DS2408S+

Overview

The DS2408S+ is an 8-channel programmable I/O device utilizing the 1-Wire interface, housed in a 16-pin SO package. It operates within a voltage range of 2.8V to 5.25V and supports temperatures from -40°C to +85°C. The component features open-drain outputs with a maximum on-resistance of 100Ω and typical off-resistance of 10MΩ. Standby supply current is 1µA. Communication occurs at standard speed (15.3kbps) or overdrive speed (100kbps). Each unit contains a unique factory-lasered 64-bit registration number for identification.

Feature Summary

• Eight independent programmable I/O channels with open-drain outputs
• Individual activity latches capture asynchronous state changes for bus master interrogation
• Built-in multidrop controller ensures compatibility with other 1-Wire network products
• Supports conditional search commands based on programmable PIO conditions

Applications

• Port expander for microcontrollers
• Remote multichannel sensor and actuator systems
• Communication and control units for microterminals
• Network interface for microcontroller applications

Procurement Notes

Verify the specific ordering suffix when sourcing components. The '+' suffix indicates a lead-free package configuration. The 'T&R' suffix denotes tape and reel packaging, whereas the absence of this suffix typically corresponds to tube packaging. Confirm that the selected variant matches the required mechanical form factor and environmental compliance standards for the intended assembly process.

Selection Notes

Select the DS2408S+ when a single-conductor interface is required to expand digital I/O capabilities. Ensure the system design accommodates the open-drain output structure and provides appropriate external pullup resistors. Verify that the host controller supports the 1-Wire protocol for ROM function and control command execution. Consider the optional VCC pin connection if maintaining PIO states during bus power loss is necessary.

Part Context

This component belongs to the DS2408S series of 1-Wire addressable switches manufactured by Analog Devices / Maxim Integrated. It is part of a broader family of interface ICs designed for low-cost, minimalist communication networks. The device integrates a 64-bit lasered ROM for unique identification alongside volatile register pages for control and status management within the 1-Wire ecosystem.

Replacement Considerations

The DS2408S+T&R serves as the tape and reel variant of the same functional component. No alternative cross-model substitutes are documented in the provided source material.