Analog Devices Inc./Maxim Integrated MAX6320PUK43CY/V+T

Overview

MAX6320PUK43CY/V+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 4.3V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity and provides manual reset and watchdog functionality for embedded control systems requiring AEC-Q100-qualified supervision.

For engineers reviewing the MAX6320PUK43CY/V+T datasheet, MAX6320PUK43CY/V+T pinout, MAX6320PUK43CY/V+T application, or MAX6320PUK43CY/V+T equivalent, key selection criteria include its automotive-grade qualification, open-drain reset architecture compatible with multi-supply systems, guaranteed reset validity down to VCC = 1V, and immunity to short negative VCC transients.

Technical Context

The MAX6320PUK43CY/V+T integrates a precision voltage detector with ±2.5% threshold tolerance over -40°C to +125°C, a 140ms reset timeout generator, and a 1.6s watchdog timer cleared by WDI edge transitions. Its open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.5V and features <0.4V VOL with 1.0µA leakage.

It includes a manual reset (MR) input with internal 52kΩ pullup, 100ns glitch rejection, and 230ns MR-to-reset propagation delay at VCC = 5V. The WDI input accepts TTL/CMOS logic levels and draws ≤160µA average current when actively driven.

Key Specifications

Pinout & Package

MAX6320PUK43CY/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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6320PUK43CY/V+T, the MAX6320PUK43DZ/V+T offers identical supervision architecture with extended watchdog timing, while TLV809E43DBVR reduces functionality to basic reset generation-making it unsuitable for systems requiring software health monitoring or operator-initiated reset.

Availability

MAX6320PUK43CY/V+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and smart energy meter MCU subsystems requiring stable component supply with AEC-Q100 qualification and long-term lifecycle support.

Supply support for MAX6320PUK43CY/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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6316–MAX6322 family delivers highly integrated, factory-trimmed supervisory circuits targeting space-constrained, high-reliability embedded systems where guaranteed reset behavior across extreme temperatures and supply conditions is mandatory.

FAQ

What is the exact reset threshold voltage of MAX6320PUK43CY/V+T and how is it trimmed?

The MAX6320PUK43CY/V+T has a factory-trimmed nominal reset threshold of 4.30V, with tolerance of ±2.5% over -40°C to +125°C. This value is laser-trimmed during production using internal resistive dividers, as confirmed in Table 1 of the datasheet. The "43" in the part number directly encodes the 4.3V threshold, and the device does not support user adjustment or external programming of this threshold.

Does MAX6320PUK43CY/V+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6320PUK43CY/V+T includes a manual reset (MR) input. The MR pin has an internal 52kΩ pullup to VCC and requires a logic-low pulse ≥1.5µs (over full temperature range) to assert reset. It rejects transients ≤100ns and draws negligible current when left unconnected. Driving MR from a separate supply violates absolute maximum ratings; it must share the same VCC domain.

How does the watchdog function work on MAX6320PUK43CY/V+T, and what is the timeout period?

The MAX6320PUK43CY/V+T watchdog timer has a typical timeout period of 1.6 seconds. It is cleared by any rising or falling edge on the WDI pin. If no edge occurs within 1.6s, RESET is asserted. Leaving WDI unconnected disables the watchdog, as the internal counter services itself at 7/8 of the timeout interval. The WDI input draws ≤160µA when actively driven high.

What is the purpose of the open-drain RESET output on MAX6320PUK43CY/V+T, and what pullup resistor value is recommended?

The open-drain RESET output on MAX6320PUK43CY/V+T allows connection to any supply voltage up to 6V, enabling level translation and wired-OR reset buses. A 10kΩ pullup resistor is recommended for most applications, ensuring logic-high recognition while limiting current to <0.5mA when RESET is asserted. The output sinks up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V.

Is MAX6320PUK43CY/V+T qualified for automotive applications, and what does the "/V" suffix indicate?

Yes, the "/V" suffix in MAX6320PUK43CY/V+T explicitly denotes AEC-Q100 qualification per Grade 1 (-40°C to +125°C). This includes stress testing for temperature cycling, humidity, and mechanical shock. The device is manufactured and tested to automotive reliability standards, making it suitable for under-hood and cabin electronics without additional qualification by the end customer.