Analog Devices Inc./Maxim Integrated MAX6335US22D3

Overview

MAX6335US22D3 from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit in SOT143 package, designed for 1.8V–3.3V digital systems. It monitors VCC with factory-trimmed 2.20V reset threshold, asserts RESET high during brownout or manual reset, and maintains reset for 100ms minimum after recovery. Used in portable equipment and automotive controllers for reliable power-on reset.

For engineers reviewing the MAX6335US22D3 datasheet, MAX6335US22D3 pinout, MAX6335US22D3 application, or MAX6335US22D3 equivalent, key selection criteria include its 0.7V operating voltage floor, 3.3µA supply current, 100ms timeout, active-high output structure, and guaranteed RESET validity down to VCC = 0.7V - critical for ultra-low-voltage embedded reset integrity.

Technical Context

The MAX6335US22D3 implements a precision bandgap-based reset comparator with ±1.8% (25°C) and ±3% (-40°C to +125°C) threshold accuracy over temperature. Its internal debounced manual-reset input (MR) features a 20kΩ pull-up and 160µs minimum pulse width requirement at VCC = 2.6V.

Reset assertion occurs on VCC falling below 2.20V or MR low; deassertion follows VCC rise above threshold or MR release, with a fixed 100ms minimum timeout period. The push/pull output drives high (VOH ≥ 0.8VCC at ISOURCE = 200µA, VCC ≥ 1.8V) and low (VOL ≤ 0.3V at ISINK = 500µA, VCC ≥ 1.8V), ensuring clean logic-level signaling without external pull-ups.

Key Specifications

Pinout & Package

MAX6335US22D3 is housed in a 4-pin SOT143 surface-mount package (1.3mm × 2.1mm, 0.95mm height), optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811TEUS22+T and TPS3808G125DBVR, the MAX6335US22D3 uniquely combines factory-programmed 100ms timeout, integrated MR debouncing, and guaranteed 0.7V operation - enabling simpler, more robust reset architecture in space- and power-constrained designs without external components.

Availability

MAX6335US22D3 is available at Aetrix Electronics and suitable for portable medical monitors, automotive body control modules, industrial PLC I/O modules, smart energy meters, and battery-backed data loggers requiring stable component supply across extended temperature and low-voltage conditions.

Supply support for MAX6335US22D3 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, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.

The MAX6335US22D3 belongs to Maxim's µP supervisory product line, engineered for ultra-low-voltage reliability in battery-powered and harsh-environment systems where deterministic reset behavior is non-negotiable.

FAQ

What is the exact reset threshold voltage for MAX6335US22D3?

The MAX6335US22D3 has a factory-trimmed reset threshold of 2.20V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "US22" suffix variant of the MAX6335 family. The MAX6335US22D3 uses this precise threshold to trigger reset when VCC falls below 2.20V.

Does MAX6335US22D3 support manual reset, and how is it implemented?

Yes, the MAX6335US22D3 includes a debounced manual-reset input (MR) on pin 3. A logic-low signal (≤0.5V) on MR asserts the active-high RESET output, and reset remains asserted for the full 100ms timeout after MR returns high. An internal 20kΩ pull-up resistor allows MR to be left unconnected if unused. This feature is integral to the MAX6335US22D3 design and eliminates external debounce circuitry.

What is the minimum supply voltage at which MAX6335US22D3 guarantees correct RESET output behavior?

The MAX6335US22D3 guarantees correct RESET output state down to VCC = 0.7V - meaning the active-high RESET pin remains valid and properly driven (VOH ≥ 0.8VCC, VOL ≤ 0.3V) even as supply voltage collapses. This specification is explicitly stated for MAX6335/MAX6336 variants in the General Description and Electrical Characteristics sections of the datasheet, and applies directly to the MAX6335US22D3.

Is MAX6335US22D3 pin-compatible with other Maxim reset supervisors?

Yes, the MAX6335US22D3 is pin-compatible with the MAX811/MAX812 and MAX6314/MAX6315 families in the same SOT143 package. Pin assignments (VCC, GND, RESET, MR) match exactly, enabling drop-in replacement in existing layouts where the active-high output and 2.20V threshold meet system requirements. This compatibility is explicitly documented in the Features section of the MAX6335US22D3 datasheet.

What is the guaranteed reset timeout period for MAX6335US22D3, and is it adjustable?

The MAX6335US22D3 has a factory-programmed nominal reset timeout period of 100ms minimum, as indicated by the "D3" suffix in the part number. This timeout is fixed and non-adjustable - no external capacitor or resistor modifies it. The device holds RESET high for ≥100ms after VCC rises above 2.20V or after MR is released, ensuring reliable microprocessor initialization. This value is specified in the Electrical Characteristics table under tRP.