Analog Devices Inc./Maxim Integrated DS1706SEUA

Overview

DS1706SEUA from Maxim Integrated is a 3.3V ±10% precision voltage supervisor IC with watchdog timer, non-maskable interrupt (NMI), and pushbutton reset control - designed for microprocessor system monitoring in industrial embedded applications. It delivers 130 ms minimum active-low reset pulse width, 1.0 s watchdog timeout, 1.25 V IN trip point, and operates across -40°C to +85°C.

For engineers reviewing the DS1706SEUA datasheet, DS1706SEUA pinout, DS1706SEUA application, or DS1706SEUA equivalent, key selection considerations include its 3.3V supply monitoring tolerance, /RST and /WDS active-low outputs, µSOP-8 package compatibility, and functional equivalence to MAX705/MAX706 in power-fail detection and reset sequencing.

Technical Context

The DS1706SEUA integrates three independent monitoring functions: (1) VCC supply supervision with 3.3V ±10% trip point (VCCTP = 2.93 V typical), (2) high-impedance IN pin sensing at 1.25 V reference for early power-fail warning via NMI, and (3) ST-input-triggered watchdog with 1.0–2.2 s timeout and WDS active-low status output.

Its reset logic ensures RST remains asserted for ≥130 ms after power-up or PBRST release, while internal debouncing and hysteresis (100 µV on NMI path) suppress noise-induced false triggers. The device uses bandgap-referenced comparators and requires no external components for basic operation.

Key Specifications

Pinout & Package

DS1706SEUA is housed in an 8-pin µSOP (118-mil body width) package, pin-compatible with DS1706 variants in DIP and SOIC footprints. All pins are CMOS-compatible with internal pull-ups on PBRST (40 kΩ) and ST (180 kΩ).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with DS1706SEUA, MAX706ESA serves 5V domains with identical supervision architecture but incompatible trip voltage, while TPS3808G12DBVR offers higher accuracy in a smaller package but omits dual-alerting and watchdog features - making DS1706SEUA the optimal choice for integrated 3.3V system health monitoring.

Availability

DS1706SEUA is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant µSOP packaging.

Supply support for DS1706SEUA 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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and communications markets.

The DS1706SEUA belongs to the MicroMonitor™ family - engineered specifically for robust, multi-function microprocessor supervision in space-constrained, mission-critical embedded systems.

FAQ

What is the exact VCC trip point specification for DS1706SEUA?

The DS1706SEUA has a guaranteed VCC trip point (VCCTP) of 2.85 V (min), 2.93 V (typ), and 3.00 V (max) - corresponding to 3.3V ±10% monitoring. This threshold is factory-trimmed and temperature-compensated using an internal bandgap reference, ensuring consistent reset assertion across the full -40°C to +85°C operating range. DS1706SEUA maintains this specification without external calibration.

Does DS1706SEUA support both active-high and active-low reset outputs?

No, DS1706SEUA provides only an active-low reset output (/RST). The datasheet confirms it is configured as a /RST, /WDS variant - meaning both reset and watchdog status outputs are active-low open-drain signals. For active-high reset, designers must select DS1706LEUA (RST, /WDS) or DS1706PEUA (RST, /WDS), as DS1706SEUA does not include the *RST pin.

How is the watchdog timeout period determined for DS1706SEUA?

The DS1706SEUA watchdog timeout is fixed at 1.0–2.2 seconds, with a typical value of 1.6 s. It is not user-adjustable via external components. The timer starts counting when /RST becomes inactive (i.e., after power-up stabilization), and resets on each high-to-low transition at the ST pin. If ST remains high beyond the timeout, WDS asserts low for ≥130 ms - a behavior confirmed in the AC Electrical Characteristics table.

Can DS1706SEUA monitor voltages other than VCC using the IN pin?

Yes, DS1706SEUA's IN pin is a high-impedance (≤1 µA) input referenced to a precise 1.25 V internal bandgap. By connecting an external resistor divider between a higher-voltage rail (e.g., 5V, 12V) and GND, users can scale that voltage to 1.25 V at IN to trigger NMI prior to VCC collapse. The datasheet provides the exact formula (VSENSE = R2/(R1+R2) × 1.25 V) and example calculations for safe implementation.

Is DS1706SEUA pin-compatible with MAX705/MAX706 devices?

Yes, DS1706SEUA is explicitly documented as pin-compatible with MAX705/MAX706 in 8-pin DIP, SOIC, and µSOP packages. Its pin assignment (PBRST, VCC, GND, IN, NMI, ST, /RST, /WDS) matches the MAX706 footprint exactly, enabling direct substitution in existing designs - provided the 3.3V ±10% trip point meets system requirements. No PCB layout changes are needed for replacement.