Analog Devices Inc./Maxim Integrated MAX6344TUT-T

Overview

MAX6344TUT-T from Maxim Integrated is an active-high push-pull µP supervisory circuit in SOT23-6 packaging, designed to monitor VCC supply voltage and assert a clean reset signal when voltage falls below 3.08V (factory-trimmed threshold), guaranteeing valid RESET output down to VCC = +1V with ≥100ms timeout. It integrates a dedicated power-fail comparator (PFI/PFO) for early warning of supply collapse or low-battery conditions in portable systems.

For engineers reviewing the MAX6344TUT-T datasheet, MAX6344TUT-T pinout, MAX6344TUT-T application, or MAX6344TUT-T equivalent, this device delivers precise reset control with no manual-reset input-enabling simplified system-level reset sequencing in multivoltage embedded designs where deterministic high-assertion timing and supply monitoring are critical.

Technical Context

The MAX6344TUT-T implements a precision bandgap-based reset comparator with factory-trimmed 3.08V ±1.5% threshold over –40°C to +125°C, paired with a separate 1.25V reference for the PFI input. Its active-high push-pull RESET output drives logic-high during normal operation and asserts low for ≥100ms after VCC rises above threshold or after recovery from brownout.

Unlike MAX6342/MAX6343, the MAX6344TUT-T omits MR input and open-drain configuration-simplifying interface design for µPs requiring active-high reset assertion without external pull-up. The PFO output responds to PFI voltage crossing 1.25V with <5µs delay, enabling real-time power-fail detection independent of reset state.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6, surface-mount, lead-free compatible (suffix -T denotes leaded; +T required for RoHS-compliant ordering).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6344TUT-T, MAX6342TUT-T adds manual reset flexibility but requires active-low µP interface, while TPS3808G30DBVR trades away power-fail monitoring and ultra-low IQ for tighter threshold accuracy and longer reset duration-making MAX6344TUT-T optimal for battery-powered systems needing both precision reset and predictive supply health signaling.

Availability

MAX6344TUT-T is available at Aetrix Electronics and suitable for portable computers, telecom equipment, and embedded control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6344TUT-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) designs precision analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6342–MAX6345 family was engineered specifically for high-reliability microprocessor supervision in space-constrained, multivoltage systems-emphasizing factory-trimmed accuracy, wide temperature operation, and integrated power-fail warning without external components.

FAQ

What is the exact reset threshold voltage of the MAX6344TUT-T?

The MAX6344TUT-T has a factory-trimmed reset threshold of 3.08V with ±1.5% tolerance over the full –40°C to +125°C operating range. This value is laser-trimmed during production and specified in the Electrical Characteristics table under "VTH Reset Threshold" for the "T" suffix variant. The MAX6344TUT-T does not require external calibration or adjustment to achieve this accuracy.

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

No, the MAX6344TUT-T does not include a manual reset (MR) input. Unlike the MAX6342TUT-T and MAX6343TUT-T, the MAX6344TUT-T is configured exclusively with an active-high push-pull RESET output and omits the MR pin (pin 5 is NC). This simplifies PCB layout and eliminates debounce circuitry when manual reset is not required in the target application.

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

The PFI pin on the MAX6344TUT-T connects to an internal 1.25V comparator reference. When voltage at PFI falls below 1.25V, the open-drain PFO output pulls low within 5µs. This allows monitoring of secondary supplies (e.g., battery or auxiliary rail) using a simple resistor divider. The MAX6344TUT-T uses PFO independently of its reset function-enabling early warning before VCC crosses the 3.08V reset threshold.

What is the minimum supply voltage at which the MAX6344TUT-T guarantees valid RESET output?

The MAX6344TUT-T guarantees valid RESET output down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This means the active-high RESET output remains logically correct (high during normal operation, low during fault) even as VCC decays from 3.3V to 1.0V-critical for graceful shutdown in battery-backed systems where VCC may sag slowly.

Is the MAX6344TUT-T pin-compatible with other devices in the MAX6342–MAX6345 family?

The MAX6344TUT-T shares the same SOT23-6 package and pinout as MAX6342TUT-T and MAX6343TUT-T, but pin functions differ: pin 5 is RESET (active-high push-pull) instead of MR, and pin 6 is NC instead of RESET or RESET. Therefore, it is not pin-compatible for direct replacement without schematic and layout review-especially due to the missing MR function and redefined pin 5 behavior.