pin. Each device carries a unique 64‑bit laser‑etched registration number (family code, 48‑bit serial number and CRC) for absolute traceability. Memory is organized into sixty‑four 256‑bit pages, each of which can be permanently write‑protected, and new data can be appended without overwriting existing content.
The part operates over a wide voltage range (2.8 V to 6.0 V for reads, 11.5 V to 12.0 V for programming) and temperature range (‑40 °C to +85 °C for operation). It draws power for read operations from the 1‑Wire line (parasite power) and requires a 12 V programming pulse at 10 mA. Typical applications include storage of calibration constants, maintenance records, asset tracking, product revision status and access codes.
| EPROM size | 16384 bits (16 kbit) |
|---|---|
| Number of pages | 64 pages of 32 bytes each |
| Read voltage range | 2.8 V to 6.0 V |
| Programming voltage | 11.5 V to 12.0 V at 10 mA |
| Data line capacitance | 800 pF |
The DS2505 can be read with a pull‑up voltage between 2.8 V and 6.0 V.
It contains 16384 bits (16 kbit) of EPROM memory.
Read operations use parasite power derived from the 1‑Wire communication line.