Analog Devices Inc./Maxim Integrated MAX6342MUT

Overview

MAX6342MUT from Maxim Integrated is a precision microprocessor supervisory circuit in SOT23-6 package, providing factory-trimmed 4.38V VCC reset threshold, active-low push-pull RESET output, and manual-reset (MR) input. It monitors supply voltage integrity, asserts reset during power-up/brownout, and delivers a guaranteed 100ms minimum reset pulse width down to VCC = +1V - used in telecom power sequencing and embedded control systems.

For engineers reviewing the MAX6342MUT datasheet, MAX6342MUT pinout, MAX6342MUT application, or MAX6342MUT equivalent, key selection criteria include its 4.38V reset threshold tolerance (±25mV), PFI comparator for power-fail warning at 1.25V, MR debounce capability, and guaranteed RESET validity over full -40°C to +125°C industrial temperature range.

Technical Context

The MAX6342MUT integrates a precision bandgap reference, voltage comparator with hysteresis, reset timer, and CMOS-compatible MR input logic. Its internal 1.25V PFI threshold enables independent power-fail detection without affecting reset assertion timing.

Reset assertion is triggered when VCC falls below 4.38V (±25mV at +25°C) or MR is pulled low; RESET remains active for ≥100ms after VCC rises above threshold or MR returns high. The push-pull output drives up to 1.2mA sink current at VCC > 2.7V and maintains valid logic levels down to VCC = +1V.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6, surface-mount, lead-free compatible (top mark: AACQ).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6342MUT, MAX6343MUT-T offers identical supervision accuracy but requires board-level pull-up design trade-offs, while TLV809M33DBZR sacrifices PFI flexibility and MR support for lower cost and smaller footprint - neither is pin-compatible nor drop-in.

Availability

MAX6342MUT is available at Aetrix Electronics and suitable for telecom equipment, portable/battery-powered equipment, and multivoltage systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6342MUT 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 high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on reliability and integration.

The MAX6342–MAX6345 family was engineered specifically for robust power-supply monitoring in harsh environments, combining precision reset thresholds, power-fail warning, and manual reset in miniature SOT23-6 packaging.

FAQ

What is the exact reset threshold voltage of the MAX6342MUT?

The MAX6342MUT has a factory-trimmed VCC reset threshold of 4.38V with ±25mV tolerance at +25°C. This value is laser-trimmed during production and remains stable across -40°C to +125°C, ensuring consistent brownout detection for 3.3V and 5V systems. The MAX6342MUT datasheet specifies this threshold in the Electrical Characteristics table under "VTH Reset Threshold" for the "M" suffix variant.

Does the MAX6342MUT provide power-fail warning capability?

Yes, the MAX6342MUT includes a dedicated power-fail comparator with a fixed +1.25V threshold on the PFI pin. When the monitored voltage at PFI falls below 1.25V, the PFO pin asserts low - enabling early warning of supply collapse before the main VCC rail drops below the 4.38V reset threshold. This function is fully independent of the RESET output and is documented in the MAX6342MUT functional diagram and Applications Information section.

Can the MAX6342MUT operate down to 1V supply voltage?

Yes, the MAX6342MUT is guaranteed to assert a valid logic-level RESET output down to VCC = +1V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep undervoltage conditions - critical for fail-safe shutdown in battery-backed or energy-harvesting systems. The MAX6342MUT maintains this specification across its full -40°C to +125°C operating range.

What is the function of the MR pin on the MAX6342MUT?

The MR (Manual Reset) pin on the MAX6342MUT is a CMOS-compatible active-low input that forces RESET assertion when pulled low. It includes built-in 1µs minimum pulse rejection to debounce mechanical switches, and RESET remains active for ≥100ms after MR returns high. The MR pin is internally pulled up and can be left unconnected if unused - a feature explicitly defined in the MAX6342MUT Pin Description and Detailed Description sections.

Is the MAX6342MUT pin-compatible with other devices in the MAX6342–MAX6345 family?

No - while all MAX6342–MAX6345 variants share the same SOT23-6 package and pinout, the MAX6342MUT differs functionally from MAX6344/MAX6345 in having an MR input and active-low push-pull RESET, whereas MAX6344 provides active-high RESET and MAX6345 provides dual RESET outputs. Pin compatibility exists physically, but electrical behavior and signal assignment differ per variant - confirmed in the Selector Guide and Pin Configurations tables of the MAX6342MUT datasheet.