Analog Devices Inc./Maxim Integrated DS2406P/T&R

Overview

DS2406P/T&R from Maxim Integrated (now Analog Devices) is a dual-channel addressable 1-Wire switch with 1024-bit OTP EPROM, designed for remote open-drain transistor control and status monitoring in closed-loop sensor/actuator systems. It features two independently controllable PIO channels (A and B), 64-bit unique ROM identity, CRC16 error detection, and operates parasitically or with optional V_CC supply. Used in industrial asset tagging, environmental sensor nodes, and legacy 1-Wire infrastructure.

For engineers reviewing the DS2406P/T&R datasheet, DS2406P/T&R pinout, DS2406P/T&R application, or DS2406P/T&R equivalent, key selection criteria include 1-Wire bus compatibility, PIO sink capability (50mA @ 0.4V for channel A), 13V max operating voltage on PIO-A, TSOC-6 package dimensions, and conditional search support for multi-device network management.

Technical Context

The DS2406P/T&R implements a hierarchical 1-Wire protocol stack with ROM function commands (e.g., Conditional Search) followed by memory/PIO control functions. Its internal architecture integrates a 64-bit lasered ROM, 1024-bit EPROM organized in four 32-byte pages, 8-byte status memory (7 bytes EPROM + 1 byte SRAM), and PIO-control logic with channel flip-flops mapped to status register bit 5–6.

It supports parasite power operation from 2.8V to 6.0V across –40°C to +85°C, with optional V_CC bondout (TSOC only) for stable bias during long low-time bus conditions. EPROM programming requires 12V pulses applied via the 1-Wire line, and all data transfers occur LSB-first with CRC16 validation at multiple protocol stages.

Key Specifications

Pinout & Package

DS2406P/T&R is supplied in a 6-pin TSOC (Thin Small Outline Carrier) package with exposed pad, optimized for automated tape-and-reel handling and compact PCB layouts. Pin 4 is V_CC bondout (optional external supply), Pin 5 is NC, and Pins 1–3 and 6 serve ground, data, PIO-A, and PIO-B respectively.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel 1-Wire switch applications.

Compared with DS2407P+T&R, DS2406P/T&R removes Hidden Mode complexity and fixed power-on defaults - simplifying firmware integration. Against DS2413P+T&R, it trades ADC capability for 1024-bit OTP EPROM - prioritizing long-term identity and metadata retention over real-time sensing.

Availability

DS2406P/T&R is available at Aetrix Electronics and suitable for industrial asset tagging, environmental sensor nodes, legacy building automation, and secure access control points requiring stable component supply and long-term obsolescence support.

Supply support for DS2406P/T&R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (acquired by Analog Devices in 2021) designs precision analog and mixed-signal ICs for industrial, automotive, and communications markets, emphasizing reliability and integration.

The DS2406P/T&R belongs to Maxim's 1-Wire® addressable switch family, engineered specifically for distributed, low-wire-count control and identification in harsh or space-constrained environments.

FAQ

What is the primary function of the DS2406P/T&R in a 1-Wire network?

The DS2406P/T&R serves as a dual-channel addressable switch with integrated 1024-bit OTP EPROM, enabling remote control and status monitoring of two open-drain outputs (PIO-A and PIO-B) over a single 1-Wire bus. Its 64-bit unique ROM ensures device-level identification, while the EPROM stores persistent configuration or labeling data - making DS2406P/T&R ideal for asset tracking and closed-loop industrial I/O.

Does the DS2406P/T&R require an external power supply, or can it operate parasitically?

The DS2406P/T&R supports both parasitic and externally powered operation. In parasite mode, it draws energy from the 1-Wire bus during high-time intervals; for applications with long bus low-times or intermittent connectivity, the V_CC pin (Pin 4, TSOC only) accepts an external 2.8V–6.0V supply to maintain stable operation - a capability confirmed in the DS2406P/T&R datasheet and mechanical drawings.

How does the DS2406P/T&R handle memory programming and data integrity?

DS2406P/T&R uses a two-phase write process: first loading data into an 8-bit scratchpad with CRC16 validation, then applying a 12V programming pulse to commit to EPROM. Each page (32 bytes) can be individually write-protected via status memory bits, and Extended Read Memory provides per-page CRCs - ensuring DS2406P/T&R maintains data fidelity across field deployments without requiring host-side redundancy.

What is the significance of the Conditional Search feature in the DS2406P/T&R?

Conditional Search allows a 1-Wire bus master to discover only DS2406P/T&R devices meeting specific criteria - such as PIO-A = low, PIO-B = high, or custom status memory flags - without polling every node. This reduces bus traffic and latency in networks with dozens of DS2406P/T&R units, directly improving scalability in large-scale sensor or control systems.

Can the DS2406P/T&R replace the DS2407P+T&R in an existing design?

Yes, the DS2406P/T&R is fully pin-compatible and functionally compatible with the DS2407P+T&R, except it omits Hidden Mode and user-programmable power-on settings. If the original design does not rely on those features, DS2406P/T&R can be substituted without PCB changes - and its simplified initialization improves firmware robustness in new implementations.