DS2502 1024-bit Electrically Programmable Read Only Memory (EPROM)
The DS2502 1 kbit Add‑Only Memory provides 1024 bits of electrically programmable EPROM organized into four 32‑byte pages. Each page can be permanently write‑protected, and the device supports a “add‑only” operation where new data can be appended without overwriting existing bits. Communication uses a single‑wire data line that also supplies parasite power for read operations.
The device includes a unique 64‑bit laser‑etched ROM code (family code, 48‑bit serial number, CRC) for absolute traceability, and a set of EPROM status bytes that allow page‑write protection and address redirection for data patching. Electrical specifications cover a 2.8 V–6.0 V operating range, programming voltage of 11.5 V–12.0 V at 10 mA, and an operating temperature range of –40 °C to +85 °C.
| Memory capacity | 1 kbit (1024 bits) |
|---|---|
| Number of EPROM pages | 4 pages of 32 bytes each |
| Operating voltage (read) | 2.8 V to 6.0 V |
| Programming voltage | 11.5 V to 12.0 V at 10 mA |
| Logic‑1 voltage (typical) | 2.2 V |
| Logic‑0 voltage range | -0.3 V to +0.8 V |
| Output low voltage @ 4 mA | 0.4 V |
| Input load current | 5 µA |
The DS2502 provides 1 kbit (1024 bits) of add‑only EPROM memory.
The EPROM is divided into four pages, each 32 bytes (256 bits) in size.
Programming requires a voltage of 11.5 V to 12.0 V at about 10 mA.