Analog Devices Inc./Maxim Integrated MAX6320PUK29DY-T

Overview

MAX6320PUK29DY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with open-drain active-low reset output, 2.93V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity and provides manual reset input (MR), watchdog input (WDI), and brownout protection for embedded control systems operating from 1.0V to 5.5V.

For engineers reviewing the MAX6320PUK29DY-T datasheet, MAX6320PUK29DY-T pinout, MAX6320PUK29DY-T application, or MAX6320PUK29DY-T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), open-drain output compatible with mixed-voltage reset buses up to 6V, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6320PUK29DY-T implements a voltage-monitoring architecture with a factory-laser-trimmed resistor divider setting the precise 2.93V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +125°C). Its reset generator asserts active-low RESET when VCC falls below VRST or MR is pulled low, holding assertion for ≥140ms after VCC rises above threshold or MR release.

It integrates a watchdog timer cleared by edges on WDI (rising or falling); failure to service WDI within 1.6s (typ) triggers reset. The open-drain RESET output requires an external pullup (e.g., 10kΩ) to any supply ≤6V and sinks ≥1.2mA at VCC ≥2.7V while maintaining VOL ≤0.3V.

Key Specifications

Pinout & Package

MAX6320PUK29DY-T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), optimized for space-constrained PCB layouts with 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 MAX6320PUK29DY-T, MAX6320PUK29CY-T offers identical supervision functionality with minor packaging differentiation, whereas TPS3808G18DBVR omits watchdog capability and open-drain output-making it unsuitable for multi-source reset buses or software fault detection.

Availability

MAX6320PUK29DY-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6320PUK29DY-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 communications applications.

The MAX6316–MAX6322 family delivers highly integrated μP supervisory circuits with factory-trimmed thresholds, configurable reset/watchdog timing, and robust ESD/transient immunity for mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6320PUK29DY-T?

The MAX6320PUK29DY-T features a factory-laser-trimmed reset threshold of 2.93V, with tolerance of ±1.5% at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is confirmed in Table 1 and the Selector Guide of the official datasheet, and corresponds to the "29" suffix in the part number.

Does MAX6320PUK29DY-T include a watchdog timer?

Yes, MAX6320PUK29DY-T includes a watchdog timer with a typical timeout period of 1.6 seconds. The timer is cleared by any edge (rising or falling) on the WDI pin and asserts reset if unserviced for the full timeout duration. Watchdog functionality is enabled by default and disabled only when WDI is left unconnected or three-stated.

What type of reset output does MAX6320PUK29DY-T provide?

MAX6320PUK29DY-T provides an active-low open-drain reset output on Pin 1. This requires an external pullup resistor (typically 10kΩ) to a voltage rail up to 6V. The output sinks ≥1.2mA at VCC ≥2.7V while maintaining VOL ≤0.3V, enabling flexible interfacing with mixed-voltage systems.

Is MAX6320PUK29DY-T qualified for automotive applications?

Yes, MAX6320PUK29DY-T is AEC-Q100 qualified, meeting Grade 1 temperature requirements (-40°C to +125°C) and rigorous stress testing for automotive use. It is suitable for body electronics, infotainment, and ADAS subsystems where reliability under thermal and electrical stress is mandatory.

What is the minimum supply voltage at which MAX6320PUK29DY-T guarantees valid reset output?

MAX6320PUK29DY-T guarantees valid reset output down to VCC = 1.0V. Below this, the internal circuitry cannot maintain defined logic states on RESET or MR. This specification ensures robust brownout response in battery-powered systems experiencing deep discharge.