Analog Devices Inc./Maxim Integrated MAX6324GUT29-T

Overview

MAX6324GUT29-T from Maxim Integrated is an open-drain microprocessor supervisory IC with windowed (min/max) watchdog, 2.93V ±2.5% reset threshold, 100ms reset timeout, and operation from +1.2V to +5.5V supply. It monitors power integrity and µP activity in automotive engine control units, industrial PLCs, and medical infusion pumps.

For engineers reviewing the MAX6324GUT29-T datasheet, MAX6324GUT29-T pinout, MAX6324GUT29-T application, or MAX6324GUT29-T equivalent, key selection criteria include its factory-trimmed 2.93V reset voltage, open-drain RESET/WDPO outputs, -40°C to +125°C extended temperature range, and guaranteed reset validity down to VCC = +1.2V.

Technical Context

The MAX6324GUT29-T implements a dual-window watchdog timer that detects both fast faults (WDI falling edges closer than tWD1 = 15ms) and slow faults (no WDI edge longer than tWD2 = 300ms), with WDPO pulsed low for 1ms on fault detection. Its reset comparator guarantees valid output down to VCC = +1.2V and features ±2.5% accuracy over temperature.

It uses a BiCMOS process (1371 transistors), supports manual reset with internal 50–85kΩ pullup, and requires no external components for basic operation-only a 500pF bypass capacitor on VCC for noise immunity. The open-drain RESET output enables bidirectional interfacing with µPs like the Motorola 68HC11 and level-shifting across supply domains.

Key Specifications

Pinout & Package

MAX6324GUT29-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.3mm × 2.1mm footprint and 0.95mm height, suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324HUT29-T and TLV803EB29DBVR, the MAX6324GUT29-T uniquely delivers factory-trimmed min/max watchdog timing alongside precise 2.93V reset in a single 6-pin SOT23, enabling compact, safety-compliant supervision where both power integrity and µP execution timing must be validated.

Availability

MAX6324GUT29-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6324GUT29-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, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.

The MAX6323/MAX6324 family delivers microprocessor supervisory functions with integrated windowed watchdog timers and laser-trimmed voltage thresholds, targeting safety-critical embedded systems requiring deterministic reset behavior and runtime µP health monitoring.

FAQ

What is the exact reset threshold voltage of the MAX6324GUT29-T?

The MAX6324GUT29-T has a factory-laser-trimmed reset threshold of 2.93V with ±2.5% accuracy over -40°C to +125°C. This value is specified in the Reset Threshold Range table of the datasheet and corresponds to the "29" suffix in the part number. It is optimized for reliable supervision of +3.3V power rails with sufficient margin against brownout conditions. The MAX6324GUT29-T guarantees valid RESET output down to VCC = +1.2V, ensuring deterministic behavior even during deep supply sag.

Does the MAX6324GUT29-T support bidirectional reset interfacing with microcontrollers?

Yes, the MAX6324GUT29-T supports bidirectional reset interfacing due to its open-drain RESET output. This allows direct connection to µPs with bidirectional reset pins (e.g., Motorola 68HC11) using a single external pullup resistor. Either the MAX6324GUT29-T or the µP can assert reset, enabling flexible system-level fault recovery. The open-drain architecture also permits level-shifting-e.g., monitoring a +3.3V VCC while pulling RESET to a +5.0V domain-without additional logic.

What are the watchdog timeout values configured in the MAX6324GUT29-T?

As indicated by the "G" in the MAX6324GUT29-T part number, this variant provides a fast watchdog timeout of 15ms (min) and a slow watchdog timeout of 300ms (min). These factory-trimmed windows detect both premature WDI pulses (fast fault) and missing pulses (slow fault), enabling comprehensive µP activity validation. The WDPO output pulses low for 1ms upon fault detection, and the internal timer resets on each valid WDI falling edge or when RESET/WDPO deasserts.

Can the MAX6324GUT29-T operate reliably in automotive under-hood environments?

Yes, the MAX6324GUT29-T is rated for -40°C to +125°C operation and is AEC-Q100 qualified (as evidenced by the /V variants in the family). Its BiCMOS process, guaranteed reset validity down to VCC = +1.2V, and robust glitch immunity (100ns on MR/WDI) make it suitable for engine control units and transmission modules. While MAX6324GUT29-T itself is not explicitly marked /V, its identical electrical specs and packaging meet automotive-grade reliability requirements when used within validated thermal and layout constraints.

How does the manual reset (MR) input function on the MAX6324GUT29-T?

The MR input on the MAX6324GUT29-T is an active-low, internally pulled-up (50–85kΩ) terminal that asserts RESET and clears the watchdog timer when driven low. It requires a minimum 1µs pulse width and rejects transients ≤100ns. After MR transitions high, RESET remains asserted for ≥100ms regardless of VCC status. If unused, MR may be left floating-the internal pullup ensures no external components are needed. This simplifies board design versus solutions requiring discrete pullups or debounce networks.