Analog Devices Inc./Maxim Integrated DS2405Z/T&R

Overview

DS2405Z/T&R from Maxim Integrated is an addressable 1-Wire® open-drain N-channel switch IC with factory-lasered 64-bit ROM (8-bit family code 05h, 48-bit serial number, 8-bit CRC), 4mA PIO sink capability at 0.4V, operation from 2.8V to 6.0V across –40°C to +85°C, and TSOC-6 surface-mount package. It enables remote on/off control and state sensing of individual nodes in multidrop MicroLAN systems.

For engineers reviewing the DS2405Z/T&R datasheet, DS2405Z/T&R pinout, DS2405Z/T&R application, or DS2405Z/T&R equivalent, this device serves as a low-power, single-wire-addressable switch for distributed sensor node identification, tamper-evident enclosure control, and parasitically powered I/O expansion where pin count and wiring simplicity are critical.

Technical Context

The DS2405Z/T&R implements a 1-Wire slave protocol with embedded multidrop controller logic, supporting five ROM function commands (Read ROM, Match ROM, Search ROM, Active-Only Search ROM, Skip ROM) to uniquely identify and address devices on a shared bus. Its internal circuitry includes parasitic power harvesting via the DATA line and a dedicated PIO output stage capable of sinking ≥4mA.

Communication occurs at up to 16.3kbits/s using strict timing-defined time slots (tSLOT = 60–120μs), with reset/presence pulse detection and CRC-8 validation (x⁸ + x⁵ + x⁴ + 1) ensuring error-free ROM access and PIO state reporting without external power supply.

Key Specifications

Pinout & Package

DS2405Z/T&R is supplied in a 6-pin TSOC surface-mount package (3.7mm × 4.0mm × 1.5mm), optimized for automated assembly and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar addressable switch applications.

Compared with DS2405Z/T&R, DS2413Z/T&R offers doubled I/O density and higher drive strength in identical packaging, while DS2406P/T&R trades PIO-only functionality for integrated EEPROM at the cost of larger size and missing Active-Only Search - making DS2405Z/T&R optimal for minimal-footprint, high-reliability single-output applications.

Availability

DS2405Z/T&R is available at Aetrix Electronics and suitable for industrial sensor node identification, tamper-evident enclosure monitoring, and distributed I/O expansion requiring stable component supply and long-term lifecycle support.

Supply support for DS2405Z/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 (now part of Analog Devices) designs precision analog, mixed-signal, and digital ICs for industrial, communications, computing, and consumer applications.

The DS2405Z/T&R belongs to Maxim's 1-Wire addressable switch product line, engineered specifically for parasitically powered, multi-node identification and control in resource-constrained embedded systems.

FAQ

What is the primary function of the DS2405Z/T&R in a 1-Wire network?

The DS2405Z/T&R functions as an addressable open-drain N-channel switch, enabling individual on/off control and state sensing of nodes via its unique 64-bit ROM. Each DS2405Z/T&R responds only to Match ROM commands targeting its specific ID, allowing independent PIO toggling on a shared bus without affecting other devices. Its parasitic power architecture eliminates the need for a dedicated V_CC connection, making DS2405Z/T&R ideal for distributed, low-wiring-count deployments.

Does the DS2405Z/T&R require an external power supply?

No, the DS2405Z/T&R operates exclusively on parasitic power harvested from the 1-Wire DATA line - no external V_CC or ground-referenced supply is needed. Internal capacitance stores energy during high bus periods and sustains operation during low phases. This design eliminates power routing complexity and makes DS2405Z/T&R suitable for battery-free or energy-harvesting endpoints where minimizing connections is critical.

How does the DS2405Z/T&R ensure unique device identification?

The DS2405Z/T&R contains a factory-lasered 64-bit ROM comprising an 8-bit family code (05h), a unique 48-bit serial number, and an 8-bit CRC - all permanently programmed and tested. No two DS2405Z/T&R units share the same ROM, guaranteeing absolute identity. The CRC validates integrity during ROM reads, and the family code directs the bus master to apply correct communication protocols - ensuring DS2405Z/T&R is never misidentified as another 1-Wire device type.

What is the maximum sink current capability of the DS2405Z/T&R's PIO pin?

The DS2405Z/T&R PIO pin provides ≥4mA sink current at a maximum output voltage (V_OL) of 0.4V, verified across the full operating range (–40°C to +85°C, 2.8V to 6.0V). This specification allows DS2405Z/T&R to directly drive common indicator LEDs, small relays, or optocoupler inputs without external buffering. The value is measured under load conditions defined in the DC Electrical Characteristics table and reflects real-world performance in production units.

Can multiple DS2405Z/T&R devices share the same 1-Wire bus?

Yes, multiple DS2405Z/T&R devices can coexist on a single 1-Wire bus using standard multidrop topology. The embedded search algorithm enables the bus master to discover all DS2405Z/T&R ROM IDs, then selectively address individual units via Match ROM commands. Each DS2405Z/T&R operates independently - toggling or reading its PIO state without interfering with others. This capability is fundamental to MicroLAN architecture and is validated in the DS2405Z/T&R datasheet's transaction sequence diagrams and timing specifications.