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. It delivers active-low reset (RST), non-maskable interrupt (NMI), and watchdog status (WDS) outputs in an 8-pin µSOP package, operating across –40°C to +85°C for industrial embedded systems requiring reliable power-up sequencing and fault recovery.

For engineers reviewing the DS1706EUA datasheet, DS1706EUA pinout, DS1706EUA application, or DS1706EUA equivalent, this page details its precise reset threshold (4.25V–4.50V), 130ms minimum reset pulse width, 1s watchdog timeout, NMI early-warning capability, and compatibility with 5V microprocessor systems needing robust power-fail detection and manual reset debouncing.

Technical Context

The DS1706EUA integrates three independent monitoring functions: a precision voltage comparator for VCC supervision with 4.25V–4.50V trip point, a debounced pushbutton reset input (PBRST) guaranteeing ≥130ms RST assertion, and a strobe-triggered watchdog timer with 1.0–2.2s timeout. All functions operate within a single 8-pin µSOP footprint without external components.

Its IN pin enables user-configurable voltage sensing via resistor divider for upstream supply monitoring, while NMI provides early warning at 1.25V threshold with 100µV hysteresis and 200µs pulse width. The device asserts RST during power-down and holds it active ≥130ms after power-up to ensure processor stabilization.

Key Specifications

Pinout & Package

DS1706EUA uses an 8-pin µSOP (118-mil) package with exposed pad for thermal performance and compact layout. Pin numbering follows standard SOIC/SOP orientation (pin 1 top-left, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706ESA and TPS3808G15DBVR, the DS1706EUA uniquely combines VCC monitoring, pushbutton reset debouncing, and a strobe-controlled watchdog in one µSOP package-with dedicated IN and NMI pins enabling early fault detection and graceful shutdown not available in either alternative.

Availability

DS1706EUA is available at Aetrix Electronics and suitable for industrial PLC control, medical diagnostic equipment, automotive infotainment head units, and network edge router modules requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.

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 industrial, medical, and communications applications.

The DS1706EUA belongs to the MicroMonitor family-engineered specifically for microprocessor-based systems needing coordinated power-up sequencing, brownout protection, and software hang detection in compact form factors.

FAQ

What is the exact VCC trip point range for DS1706EUA?

The DS1706EUA has a specified VCC trip point range of 4.25V to 4.50V, corresponding to ±10% tolerance for 5.0V systems. This is confirmed in the DC Electrical Characteristics table of the official datasheet, where VCCTP for DS1706 is explicitly listed as min=4.25V, typ=4.40V, max=4.50V. The DS1706EUA is the 5V-10% version in µSOP packaging, and this trip point applies directly to the DS1706EUA.

Does DS1706EUA provide both active-high and active-low reset outputs?

No, the DS1706EUA provides only an active-low reset output (RST). The datasheet clearly states that DS1706 variants with "EUA" suffix-including DS1706EUA-are configured for /RST (active-low) and /WDS (active-low) outputs. Active-high reset (*RST) is available only on DS1706L and DS1706P variants, not on DS1706EUA.

Can DS1706EUA monitor voltages other than its own VCC supply?

Yes, DS1706EUA can monitor external voltages via its IN pin, which has a fixed 1.25V threshold. By connecting a resistor divider between the target supply and GND, users configure the trip point-for example, a 4.5V supply monitored with R1=26kΩ and R2=10kΩ per the datasheet equation. This allows early NMI generation from upstream rails before VCC itself fails, a key feature of the DS1706EUA.

What is the watchdog timeout accuracy and how is it triggered?

The DS1706EUA watchdog timeout is 1.0–2.2s, with typical value 1.6s. It starts counting when RST becomes inactive (i.e., after power-up stabilization), and resets on each high-to-low transition at the ST pin. If ST is not strobed within the timeout window, WDS goes active-low for ≥130ms. This behavior is verified in the AC Electrical Characteristics table and Operation section of the DS1706EUA datasheet.

Is DS1706EUA pin-compatible with other packages in the same family?

Yes, DS1706EUA is pin-compatible with DS1706EPA (DIP) and DS1706ESA (SOIC) - all share identical 8-pin assignments and electrical functionality. The datasheet explicitly states "Pin-compatible with the MAXIM MAX705/MAX706 in 8-pin DIP, 8-pin SOIC, and -SOP", and the Pin Assignment diagram confirms matching pin roles across all three packages. This allows drop-in replacement across form factors without layout changes.