Analog Devices Inc./Maxim Integrated DS1707EPA

Overview

DS1707EPA from Maxim Integrated is a 5V ±5% microprocessor supervisory circuit that monitors VCC, senses external voltage via IN pin, and debounces pushbutton reset input. It delivers active-low and active-high reset outputs (RST and RST), non-maskable interrupt (NMI), and operates across -40°C to +85°C. Used in embedded systems requiring reliable power-up sequencing and early power-fail warning.

For engineers reviewing the DS1707EPA datasheet, DS1707EPA pinout, DS1707EPA application, or DS1707EPA equivalent, key selection considerations include its dual-reset output polarity, 130 ms minimum reset pulse width, 1.25 V internal reference for voltage sensing, and compatibility with 5V microprocessor supply rails.

Technical Context

The DS1707EPA integrates three independent monitoring functions: VCC threshold detection (4.50–4.75 V trip), high-impedance IN-pin voltage sensing referenced to 1.25 V, and PBRST debounced pushbutton interface. Its dual RST outputs enable direct connection to both active-low and active-high reset inputs on legacy or mixed-logic microcontrollers.

It generates a 200 µs NMI pulse upon voltage decay at IN, with 100 µV hysteresis and 5 µs noise immunity, and holds reset active for ≥130 ms after VCC recovery. The device uses an internal bandgap reference and comparator architecture, eliminating external components for basic supervision tasks.

Key Specifications

Pinout & Package

DS1707EPA is housed in an 8-pin plastic DIP (300-mil) package with through-hole mounting and industry-standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX707CPA and TPS3808G33DBVR, DS1707EPA uniquely combines VCC supervision, user-defined voltage sensing (IN), NMI early warning, and dual-polarity reset in one 8-pin DIP-enabling robust, component-minimized supervision without layout redesign.

Availability

DS1707EPA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom base station cards, and automotive infotainment head units requiring stable component supply and long-term lifecycle support.

Supply support for DS1707EPA 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 DS1707EPA belongs to the MicroMonitor™ family of supervisory circuits, engineered specifically for deterministic power-up sequencing, brownout protection, and early power-fail response in microprocessor-based systems.

FAQ

What is the exact VCC trip voltage range for DS1707EPA?

The DS1707EPA has a guaranteed VCC trip point between 4.50 V (minimum) and 4.75 V (maximum) at -40°C to +85°C. This 5% tolerance window ensures reliable reset assertion before a nominal 5V supply falls outside specification, and is validated per Maxim's DS1707/DS1708 datasheet revision. DS1707EPA uses internal temperature-compensated bandgap reference to maintain accuracy across its full operating range.

Does DS1707EPA support monitoring voltages other than VCC?

Yes, DS1707EPA supports external voltage monitoring via its IN pin, which compares applied voltage against a precise 1.25 V internal reference. Using an external resistor divider, designers can configure DS1707EPA to supervise any DC rail - such as 3.3V, 2.5V, or 12V - with accuracy limited only by resistor tolerance and temperature drift. DS1707EPA's high-impedance IN input (≤1 µA leakage) ensures minimal loading on the divider network.

How does the pushbutton reset function work on DS1707EPA?

The PBRST pin on DS1707EPA accepts an active-low pushbutton signal, internally debounces it, and guarantees a minimum 130 ms reset pulse width on both RST and RST outputs. The timing starts when the button is released, not pressed. DS1707EPA includes a 40 kΩ internal pull-up on PBRST, eliminating the need for an external resistor. This integrated debounce prevents contact bounce from causing multiple or partial resets.

What is the purpose of the NMI output on DS1707EPA?

The NMI (non-maskable interrupt) output on DS1707EPA provides early warning of impending power failure by pulsing low for ≥200 µs when the IN pin voltage drops below 1.25 V. Unlike RST, NMI does not halt processor execution immediately - it allows firmware to execute critical shutdown routines (e.g., saving state, flushing buffers) before reset occurs. DS1707EPA includes 100 µV hysteresis and 5 µs noise immunity on the NMI path to prevent false triggers.

Is DS1707EPA pin-compatible with other supervisory ICs?

Yes, DS1707EPA is pin-compatible with the MAX707/MAX708 in 8-pin DIP and SOIC packages, sharing identical pin assignments for VCC, GND, PBRST, IN, RST, RST, NC, and NMI. This allows drop-in replacement in existing designs using those Maxim parts. DS1707EPA retains full functional compatibility including reset timing, NMI behavior, and pushbutton debounce - confirmed in Maxim's official documentation for DS1707/DS1708.