Analog Devices Inc./Maxim Integrated MAX6332UR22D3+

Overview

MAX6332UR22D3+ from Maxim Integrated is an ultra-low-voltage, push/pull active-high microprocessor supervisory circuit in a 3-pin SOT23 package. It monitors 1.8V–3.3V power supplies, asserts a high-level RESET signal when VCC falls below 2.20V (±1.8% at +25°C), and holds it for ≥100ms after VCC recovers-ensuring reliable power-on reset for embedded controllers and battery-powered systems.

For engineers reviewing the MAX6332UR22D3+ datasheet, MAX6332UR22D3+ pinout, MAX6332UR22D3+ application, or MAX6332UR22D3+ equivalent, key selection criteria include its 0.7V minimum operating voltage, 3.3μA supply current, factory-trimmed 2.20V threshold, 100ms timeout, and guaranteed RESET validity down to VCC = 0.7V-critical for low-power brownout detection in portable instrumentation and industrial microcontrollers.

Technical Context

The MAX6332UR22D3+ implements a precision bandgap-based reset comparator with ±1.8% initial accuracy at +25°C and ±3% over –40°C to +125°C. Its internal timing circuit generates a fixed 100ms minimum reset timeout after VCC rises above the 2.20V threshold, independent of external components.

Designed for direct integration into space-constrained systems, it features push/pull output drive capable of sourcing ≥200μA at 0.8×VCC and sinking ≥500μA to 0.3V, with immunity to VCC transients ≤24μs at 10V/ms slew rate-enabling robust operation in noisy power environments.

Key Specifications

Pinout & Package

MAX6332UR22D3+ is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051) with 0.95mm pitch, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6332UR22D3+, MAX6327UR22D3+ provides identical timing and threshold but inverted logic polarity, while TPS3123-22DBVR trades higher supply current for extended timeout and broader manufacturer support-making MAX6332UR22D3+ optimal for space- and current-constrained active-high reset designs.

Availability

MAX6332UR22D3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6332UR22D3+ 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 industrial, automotive, communications, and computing markets.

The MAX6332 series belongs to Maxim's ultra-low-voltage supervisory portfolio, engineered specifically for reliable power-on reset and brownout protection in battery-powered and harsh-environment embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6332UR22D3+ and how tightly is it specified?

The MAX6332UR22D3+ has a factory-trimmed nominal 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 precision eliminates manual calibration and ensures consistent brownout detection across temperature and unit-to-unit variation-critical for compliance with IEC 61000-4-11 immunity testing in MAX6332UR22D3+ deployments.

Does MAX6332UR22D3+ remain functional during deep brownout conditions?

Yes, MAX6332UR22D3+ is guaranteed to operate and assert valid RESET down to VCC = 0.7V, enabling fail-safe reset assertion even as supply voltages collapse. Its push/pull output maintains defined logic levels (≥0.8×VCC high, ≤0.3V low) throughout this range-unlike open-drain alternatives that require external pull-ups and lose drive strength below 1.0V.

How does the 100ms reset timeout of MAX6332UR22D3+ improve system reliability?

The MAX6332UR22D3+ guarantees a minimum 100ms reset timeout after VCC rises above 2.20V, providing sufficient time for microcontroller clock stabilization, PLL lock, memory initialization, and peripheral configuration before software execution begins. This eliminates race conditions common with shorter timeouts in complex SoCs-directly enhancing boot repeatability in MAX6332UR22D3+ based designs.

Can MAX6332UR22D3+ replace MAX809 in existing designs?

MAX6332UR22D3+ is pin-compatible with MAX809 and shares identical SOT23-3 pinout (VCC, RESET, GND), but differs in output polarity: MAX6332UR22D3+ provides active-high RESET versus MAX809's active-low. Direct replacement requires verifying μP reset input polarity and may necessitate schematic revision or firmware adjustment to accommodate the inverted logic level.

What is the maximum VCC slew rate that MAX6332UR22D3+ can tolerate without false reset assertion?

MAX6332UR22D3+ rejects VCC transients with durations ≤24μs when the supply falls at 10V/ms, as confirmed by its VCC falling propagation delay specification. This transient immunity prevents spurious resets caused by switching noise, load-dump events, or inrush current spikes-making MAX6332UR22D3+ suitable for electrically noisy environments like motor drives and automotive power systems.