Analog Devices Inc./Maxim Integrated MAX6337US16D3+T

Overview

The MAX6337US16D3+T from Maxim Integrated is an ultra-low-voltage, open-drain microprocessor supervisory circuit designed to monitor 1.6V power supplies in space-constrained embedded systems. It asserts an active-low RESET signal when VCC falls below 1.60V or during manual reset, with a guaranteed minimum timeout of 100ms and valid operation down to VCC = 1.0V. Used in portable equipment and automotive controllers for reliable brownout detection.

For engineers reviewing the MAX6337US16D3+T datasheet, MAX6337US16D3+T pinout, MAX6337US16D3+T application, or MAX6337US16D3+T equivalent, key selection criteria include its 1.6V factory-trimmed reset threshold, 100ms minimum reset timeout, open-drain output architecture, and SOT143 package compatibility with bidirectional µP reset pins.

Technical Context

This device implements a precision voltage comparator with ±1.8% (25°C) and ±3% (-40°C to +125°C) reset threshold tolerance, immune to fast VCC transients up to 24µs at 10V/ms slew rate. Its internal 20kΩ MR pull-up eliminates external components for manual reset functionality.

The open-drain RESET output requires an external pull-up resistor and supports interfacing with bidirectional reset pins (e.g., Motorola 68HC11), while its guaranteed correct state down to VCC = 1.0V ensures deterministic behavior during deep brownout conditions.

Key Specifications

Pinout & Package

Package: 4-pin SOT143 (1.3mm × 2.1mm × 0.9mm), surface-mount, lead-free compatible (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6336US16D3+T and MAX811TEUS29+T, the MAX6337US16D3+T uniquely combines 1.6V threshold accuracy, open-drain output for bus sharing, and guaranteed 1.0V operation-making it optimal for low-voltage automotive and portable designs requiring flexible reset signaling.

Availability

MAX6337US16D3+T is available at Aetrix Electronics and suitable for portable electronics, automotive control units, and industrial embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6337US16D3+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 analog and mixed-signal ICs for power, sensing, and interface applications.

The MAX633x family delivers ultra-low-voltage, low-power supervisory circuits targeting battery-powered, automotive, and space-constrained embedded systems requiring precise brownout detection and manual reset capability.

FAQ

What is the factory-trimmed reset threshold voltage for MAX6337US16D3+T?

The MAX6337US16D3+T has a factory-trimmed reset threshold of 1.60V, with ±1.8% tolerance at +25°C and ±3% over -40°C to +125°C. This value is laser-trimmed during production and specified in Table 1 of the datasheet; no external adjustment is needed. The threshold remains stable across temperature and supply variations, making MAX6337US16D3+T suitable for precise 1.6V rail monitoring in critical applications.

Does MAX6337US16D3+T support manual reset functionality, and how is it implemented?

Yes, MAX6337US16D3+T includes a debounced manual-reset input (MR) that requires no external components. The MR pin features an internal 20kΩ pull-up resistor, so it can be left unconnected if unused. To activate manual reset, connect a normally open momentary switch between MR and GND. The internal debounce logic ensures clean reset assertion without contact bounce artifacts-eliminating the need for RC filters or firmware debouncing. This behavior is fully specified and tested across temperature for MAX6337US16D3+T.

What is the minimum supply voltage at which MAX6337US16D3+T guarantees correct RESET output state?

MAX6337US16D3+T guarantees correct RESET output state down to VCC = 1.0V, unlike the MAX6335/MAX6336 variants which guarantee operation to 0.7V. Below 1.0V, the open-drain output's sinking capability degrades, and RESET may drift due to pull-up dominance. Therefore, MAX6337US16D3+T is validated for reliable brownout detection in 1.6V systems experiencing deep dips-but not recommended for applications requiring RESET validity below 1.0V.

Can MAX6337US16D3+T interface directly with microcontrollers having bidirectional reset pins?

Yes, MAX6337US16D3+T is specifically designed for this use case. Its open-drain active-low RESET output allows wired-OR connection with other reset sources on a shared bus-such as the Motorola 68HC11. When used with a single external pull-up resistor, either the MAX6337US16D3+T or the µP can assert reset independently. This eliminates contention and supports hot-swap or multi-source reset architectures without additional logic, as confirmed in the Applications Information section of the MAX6337US16D3+T datasheet.

What are the key differences between MAX6337US16D3+T and MAX6335US16D3+T?

The primary difference is output structure: MAX6337US16D3+T uses an open-drain active-low RESET, while MAX6335US16D3+T uses a push/pull active-high RESET. Additionally, MAX6337US16D3+T guarantees correct operation down to VCC = 1.0V, whereas MAX6335US16D3+T guarantees down to 0.7V. Both share identical 1.60V reset threshold, 100ms timeout, SOT143 package, and MR functionality. The choice depends on system-level reset bus architecture and voltage margin requirements.