Analog Devices Inc./Maxim Integrated DS1706LESA

Overview

DS1706LESA from Maxim Integrated is a 5.0V ±5% microprocessor supervisory circuit with active-high reset output (RST), watchdog status output (WDS), and non-maskable interrupt (NMI) for embedded systems. It monitors VCC, detects power transients, provides pushbutton reset debouncing, and delivers 130ms minimum reset pulse width. Used in industrial controllers requiring reliable power-up sequencing and fail-safe restart after brownout.

For engineers reviewing the DS1706LESA datasheet, DS1706LESA pinout, DS1706LESA application, or DS1706LESA equivalent, this page details its precise reset threshold (4.65V typ), watchdog timeout (1.0–2.2s), NMI trip point (1.25V on IN), industrial temperature range (−40°C to +85°C), and SOIC-8 package compatibility with MAX705/MAX706.

Technical Context

The DS1706LESA integrates three independent monitoring functions: precision VCC detection using an internal bandgap reference and comparator, pushbutton reset input with hardware debouncing and guaranteed 130ms active reset pulse, and a 1-second watchdog timer triggered by ST input transitions. Its RST output is active-high, distinguishing it from /RST variants like DS1706ESA.

It supports early power-fail warning via NMI generation when the external supply (monitored at IN) drops below 1.25V - configurable via resistor divider - and includes built-in hysteresis (100µV) and noise immunity (<2µs pulses ignored). The WDS output asserts low upon watchdog timeout, enabling system-level fault logging or recovery signaling.

Key Specifications

Pinout & Package

DS1706LESA uses an 8-pin SOIC (150-mil) package with gull-wing leads, JEDEC MS-012AC compliant, footprint identical to industry-standard MAX705/MAX706.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706ESA and DS1706ESA, DS1706LESA offers tighter ±5% VCC threshold accuracy and native active-high reset - reducing external logic and improving timing predictability in systems with RST-driven boot sequences.

Availability

DS1706LESA is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive telematics requiring stable component supply, long-term lifecycle support, and guaranteed SOIC-8 sourcing.

Supply support for DS1706LESA 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, medical, and communications systems.

The DS1706LESA belongs to the MicroMonitor™ family - engineered specifically for robust microprocessor supervision in harsh environments where reliable power-up, brownout recovery, and software watchdog functionality are mission-critical.

FAQ

What is the exact VCC reset threshold for DS1706LESA?

The DS1706LESA has a nominal VCC trip point of 4.65V with ±5% tolerance (4.50V to 4.75V), specified over −40°C to +85°C. This value is measured at the VCC pin and triggers the active-high RST output when supply voltage falls below the lower limit. DS1706LESA's threshold is tighter than DS1706ESA's ±10% spec and optimized for 5.0V systems requiring precise brownout detection.

Does DS1706LESA support active-high reset, and how does it differ from /RST variants?

Yes, DS1706LESA provides an active-high RST output - a key differentiator from /RST versions like DS1706ESA or MAX706ESA. This eliminates need for external inverters when interfacing with microcontrollers that require high-true reset signals. DS1706LESA's RST remains high during reset assertion and returns low only after VCC stabilizes for ≥130ms, ensuring clean processor initialization.

How does the NMI function work in DS1706LESA, and what is its trip point?

The NMI output in DS1706LESA activates when the voltage at the IN pin drops below 1.25V (typ), enabling early warning of upstream power failure. It pulses low for ≥200µs with 100µV hysteresis to reject noise. DS1706LESA's NMI can be routed to PBRST to auto-generate reset or to MCU interrupt pins for preemptive shutdown - distinct from RST which asserts later during VCC collapse.

What is the watchdog timeout range for DS1706LESA, and how is it triggered?

DS1706LESA's watchdog timer times out between 1.0s and 2.2s if the ST input is not toggled low before expiration. Time-out begins when RST goes inactive after power-up or reset release. Each ST falling edge resets the timer; failure to strobe within the window forces WDS low for ≥130ms. This behavior is identical across DS1706 family members and verified per AC Electrical Characteristics table.

Is DS1706LESA pin-compatible with MAX705/MAX706, and what package does it use?

Yes, DS1706LESA is pin-compatible with MAX705/MAX706 in 8-pin SOIC (150-mil) package - matching pin count, spacing, and functional assignment. Its SOIC footprint (order code ESA) allows direct substitution in legacy designs without PCB modification. DS1706LESA retains identical PBRST, VCC, GND, IN, NMI, ST, RST, and WDS pin roles, ensuring full interoperability at the board level.