Analog Devices Inc./Maxim Integrated MAX706SEUA+T

Overview

MAX706SEUA+T from Maxim Integrated is an active-low microprocessor supervisory circuit in 8-pin µMAX package, providing reset generation (200ms delay), watchdog timeout (1.6s), 1.25V power-fail comparator input, and debounced manual-reset input - all optimized for +3V/+3.3V systems in battery-powered portable instruments and industrial controllers.

For engineers reviewing the MAX706SEUA+T datasheet, MAX706SEUA+T pinout, MAX706SEUA+T application, or MAX706SEUA+T equivalent, this page delivers verified functional identity, exact reset threshold (2.93V), guaranteed RESET assertion down to VCC = 1V, WDI disable capability, and validated alternatives for brownout monitoring and watchdog supervision in embedded µP systems.

Technical Context

The MAX706SEUA+T implements a precision voltage monitor with fixed 2.93V reset threshold (±1.5% over temperature), integrated 200ms reset timer, and independent watchdog circuit that resets on missing WDI transitions within 1.6s. Its PFI input connects to an internal 1.25V reference for configurable power-fail or low-battery detection.

It features TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V, 100µA quiescent current, and guaranteed RESET output sinking capability down to VCC = 1V - enabling reliable reset assertion during deep brownout conditions without external pull-down.

Key Specifications

Pinout & Package

MAX706SEUA+T is housed in an 8-pin µMAX package (U8-1), 3mm × 3mm, exposed pad, lead-free, surface-mountable with thermal performance suitable for compact portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706SESA+, MAX706SEUA+T saves board area and improves thermal performance via µMAX package; compared with TPS3808G33DBVR, it adds critical watchdog supervision and programmable power-fail detection - essential for robust field-deployed systems.

Availability

MAX706SEUA+T is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX706SEUA+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 industrial, medical, communications, and computing applications.

The MAX706 family targets cost-sensitive, space-constrained µP systems needing integrated reset, watchdog, and power-fail monitoring - specifically engineered for reliability in portable and embedded environments.

FAQ

What is the exact reset threshold voltage for MAX706SEUA+T and how tightly is it specified?

The MAX706SEUA+T has a nominal reset threshold of 2.93V, with a guaranteed tolerance of ±1.5% over the full -40°C to +85°C operating temperature range. This specification ensures reliable detection of brownout on +3.3V supplies without requiring external calibration or trimming components. The threshold is factory-trimmed and tested, and the MAX706SEUA+T datasheet confirms this value applies specifically to the 'S' variant across all package types including the µMAX U8-1.

Does MAX706SEUA+T include a watchdog timer, and what is its timeout behavior?

Yes, MAX706SEUA+T includes a watchdog timer with a nominal timeout period of 1.6 seconds. The timer resets on any edge transition at the WDI pin and asserts WDO low if no transition occurs within that window. Unlike the 'P' variant, the MAX706SEUA+T (as an 'S' suffix part) supports automatic watchdog disable when WDI is left open or driven high-impedance - a key feature confirmed in the Electrical Characteristics table and Pin Description section of the official datasheet.

Can MAX706SEUA+T monitor a secondary voltage like a battery or unregulated rail?

Yes, MAX706SEUA+T can monitor secondary voltages using its PFI (Power-Fail Input) pin, which compares against an internal 1.25V reference. By connecting PFI to a resistive divider from the target rail (e.g., battery), the device asserts PFO low when the divided voltage falls below 1.25V - enabling precise low-battery warning or unregulated supply dropout detection. This function is explicitly documented for MAX706SEUA+T in the Applications Information and Typical Operating Circuits sections.

What is the minimum VCC level at which MAX706SEUA+T guarantees RESET assertion?

MAX706SEUA+T guarantees RESET remains asserted (low) down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and confirmed in the RESET and RESET Outputs section. This ensures deterministic reset behavior during deep brownout events where other supervisors may release prematurely. The guarantee holds across the full -40°C to +85°C temperature range and is a distinguishing feature of the MAX706 family versus lower-cost alternatives.

Is the manual reset input (MR) of MAX706SEUA+T debounced, and what is its minimum pulse width?

Yes, the MR input of MAX706SEUA+T is effectively debounced by its internal 200ms reset timing - no external RC network is needed. The minimum valid MR pulse width is 500ns at VCC = 3.0V and 150ns at VCC = 5.0V, as specified in the Electrical Characteristics table. MR is TTL/CMOS-compatible and internally pulled up with a 70µA current source, allowing direct connection to pushbutton switches or logic outputs without external components.