Analog Devices Inc./Maxim Integrated MAX706EUA+T

Overview

MAX706EUA+T from Maxim Integrated is a precision microprocessor supervisory circuit in an 8-pin µMAX package, providing active-low reset output, 1.6s watchdog timer, 4.40V supply-voltage monitor threshold, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot and brownout recovery in embedded controllers and industrial instrumentation.

For engineers reviewing the MAX706EUA+T datasheet, MAX706EUA+T pinout, MAX706EUA+T application, or MAX706EUA+T equivalent, this page delivers verified functional identity, temperature-rated operating parameters (–40°C to +85°C), reset pulse width (200ms), watchdog timeout (1.6s), and precise voltage thresholds critical for power-monitoring system design.

Technical Context

The MAX706EUA+T integrates four core supervisory functions: a reset generator triggered by VCC falling below 4.40V (±15mV hysteresis), a watchdog timer with 1.6s timeout requiring WDI edge transitions, a 1.25V precision reference-based power-fail comparator (PFI/PFO), and a TTL/CMOS-compatible manual-reset input with internal 250µA pull-up. All outputs are push-pull and guaranteed functional down to VCC = 1V.

Its architecture uses a single-bandgap reference shared across reset and PFI comparators, enabling tight threshold matching and low supply current (max 500µA at –40°C to +85°C). The device asserts RESET low during power-up, brownout, and MR activation, with no minimum pulse width on WDO - distinguishing it from RESET's fixed 200ms duration.

Key Specifications

Pinout & Package

MAX706EUA+T is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead-free, with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706EUA+T, MAX706CSA lacks extended temperature support and increases board area, while MAX706CUA trades guaranteed 500µA max current at –40°C for cost savings - making MAX706EUA+T the only variant fully specified across industrial temperature and current extremes in µMAX.

Availability

MAX706EUA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, smart energy meters, and critical μP power monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX706EUA+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 high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets, emphasizing integration, reliability, and precision.

The MAX705–MAX708 family was engineered specifically for cost-sensitive, space-constrained microprocessor systems needing guaranteed reset behavior, watchdog supervision, and multi-rail power monitoring in a single 8-pin device.

FAQ

What is the reset threshold voltage for MAX706EUA+T?

The MAX706EUA+T has a nominal reset threshold of 4.40V with ±15mV hysteresis, meaning RESET asserts low when VCC falls below 4.40V and releases only after VCC rises above 4.415V. This threshold is factory-trimmed and guaranteed over the full –40°C to +85°C operating range, ensuring consistent brownout protection in industrial environments where 5V rails may sag under load.

Does MAX706EUA+T provide an active-high reset output?

No, MAX706EUA+T provides only an active-low RESET output. It belongs to the MAX706 subfamily, which includes watchdog functionality and active-low reset - unlike the MAX707/MAX708 variants that offer both active-high and active-low reset outputs. For active-high reset, engineers must select MAX707EUA+T or MAX708EUA+T instead.

Can MAX706EUA+T monitor voltages other than +5V?

Yes, MAX706EUA+T can monitor any DC voltage using its PFI input. By connecting a resistor divider from the target supply to PFI, the 1.25V internal reference enables detection of supply droop - for example, scaling a +12V rail to 1.25V at PFI triggers PFO when the 12V line falls below ~11V. The PFI input draws only ±25nA, minimizing loading error.

What is the watchdog timeout period for MAX706EUA+T?

The watchdog timeout period for MAX706EUA+T is 1.6 seconds typical, with a guaranteed range of 1.00s to 2.25s over temperature and voltage. The timer resets on any rising or falling edge at WDI; if WDI remains static (high or low) beyond this window, WDO pulls low. Floating WDI disables the watchdog, causing WDO to track VCC directly.

Is MAX706EUA+T RoHS-compliant and lead-free?

Yes, MAX706EUA+T is RoHS-compliant and lead-free. The "+T" suffix explicitly denotes tape-and-reel packaging with lead(Pb)-free/RoHS-compliant construction, per Maxim's ordering convention. Its µMAX package (U8+1 outline) meets JEDEC standards for reflow soldering at +260°C peak temperature, and the exposed pad improves thermal performance in high-density layouts.