Analog Devices Inc./Maxim Integrated DS1708SESA+

Overview

DS1708SESA+ from Maxim Integrated is a 3.3V ±10% microprocessor supervisory circuit that monitors VCC, senses external voltage via IN pin, and debounces pushbutton reset input (PBRST). It delivers active-low and active-high reset outputs (RST and RST), non-maskable interrupt (NMI), and operates across -40°C to +85°C. Used in embedded systems requiring reliable power-up/down sequencing and early power-fail warning.

For engineers reviewing the DS1708SESA+ datasheet, DS1708SESA+ pinout, DS1708SESA+ application, or DS1708SESA+ equivalent, key selection criteria include VCC trip point accuracy (2.85–3.00 V), guaranteed 130 ms minimum reset pulse width, NMI timing (200 µs min pulse, 5 µs noise immunity), and compatibility with 3.3V microcontroller power domains.

Technical Context

The DS1708SESA+ integrates three independent monitoring functions: VCC supply supervision with precision bandgap reference, high-impedance voltage sense input (IN) referenced to 1.25 V threshold, and debounced pushbutton reset control. Its dual reset outputs (RST and RST) are synchronized to VCC transitions with built-in hysteresis and 130 ms minimum assertion time.

NMI generation occurs when the IN pin voltage falls below 1.25 V, with 100 µV hysteresis and 5 µs qualification delay to reject noise. The device uses internal 40 kΩ pull-up on PBRST and supports automatic reset triggering by connecting NMI to PBRST - enabling self-reset on sensed upstream power failure.

Key Specifications

Pinout & Package

DS1708SESA+ is housed in an 8-pin SOIC (150-mil) package with exposed pad not present. Pin assignments are standardized across DS1707/DS1708 family and validated per Maxim's mechanical drawings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708TESA+, DS1708SESA+ trades ±5% trip accuracy for wider ±10% tolerance-beneficial in noisy or loosely regulated 3.3V domains-while retaining NMI and IN monitoring. Against TPS3808G33DBVR, DS1708SESA+ adds critical fault-prevention capabilities including early-interrupt signaling and flexible external voltage sensing.

Availability

DS1708SESA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, telecom base station cards, and automotive infotainment modules requiring stable component supply and long-term lifecycle support.

Supply support for DS1708SESA+ 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, computing, and communications applications.

The DS1708SESA+ belongs to the MicroMonitor™ supervisory IC product line, engineered specifically for robust power-supply monitoring, pushbutton reset control, and early power-fail warning in microprocessor-based systems.

FAQ

What is the exact VCC trip point range for DS1708SESA+?

The DS1708SESA+ has a guaranteed VCC trip point range of 2.85 V to 3.00 V, corresponding to ±10% tolerance around a nominal 3.3 V supply. This specification is validated across the full -40°C to +85°C operating temperature range and is defined in the DC Electrical Characteristics table of the official Maxim datasheet. The trip point ensures reliable reset assertion before most 3.3 V microcontrollers enter undefined operation.

Does DS1708SESA+ provide both active-high and active-low reset outputs?

Yes, DS1708SESA+ provides two independent reset outputs: RST (active-low, open-drain) and RST (active-high, push-pull). This dual-output architecture eliminates the need for external inverters or pull-up resistors in many designs. RST can directly drive logic-level reset inputs, while RST interfaces with legacy microcontrollers requiring active-low reset assertion, making DS1708SESA+ adaptable across diverse MCU families.

How does the NMI output of DS1708SESA+ function during power failure?

The NMI output of DS1708SESA+ pulses low for ≥200 µs when the voltage at the IN pin falls below 1.25 V, providing early warning of upstream power degradation. It incorporates 5 µs noise qualification and 100 µV hysteresis to prevent false triggers. This allows systems to execute critical tasks-such as saving volatile data or logging fault conditions-before the main RST/RST signals activate, enhancing system resilience in DS1708SESA+ implementations.

Can DS1708SESA+ monitor voltages other than 3.3 V?

Yes, DS1708SESA+ can monitor any DC voltage using its high-impedance IN pin and an external resistor divider. The internal comparator references a precise 1.25 V threshold, so users select R1 and R2 values to scale the target supply down to 1.25 V at the IN pin. For example, a 12 V rail can be monitored by setting R1 = 26 kΩ and R2 = 10 kΩ. DS1708SESA+ requires only that the scaled voltage never exceeds VCC at the IN pin.

Is DS1708SESA+ pin-compatible with older Maxim supervisory ICs?

Yes, DS1708SESA+ is pin-compatible with the MAX707/MAX708 in 8-pin SOIC packages, sharing identical pin assignments for VCC, GND, PBRST, IN, RST, RST, NC, and NMI. This allows drop-in replacement in existing designs using those legacy parts, provided the ±10% trip point of DS1708SESA+ meets system requirements. No PCB layout changes are needed when upgrading from MAX708ESA+ to DS1708SESA+.