Analog Devices Inc./Maxim Integrated DS1706EUA+T&R

Overview

DS1706EUA+T&R 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 WDS output. It delivers active-low RST, NMI interrupt, and PBRST debouncing in an 8-pin µSOP package for embedded systems requiring reliable power-up/power-down sequencing and fault recovery. Used in industrial controllers and telecom line cards.

For engineers reviewing the DS1706EUA+T&R datasheet, DS1706EUA+T&R pinout, DS1706EUA+T&R application, or DS1706EUA+T&R equivalent, key selection criteria include VCC trip point (4.25–4.50 V), 130 ms minimum reset pulse width, 1 s watchdog timeout, NMI early-warning capability, and compatibility with 3.3V/5.0V logic interfaces.

Technical Context

The DS1706EUA+T&R integrates three independent monitoring functions: precision VCC detection using an internal bandgap reference and comparator (VCCTP = 4.25–4.50 V), pushbutton reset with hardware debouncing and guaranteed 130 ms active-low RST pulse, and a watchdog timer triggered by ST input transitions with 1.0–2.2 s timeout window.

Its NMI output asserts for ≥200 µs when IN voltage falls below 1.25 V (±50 mV), providing early power-fail warning before RST activation; the IN pin supports external voltage divider configuration for upstream supply monitoring, with built-in 100 µV hysteresis to reject noise.

Key Specifications

Pinout & Package

DS1706EUA+T&R is housed in an 8-pin µSOP (118-mil) package with exposed pad, compatible with standard SOIC reflow profiles and offering compact footprint for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706ESA+, DS1706EUA+T&R adds NMI and IN monitoring for proactive fault response; versus TPS3823DBVR, it provides full triple-function supervision in a standardized 8-pin µSOP, enabling feature-rich supervision without layout redesign.

Availability

DS1706EUA+T&R is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, medical diagnostics, and automotive infotainment systems requiring stable component supply and long-term lifecycle support.

Supply support for DS1706EUA+T&R 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 industrial, communications, and computing applications.

The DS1706EUA+T&R belongs to the MicroMonitor family-engineered specifically for robust microprocessor supervision in harsh environments requiring simultaneous power, software, and user-input monitoring.

FAQ

What is the exact VCC trip point range for DS1706EUA+T&R?

The DS1706EUA+T&R has a guaranteed VCC trip point range of 4.25 V to 4.50 V, corresponding to its 5.0V ±10% specification. This range is validated across –40°C to +85°C and ensures reliable reset assertion before system-level brownout. The DS1706EUA+T&R uses an internal temperature-compensated bandgap reference to maintain accuracy without external calibration.

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

No, DS1706EUA+T&R provides only an active-low reset output (RST). The datasheet confirms RST is push-pull and active-low; *RST (active-high) is exclusive to DS1706L and DS1706P variants. DS1706EUA+T&R does not include *RST functionality, and no internal configuration or external circuit can enable it.

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

The DS1706EUA+T&R 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 active-low for ≥130 ms-but this does not assert RST. RST remains controlled solely by VCC and PBRST events. The DS1706EUA+T&R treats watchdog timeout as a status signal (WDS), not a reset trigger, preserving separation of fault detection and system recovery.

Can DS1706EUA+T&R monitor a 12V supply directly?

No, DS1706EUA+T&R cannot monitor 12V directly-the IN pin must remain ≤VCC (max 5.5V). To supervise a 12V rail, use an external resistor divider to scale the voltage so IN sees ≤1.25 V at the trip point. For example, with R2 = 10 kΩ, R1 ≈ 26 kΩ yields ~4.5V sense at IN when VSENSE = 12V. DS1706EUA+T&R's IN input is high-impedance (≤1 µA), minimizing divider current draw.

Is DS1706EUA+T&R pin-compatible with MAX705/MAX706 devices?

Yes, DS1706EUA+T&R is explicitly documented as pin-compatible with MAX705/MAX706 in 8-pin DIP, SOIC, and µSOP packages. Pin assignments-including PBRST, VCC, GND, IN, NMI, ST, RST, and WDS-match identically. This allows direct replacement in existing designs using MAX705/MAX706, provided the DS1706EUA+T&R's 5V ±10% trip point meets system requirements.