Analog Devices Inc./Maxim Integrated MAX6323AUT29

Overview

MAX6323AUT29 from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, precision reset monitoring at 2.93V ±2.5%, push-pull active-low RESET output, and operation from +1.2V to +5.5V supply. It asserts RESET for ≥100ms after power-up or manual reset, and detects out-of-window WDI pulses via factory-trimmed fast/slow timeout thresholds - used in automotive engine control units requiring fail-safe boot integrity.

For engineers reviewing the MAX6323AUT29 datasheet, MAX6323AUT29 pinout, MAX6323AUT29 application, or MAX6323AUT29 equivalent, this page delivers verified electrical parameters, SOT23-6 pin mapping, watchdog timing behavior (A-window fast timeout = 1.5ms, slow timeout = 10ms), reset threshold accuracy, and real-world design implications for brownout recovery and software-execution fault detection.

Technical Context

The MAX6323AUT29 implements a dual-threshold watchdog that triggers WDPO on either fast faults (WDI falling edges <1.5ms apart) or slow faults (no WDI edge >10ms), with glitch immunity of 100ns on MR and WDI inputs. Its internal reset comparator guarantees valid RESET down to VCC = +1.2V, and the push-pull output drives CMOS loads directly without external pullup.

Reset assertion is synchronized to VCC crossing the 2.93V nominal threshold (±2.5% over −40°C to +125°C), with 20µs response time from VTH+100mV to VTH−100mV. The device uses BiCMOS process (1371 transistors) and supports manual reset deassertion with 1µs minimum pulse width and internal 50–85kΩ MR pullup.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1, outline 21-0058), footprint land pattern 90-0175, RoHS-compliant lead-free (+T) or leaded (−T) option.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324AUT29, the MAX6323AUT29 offers direct-drive reset capability without pullup resistors, simplifying layout in space-constrained automotive modules; versus TPS3808G33DBVR, it provides superior fault coverage via min/max watchdog detection essential for ASIL-B systems.

Availability

MAX6323AUT29 is available at Aetrix Electronics and suitable for automotive engine control, industrial PLCs, and medical infusion pump designs requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6323AUT29 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.

The MAX6323/MAX6324 family targets safety-critical embedded systems needing certified power supervision and deterministic software execution monitoring - especially where AEC-Q100 qualification and windowed watchdog functionality are mandatory.

FAQ

What is the exact reset threshold voltage of MAX6323AUT29 and how stable is it over temperature?

The MAX6323AUT29 has a nominal reset threshold of 2.93V with ±2.5% accuracy over the full operating range of −40°C to +125°C. Typical operating characteristics show normalized threshold variation remains within ±0.2% across temperature, ensuring robust brownout detection in automotive under-hood environments where thermal cycling is severe. This stability is achieved via laser trimming during wafer sort and BiCMOS process matching.

Does MAX6323AUT29 support true windowed watchdog functionality, and what are the factory-trimmed timeout values?

Yes, MAX6323AUT29 implements true min/max (windowed) watchdog supervision. The "A" suffix denotes fast timeout of 1.5ms (min) and slow timeout of 10ms (min). These values are laser-trimmed at manufacture and guaranteed across temperature - enabling detection of both premature and delayed WDI pulses, unlike single-threshold watchdogs that miss one failure mode.

Can MAX6323AUT29 operate reliably during deep brownout conditions below 2.0V?

Yes, MAX6323AUT29 guarantees valid RESET output down to VCC = +1.2V. Below this voltage, the RESET driver becomes high-impedance, but above 1.2V, it maintains full sink/source capability (VOL ≤ 0.4V @ 1.2mA, VOH ≥ 0.8×VCC). This allows safe, predictable reset assertion even during severe battery sag in automotive start-stop systems.

What is the function of the WDPO pin on MAX6323AUT29 and how should it be interfaced?

The WDPO pin on MAX6323AUT29 is an open-drain watchdog pulse output that asserts low for 1ms (typical) upon detection of either fast or slow WDI timing faults. It requires an external pullup resistor (typically 10kΩ to +3.3V or +5V) and remains inactive while RESET is asserted. WDPO can drive NMI inputs or feed diagnostic logic independently of the reset path - enabling fault logging without system restart.

Is MAX6323AUT29 qualified for automotive applications, and what certifications does it hold?

MAX6323AUT29 is not explicitly AEC-Q100 qualified - only the /V-suffixed variants (e.g., MAX6324HUT44/V+T) carry that certification. However, it shares the same die, BiCMOS process, and −40°C to +125°C operating range, and is widely deployed in automotive subsystems where full AEC-Q100 is not mandated. Its design follows automotive-grade reliability practices including 150°C junction rating and 300°C soldering tolerance.