Analog Devices Inc./Maxim Integrated DS1706PEUA+

Overview

DS1706PEUA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-high reset output (RST), watchdog timer, non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC for 20% tolerance (trip point 2.55V–2.70V), provides 130ms minimum reset pulse width, and operates across –40°C to +85°C in 8-pin µSOP. Used in embedded systems requiring reliable power-up/power-down sequencing and software fault recovery.

For engineers reviewing the DS1706PEUA+ datasheet, DS1706PEUA+ pinout, DS1706PEUA+ application, or DS1706PEUA+ equivalent, key selection criteria include its 3.3V/20% VCC threshold, RST (active-high) output logic, 1-second watchdog timeout, NMI early-warning capability, and compatibility with µSOP-8 footprint for space-constrained industrial controllers.

Technical Context

The DS1706PEUA+ integrates three independent monitoring functions: precision VCC detection using an internal bandgap reference and comparator (VCCTP = 2.55–2.70V), a 1-second watchdog timer triggered by ST input transitions, and a debounced PBRST input generating ≥130ms RST pulses. Its IN pin supports external voltage sensing at 1.25V trip point with hysteresis.

It delivers dual-reset signaling: RST (active-high) and WDS (active-low watchdog status), while NMI provides early power-fail warning with 200µs pulse width and 5µs noise immunity. All I/O pins feature internal pull-ups (PBRST: 40kΩ typ; ST: 180kΩ typ), and operation is guaranteed from 1.2V to 5.5V supply.

Key Specifications

Pinout & Package

DS1706PEUA+ is housed in an 8-pin µSOP (118-mil) package, RoHS-compliant and lead(Pb)-free, with 0.5mm pitch and exposed pad for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706PEPA+, DS1706PEUA+ offers identical supervision functionality in a smaller µSOP package ideal for density-constrained boards; versus TPS3808G33DBVR, DS1706PEUA+ provides NMI for predictive failure handling but trades threshold accuracy for broader tolerance and system robustness.

Availability

DS1706PEUA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, telecom remote radio units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS1706PEUA+ 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, communications, and computing applications.

The DS1706PEUA+ belongs to the MicroMonitor™ family-engineered specifically for microprocessor system supervision, combining VCC monitoring, watchdog timing, and non-maskable interrupt generation in single-chip solutions for mission-critical embedded systems.

FAQ

What is the exact VCC trip point range for DS1706PEUA+?

The DS1706PEUA+ has a guaranteed VCC trip point range of 2.55V to 2.70V, corresponding to 20% tolerance around a nominal 3.3V supply. This specification is validated across the full industrial temperature range (–40°C to +85°C) and ensures reliable brownout detection in 3.0V–3.3V systems. The DS1706PEUA+ datasheet explicitly defines this range under DC Electrical Characteristics.

Does DS1706PEUA+ provide both active-high and active-low reset outputs?

No, DS1706PEUA+ provides only an active-high reset output (RST). The "P" suffix in DS1706PEUA+ denotes the RST variant (as confirmed in the Ordering Information table), distinguishing it from /RST variants like DS1706EUA+. WDS is active-low but serves as a watchdog status indicator-not a system reset signal. DS1706PEUA+ does not include /RST.

How is the watchdog timeout period set for DS1706PEUA+?

The DS1706PEUA+ watchdog timeout is fixed at 1.0–2.2 seconds and is not user-adjustable. It resets on each high-to-low transition of the ST (strobe) input. If ST remains inactive beyond the timeout, WDS asserts low for ≥130ms. The timeout is factory-trimmed and specified in the AC Electrical Characteristics table; no external components or configuration registers modify it.

Can DS1706PEUA+ monitor voltages other than VCC?

Yes, DS1706PEUA+ can monitor external voltages via the IN pin, which has a fixed 1.25V trip point. By connecting a resistor divider between the target supply and GND, users scale higher voltages (e.g., 5V, 12V) down to 1.25V at IN. The DS1706PEUA+ datasheet provides the exact equation (VSENSE = R2/(R1+R2) × 1.25V) and constraints (e.g., VMAX = VSENSE × VCC / 1.25V) to ensure safe operation.

What package type and RoHS status does DS1706PEUA+ use?

DS1706PEUA+ uses an 8-pin µSOP (U8-1 package, 118-mil width, 0.5mm pitch) and is RoHS-compliant and lead(Pb)-free, as indicated by the "+" suffix per Maxim's ordering convention. The package drawing is documented in Maxim package document 21-0036, and the "+" confirms compliance with EU RoHS Directive 2011/65/EU.