Analog Devices Inc./Maxim Integrated MAX6337US17D3+

Overview

MAX6337US17D3+ from Maxim Integrated is an ultra-low-voltage, open-drain microprocessor supervisory circuit designed to monitor 1.8V–3.3V power supplies and assert a reliable active-low reset signal during brownout, power-up, or manual reset events. It features a factory-trimmed 1.70V reset threshold (±1.8% at +25°C), 100ms minimum reset timeout, 3.3µA supply current at 1.8V, and guaranteed operation down to VCC = 1.0V - ideal for battery-powered embedded controllers and portable instrumentation.

For engineers reviewing the MAX6337US17D3+ datasheet, MAX6337US17D3+ pinout, MAX6337US17D3+ application, or MAX6337US17D3+ equivalent, key selection criteria include its open-drain RESET output for bidirectional µP interface compatibility, immunity to fast VCC transients (<24µs at 10V/ms), debounced manual-reset input with internal 20kΩ pull-up, and SOT143 package suitability for space-constrained PCB layouts.

Technical Context

The MAX6337US17D3+ implements a precision bandgap-based reset comparator with factory-trimmed 1.70V threshold (1.65V–1.75V over –40°C to +125°C), enabling accurate monitoring of 1.8V logic rails. Its reset timeout is fixed at ≥100ms (nominal), generated by an on-chip RC timing network fully specified across temperature.

As an open-drain device, MAX6337US17D3+ requires an external pull-up resistor on RESET to interface with µPs having bidirectional reset pins (e.g., Motorola 68HC11); it does not guarantee valid RESET output below VCC = 1.0V due to reduced sink capability, distinguishing it from push/pull variants like MAX6336.

Key Specifications

Pinout & Package

MAX6337US17D3+ is housed in a 4-pin SOT143 package (JEDEC TO-236AB), measuring 2.9mm × 1.3mm × 1.0mm, with gull-wing leads optimized for automated assembly and thermal performance in compact designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6336US17D3+, MAX6337US17D3+ trades push/pull drive for open-drain flexibility and higher VCC lower limit (1.0V vs. 0.7V), while TLV803EB17DBZR offers lower ICC but longer timeout and incompatible packaging - choice depends on µP interface topology, brownout depth, and layout constraints.

Availability

MAX6337US17D3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6337US17D3+ 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 industrial, automotive, communications, and computing applications.

The MAX633x family delivers ultra-low-voltage, low-power supervisory circuits targeting space- and energy-constrained embedded systems where precise brownout detection and minimal BOM count are essential.

FAQ

What is the exact reset threshold voltage of MAX6337US17D3+ and how does it vary with temperature?

The MAX6337US17D3+ has a factory-trimmed nominal reset threshold of 1.70V, with ±1.8% tolerance at +25°C. Over the full operating range (–40°C to +125°C), the threshold remains within 1.65V to 1.75V. This tight specification ensures consistent brownout detection across automotive and industrial temperature extremes without external calibration.

Does MAX6337US17D3+ require an external pull-up resistor on the RESET pin, and why?

Yes, MAX6337US17D3+ requires an external pull-up resistor on the RESET pin because it features an open-drain output structure. Without the pull-up, RESET cannot actively drive high and will float. A typical value is 10kΩ–100kΩ to VCC, enabling wired-OR configurations and compatibility with µPs like the Motorola 68HC11 that use bidirectional reset pins.

Can MAX6337US17D3+ operate reliably during deep brownout conditions, and what is its minimum functional VCC?

Yes, MAX6337US17D3+ is guaranteed to maintain correct reset assertion and manual reset response down to VCC = 1.0V. Below this level, reset behavior is not specified. This makes it suitable for applications where the supply may collapse during engine cranking or battery depletion, though it does not support operation as low as the 0.7V limit of the MAX6336 variant.

How is the manual reset (MR) input debounced in MAX6337US17D3+, and is external circuitry needed?

The MR input of MAX6337US17D3+ is internally debounced using on-chip timing circuitry, and includes a 20kΩ internal pull-up resistor to VCC. No external RC network or pull-up is required - simply connect a normally open momentary switch between MR and GND to implement hardware reset. This reduces BOM count and PCB area in cost-sensitive designs.

What is the reset timeout period of MAX6337US17D3+, and is it adjustable?

The MAX6337US17D3+ has a factory-programmed nominal reset timeout period of 100ms (minimum), implemented with an internal RC network. This value is fixed and non-adjustable; it is selected at manufacture via the "D3" suffix in the part number. The timeout is fully specified over temperature (–40°C to +125°C) and ensures sufficient hold time for µP and peripheral initialization.