Analog Devices Inc./Maxim Integrated DS1708EUA

Overview

DS1708EUA from Maxim Integrated is a 5.0V ±10% microprocessor supervisory circuit that monitors VCC, senses external voltage via IN pin, and debounces pushbutton reset input (PBRST). It delivers active-low and active-high reset outputs (RST and RST), generates non-maskable interrupt (NMI) on early power failure detection, and operates across -40°C to +85°C. Used in embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the DS1708EUA datasheet, DS1708EUA pinout, DS1708EUA application, or DS1708EUA equivalent, key selection criteria include its 5V-10% VCC trip point (4.25V–4.50V), 130ms minimum reset pulse width, NMI early-warning capability with 1.25V IN threshold, and µSOP-8 (118-mil) package compatibility with space-constrained industrial controllers.

Technical Context

The DS1708EUA implements dual-voltage monitoring: internal VCC comparator triggers reset when supply falls below 4.25V (min), while high-impedance IN pin accepts user-defined sense points via resistor divider for upstream power rail monitoring. Its bandgap-referenced 1.25V threshold enables precise early-warning NMI generation before VCC collapse.

Reset timing is deterministic: both RST and RST remain active ≥130ms after VCC recovery or PBRST release, with 5µs propagation delay from VCC drop to reset assertion. The device integrates internal 40kΩ pull-up on PBRST and built-in hysteresis (100µV) on NMI to reject noise-induced false interrupts.

Key Specifications

Pinout & Package

DS1708EUA is housed in an 8-pin µSOP package (118-mil width, JEDEC MO-187AA), pin-compatible with MAX707/MAX708 in same footprint. Pin assignments are identical across DS1707/DS1708 variants per mechanical drawings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708ESA and TPS3808G12DBVR, DS1708EUA uniquely combines 5V-specific ±10% monitoring, integrated NMI for predictive shutdown, and dual RST outputs - making it optimal for systems where deterministic reset timing and early power-fail response are mandatory.

Availability

DS1708EUA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom remote terminal units, and smart energy meters requiring stable component supply and long-term lifecycle support.

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 DS1707/DS1708 family was engineered specifically for robust microprocessor supervision in harsh environments, emphasizing deterministic reset timing, noise-immune voltage monitoring, and early-warning interrupt capability.

FAQ

What is the exact 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, corresponding to a 5V nominal supply with ±10% tolerance. This specification is validated per Maxim's DS1707/DS1708 datasheet Rev. 0, page 7, and applies specifically to the DS1708 variant in all packages including DS1708EUA. The trip point is temperature-compensated using an internal bandgap reference to maintain accuracy across the full operating range.

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

Yes, DS1708EUA provides two independent reset outputs: RST (active-low, open-drain) and RST (active-high, push-pull). This dual-output architecture eliminates the need for external inverters or pull-up resistors in most microprocessor interfaces. The RST output can directly drive standard CMOS reset inputs, while RST supports direct connection to processors requiring active-high assertion - both outputs are asserted simultaneously for ≥130ms during power-up or pushbutton event.

Can DS1708EUA monitor voltages other than 5V?

Yes, DS1708EUA can monitor external voltage rails beyond 5V using its IN pin, which features a fixed 1.25V threshold (1.20V–1.30V). By connecting a resistor divider between the target rail and GND, users configure custom trip points - for example, a 12V rail monitored at 11.88V max using R1=26kΩ and R2=10kΩ. The IN pin is high-impedance and requires the monitored voltage to stay ≤VCC; thus, higher rails must be scaled down before connection.

What is the function of the NMI output on DS1708EUA?

The NMI (non-maskable interrupt) output on DS1708EUA provides early warning of impending power failure by pulsing low ≥200µs when the IN pin voltage drops below 1.25V. Unlike RST, which activates only after VCC collapse, NMI triggers first - giving the microprocessor time to execute critical tasks like saving volatile data or entering safe mode. Its built-in 100µV hysteresis and 5µs noise immunity prevent false interrupts from supply ripple.

Is DS1708EUA pin-compatible with MAX707/MAX708?

Yes, DS1708EUA is pin-compatible with MAX707 and MAX708 in the same 8-pin µSOP package (118-mil), as confirmed in the "Pin compatible with the MAXIM MAX707/MAX708" feature statement and mechanical drawings referenced in the datasheet. All eight pins - PBRST, VCC, GND, IN, RST, RST, NC, and NMI - match functionally and physically, enabling drop-in replacement without PCB modification.