This document describes the features and characteristics of the DS2408 1-Wire 8-Channel Addressable Switch, including eight channels of programmable I/O with open-drain outputs, capture of asynchronous state changes at PIO inputs, data-strobe output, etc.
The DS2408 is an 8‑channel programmable I/O 1‑Wire chip with open‑drain outputs. It features a unique 64‑bit laser‑etched ROM for individual identification and supports conditional search commands. The device can be powered parasitically from the 1‑Wire bus or from an external VCC supply, and includes a configurable RSTZ pin for reset or strobe functions.
The document includes ordering information, absolute maximum ratings, electrical characteristics, pin descriptions, typical applications, package details, and revision history. It also provides timing diagrams and guidelines for reliable operation in both standard and over‑drive modes.
| Operating voltage range | 2.8 V to 5.25 V |
|---|---|
| Operating temperature range | -40 °C to +85 °C |
| Pull‑up resistance (standard speed) | 2.2 kΩ |
| Input capacitance | 1200 pF |
| Leakage current (5.25 V) | 1 pA |
| Number of I/O channels | 8 |
| Package type | 16‑SO (150 mil) |
| Unique ROM identifier | 64‑bit laser‑etched ROM |
The DS2408 operates from 2.8 V up to 5.25 V.
The device provides eight programmable I/O channels.
Yes, the DS2408 can derive power parasitically from the 1‑Wire bus when no external VCC is connected.