Analog Devices Inc./Maxim Integrated DS1706EUA+

Overview

DS1706EUA+ from Maxim Integrated is a 5.0V ±10% microprocessor supervisory circuit that monitors VCC, provides pushbutton reset control, and implements a 1-second watchdog timer with NMI early-warning interrupt. It delivers active-low reset (RST), non-maskable interrupt (NMI), and watchdog status (WDS) outputs in an 8-pin µSOP package for embedded systems requiring reliable power-up/power-down sequencing and software fault recovery.

For engineers reviewing the DS1706EUA+ datasheet, DS1706EUA+ pinout, DS1706EUA+ application, or DS1706EUA+ equivalent, this page details its precise reset threshold (4.25–4.50 V), 130 ms minimum reset pulse width, 1.25 V IN-sense reference, watchdog timeout (1.0–2.2 s), and industrial temperature range (–40°C to +85°C) - all critical for microcontroller-based power monitoring and fail-safe design.

Technical Context

The DS1706EUA+ integrates three independent monitoring functions: precision VCC detection using an internal bandgap reference and comparator, debounced pushbutton reset with guaranteed 130 ms active-low pulse, and a self-resetting watchdog timer triggered by ST input transitions. Its IN pin accepts externally scaled supply voltages via resistor divider, enabling early power-fail detection upstream of the microprocessor.

Reset assertion occurs when VCC drops below 4.25 V (min), holding RST low for ≥130 ms after VCC recovery; NMI pulses low for ≥200 µs at the same trip point with 100 µV hysteresis to reject noise; WDS goes low if ST is not strobed within 1.0–2.2 s. All logic operates across 1.2–5.5 V supply range with <60 µA quiescent current.

Key Specifications

Pinout & Package

DS1706EUA+ is housed in an 8-pin µSOP (118-mil) package with exposed pad for thermal performance and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706ESA+ and TPS3808G12DBVR, the DS1706EUA+ uniquely combines factory-trimmed 5 V ±10% reset, dedicated IN-sense with NMI early warning, and ST-input watchdog in one 8-pin µSOP-enabling compact, robust, and feature-complete supervision without design compromises.

Availability

DS1706EUA+ is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical devices, and point-of-sale terminals requiring stable component supply and long-term lifecycle assurance.

Supply support for DS1706EUA+ 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 DS1706EUA+ belongs to the MicroMonitor™ family-engineered specifically for microprocessor system supervision, integrating power monitoring, reset generation, and watchdog functionality in minimal footprint packages.

FAQ

What is the exact VCC reset threshold range for DS1706EUA+?

The DS1706EUA+ has a factory-trimmed VCC trip point of 4.25 V (minimum), 4.40 V (typical), and 4.50 V (maximum), corresponding to a ±10% tolerance around 5.0 V. This specification is validated across the full industrial temperature range (–40°C to +85°C) and ensures reliable reset assertion before microprocessor operational failure. The DS1706EUA+ datasheet confirms these values in the DC Electrical Characteristics table under VCCTP parameter.

Does DS1706EUA+ support both active-low and active-high reset outputs?

No, the DS1706EUA+ provides only an active-low reset output (RST). Unlike variants such as DS1706LEUA+ (which offers active-high RST), the DS1706EUA+ is designated for /RST, /WDS configuration per Maxim's ordering information. Its RST pin is open-drain and requires an external pull-up; *RST (active-high) is not implemented in this specific variant.

Can DS1706EUA+ monitor a 3.3 V supply?

No, the DS1706EUA+ is specified exclusively for 5.0 V ±10% systems (VCCTP = 4.25–4.50 V). To monitor 3.3 V supplies, use DS1706TEUA+ (3.3 V ±5%) or DS1706SEUA+ (3.3 V ±10%). Attempting to use DS1706EUA+ on a 3.3 V rail would result in continuous reset assertion since VCC remains below its 4.25 V minimum trip point.

How does the watchdog timer in DS1706EUA+ interact with the reset function?

The DS1706EUA+ watchdog timer starts timing only after RST becomes inactive (i.e., after power-up stabilization). If the ST input is not strobed low within 1.0–2.2 s, WDS goes low for ≥130 ms-but this does not directly assert RST. RST is controlled solely by VCC level and PBRST. WDS serves as a diagnostic flag; designers may route it to PBRST or NMI to trigger secondary actions, but DS1706EUA+ itself does not auto-assert reset on watchdog timeout.

Is DS1706EUA+ pin-compatible with other MicroMonitor devices?

Yes, DS1706EUA+ is pin-compatible with the MAX705/MAX706 family in 8-pin µSOP, SOIC, and DIP packages per Maxim's documentation. Pin assignments (PBRST, VCC, GND, IN, NMI, ST, RST, WDS) match exactly across DS1705/DS1706 variants and MAX705/MAX706. However, functional differences exist-e.g., MAX706 lacks IN and NMI pins-so electrical compatibility requires verifying feature-level requirements against the target application.