Analog Devices Inc./Maxim Integrated MAX6323CUT46-T

Overview

MAX6323CUT46-T from Maxim Integrated is a push-pull-output microprocessor supervisory circuit with windowed (min/max) watchdog, 4.63V ±2.5% reset threshold, 300ms slow watchdog timeout, and guaranteed RESET validity down to VCC = +1.2V. It monitors +5.0V power rails in automotive engine control units, industrial PLCs, and medical infusion pumps where deterministic fault detection and brownout immunity are critical.

For engineers reviewing the MAX6323CUT46-T datasheet, MAX6323CUT46-T pinout, MAX6323CUT46-T application, or MAX6323CUT46-T equivalent, key selection criteria include its factory-trimmed 300ms slow watchdog window (C-suffix), 4.63V reset threshold (46-suffix), push-pull RESET output, -40°C to +125°C operation, and SOT23-6 package compatibility with space-constrained embedded control designs.

Technical Context

The MAX6323CUT46-T implements a dual-window watchdog that detects both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >300ms), with WDPO pulsing low for 1ms upon fault detection. Its internal reset comparator guarantees monotonic assertion/deassertion with 20µs response to VCC transients crossing VTH ±100mV.

RESET is push-pull active-low, sourcing up to VCC − 1.5V at 800µA (for 4.75V VCC) and sinking 1.2mA at 0.4V - enabling direct drive of CMOS inputs without external pullup. The debounced MR input requires only ≥1µs low pulse and rejects 100ns glitches, eliminating external RC networks.

Key Specifications

Pinout & Package

MAX6323CUT46-T uses a 6-pin SOT23 package (package code U6+1A, outline 21-0058) with exposed pad not electrically connected. Thermal resistance θJA = 115°C/W on multilayer board enables operation at full temperature range without heatsinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324CUT46-T, the MAX6323CUT46-T eliminates external pullup resistors; compared with TPS3808G33DBVR, it delivers 4.63V precision monitoring and dual-window watchdog - critical for safety-critical 5V embedded control where false resets or undetected hangs are unacceptable.

Availability

MAX6323CUT46-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6323CUT46-T 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 - emphasizing reliability, low power, and AEC-Q100 qualification.

The MAX6323/MAX6324 family targets high-integrity embedded systems requiring deterministic power monitoring and advanced watchdog supervision - specifically engineered for applications where single-point failures must be detected and mitigated without human intervention.

FAQ

What is the exact reset threshold voltage of MAX6323CUT46-T and how is it trimmed?

The MAX6323CUT46-T has a nominal reset threshold of 4.63V with ±2.5% accuracy over -40°C to +125°C, laser-trimmed at wafer sort. This value is confirmed in the Electrical Characteristics table (VTH = 4.50V to 4.75V) and corresponds to the "46" suffix in the part number. The trimming ensures consistent brownout detection across all units without post-assembly calibration.

How does the windowed watchdog in MAX6323CUT46-T differ from standard watchdog timers?

The MAX6323CUT46-T implements a true min/max watchdog: it triggers WDPO on both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >300ms). Unlike single-timer watchdogs, this detects both runaway loops and stalled execution - critical for safety-critical firmware where either condition indicates loss of control.

Can MAX6323CUT46-T operate reliably at VCC = 1.5V, and what happens to RESET output below 1.2V?

Yes, MAX6323CUT46-T operates down to VCC = 1.2V with fully specified RESET behavior. Below 1.2V, the RESET output becomes high-impedance (open-circuit) and no longer sinks current - which is explicitly guaranteed in the datasheet. For applications requiring valid RESET down to 0V, a 100kΩ pulldown resistor on RESET is recommended, though this applies only to push-pull variants like MAX6323CUT46-T.

What is the function of the MR pin on MAX6323CUT46-T and does it require external components?

The MR pin on MAX6323CUT46-T is an active-low manual reset input with internal 50–85kΩ pullup, requiring no external resistor. It asserts RESET for ≥100ms after a ≥1µs low pulse and rejects 100ns noise spikes - enabling direct connection to mechanical switches or logic outputs without debounce circuitry. Leaving MR unconnected defaults to inactive (high) state.

Is MAX6323CUT46-T pin-compatible with other members of the MAX6323/MAX6324 family?

Yes, all MAX6323/MAX6324 variants use identical 6-pin SOT23 packaging and pinout (MR, GND, WDI, VCC, WDPO, RESET). The MAX6323CUT46-T shares the same footprint and connectivity as MAX6324CUT46-T and other suffix combinations - allowing design reuse across reset threshold and watchdog timeout options without PCB changes.