Analog Devices Inc./Maxim Integrated MAX6344TUT

Overview

MAX6344TUT from Maxim Integrated is an active-high push-pull µP supervisory circuit in a 6-pin SOT23 package, designed to monitor VCC supply voltage (1.0V–5.5V) and assert reset when VCC falls below 3.08V (factory-trimmed threshold), with guaranteed RESET validity down to VCC = +1V and 100ms minimum reset pulse width. It integrates a dedicated power-fail comparator (PFI/PFO) for low-battery or auxiliary supply monitoring in portable and multivoltage systems.

For engineers reviewing the MAX6344TUT datasheet, MAX6344TUT pinout, MAX6344TUT application, or MAX6344TUT equivalent, key selection criteria include its active-high push-pull RESET output, factory-set 3.08V reset threshold, -40°C to +125°C operating range, 6-pin SOT23 footprint, and integrated PFI/PFO comparator for independent power-fail warning-critical for battery-backed embedded control and telecom equipment.

Technical Context

The MAX6344TUT implements a precision bandgap-based reset threshold detector with ±25mV accuracy over temperature, coupled to a monostable timer that guarantees ≥100ms reset assertion after VCC recovery or MR release. Its PFI input connects to an internal 1.25V reference, enabling configurable power-fail detection via external resistor dividers.

Unlike MAX6342/MAX6343, the MAX6344TUT omits manual-reset (MR) input and open-drain output, instead providing only an active-high push-pull RESET output-simplifying interface to µPs with unidirectional reset inputs requiring high-true assertion. All logic thresholds are CMOS-compatible with VIL = 0.3×VCC and VIH = 0.7×VCC.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6 (1.6mm × 2.9mm × 1.1mm), surface-mount, lead-free compatible (suffix +T).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6344TUT, MAX6342TUT-T adds manual reset flexibility at the cost of active-low logic compatibility, while TLV803EC26DBZR reduces size and cost but sacrifices the integrated power-fail comparator-making MAX6344TUT the optimal choice when both precise 3.08V supervision and independent PFI/PFO are required in a single 6-pin package.

Availability

MAX6344TUT is available at Aetrix Electronics and suitable for portable computers, telecom equipment, and multivoltage systems requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned temperature performance.

Supply support for MAX6344TUT 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6342–MAX6345 family delivers highly accurate, low-power µP supervision with integrated power-fail detection-engineered for reliability in battery-constrained and thermally harsh environments where deterministic reset behavior is non-negotiable.

FAQ

What is the exact reset threshold voltage of the MAX6344TUT?

The MAX6344TUT has a factory-trimmed reset threshold of 3.08V, with a guaranteed tolerance of ±25mV over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during production and specified in the Electrical Characteristics table under "VTH Reset Threshold" for the "T" suffix variant. The threshold is referenced to the VCC supply and remains stable across voltage and temperature variations.

Does the MAX6344TUT include a manual-reset (MR) input?

No, the MAX6344TUT does not include a manual-reset (MR) input. Unlike the MAX6342TUT-T and MAX6343TUT-T variants, the MAX6344TUT is configured exclusively with an active-high push-pull RESET output and omits the MR pin (pin 5 is RESET, pin 6 is NC). This simplifies design for applications where only power-on reset supervision is required and eliminates routing complexity for pushbutton interfaces.

How does the PFI/PFO function work in the MAX6344TUT?

The MAX6344TUT's PFI pin connects to an internal 1.25V reference comparator. When the voltage at PFI drops below 1.25V, the open-drain PFO output pulls low-providing an early warning signal for power failure or low battery. Users configure detection level using an external resistor divider on PFI; for example, monitoring a +5V rail for 4.5V dropout requires R1/R2 ≈ 2.6. PFO operates independently of the RESET function and remains functional across the full VCC range.

What is the maximum sink/source capability of the MAX6344TUT RESET output?

The MAX6344TUT RESET output is an active-high push-pull driver capable of sourcing up to 800µA at VCC > 4.5V and sinking up to 1.2mA at VCC > 2.7V. Its VOH is guaranteed ≥0.8×VCC (with 50µA load) and VOL ≤0.4V (with 1.2mA sink), ensuring robust interfacing to standard CMOS µP reset inputs without external pull-up resistors. This eliminates BOM cost and layout overhead associated with open-drain alternatives.

Is the MAX6344TUT suitable for automotive applications?

Yes, the MAX6344TUT is qualified for operation from -40°C to +125°C and features guaranteed RESET validity down to VCC = +1V-key requirements for automotive body electronics and infotainment modules exposed to cold-crank and load-dump conditions. While not AEC-Q200 certified out-of-box, its electrical specifications, thermal performance, and SOT23-6 package meet foundational automotive reliability expectations; design-in validation per system-level requirements is recommended.