Analog Devices Inc./Maxim Integrated DS1708SEUA

Overview

DS1708SEUA from Maxim Integrated is a 3.3V ±10% supply voltage supervisor IC with dual active-high/active-low reset outputs, non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC and an external sense point (IN), delivers 130ms minimum reset pulse width, and operates across -40°C to +85°C for industrial microprocessor power management.

For engineers reviewing the DS1708SEUA datasheet, DS1708SEUA pinout, DS1708SEUA application, or DS1708SEUA equivalent, key selection criteria include its 3.3V ±10% VCC trip point (2.93V–3.00V), dual RST outputs, NMI early-warning capability, and µSOP-8 package compatibility with board space-constrained embedded systems.

Technical Context

The DS1708SEUA implements a precision bandgap-referenced comparator architecture to monitor both local VCC (trip point 2.93V–3.00V) and an external voltage via high-impedance IN pin (1.25V threshold). Its internal power-fail detection triggers RST/RST after VCC decay and holds reset active ≥130ms on power-up.

It integrates pushbutton reset debouncing with guaranteed 130ms output pulse width upon PBRST release, and generates a 200µs NMI pulse with 100µV hysteresis when the IN-sensed supply falls below threshold - enabling system-level shutdown coordination before full reset assertion.

Key Specifications

Pinout & Package

DS1708SEUA is housed in an 8-pin µSOP (118-mil) package with exposed pad (non-electrical), optimized for thermal performance and board density.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX708TESA and TPS3808G33DBVR, the DS1708SEUA uniquely combines 3.3V ±10% supervision, dual RST outputs, NMI early warning, and hardware pushbutton reset in a single µSOP-8 device - making it optimal for industrial and medical systems requiring coordinated power-fail response without external logic.

Availability

DS1708SEUA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom radio units, and automotive infotainment head units requiring stable component supply and long-term lifecycle support.

Supply support for DS1708SEUA 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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS1707/DS1708 MicroMonitor product line was designed specifically for robust microprocessor power supervision in mission-critical embedded systems - delivering simultaneous VCC monitoring, external voltage sensing, and hardware reset control in minimal footprint.

FAQ

What is the exact VCC trip point range for DS1708SEUA?

The DS1708SEUA has a guaranteed VCC trip point range of 2.93V to 3.00V, corresponding to 3.3V ±10% monitoring. This specification is validated across the full -40°C to +85°C operating temperature range and ensures reliable reset assertion during 3.3V supply undervoltage conditions. The DS1708SEUA's trip window is distinct from other variants like DS1708TEUA (±5%) or DS1708REUA (±20%).

Does DS1708SEUA provide both active-high and active-low reset outputs?

Yes, the DS1708SEUA provides two independent reset outputs: RST (active-high CMOS) and RST (active-low open-drain). This dual-output architecture allows direct connection to microprocessors requiring either polarity, supports wired-OR reset buses via the open-drain RST, and eliminates need for external inverters. Both outputs are asserted simultaneously and held active for ≥130ms during power-up or fault conditions.

How does the NMI function work in DS1708SEUA?

The DS1708SEUA's NMI output pulses low for ≥200µs when the voltage at the IN pin falls below its 1.25V threshold - providing early warning of upstream power degradation. It features 100µV hysteresis and requires the IN signal to remain below threshold for ~5µs before asserting, rejecting noise. The DS1708SEUA's NMI can be connected to PBRST to auto-trigger reset, enabling cascaded power-fail response without software intervention.

Is DS1708SEUA pin-compatible with MAX707/MAX708 devices?

Yes, the DS1708SEUA is pin-compatible with the MAX707 and MAX708 in the 8-pin µSOP (118-mil) package, sharing identical pin assignments, electrical behavior, and functional capabilities. This allows direct substitution in existing designs using MAX707ESA/MAX708ESA footprints. The DS1708SEUA maintains full functional equivalence including dual RST outputs, NMI, and PBRST debounce - with no PCB changes required.

What is the recommended external circuit for the IN pin of DS1708SEUA?

The DS1708SEUA's IN pin requires a resistor voltage divider to scale higher voltages down to its 1.25V threshold. For example, to monitor a 4.50V supply, use R1 = 26kΩ and R2 = 10kΩ (per datasheet Figure 5). The DS1708SEUA's IN input is high-impedance (<1µA leakage), so divider current should be minimized; R2 ≥10kΩ is recommended to limit power consumption while maintaining noise immunity and accuracy.