Analog Devices Inc./Maxim Integrated MAX6337US22D3+T

Overview

MAX6337US22D3+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. It features a factory-trimmed 2.20V reset threshold, 100ms minimum reset timeout period, guaranteed operation down to VCC = 1.0V, and consumes only 3.3µA typical supply current at 2.5V. It is used in portable equipment and automotive systems where precise brownout detection and manual-reset debouncing are required.

For engineers reviewing the MAX6337US22D3+T datasheet, MAX6337US22D3+T pinout, MAX6337US22D3+T application, or MAX6337US22D3+T equivalent, key selection criteria include its open-drain RESET output for bidirectional µP interface compatibility, 2.2V threshold accuracy over temperature (±3%), 100ms timeout stability across -40°C to +125°C, and SOT143 package suitability for space-constrained embedded designs.

Technical Context

The MAX6337US22D3+T implements a precision voltage comparator with factory-trimmed 2.20V threshold (±1.8% at +25°C, ±3% over full temperature range), immune to fast VCC transients up to 24µs at 10mV overdrive. Its internal debounced manual-reset input (MR) requires only a momentary switch to GND and includes a 20kΩ pull-up resistor.

Reset assertion remains active for ≥100ms after VCC rises above 2.20V or MR is released, ensuring robust power-on sequencing. The open-drain RESET output supports wired-OR configurations and interfaces directly with bidirectional reset pins (e.g., Motorola 68HC11) using an external pull-up resistor.

Key Specifications

Pinout & Package

MAX6337US22D3+T is housed in a 4-pin SOT143 surface-mount package (3.0mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6336US22D3+T and TPS3808G22DBVR, the MAX6337US22D3+T uniquely combines open-drain output for flexible bus interfacing, guaranteed 1.0V operation for deep brownout detection, and integrated MR debouncing - making it optimal for space-constrained, multi-rail embedded systems requiring field-service reset capability.

Availability

MAX6337US22D3+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O submodules requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.

Supply support for MAX6337US22D3+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 industrial, automotive, and computing applications.

The MAX6335/MAX6336/MAX6337 family delivers ultra-low-voltage, low-power µP supervisory circuits targeting space- and power-constrained embedded systems needing precise reset control and manual reset integration without external components.

FAQ

What is the factory-trimmed reset threshold voltage for MAX6337US22D3+T?

The MAX6337US22D3+T has a factory-trimmed reset threshold of 2.20V, with ±1.8% accuracy at +25°C and ±3% over the full -40°C to +125°C operating range. This value is laser-trimmed during production and does not require external adjustment. The threshold is specified for VCC falling conditions and ensures reliable detection of 2.2V brownouts in 1.8V/2.5V systems. The MAX6337US22D3+T datasheet confirms this value in Table 1 and Electrical Characteristics.

Does MAX6337US22D3+T support manual reset, and how is it implemented?

Yes, MAX6337US22D3+T includes a debounced manual-reset (MR) input that requires no external components. A logic-low pulse on MR asserts RESET; the internal circuitry filters out glitches shorter than 12ns. An internal 20kΩ pull-up resistor allows MR to be left unconnected if unused. For manual operation, connect a normally open momentary switch between MR and GND. The MAX6337US22D3+T maintains reset assertion for ≥100ms after MR returns high, ensuring clean system restart.

What is the minimum VCC voltage at which MAX6337US22D3+T guarantees correct RESET output behavior?

The MAX6337US22D3+T guarantees correct RESET output behavior 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 non-active due to external pull-up dominance. This 1.0V specification is explicitly stated in the General Description and Absolute Maximum Ratings sections of the MAX6337US22D3+T datasheet.

Can MAX6337US22D3+T drive a reset line shared with other devices?

Yes, MAX6337US22D3+T's open-drain RESET output is specifically designed for wired-OR configurations. Multiple supervisors (e.g., power supply monitors, watchdog timers) can share a single reset bus by connecting their open-drain outputs together with one pull-up resistor. Any device asserting reset pulls the line low, ensuring system-wide reset coordination. This capability is confirmed in the Applications Information section of the MAX6337US22D3+T datasheet under "Interfacing to µPs with Bidirectional Reset Pins".

What package type and dimensions does MAX6337US22D3+T use?

MAX6337US22D3+T uses a 4-pin SOT143 (also referenced as SOT-143 or SOT-143-4) surface-mount package measuring 3.0mm × 1.6mm × 1.1mm. This compact outline is documented in the Package Information section and shown in the Pin Configuration diagram of the MAX6337US22D3+T datasheet. The top mark for this variant is KAAZ, and the package is RoHS-compliant and available in lead-free form (indicated by the "+T" suffix).