Analog Devices Inc./Maxim Integrated DS1706TEUA

Overview

DS1706TEUA from Maxim Integrated is a 3.3V ±5% precision voltage supervisor IC with watchdog timer, non-maskable interrupt (NMI), and pushbutton reset control - designed for microprocessor power monitoring in embedded systems. It delivers 130 ms minimum active-low reset pulse, 1.0 s watchdog timeout, and 1.25 V input trip point on the IN pin, operating across -40°C to +85°C.

For engineers reviewing the DS1706TEUA datasheet, DS1706TEUA pinout, DS1706TEUA application, or DS1706TEUA equivalent, key selection criteria include VCC trip accuracy (4.25–4.50 V), RST timing consistency (130–285 ms), WDS watchdog status signaling, and compatibility with 3.3V logic-level microcontrollers requiring early power-fail warning and reliable cold/warm reset sequencing.

Technical Context

The DS1706TEUA integrates three independent monitoring functions: (1) VCC supply supervision with 4.25–4.50 V trip threshold and 130 ms reset hold time; (2) high-impedance IN pin sensing at 1.25 V reference for external voltage monitoring with 100 µV hysteresis; (3) ST-input-driven watchdog timer with 1.0–2.2 s timeout and WDS active-low status output.

It supports dual reset outputs (RST active-low only, no *RST), debounces PBRST inputs, and generates NMI pulses ≥200 ns upon IN voltage decay - all while consuming ≤60 µA at VCC < 5.5 V. The device operates without external components beyond optional resistor dividers for IN sensing.

Key Specifications

Pinout & Package

DS1706TEUA is housed in an 8-pin µSOP (118-mil) package with gull-wing leads, 0.5 mm pitch, and JEDEC MO-187AC compliance. Pin 1 marked by dot; exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and watchdog applications.

Compared with MAX6326UT43D3+ and TPS3808G33DBVR, DS1706TEUA uniquely combines ±5% VCC supervision, external IN sensing, NMI early warning, and integrated watchdog - making it the only single-chip solution for systems requiring coordinated power-fail response, graceful shutdown, and runtime crash detection.

Availability

DS1706TEUA is available at Aetrix Electronics and suitable for industrial automation controllers, medical diagnostics equipment, telecom remote terminals, and automotive infotainment gateways requiring stable component supply and long-term lifecycle assurance.

Supply support for DS1706TEUA 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 demanding industrial, medical, and communications applications.

The DS1706TEUA belongs to the MicroMonitor™ family - engineered specifically for robust microprocessor supervision in environments with noisy power rails, wide temperature swings, and stringent reliability requirements.

FAQ

What is the exact VCC reset threshold range for DS1706TEUA?

The DS1706TEUA has a guaranteed VCC trip point of 4.25 V (min) to 4.50 V (max) at -40°C to +85°C. This ±5% tolerance around 4.375 V nominal is specified for 3.3V system monitoring and ensures reset assertion occurs before downstream logic becomes unreliable. DS1706TEUA maintains this threshold stability across its full industrial temperature range without external calibration.

Does DS1706TEUA support both active-high and active-low reset outputs?

No, DS1706TEUA provides only an active-low reset output (RST). Unlike variants such as DS1706LEUA or DS1706PEUA, the DS1706TEUA does not include the *RST (active-high) output. Its RST pin is open-drain and requires an external pull-up resistor to VCC or another logic rail to generate a valid reset signal for the target microprocessor.

How does the IN pin function in DS1706TEUA, and what is its trip voltage?

The IN pin on DS1706TEUA is a high-impedance input referenced to an internal 1.25 V bandgap comparator, with a trip range of 1.20–1.30 V. It enables monitoring of external supplies (e.g., 5V, 12V, or 48V rails) using a resistor divider. When the divided voltage falls below the trip point, DS1706TEUA asserts NMI first, then RST if the condition persists - providing staged fault response.

What is the watchdog timeout behavior of DS1706TEUA, and how is it triggered?

DS1706TEUA features a 1.0–2.2 s watchdog timeout that begins counting after RST goes inactive. It is reset by any high-to-low transition on the ST pin. If ST is not strobed within the timeout window, WDS is driven low for ≥130 ms. This behavior allows DS1706TEUA to detect firmware hangs even when the main CPU clock remains active but software execution stalls.

Is DS1706TEUA pin-compatible with other members of the DS1705/DS1706 family?

Yes, DS1706TEUA shares identical 8-pin µSOP (118-mil) pinout and footprint with all DS1705/DS1706 variants, including DS1706ESA, DS1706LEUA, and DS1706REUA. Signal mapping (PBRST, VCC, GND, IN, WDS, RST, ST, NMI) is consistent across the family, enabling drop-in replacement where functional requirements align - though reset polarity and trip thresholds differ by suffix.