Analog Devices Inc./Maxim Integrated MAX6324AUT46

Overview

MAX6324AUT46 from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, open-drain RESET output, and factory-trimmed 4.63V reset threshold (±2.5% accuracy). It monitors VCC down to +1.2V, asserts RESET low on brownout or MR activation, and pulses WDPO low for 1ms upon fast/slow watchdog timeout - used in automotive engine control units for fault detection during ECU boot and runtime.

For engineers reviewing the MAX6324AUT46 datasheet, MAX6324AUT46 pinout, MAX6324AUT46 application, or MAX6324AUT46 equivalent, this page delivers verified electrical specs, SOT23-6 terminal roles, temperature-stable reset timing, and real-world integration guidance for safety-critical embedded systems.

Technical Context

The MAX6324AUT46 implements a dual-window watchdog that detects both premature (fast fault) and delayed (slow fault) WDI falling edges relative to laser-trimmed tWD1 (719ms max) and tWD2 (1.3s min) thresholds. Its internal comparator guarantees valid RESET assertion even as VCC decays to +1.2V, enabling fail-safe behavior during power collapse.

RESET is open-drain with guaranteed 0.4V VOL at 3.2mA sink, requiring external pullup; WDPO is also open-drain, pulsed low for 1ms on fault detection, and remains inactive while RESET is asserted. The device operates across -40°C to +125°C with ±2.5% reset threshold accuracy over full temperature range.

Key Specifications

Pinout & Package

MAX6324AUT46 is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), footprint-compatible with industry-standard SOT23 layouts and reflow-solderable per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324AUT44, MAX6324AUT46 provides higher reset threshold for tighter alignment with +5.0V supplies; compared with TPS3808G33DBVR, it adds windowed watchdog capability and open-drain flexibility but requires external pullups and supports higher operating voltage.

Availability

MAX6324AUT46 is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC I/O, medical infusion pump controllers, and railway signaling interface boards requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6324AUT46 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 was engineered specifically for safety-critical embedded systems requiring robust power monitoring and advanced windowed watchdog supervision - targeting ASIL-B and SIL-2 functional safety compliance.

FAQ

What is the exact reset threshold voltage of MAX6324AUT46 and how is it trimmed?

The MAX6324AUT46 has a nominal reset threshold of 4.63V with ±2.5% accuracy over -40°C to +125°C. This value is achieved via factory laser trimming of on-chip resistors - no external components or calibration are required. The "46" suffix in MAX6324AUT46 directly references the 4.63V threshold bin per Maxim's standard ordering nomenclature.

Does MAX6324AUT46 support windowed watchdog functionality, and what are its timeout values?

Yes, MAX6324AUT46 implements true min/max (windowed) watchdog supervision. Its fast timeout (tWD1) is 719ms maximum, and slow timeout (tWD2) is 1.3s minimum - both factory-laser-trimmed. A WDPO pulse is generated if WDI falling edges occur either too soon (<719ms apart) or too late (>1.3s apart).

Can MAX6324AUT46 operate reliably down to VCC = +1.2V, and what happens to RESET below that?

Yes, MAX6324AUT46 guarantees valid RESET assertion down to VCC = +1.2V. Below +1.2V, the internal output stage cannot sink current - RESET becomes high-impedance. This is intentional design behavior: most µPs are nonfunctional below +1.2V, so forced RESET assertion is unnecessary and could interfere with controlled power-down sequences.

What is the function of the WDPO pin on MAX6324AUT46, and how should it be interfaced?

WDPO is an open-drain watchdog pulse output that goes low for 1ms upon detection of a fast or slow watchdog fault. It must be pulled up externally to any supply ≤+6V. WDPO is only active when RESET is high - ensuring fault signaling does not conflict with power-on reset sequences. It can drive NMI inputs or external latches for autonomous fault response.

Is MAX6324AUT46 pin-compatible with other devices in the MAX6323/MAX6324 family?

Yes, all MAX6323/MAX6324 variants - including MAX6324AUT46 - use identical 6-pin SOT23-6 packaging and pinout. The only differences are factory-trimmed reset thresholds (e.g., UT44 = 4.50V, UT46 = 4.63V) and watchdog timeout bins (e.g., A–H suffixes). No PCB redesign is needed when substituting within the same package variant.