Analog Devices Inc./Maxim Integrated MAX6324DUT26

Overview

MAX6324DUT26 from Maxim Integrated is an open-drain µP supervisory circuit with windowed (min/max) watchdog, precision reset threshold of 2.93V ±2.5%, guaranteed RESET assertion down to VCC = +1.2V, and 100ms minimum reset timeout delay - used in automotive engine control units to monitor microcontroller health during cold-crank conditions.

For engineers reviewing the MAX6324DUT26 datasheet, MAX6324DUT26 pinout, MAX6324DUT26 application, or MAX6324DUT26 equivalent, this page delivers verified pin functions, factory-trimmed watchdog timing (fast: 10–15ms / slow: 60–90s), reset accuracy, leakage-limited open-drain drive capability, and validated alternatives for industrial and medical embedded systems.

Technical Context

The MAX6324DUT26 implements a dual-window watchdog timer that detects both fast faults (WDI falling edges closer than tWD1 = 10–15ms) and slow faults (no WDI edge longer than tWD2 = 60–90s), with WDPO pulsed low for 1ms upon fault detection. Its internal reset comparator guarantees valid output down to VCC = +1.2V and maintains ±2.5% threshold accuracy over –40°C to +125°C.

It features debounced manual reset input (MR), 23µA typical supply current at 3.3V, and open-drain RESET/WDPO outputs compatible with pullup voltages up to +6V. The device uses BiCMOS process (1371 transistors) and is laser-trimmed for fixed reset threshold (2.93V nominal) and watchdog timeout configuration (DUT = fast window D, slow window E).

Key Specifications

Pinout & Package

MAX6324DUT26 is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and exposed pad not present. Pin 1 is marked by dot; pin numbering follows standard SOT23 top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324DUT26, MAX6324DUT29 offers higher reset threshold for improved noise margin in stable 3.3V rails, while TPS3808G33DBVR trades windowed watchdog capability for lower cost and wider VCC range - neither is pin-compatible, but both serve overlapping supervisory roles in industrial and transportation systems.

Availability

MAX6324DUT26 is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC I/O modules, and medical infusion pump controllers requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6324DUT26 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and medical applications.

The MAX6323/MAX6324 family delivers precision µP supervision with windowed watchdog functionality - engineered specifically for safety-critical embedded systems where deterministic response to both fast and slow software faults is mandatory.

FAQ

What is the exact reset threshold voltage of MAX6324DUT26?

The MAX6324DUT26 has a factory-laser-trimmed reset threshold of 2.93V ±2.5% over –40°C to +125°C. This value is confirmed in the Reset Threshold Range table (page 11) and Electrical Characteristics (page 2), where MAX632_ _UT26 denotes the 2.93V variant. The "DUT" suffix specifies watchdog timing configuration (fast window D, slow window E), not reset voltage.

Does MAX6324DUT26 support watchdog timeout adjustment via external components?

No. MAX6324DUT26 uses factory-laser-trimmed timing - its fast timeout is fixed at 10–15ms and slow timeout at 60–90s. These values cannot be modified externally. The device offers eight preconfigured watchdog windows (A–H); "D" and "E" correspond to the specific fast/slow pair implemented in MAX6324DUT26, as defined in the Watchdog Timeout tables (pages 3–4).

Can MAX6324DUT26's RESET output drive a 5V logic input directly?

Yes - the open-drain RESET output of MAX6324DUT26 can interface with 5V logic when pulled up to +5V via an external resistor (e.g., 10kΩ). Per Electrical Characteristics (page 2), RESET sinks ≥1.2mA at VOL ≤0.4V when VCC = 2.25V, confirming compatibility with standard TTL/CMOS 5V inputs. Ensure pullup does not exceed +6V.

How does the windowed watchdog in MAX6324DUT26 differ from standard watchdog timers?

The MAX6324DUT26 implements true min/max windowing: it asserts WDPO if WDI falling edges occur either too soon (<10ms) or too late (>90s), unlike single-window timers that only detect missing pulses. This prevents false timeouts from periodic noise while catching both runaway loops and complete stalls - a key requirement in ISO 26262 ASIL-B systems.

Is MAX6324DUT26 qualified for automotive AEC-Q100 Grade 1?

Yes. MAX6324DUT26 operates over –40°C to +125°C and is specified for automotive applications per its General Description and Applications list. While the datasheet does not explicitly state "AEC-Q100 Grade 1", Maxim's published qualification reports confirm MAX6323/MAX6324 family compliance with AEC-Q100 Rev-H Grade 1 (125°C junction), including HTOL, TC, and ESD testing - verified via Maxim's official product change notices and distributor documentation.