Analog Devices Inc./Maxim Integrated MAX6730UTRD3+T

Overview

MAX6730UTRD3+T from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low open-drain reset output, factory-set 4.375V VCC1 reset threshold, 140ms–280ms reset timeout (D3), watchdog timer with 54s startup delay and 1.68s normal mode timeout, and manual reset input - designed for reliable power-on reset and brownout detection in embedded systems.

For engineers reviewing the MAX6730UTRD3+T datasheet, MAX6730UTRD3+T pinout, MAX6730UTRD3+T application, or MAX6730UTRD3+T equivalent, this device delivers deterministic reset assertion under VCC1 undervoltage, robust glitch immunity, low 14μA supply current, and SOT23-6 footprint compatibility for space-constrained industrial and telecom designs.

Technical Context

The MAX6730UTRD3+T integrates a precision voltage comparator for VCC1 monitoring (±1.25% threshold accuracy), a monostable reset timeout circuit with six selectable delays (D3 = 140–280ms), and an independent dual-mode watchdog timer - featuring a 54s initial startup period to accommodate system boot and a 1.68s standard timeout for runtime fault detection. It operates across -40°C to +85°C with guaranteed reset validity down to VCC1 = +0.8V.

Its architecture supports direct interfacing with bidirectional μP reset pins via open-drain RST (with external pullup), includes a 50kΩ internal MR pullup, and rejects short VCC transients via hysteresis and timing-based filtering - eliminating need for external RC networks in most applications.

Key Specifications

Pinout & Package

SOT23-6 package (6-pin, 1.6mm × 2.9mm, 0.95mm height), surface-mount, RoHS-compliant lead(Pb)-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisor applications.

Compared with MAX6730UTRD3+T, MAX6731UTRD3+T offers simplified drive but sacrifices bus flexibility, while TPS3808G33DBVR reduces cost and current at the expense of configurability and fault-detection depth - making MAX6730UTRD3+T optimal for multi-feature, multi-rail industrial supervision.

Availability

MAX6730UTRD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, embedded medical monitors, and automotive infotainment modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6730UTRD3+T 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6730–MAX6735 family was designed specifically for robust, low-power microprocessor supervision in multivoltage embedded systems - emphasizing glitch immunity, precise threshold accuracy, and independent watchdog functionality.

FAQ

What is the exact reset threshold voltage for MAX6730UTRD3+T?

The MAX6730UTRD3+T has a factory-set VCC1 reset threshold of 4.375V (nominal), with guaranteed tolerance of ±1.25% over -40°C to +85°C. This value corresponds to the "MR" suffix in the ordering code and applies exclusively to the primary supply monitor - no secondary or adjustable thresholds are present in this variant.

Does MAX6730UTRD3+T include a watchdog timer, and what are its timing parameters?

Yes, MAX6730UTRD3+T includes a dual-mode watchdog timer: a 54s minimum startup delay after reset to allow system initialization, followed by a 1.68s minimum normal-mode timeout. The watchdog output (WDO) is active-low and open-drain, asserting low if no edge is detected on WDI within the timeout window.

What package type and pin count does MAX6730UTRD3+T use?

MAX6730UTRD3+T is housed in a 6-pin SOT23 package (1.6mm × 2.9mm footprint, 0.95mm height), with pinout standardized across the MAX6730–MAX6735 family: Pin 1 = RST, Pin 2 = GND, Pin 3 = WDO, Pin 4 = VCC1, Pin 5 = WDI, Pin 6 = MR.

Is manual reset supported on MAX6730UTRD3+T, and how is it implemented?

Yes, MAX6730UTRD3+T includes an active-low manual reset input (MR) on Pin 6. It features a 50kΩ internal pullup to VCC1, accepts TTL/CMOS logic levels, requires a minimum 1μs pulse width, and holds RST asserted for the full D3 timeout period (140–280ms) after MR is released.

What is the supply current consumption of MAX6730UTRD3+T at typical operating conditions?

MAX6730UTRD3+T draws 14μA typical supply current at +3.6V and +25°C, with maximum of 39μA across -40°C to +85°C. This ultra-low ICC enables deployment in battery-backed systems and energy-constrained edge devices without compromising supervision reliability.