Analog Devices Inc./Maxim Integrated MAX6323AUT46

Overview

MAX6323AUT46 from Maxim Integrated is a push-pull output microprocessor supervisory circuit with windowed (min/max) watchdog, 4.63V ±2.5% reset threshold, 100ms minimum reset timeout, and operation from 1.2V to 5.5V supply. It monitors power integrity and processor timing in automotive engine control units, industrial PLCs, and medical infusion pumps.

For engineers reviewing the MAX6323AUT46 datasheet, MAX6323AUT46 pinout, MAX6323AUT46 application, or MAX6323AUT46 equivalent, this page delivers verified electrical parameters, SOT23-6 terminal mapping, factory-trimmed watchdog timing options (A–H), and AEC-Q100-relevant design guidance for brownout detection, manual reset debouncing, and fault-triggered WDPO pulse generation.

Technical Context

The MAX6323AUT46 implements a dual-window watchdog architecture: fast timeout (tWD1 = 1.5ms min) detects premature WDI pulses, while slow timeout (tWD2 = 10ms min) catches missed pulses. Its internal reset comparator guarantees valid RESET assertion down to VCC = +1.2V, enabling reliable power-down sequencing.

It features a debounced manual reset input (MR) with 1µs minimum pulse width and 100ns glitch immunity, plus an open-drain WDPO output pulsed low for 1ms upon fault detection. The push-pull RESET output drives logic directly without external pullup, supporting systems requiring deterministic reset drive strength.

Key Specifications

Pinout & Package

MAX6323AUT46 is housed in a 6-pin SOT23 package (package code U6-1), footprint-compatible with JEDEC MO-178AB, suitable for high-density automotive and industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324AUT46, the MAX6323AUT46 provides stronger reset drive capability without external components, while TPS3808G33DBVR offers lower quiescent current but omits windowed watchdog functionality essential for functional safety compliance.

Availability

MAX6323AUT46 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6323AUT46 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 and parametric accuracy.

The MAX6323/MAX6324 product line delivers AEC-Q100-qualified supervisory circuits with factory-trimmed voltage thresholds and windowed watchdog timers for functional safety-critical embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6323AUT46 and how is it trimmed?

The MAX6323AUT46 has a nominal reset threshold of 4.63V with ±2.5% accuracy over -40°C to +125°C. This value is laser-trimmed at wafer test and guaranteed by design - no external components or calibration are needed. The "46" suffix explicitly denotes the 4.63V option per Maxim's Reset Threshold Range table, and the device maintains this accuracy across its full operating temperature range.

Does MAX6323AUT46 support operation below 1.8V, and what happens to RESET output at low VCC?

Yes, MAX6323AUT46 operates down to VCC = +1.2V and guarantees valid RESET assertion throughout that range. Below +1.2V, the RESET output becomes high-impedance (open-circuit) - it stops sinking current but remains logically asserted due to external pullup or system design. This behavior ensures safe shutdown without floating reset lines in battery-powered or brownout scenarios.

How does the windowed watchdog in MAX6323AUT46 differ from standard watchdog timers?

The MAX6323AUT46 implements true min/max windowing: it triggers WDPO on both fast faults (WDI falling edges closer than tWD1 = 1.5ms) and slow faults (no WDI edge longer than tWD2 = 10ms). Unlike single-timer watchdogs, this prevents false timeouts from clock jitter while reliably catching software hangs - critical for ISO 26262 ASIL-B systems where timing predictability is mandatory.

Can MAX6323AUT46 be used with a 3.3V microcontroller, and what interface considerations apply?

Yes, MAX6323AUT46 supports 3.3V systems: its VCC range includes 3.3V, and its push-pull RESET output drives 3.3V CMOS inputs directly. However, the 4.63V reset threshold means it monitors a separate 5V rail - use it to supervise the 5V supply feeding level shifters or peripherals, not the 3.3V core logic. For 3.3V rail monitoring, select MAX6323UT31 (3.08V threshold) instead.

What is the purpose of the WDPO output, and how should it be connected in a system?

The WDPO output of MAX6323AUT46 pulses low for 1ms upon detecting any watchdog fault - fast or slow - providing an independent fault signal separate from RESET. Connect WDPO to a non-maskable interrupt (NMI) input to log errors before reset, or loop it back to MR (via RC filter) to force a full 100ms reset sequence. WDPO is open-drain and requires a pullup resistor to any supply ≤+6V.