Analog Devices Inc./Maxim Integrated DS1706EPA

Overview

DS1706EPA from Maxim Integrated is a 5.0V ±10% 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), non-maskable interrupt (NMI), and watchdog status (WDS) 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 precise reset threshold (4.25V–4.50V), 130ms minimum reset pulse width, 1s watchdog timeout, -40°C to +85°C operation, and compatibility with 5V microprocessor systems where deterministic power-fail response and software execution monitoring are critical.

Technical Context

The DS1706EPA integrates three independent monitoring functions: precision VCC detection using an internal bandgap reference and comparator (VCCTP = 4.25V–4.50V), debounced pushbutton reset with guaranteed 130ms active-low output, and a watchdog timer triggered by ST input transitions with 1.0–2.2s timeout range. All functions operate over full industrial temperature range without external components.

Its IN pin enables user-defined voltage sensing at upstream points via resistor divider (VTP = 1.25V ±0.05V), while NMI asserts for ≥200μs upon trip detection with 100μV hysteresis and noise immunity against <2μs transients. RST remains active for ≥130ms after VCC recovery to ensure processor stabilization.

Key Specifications

Pinout & Package

DS1706EPA is housed in an 8-pin plastic DIP (300-mil) package with through-hole mounting and industry-standard footprint. Pin assignments are electrically identical across DS1705/DS1706 family variants in this package type.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706ESA and TPS3823DBVR, DS1706EPA uniquely combines ±10% 5V reset, NMI early-warning, and 1s watchdog in one PDIP package-making it optimal for industrial systems requiring coordinated fault response without layout redesign.

Availability

DS1706EPA is available at Aetrix Electronics and suitable for industrial automation, medical device, telecom infrastructure, and smart energy metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.

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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The DS1706EPA belongs to the MicroMonitor™ family-designed specifically for robust microprocessor supervision in harsh environments where deterministic power-fail response, pushbutton reset reliability, and watchdog-based software execution assurance are mandatory.

FAQ

What is the exact VCC reset threshold range for DS1706EPA?

The DS1706EPA has a factory-trimmed VCC trip point (VCCTP) ranging from 4.25V to 4.50V, corresponding to ±10% tolerance around 5.0V nominal supply. This specification is validated across -40°C to +85°C and ensures reset assertion occurs before most 5V microcontrollers enter undefined operational states. The DS1706EPA datasheet confirms this range under DC Electrical Characteristics.

Does DS1706EPA provide both active-high and active-low reset outputs?

No, DS1706EPA provides only an active-low reset output (RST). The variant DS1706LEPA offers active-high RST, while DS1706EPA's marking "/RST" in the ordering table explicitly denotes active-low polarity. Its RST pin is open-drain and requires an external pull-up resistor to VCC for proper logic level translation.

How does the watchdog timer in DS1706EPA function, and what is its timeout window?

The DS1706EPA watchdog timer starts counting after RST becomes inactive and times out if the ST input is not strobed with a high-to-low transition within 1.0–2.2 seconds. Upon timeout, WDS asserts low for ≥130ms. This window accommodates typical microcontroller instruction cycles and allows firmware to service the watchdog without tight timing constraints.

Can DS1706EPA monitor voltages other than its own VCC supply?

Yes, DS1706EPA can monitor external supplies via its IN pin, which trips at a fixed 1.20V–1.30V threshold. By connecting a resistor divider between the target supply and GND-with the midpoint fed to IN-the device detects out-of-tolerance conditions on higher-voltage rails (e.g., 12V, 24V) while maintaining isolation and precision.

Is DS1706EPA pin-compatible with other members of the DS1705/DS1706 family?

Yes, DS1706EPA shares identical pinout and package dimensions with all DS1705/DS1706 variants in 8-pin PDIP (300-mil), including DS1705EPA and DS1706LEPA. This allows direct substitution in existing layouts when changing reset threshold or output polarity, provided the application's electrical requirements (e.g., NMI usage, RST polarity) remain compatible.