Analog Devices Inc./Maxim Integrated DS2406P

Overview

DS2406P from Maxim Integrated (now Analog Devices) is a dual addressable open-drain switch IC with 1024-bit one-time programmable EPROM, designed for closed-loop 1-Wire® remote control and monitoring of two independent PIO channels (A and B). It features factory-lasered 64-bit ROM for absolute device identity, CRC16 error detection, and operates parasitically or with optional V_CC supply in TO-92 or 6-pin TSOC packages. Used in industrial sensor tagging and distributed I/O control.

For engineers reviewing the DS2406P datasheet, DS2406P pinout, DS2406P application, or DS2406P equivalent, key selection criteria include 1-Wire bus compatibility, PIO sink capability (50mA @ 0.4V for channel A), OTP memory size and write-protection architecture, conditional search support, and TSOC package pinout with V_CC bondout.

Technical Context

The DS2406P implements a hierarchical 1-Wire protocol stack with ROM function commands (Read/Match/Search/Skip/Conditional Search) followed by memory and PIO-control functions. Its internal architecture integrates a 64-bit lasered ROM, 1024-bit EPROM (4 × 32-byte pages), 8-byte status memory (7 bytes EPROM + 1 byte SRAM), and dual-channel PIO control logic with flip-flop state registers.

It supports parasite power operation from 2.8V to 6.0V across –40°C to +85°C, with optional V_CC supply (TSOC only) enabling stable operation during long low-bus periods. Programming requires 12V pulses on the 1-Wire line, and all data transfers occur LSB-first with CRC16 validation at multiple protocol layers.

Key Specifications

Pinout & Package

DS2406P is supplied in a 6-pin TSOC (Thin Small Outline Package) with exposed pad, optimized for surface-mount assembly and thermal performance in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-switch-plus-memory applications.

Compared with DS2406P, DS2406+ offers identical functionality in TO-92 but sacrifices V_CC support and surface-mount compatibility, while DS2407P adds configurability at the cost of increased initialization complexity and non-interchangeable status memory behavior.

Availability

DS2406P is available at Aetrix Electronics and suitable for industrial asset tagging, remote sensor node control, multi-drop I/O expansion, and secure equipment authentication requiring stable component supply and long-term lifecycle support.

Supply support for DS2406P 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) is a semiconductor company specializing in precision analog, mixed-signal, and digital ICs for industrial, automotive, and communications systems.

The DS2406P belongs to Maxim's 1-Wire® addressable switch and memory product line, engineered for simplified distributed control and identification in harsh, space-constrained environments where minimal wiring and guaranteed device uniqueness are critical.

FAQ

What is the maximum sink current capability of DS2406P's PIO-A and PIO-B channels?

The DS2406P PIO-A channel supports up to 50mA sink current at 0.4V with soft turn-on characteristics, making it suitable for driving small relays or indicator LEDs directly. PIO-B provides 8mA sink capability at 0.4V, optimized for logic-level interfacing and feedback signaling. These values are measured under specified operating conditions and must not be exceeded to ensure reliable DS2406P operation and longevity.

Does DS2406P require an external power supply, or can it operate parasitically?

The DS2406P supports both parasitic power operation (2.8V to 6.0V, –40°C to +85°C) and optional external V_CC supply via Pin 4 in the TSOC package. Parasite mode eliminates the need for a separate power rail but may limit performance during extended low-bus periods; V_CC connection ensures deterministic timing and robustness in demanding industrial applications involving the DS2406P.

How does the 1024-bit EPROM memory in DS2406P support data integrity and update flexibility?

The DS2406P's 1024-bit EPROM is organized into four 32-byte pages with per-page write-protection bits in status memory (addresses 0–3), preventing accidental overwrite. Page redirection bytes (addresses 1–4) allow software to logically invalidate and remap pages - enabling "data patching" without physical reprogramming. All writes require 12V programming pulses and CRC16 validation, ensuring DS2406P memory integrity across its lifetime.

Can multiple DS2406P devices share the same 1-Wire bus, and how is individual addressing handled?

Yes, multiple DS2406P devices can coexist on a single 1-Wire bus. Each DS2406P contains a factory-lasered 64-bit ROM (family code 12h + unique 48-bit serial + 8-bit CRC), enabling absolute device identification. The bus master uses ROM function commands (Match ROM, Search ROM, Conditional Search ROM) to select and communicate with individual DS2406P units - ensuring conflict-free, scalable multi-node control without address conflicts.

What is the purpose of the V_CC pin on the DS2406P TSOC package, and is it mandatory?

The V_CC pin (Pin 4) on the DS2406P TSOC package provides an optional external power supply path to stabilize internal circuitry during long 1-Wire bus low-times or high-capacitance conditions where parasite power may be insufficient. It is not mandatory - DS2406P operates fully in parasite mode - but improves reliability in electrically noisy or marginally powered systems. When unused, V_CC must be left floating or tied to ground per layout guidelines to avoid latch-up.