Analog Devices Inc./Maxim Integrated DS1706EPA+

Overview

DS1706EPA+ from Maxim Integrated is a 5V ±10% precision microprocessor supervisory circuit that monitors VCC, provides pushbutton reset control, and implements a 1-second watchdog timer with NMI early-warning interrupt. It delivers active-low reset (RST), watchdog status (WDS), and non-maskable interrupt (NMI) outputs in an 8-pin PDIP package for industrial embedded systems requiring reliable power-up sequencing and fault recovery.

For engineers reviewing the DS1706EPA+ datasheet, DS1706EPA+ pinout, DS1706EPA+ application, or DS1706EPA+ equivalent, this page details its VCC trip point (4.25–4.50 V), 130 ms minimum reset pulse width, 1.25 V IN-sense reference, -40°C to +85°C operation, and pin compatibility with MAX705/MAX706 - all critical for microcontroller-based power monitoring and fail-safe restart design.

Technical Context

The DS1706EPA+ integrates three independent monitoring functions: a precision bandgap-referenced VCC comparator with 4.25–4.50 V trip range, a debounced pushbutton reset input (PBRST) guaranteeing ≥130 ms RST assertion, and a 1.0–2.2 s watchdog timer triggered by ST strobe edges. All functions operate across 1.2–5.5 V supply and feature internal pull-ups on PBRST (40 kΩ) and ST (180 kΩ).

Its dual reset architecture supports both power-fail detection (via VCC sensing) and upstream supply monitoring (via IN pin with user-defined voltage divider), while NMI generation occurs at 200 µs pulse width with 100 µV hysteresis and 5 µs noise immunity - enabling deterministic system shutdown before full reset activation.

Key Specifications

Pinout & Package

DS1706EPA+ is housed in an 8-pin plastic DIP (300-mil) package with through-hole mounting and RoHS-compliant lead-free finish (+ suffix). Pin layout follows standard industry orientation with Pin 1 marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706ESA+, DS1706EPA+ offers identical supervision functionality in through-hole form factor; versus TPS3808G12DBVR, DS1706EPA+ provides critical NMI signaling and configurable voltage sensing - essential for systems needing layered fault response and multi-rail monitoring.

Availability

DS1706EPA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, telecom base station cards, and automotive telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS1706EPA+ 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 high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.

The DS1706EPA+ belongs to the MicroMonitor™ family - engineered specifically for robust microprocessor supervision in harsh environments where power integrity and software reliability are mission-critical.

FAQ

What is the exact VCC trip point range for DS1706EPA+?

The DS1706EPA+ has a guaranteed VCC trip point range of 4.25 V to 4.50 V, corresponding to ±10% tolerance around a nominal 5.0 V supply. This specification is tested and validated across the full -40°C to +85°C operating temperature range and ensures reliable reset activation before microprocessor operational failure. The DS1706EPA+ uses an internal temperature-compensated bandgap reference to maintain accuracy without external calibration.

Does DS1706EPA+ support both active-low and active-high reset outputs?

No, DS1706EPA+ provides only an active-low reset output (RST). The datasheet confirms RST is open-drain and active-low; the *RST (active-high) variant is exclusive to DS1706L and DS1706P versions. DS1706EPA+ does not include *RST functionality - its reset architecture relies solely on RST assertion for processor halt and recovery sequencing.

Can DS1706EPA+ monitor voltages other than VCC?

Yes, DS1706EPA+ can monitor external voltages via its IN pin, which features a precise 1.25 V internal reference and high-impedance input. By connecting a resistor divider between the target supply and ground, users configure the trip point - for example, a 4.5 V monitored rail requires R1 = 26 kΩ and R2 = 10 kΩ. The IN pin must never exceed VCC, and proper divider design ensures accurate early-warning NMI generation before VCC dropout.

What is the watchdog timeout behavior of DS1706EPA+?

The DS1706EPA+ watchdog timer times out between 1.0 s and 2.2 s after the last ST input edge, with typical timeout at 1.6 s. Upon timeout, WDS asserts low for ≥130 ms. The timer starts counting only after RST becomes inactive (i.e., after power-up stabilization), and each high-to-low ST transition resets the counter. This behavior ensures software liveliness checks occur during normal operation - not during reset recovery - preventing spurious timeouts.

Is DS1706EPA+ pin-compatible with MAX705/MAX706?

Yes, DS1706EPA+ is explicitly documented as pin-compatible with MAX705 and MAX706 in all supported packages - including 8-pin DIP (P), SOIC (S), and µSOP (U). Pin assignments, electrical characteristics, and functional behavior match identically across these devices, enabling direct substitution without layout changes. This compatibility extends to both schematic symbol and PCB footprint, simplifying second-source qualification and legacy design refresh.