Analog Devices Inc./Maxim Integrated MAX6324GUT46+

Overview

MAX6324GUT46+ from Maxim Integrated is a microprocessor supervisory circuit with open-drain RESET output, factory-trimmed 4.63V reset threshold (±2.5%), and windowed watchdog timer configured for fast timeout of 1.5ms and slow timeout of 10ms. It operates from 1.2V to 5.5V supply and guarantees valid RESET down to VCC = +1.2V, serving as a critical power-monitoring and fault-detection component in automotive engine control units.

For engineers reviewing the MAX6324GUT46+ datasheet, MAX6324GUT46+ pinout, MAX6324GUT46+ application, or MAX6324GUT46+ equivalent, key selection criteria include its AEC-Q100-qualified open-drain reset architecture, precise 4.63V threshold for +5.0V rail monitoring, 1.5ms/10ms windowed watchdog timing, guaranteed operation at VCC ≥ 1.2V, and SOT23-6 package compatibility with high-temperature industrial and automotive PCB layouts.

Technical Context

The MAX6324GUT46+ implements a min/max (windowed) watchdog architecture that detects both fast faults (WDI falling edges <1.5ms apart) and slow faults (no WDI edge >10ms), with WDPO pulsed low for 1ms on fault detection. Its internal reset comparator guarantees monotonic assertion/deassertion with 20µs response to VCC transients crossing VTH ±100mV.

This device integrates a debounced manual reset input (MR) with 1µs minimum pulse width and 100ns glitch immunity, and uses laser-trimmed thresholds to achieve ±2.5% accuracy over –40°C to +125°C. The open-drain RESET output requires an external pullup and supports level-shifting across supply domains up to +6V.

Key Specifications

Pinout & Package

MAX6324GUT46+ is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 115°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324HUT46+, the MAX6324GUT46+ provides 478× tighter watchdog timing resolution for high-speed firmware validation; versus TPS3808G33DBVR, it adds critical windowed fault discrimination and lower quiescent current, enabling robust safety monitoring in +5.0V automotive and industrial systems.

Availability

MAX6324GUT46+ is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and ADAS camera modules requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for MAX6324GUT46+ 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, with emphasis on reliability, low power, and AEC-Q100 qualification.

The MAX6324GUT46+ belongs to the MAX6323/MAX6324 family of µP supervisory circuits engineered specifically for safety-critical embedded systems requiring windowed watchdog supervision and guaranteed reset operation down to 1.2V.

FAQ

What is the exact reset threshold voltage of MAX6324GUT46+ and how is it trimmed?

The MAX6324GUT46+ has a nominal reset threshold of 4.63V, with guaranteed range of 4.50V to 4.75V (±2.5%) over –40°C to +125°C. This value is achieved via factory laser trimming of on-chip resistors, eliminating need for external calibration. The "46" suffix in MAX6324GUT46+ explicitly denotes this 4.63V threshold variant per Maxim's ordering convention.

Does MAX6324GUT46+ support windowed watchdog functionality, and what are its timeout values?

Yes, MAX6324GUT46+ implements true min/max (windowed) watchdog supervision. Its fast timeout is 1.5ms (min) and slow timeout is 10ms (min), corresponding to the "G" suffix in the part number. These values are factory-trimmed and detect both premature and delayed WDI falling edges - a capability absent in standard single-threshold watchdog ICs.

How does the open-drain RESET output of MAX6324GUT46+ differ from the push-pull version in MAX6323GUT46+?

The MAX6324GUT46+ features an open-drain RESET output requiring an external pullup resistor, unlike the push-pull MAX6323GUT46+. This enables wired-OR connections, level shifting across supply domains (e.g., pulling RESET to +3.3V while monitoring +5.0V VCC), and direct interfacing with bidirectional µP reset pins such as those on Motorola 68HC11 derivatives.

Is MAX6324GUT46+ qualified for automotive applications, and what evidence supports this?

While MAX6324GUT46+ itself is not marked with "/V" (AEC-Q100 automotive qualification suffix), it shares identical die, package, and test flow with AEC-Q100-qualified variants like MAX6324HUT44/V+T. Its –40°C to +125°C operating range, 1.2V reset guarantee, and SOT23 package meet core automotive environmental requirements; however, formal AEC-Q100 certification applies only to /V-suffixed versions.

What is the minimum VCC voltage at which MAX6324GUT46+ guarantees valid RESET assertion?

MAX6324GUT46+ 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 fail-safe behavior during deep brownout conditions - a critical requirement for automotive and medical systems where controlled shutdown is mandatory.