Analog Devices Inc./Maxim Integrated MAX6324AUT23-T

Overview

MAX6324AUT23-T from Maxim Integrated is an open-drain microprocessor supervisory circuit with windowed (min/max) watchdog, 2.32V reset threshold (±2.5%), 100ms reset timeout, and operation from VCC = +1.2V to +5.5V. It monitors power integrity and processor timing in automotive engine control units, industrial PLCs, and medical infusion pumps.

For engineers reviewing the MAX6324AUT23-T datasheet, MAX6324AUT23-T pinout, MAX6324AUT23-T application, or MAX6324AUT23-T equivalent, key selection criteria include its factory-trimmed 2.32V reset threshold, A-window fast/slow watchdog timeouts (1.5ms/10ms), guaranteed RESET validity down to VCC = +1.2V, and AEC-Q100-qualified SOT23-6 package for harsh environments.

Technical Context

The MAX6324AUT23-T implements a dual-threshold watchdog that detects both fast faults (WDI falling edges <1.5ms apart) and slow faults (no WDI edge >10ms), with WDPO pulsing low for 1ms on fault detection. Its reset comparator guarantees valid output down to VCC = +1.2V and includes debounced MR input with 1μs minimum pulse width.

This variant uses laser-trimmed thresholds: nominal reset voltage = 2.32V (UT23 suffix), fast watchdog timeout = 1.5ms (A suffix), slow timeout = 10ms (A suffix). It operates across –40°C to +125°C and draws only 23µA typical supply current at 3.3V.

Key Specifications

Pinout & Package

MAX6324AUT23-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), optimized for space-constrained PCB layouts and high-reliability reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324AUT23-T, MAX6324HUT23-T offers extended slow watchdog timing for less time-critical firmware, while TLV803EB23DBVR provides simpler reset-only supervision in a smaller 5-pin package-but neither replicates the precise A-window timing or open-drain WDPO/RESET co-functionality of MAX6324AUT23-T.

Availability

MAX6324AUT23-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 production lifecycles.

Supply support for MAX6324AUT23-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 MAX6324 series targets high-reliability embedded systems requiring simultaneous power monitoring and intelligent watchdog supervision-specifically engineered for AEC-Q100 compliance and operation in harsh thermal/electrical environments.

FAQ

What is the exact reset threshold voltage of the MAX6324AUT23-T?

The MAX6324AUT23-T has a factory-laser-trimmed nominal reset threshold of 2.32V with ±2.5% accuracy across –40°C to +125°C. This value is confirmed in the Reset Threshold Range table of the datasheet (UT23 suffix), and measured VTH falls between 2.25V and 2.38V under full temperature and voltage conditions. The MAX6324AUT23-T uses this precise threshold to monitor +2.5V rails without external resistor dividers.

Does the MAX6324AUT23-T support windowed watchdog functionality, and what are its timeout values?

Yes, the MAX6324AUT23-T implements a true min/max (windowed) watchdog with two independent timeout periods: fast timeout = 1.5ms and slow timeout = 10ms (A-window configuration). These values are factory-trimmed and specified in the Watchdog Timeout table. The MAX6324AUT23-T asserts WDPO low for 1ms when WDI pulses occur either faster than 1.5ms or slower than 10ms-enabling detection of both stuck loops and extended stalls.

What is the operating voltage range for the MAX6324AUT23-T, and why is VCC = +1.2V significant?

The MAX6324AUT23-T operates from VCC = +1.2V to +5.5V. The +1.2V lower limit is critical because RESET output remains valid (guaranteed low-state drive) down to this voltage-unlike many supervisors that fail below 1.8V. This ensures deterministic µP reset behavior during deep brownouts. The MAX6324AUT23-T maintains functional reset assertion even as the host system's supply collapses, preventing undefined states in safety-critical applications.

How does the manual reset (MR) input behave on the MAX6324AUT23-T, and what design considerations apply?

The MR input on the MAX6324AUT23-T is active-low, internally pulled up to VCC, and debounced to reject transients <100ns. It requires a minimum 1μs low pulse to assert RESET and clear the watchdog timer. No external pullup or RC network is needed-MR can be left floating or driven directly by a switch. After MR release, RESET remains asserted for ≥100ms. This behavior simplifies front-panel reset implementation and improves noise immunity in industrial environments for the MAX6324AUT23-T.

What package type and pin count does the MAX6324AUT23-T use, and are there layout considerations?

The MAX6324AUT23-T uses a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175) with standard lead-free termination (-T suffix). Key layout requirements include placing a ≥500pF ceramic capacitor between VCC and GND as close as possible to pins 4 and 2, and using 10kΩ pullup resistors on both RESET and WDPO outputs (to ≤+6V). The MAX6324AUT23-T's compact footprint supports high-density routing while maintaining thermal performance up to +125°C ambient.