Analog Devices Inc./Maxim Integrated MAX706ESA+T

Overview

MAX706ESA+T from Maxim Integrated is a precision microprocessor supervisory circuit providing active-low reset, watchdog timeout, power-fail warning, and manual-reset functions for +5V systems. It asserts RESET below 4.40V with 200ms pulse width, monitors PFI at 1.25V threshold, and triggers WDO after 1.6s watchdog timeout-used in industrial controllers and embedded instrumentation requiring reliable brownout and fault recovery.

For engineers reviewing the MAX706ESA+T datasheet, MAX706ESA+T pinout, MAX706ESA+T application, or MAX706ESA+T equivalent, this page delivers verified specifications, validated SO-8 pin mapping, real-world use cases in critical μP monitoring, and two confirmed alternative parts with documented functional differences.

Technical Context

The MAX706ESA+T integrates four core supervisory functions in a single IC: a precision voltage monitor with 4.40V reset threshold and 40mV hysteresis, a 1.6s watchdog timer with edge-sensitive WDI input, a 1.25V power-fail comparator (PFI/PFO), and a debounced TTL/CMOS-compatible manual-reset input (MR) with 250μA internal pull-up.

Its RESET output remains valid down to VCC = 1V (guaranteed 0.4V max sink voltage at 3.2mA), and WDO responds immediately to VCC drops below threshold without minimum pulse delay-enabling low-line detection independent of watchdog state. All timing and voltage thresholds are specified over –40°C to +85°C.

Key Specifications

Pinout & Package

MAX706ESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant with lead-free finish (+ suffix), footprint compatible with industry-standard SOIC-8 land pattern.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706CSA and MAX706CUA, the MAX706ESA+T uniquely balances extended temperature operation (–40°C to +85°C), standard SO-8 manufacturability, and RoHS compliance-making it optimal for industrial and transportation designs requiring field reliability without layout change.

Availability

MAX706ESA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management, and automotive infotainment ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX706ESA+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, communications, and computing markets, emphasizing high reliability and integration density.

The MAX705–MAX708 family was engineered specifically for cost-sensitive, space-constrained microprocessor systems needing guaranteed reset behavior, watchdog safety, and multi-rail monitoring-without external components.

FAQ

What is the reset threshold voltage for MAX706ESA+T?

The MAX706ESA+T has a nominal reset threshold of 4.40V with ±150mV tolerance over temperature. This value is factory-trimmed and guaranteed across the –40°C to +85°C operating range. The device asserts its active-low RESET output whenever VCC falls below this threshold and holds it low until VCC rises above 4.40V plus 40mV hysteresis, followed by a 200ms timing delay.

Does MAX706ESA+T support watchdog functionality?

Yes, the MAX706ESA+T includes a fully integrated watchdog timer with a nominal timeout period of 1.6 seconds. It monitors the WDI pin for edges; if no rising or falling transition occurs within that window, WDO goes low. The timer clears automatically on RESET assertion, MR activation, or WDI three-state condition-ensuring robust firmware hang detection in the MAX706ESA+T.

Can MAX706ESA+T monitor voltages other than +5V?

Yes, the MAX706ESA+T can monitor any DC voltage using its PFI input and internal 1.25V reference. By connecting a resistor divider from the target rail to PFI, users scale the monitored voltage to fall below 1.25V prior to critical dropout-enabling early-warning detection for +12V, –5V, or battery supplies. The MAX706ESA+T's PFI input draws only ±25nA, minimizing loading error.

What is the minimum VCC required for RESET output validity in MAX706ESA+T?

The MAX706ESA+T guarantees valid RESET output down to VCC = 1.0V. At this voltage, RESET remains a logic-low output capable of sinking ≥50μA while maintaining ≤0.3V. This feature ensures deterministic reset assertion during deep brownout recovery-critical for systems where VCC may sag below 2V before stabilizing, and is a defined specification of the MAX706ESA+T.

Is MAX706ESA+T RoHS-compliant and lead-free?

Yes, the "+T" suffix in MAX706ESA+T explicitly denotes lead(Pb)-free and RoHS-compliant packaging. It uses matte-tin plating on the SO-8 leads and meets JEDEC J-STD-020 reflow profiles for lead-free soldering (peak 260°C). The device is manufactured and tested to RoHS Directive 2011/65/EU requirements, and full compliance documentation is available from Maxim Integrated for the MAX706ESA+T.