Analog Devices Inc./Maxim Integrated DS1708EUA+

Overview

DS1708EUA+ from Maxim Integrated is a 5.0V ±10% microprocessor supervisory circuit in an 8-pin µSOP package, providing active-low and active-high reset outputs (RST and RST), non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC for power failure, senses external voltage via high-impedance IN pin, and guarantees ≥130ms reset pulse width. Used in industrial embedded systems requiring reliable power-up/power-down sequencing and early warning of supply decay.

For engineers reviewing the DS1708EUA+ datasheet, DS1708EUA+ pinout, DS1708EUA+ application, or DS1708EUA+ equivalent, key selection criteria include VCC trip point (4.25V–4.50V), dual reset polarity support, NMI timing (≥200ns pulse, 5µs detection delay), and µSOP-8 thermal performance in -40°C to +85°C environments.

Technical Context

The DS1708EUA+ implements a precision bandgap-referenced comparator architecture to monitor VCC against a fixed 4.25V–4.50V threshold and the IN pin against a 1.20V–1.30V internal reference. Its dual-reset output stage drives both active-low (RST) and active-high (RST) signals with guaranteed 130–285ms assertion time during power-up and power-down events.

It integrates a 40kΩ internal pull-up on PBRST for pushbutton interface, debounces mechanical inputs, and generates a minimum 200ns NMI pulse with 5µs noise immunity hysteresis. The device operates across 1.2V–5.5V supply range but is specified for 5.0V ±10% monitoring with industrial temperature support.

Key Specifications

Pinout & Package

DS1708EUA+ uses an 8-pin µSOP (118-mil) package with exposed pad for thermal enhancement and compact board area usage.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708TESA+ and TPS3808G12DBVR, DS1708EUA+ uniquely delivers 5V ±10% monitoring with integrated NMI, dual-reset polarity, and pushbutton debouncing in a µSOP-8 package-enabling full-featured supervision without external components.

Availability

DS1708EUA+ is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and telecom infrastructure requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for DS1708EUA+ 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, automotive, and communications markets.

The DS1708EUA+ belongs to the MicroMonitor™ supervisory product line, engineered specifically for robust power-up validation, brownout detection, and fail-safe system reset in harsh industrial environments.

FAQ

What is the VCC trip point range for DS1708EUA+?

The DS1708EUA+ has a guaranteed VCC trip point range of 4.25V (minimum) to 4.50V (maximum) at -40°C to +85°C. This ±10% window around 4.375V nominal ensures reliable reset assertion before a 5V system enters unstable operating territory. The DS1708EUA+ datasheet specifies this tolerance explicitly for the DS1708 variant, distinguishing it from DS1707 (4.50V–4.75V) and DS1708T (3.00V–3.15V). DS1708EUA+ maintains this specification across its full industrial temperature range without derating.

Does DS1708EUA+ provide both active-high and active-low reset outputs?

Yes, DS1708EUA+ provides two independent reset outputs: RST (active-low) and RST (active-high), both asserted simultaneously during power-up, power-down, or pushbutton events. RST is open-drain and sinks up to 10mA, while RST is push-pull and sources up to 350µA. This dual-output architecture eliminates the need for external level-shifting or inversion circuitry in systems with mixed logic families. DS1708EUA+ guarantees ≥130ms minimum assertion time for both signals, ensuring processor and peripheral stability.

How does the NMI function work in DS1708EUA+?

The NMI output in DS1708EUA+ is triggered when the voltage at the IN pin falls below the internal 1.25V reference, indicating decay in a user-monitored supply rail. It pulses low for ≥200ns with built-in 5µs noise immunity hysteresis, preventing false interrupts from supply ripple. DS1708EUA+ allows connecting NMI to PBRST to auto-generate a full reset upon early warning-enabling firmware-controlled shutdown before VCC collapse. This behavior is confirmed in Figures 3 and 6 of the DS1708 datasheet.

Is DS1708EUA+ pin-compatible with MAX708 devices?

Yes, DS1708EUA+ is pin-compatible with MAX708 devices in the same 8-pin µSOP package, sharing identical pin assignments for RST, RST, PBRST, VCC, GND, IN, NC, and NMI. This compatibility is explicitly stated in the "Pin compatible with the MAXIM MAX707/MAX708" feature list and verified in the mechanical drawings section. DS1708EUA+ retains the same functional interface, timing behavior, and electrical characteristics required for drop-in replacement in existing MAX708-based designs.

What package type and dimensions does DS1708EUA+ use?

DS1708EUA+ uses an 8-pin µSOP (micro Small Outline Package) with 118-mil body width and 0.5mm lead pitch. Its compact 3.0mm × 3.0mm footprint and 0.8mm max height make it suitable for space-constrained industrial PCBs. The package includes an exposed thermal pad for improved heat dissipation and solderability. DS1708EUA+ ordering code "U" explicitly denotes µSOP, distinguishing it from DIP ("P") and SOIC ("S") variants in the Maxim ordering table.