Analog Devices Inc./Maxim Integrated MAX6324GUT46-T

Overview

MAX6324GUT46-T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, open-drain RESET output, and factory-trimmed 4.63V reset threshold (±2.5% accuracy), guaranteed valid down to VCC = +1.2V. It monitors power supply integrity and µP activity in automotive and industrial control systems, asserting RESET on brownout or manual reset and pulsing WDPO on fast/slow watchdog faults.

For engineers reviewing the MAX6324GUT46-T datasheet, MAX6324GUT46-T pinout, MAX6324GUT46-T application, or MAX6324GUT46-T equivalent, key selection criteria include its 6-pin SOT23 package, -40°C to +125°C operation, 100ms minimum reset timeout, 1ms WDPO pulse width, and compatibility with bidirectional µP reset pins via open-drain architecture.

Technical Context

The MAX6324GUT46-T implements a dual-window watchdog timer that detects both fast faults (WDI falling edges closer than tWD1 = 1.5ms min) and slow faults (no WDI edge longer than tWD2 = 10ms max), with WDPO pulsed low for 1ms upon fault detection. Its VCC monitor uses a precision bandgap reference to guarantee ±2.5% reset threshold accuracy across temperature.

RESET is open-drain and requires an external pullup; it remains asserted ≥100ms after VCC rises above 4.63V and MR deasserts. The internal MR pullup (50–85kΩ) enables direct switch connection, and WDI accepts pulses ≥300ns wide with 100ns glitch immunity at VCC = 2.5V.

Key Specifications

Pinout & Package

MAX6324GUT46-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324HUT46-T and TPS3808G33DBVR, the MAX6324GUT46-T uniquely delivers precise 4.63V monitoring combined with sub-2ms fast-fault detection - essential for automotive ECUs and medical devices requiring robust, multi-layered µP supervision.

Availability

MAX6324GUT46-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6324GUT46-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) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and medical applications, emphasizing high reliability and AEC-Q100 qualification.

The MAX6324GUT46-T belongs to the MAX6323/MAX6324 family of µP supervisory circuits engineered specifically for safety-critical embedded systems requiring both power supply monitoring and intelligent, windowed watchdog supervision.

FAQ

What is the exact reset threshold voltage of the MAX6324GUT46-T?

The MAX6324GUT46-T has a nominal reset threshold of 4.63V, with a guaranteed range of 4.50V to 4.75V at -40°C to +125°C. This ±2.5% accuracy is laser-trimmed at wafer sort and ensures reliable brownout detection for +5V systems without external calibration. The "46" suffix in MAX6324GUT46-T explicitly denotes this 4.63V threshold variant.

How does the windowed watchdog function in the MAX6324GUT46-T differ from standard watchdog timers?

The MAX6324GUT46-T implements a true min/max (windowed) watchdog: it detects both fast faults (WDI falling edges closer than 1.5ms) and slow faults (no WDI edge longer than 10ms). Unlike single-timer watchdogs, this prevents false resets during intentional short delays while still catching premature loops or missed interrupts - a critical distinction for real-time firmware validation in the MAX6324GUT46-T.

Can the MAX6324GUT46-T interface directly with a microcontroller that has a bidirectional reset pin?

Yes, the MAX6324GUT46-T's open-drain RESET output enables direct interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11). By connecting RESET to the µP pin with a single pullup resistor, either device can assert reset - the MAX6324GUT46-T during power faults or watchdog events, and the µP itself during software-initiated resets. No level-shifting or additional logic is required.

What is the minimum VCC voltage at which the MAX6324GUT46-T guarantees valid RESET output?

The MAX6324GUT46-T guarantees valid RESET output down to VCC = +1.2V. Below this voltage, the internal output stage ceases sinking current, making RESET indeterminate. This specification ensures deterministic reset behavior during deep brownout conditions - a key reliability feature confirmed in the MAX6324GUT46-T datasheet's Electrical Characteristics table.

Is the MAX6324GUT46-T qualified for automotive applications?

The MAX6324GUT46-T is not explicitly AEC-Q100 qualified - that designation applies only to variants with "/V" suffix (e.g., MAX6324HUT44/V+T). However, it shares the same -40°C to +125°C operating temperature range and robust construction as automotive-grade parts, making it suitable for non-safety-critical automotive subsystems where full qualification is not mandated. Always verify compliance requirements against your specific application.