Analog Devices Inc./Maxim Integrated MAX6324GUT46

Overview

MAX6324GUT46 from Maxim Integrated is an open-drain microprocessor supervisory circuit with windowed (min/max) watchdog, 4.63V ±2.5% reset threshold, guaranteed RESET assertion down to VCC = +1.2V, and 1ms WDPO fault pulse width. It monitors power integrity and processor timing in automotive engine control units requiring fail-safe reset and dual-fault detection.

For engineers reviewing the MAX6324GUT46 datasheet, MAX6324GUT46 pinout, MAX6324GUT46 application, or MAX6324GUT46 equivalent, this device delivers precision voltage supervision, factory-trimmed watchdog timing windows, manual reset debouncing, low-power operation (23µA typ), and extended temperature support (–40°C to +125°C).

Technical Context

The MAX6324GUT46 implements a min/max watchdog architecture that detects both fast timeout faults (WDI falling edges <719ms apart) and slow timeout faults (no WDI edge >1.3s). Its internal comparator guarantees valid RESET output even as VCC decays to +1.2V, enabling robust brownout recovery in safety-critical systems.

It features laser-trimmed reset threshold of 4.63V (±2.5%) and supports open-drain RESET and WDPO outputs-both requiring external pullups-and includes debounced MR input with 1µs minimum pulse width and 100ns glitch immunity. The BiCMOS process ensures stable operation across –40°C to +125°C.

Key Specifications

Pinout & Package

MAX6324GUT46 is housed in a 6-pin SOT23 package (3.0mm × 1.6mm × 1.1mm body, 0.95mm pitch), optimized for space-constrained PCB layouts in automotive and industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324GUT44, MAX6324GUT46 provides higher reset threshold for improved noise margin on +5V rails; compared with TPS3808G33DBVR, it adds critical dual-fault watchdog capability essential for functional safety applications where software timing integrity must be enforced.

Availability

MAX6324GUT46 is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC I/O, medical infusion pumps, and railway signaling systems 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 high integration.

The MAX6323/MAX6324 product line delivers microprocessor supervision with windowed watchdog functionality specifically engineered for safety-critical embedded systems where deterministic software execution and robust power monitoring are mandatory.

FAQ

What is the exact reset threshold voltage of MAX6324GUT46 and its tolerance?

The MAX6324GUT46 has a factory-laser-trimmed reset threshold of 4.63V with ±2.5% accuracy over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Threshold Range table of the official datasheet and applies specifically to the "46" suffix variant. The MAX6324GUT46 uses this threshold to assert RESET when VCC falls below 4.63V and hold it asserted until VCC rises above that level for at least 100ms.

Does MAX6324GUT46 support windowed (min/max) watchdog functionality, and what are its timeout values?

Yes, MAX6324GUT46 implements true windowed watchdog behavior with two independent timeout periods: fast timeout (tWD1) of up to 719ms and slow timeout (tWD2) of at least 1.3s. These values correspond to the "G" and "H" watchdog suffixes respectively, as defined in the Watchdog Timeout table. A fast fault occurs if WDI falling edges are closer than 719ms; a slow fault occurs if no WDI edge appears within 1.3s. The MAX6324GUT46 asserts WDPO low for 1ms upon either fault.

What is the output type of the RESET pin on MAX6324GUT46, and how must it be interfaced?

The RESET output of MAX6324GUT46 is open-drain, requiring an external pullup resistor to a valid logic supply (≤+6V). Unlike the push-pull MAX6323 variant, MAX6324GUT46 cannot actively drive high-only sink current when asserted low. A 10kΩ pullup is typical, selected to ensure logic-high recognition while accommodating leakage currents. This configuration enables wired-OR reset buses and level-shifting across supply domains.

Can MAX6324GUT46 operate reliably down to low VCC levels, and what is the minimum functional voltage?

Yes, MAX6324GUT46 guarantees valid RESET output down to VCC = +1.2V, as explicitly stated in the General Description and Electrical Characteristics sections. Below this voltage, the internal circuitry ceases to sink current at RESET, but the device remains functional through the full 1.2V–5.5V operating range. This feature ensures deterministic reset behavior during deep brownout events common in automotive stop-start systems and battery-powered medical devices.

What package type and pin count does MAX6324GUT46 use, and is it RoHS-compliant?

MAX6324GUT46 is supplied in a 6-pin SOT23 package (3.0mm × 1.6mm × 1.1mm), per the Package Information section and top-view pin diagram. The "-T" suffix indicates leaded packaging; lead-free versions are designated with "+T" (e.g., MAX6324GUT46+T) and comply with RoHS Directive 2011/65/EU. Both variants share identical electrical performance and thermal characteristics.