Analog Devices Inc./Maxim Integrated MAX6320PUK46BY/V+T

Overview

MAX6320PUK46BY/V+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 4.63V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply voltage, accepts manual reset (MR) input, and services watchdog input (WDI) to detect microprocessor lockup in embedded control systems.

For engineers reviewing the MAX6320PUK46BY/V+T datasheet, MAX6320PUK46BY/V+T pinout, MAX6320PUK46BY/V+T application, or MAX6320PUK46BY/V+T equivalent, key selection criteria include its AEC-Q100 qualification, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, and compatibility with multi-supply reset bus configurations via external pullup.

Technical Context

The MAX6320PUK46BY/V+T implements a precision voltage monitor with factory-trimmed 4.63V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout (C-suffix), and 1.6s typical watchdog timeout (Y-suffix). Its open-drain RESET output requires an external pullup resistor and supports interfacing with multiple supply domains up to 6V.

It features manual reset (MR) with internal 52kΩ pullup and glitch rejection of 100ns, watchdog input (WDI) that clears on any edge transition (≥50ns pulse width), and operates across 1.0V to 5.5V supply range with supply current as low as 5µA at 3.6V. Guaranteed operation down to VCC = 1V ensures robust brownout detection.

Key Specifications

Pinout & Package

MAX6320PUK46BY/V+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated assembly and thermal performance (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 MAX6320PUK46BY/V+T, MAX6320PUK46CY-T offers identical electrical behavior but lacks automotive qualification and extended temperature support, while TLV809E46DBVR trades watchdog/MR functionality and adjustable timeout for minimal size and cost-making it suitable only for simpler supervision tasks.

Availability

MAX6320PUK46BY/V+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, portable medical monitors, and battery-powered smart sensor nodes requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.

Supply support for MAX6320PUK46BY/V+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6316–MAX6322 family was designed specifically for robust microprocessor supervision in harsh environments-delivering precise voltage monitoring, configurable reset timing, watchdog protection, and manual reset capability in miniature SOT23 packages.

FAQ

What is the exact reset threshold voltage of MAX6320PUK46BY/V+T and how tightly is it specified?

The MAX6320PUK46BY/V+T has a factory-trimmed nominal reset threshold of 4.63V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). At +25°C, the specification tightens to ±1.5%, yielding a range of 4.561V to 4.699V. This precision eliminates need for external resistor dividers and ensures consistent brownout detection across automotive and industrial environments.

Does MAX6320PUK46BY/V+T support watchdog functionality, and what is its timeout period?

Yes, MAX6320PUK46BY/V+T includes a watchdog timer with a typical timeout period of 1.6 seconds (Y-suffix), corresponding to the MAX63__Y-T configuration. The watchdog clears on any rising or falling edge at the WDI pin (minimum pulse width 50ns) and asserts reset if no transition occurs within the timeout window. This protects against firmware lockup in safety-critical embedded systems.

What package type and RoHS status does MAX6320PUK46BY/V+T use?

MAX6320PUK46BY/V+T is supplied in a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174) with RoHS-compliant lead-free finish indicated by the "+" in the "+T" suffix. The "/V" denotes AEC-Q100 qualification, and the "U" in "UK" confirms SOT23 packaging. Thermal resistance is 255.9°C/W (junction-to-ambient, multilayer board).

How does the open-drain RESET output of MAX6320PUK46BY/V+T interface with systems using multiple supply voltages?

The open-drain RESET output of MAX6320PUK46BY/V+T allows connection of an external pullup resistor to any voltage rail up to 6V-including 3.3V, 5V, or auxiliary supplies-enabling coordinated reset signaling across mixed-voltage subsystems. This avoids level shifters and simplifies design in systems where MCU, peripherals, and sensors operate at different logic levels.

Is MAX6320PUK46BY/V+T compatible with manual reset switches, and what design considerations apply?

Yes, MAX6320PUK46BY/V+T includes a dedicated MR (manual reset) input with internal 52kΩ pullup to VCC, allowing direct connection of a normally-open momentary switch to ground-no external components required. The input rejects 100ns glitches and accepts TTL/CMOS logic levels; for noise immunity, a 0.1µF capacitor from MR to ground is recommended.