Analog Devices Inc./Maxim Integrated MAX6320PUK30BX-T

Overview

MAX6320PUK30BX-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, manual reset input, and watchdog timer. It features a factory-trimmed 3.0V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 102ms typical watchdog timeout. It operates from 1.0V to 5.5V supply and is used in battery-powered embedded controllers to ensure reliable power-on initialization and software fault recovery.

For engineers reviewing the MAX6320PUK30BX-T datasheet, MAX6320PUK30BX-T pinout, MAX6320PUK30BX-T application, or MAX6320PUK30BX-T equivalent, key selection criteria include its open-drain reset architecture compatible with mixed-voltage systems, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), and AEC-Q100 qualification for automotive-adjacent industrial use.

Technical Context

The MAX6320PUK30BX-T implements a voltage-monitoring reset generator with integrated watchdog timer and manual reset input. Its reset assertion logic responds to VCC falling below 3.0V (±2.5%), MR low pulse ≥1.5µs, or WDI inactivity beyond 102ms - all triggering an active-low open-drain RESET output requiring external pullup. The watchdog clears on any WDI edge (≥50ns pulse width) and is disabled when WDI is unconnected.

Its open-drain RESET output sinks up to 3.2mA at VCC ≥4.5V (VOL ≤0.4V) and exhibits <1.0µA leakage when deasserted. Internal 52kΩ MR pullup enables direct switch-to-ground connection without external components, and the device guarantees functional operation down to VCC = 1.0V with reset valid through brownout conditions.

Key Specifications

Pinout & Package

MAX6320PUK30BX-T is housed in a 5-pin SOT23 package (package code U5+2A, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 255.9°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6320PUK30BX-T, MAX6320PUK30BY-T offers faster watchdog response but identical supervision core, while TPS3808G30DBVR trades watchdog functionality and open-drain flexibility for ultra-low IQ and simpler reset signaling - making it suitable only for non-watchdog applications where power budget is paramount.

Availability

MAX6320PUK30BX-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, portable medical devices, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX6320PUK30BX-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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.

The MAX6316–MAX6322 family delivers highly integrated μP supervisory circuits targeting space-constrained, reliability-critical embedded systems needing robust power monitoring, manual reset, and software watchdog protection in miniature SOT23 packages.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6320PUK30BX-T?

The MAX6320PUK30BX-T has a factory-trimmed nominal reset threshold of 3.0V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. At +25°C, the threshold is specified as 2.925V (min) to 3.075V (max). This tight tolerance eliminates need for external calibration and ensures consistent power-on behavior across environmental extremes.

Does MAX6320PUK30BX-T require an external pullup resistor on the RESET pin?

Yes, MAX6320PUK30BX-T requires an external pullup resistor on the RESET pin because it features an open-drain output. A 10kΩ resistor pulled to the target logic rail (e.g., 3.3V or 5V) is sufficient in most applications. The device itself does not provide internal pullup; this architecture enables level-shifting and wired-OR reset bus configurations essential in multi-voltage systems.

What is the watchdog timeout period of MAX6320PUK30BX-T and how is it triggered?

The MAX6320PUK30BX-T has a typical watchdog timeout period of 102ms (X-suffix). It is triggered when the WDI pin remains static (neither rising nor falling edge) for longer than this interval. The timer clears on any WDI edge (≥50ns pulse width) and also resets automatically when RESET is asserted. Leaving WDI unconnected disables the watchdog function entirely.

Can MAX6320PUK30BX-T operate reliably during severe supply voltage transients?

Yes, MAX6320PUK30BX-T is specifically designed to reject short negative-going VCC transients: it will not assert reset for pulses as large as 200ns duration at full VCC amplitude, or for 100mV-under-threshold glitches lasting less than 4µs. This immunity prevents false resets in electrically noisy environments such as automotive or industrial motor-control settings.

Is MAX6320PUK30BX-T qualified for automotive applications?

MAX6320PUK30BX-T is AEC-Q100 qualified, confirming compliance with the stress-test requirements for automotive-grade reliability. While not designated with the "/V" automotive suffix (which denotes full PPAP support), its qualification validates suitability for automotive-adjacent applications including body electronics, infotainment power domains, and transportation infrastructure equipment operating within -40°C to +125°C.