Analog Devices Inc./Maxim Integrated MAX6337US17D3+T

Overview

MAX6337US17D3+T 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 (±3% over temperature), 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 requiring robust power-on reset integrity.

For engineers reviewing the MAX6337US17D3+T datasheet, MAX6337US17D3+T pinout, MAX6337US17D3+T application, or MAX6337US17D3+T equivalent, key selection considerations include its open-drain RESET output for bidirectional µP interface compatibility, 1.7V threshold precision across -40°C to +125°C, debounced MR input eliminating external RC networks, and SOT143 footprint for space-constrained portable instrumentation.

Technical Context

The MAX6337US17D3+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 1.70V ±3%, rejecting transients up to 24µs at 100mV overdrive. Its internal 20kΩ MR pull-up enables direct connection of a momentary switch to GND without external components.

Reset assertion persists for ≥100ms after VCC rises above threshold or MR deasserts, ensuring sufficient processor initialization time. The open-drain RESET output requires an external pull-up and supports wired-OR configurations with other reset sources - critical for systems like Motorola 68HC11 where bidirectional reset pins demand controlled drive strength and voltage level independence.

Key Specifications

Pinout & Package

MAX6337US17D3+T is housed in a 4-pin SOT143 package (2.9mm × 1.3mm × 1.0mm), optimized for high-density PCB layouts in portable equipment. Pin 1 is VCC, Pin 2 is RESET (open-drain), Pin 3 is MR (manual reset input), and Pin 4 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6336US17D3+T and TPS3808G17DBVR, the MAX6337US17D3+T uniquely combines open-drain output for system-level reset arbitration, integrated MR debounce, and guaranteed 1.0V VCC operation - making it optimal for multi-source reset architectures in automotive and industrial control.

Availability

MAX6337US17D3+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O cards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6337US17D3+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 computing applications - emphasizing reliability, low power, and integration.

The MAX633x family delivers ultra-low-voltage supervisory circuits targeting space- and power-constrained embedded systems where deterministic reset behavior under brownout and transient conditions is non-negotiable.

FAQ

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

The MAX6337US17D3+T has a factory-trimmed nominal reset threshold of 1.70V, with tolerance of ±1.8% at +25°C and ±3% over the full -40°C to +125°C operating range. This ensures consistent brownout detection across automotive and industrial thermal profiles without external calibration. The MAX6337US17D3+T maintains this specification without drift due to its bandgap-based comparator architecture.

Does MAX6337US17D3+T require an external pull-up resistor on the RESET pin?

Yes - the MAX6337US17D3+T features an open-drain RESET output and requires an external pull-up resistor to define the high state. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. This configuration enables wired-OR reset sharing with other supervisors or µP reset outputs, a key design advantage of the MAX6337US17D3+T over push-pull alternatives.

Can MAX6337US17D3+T operate reliably during deep brownout conditions below 1.8V?

Yes - the MAX6337US17D3+T is guaranteed to function correctly down to VCC = 1.0V, with valid reset assertion and MR input response. Unlike push-pull variants (e.g., MAX6335/MAX6336), which operate to 0.7V, the MAX6337US17D3+T's open-drain architecture maintains defined logic states at these ultra-low voltages, though external pull-up sizing must account for reduced sink current.

How is manual reset debounced in MAX6337US17D3+T without external components?

The MAX6337US17D3+T integrates internal digital debounce logic on the MR pin, eliminating the need for external RC filters or Schmitt-trigger buffers. A logic-low pulse as short as 160µs at VCC = 2.6V reliably triggers reset, and spurious noise below 12ns is rejected. This built-in functionality reduces board area and improves reliability - a core differentiator of the MAX6337US17D3+T versus basic reset monitors.

Is MAX6337US17D3+T pin-compatible with legacy Maxim supervisors like MAX811?

Yes - the MAX6337US17D3+T shares identical 4-pin SOT143 pinout and footprint with MAX811/MAX812 and MAX6314/MAX6315 families. This allows drop-in replacement in existing designs without PCB revision, provided the open-drain output and 1.70V threshold meet system requirements. The MAX6337US17D3+T retains functional equivalence for reset generation while improving low-voltage operation and noise immunity.