Analog Devices Inc./Maxim Integrated DS1707ESA+

Overview

DS1707ESA+ from Maxim Integrated is a 5V ±5% microprocessor supervisory circuit that monitors VCC, senses external voltage via IN pin, and debounces pushbutton reset input. It delivers active-low and active-high reset outputs (RST and RST), non-maskable interrupt (NMI), and guarantees ≥130 ms reset pulse width. Used in industrial embedded systems requiring reliable power-up/power-down sequencing and early power-fail warning.

For engineers reviewing the DS1707ESA+ datasheet, DS1707ESA+ pinout, DS1707ESA+ application, or DS1707ESA+ equivalent, key selection considerations include its 4.50–4.75 V VCC trip point, dual-reset output polarity, NMI early-warning capability, and SOIC-8 industrial-temperature packaging - all critical for robust microcontroller reset management in power-sensitive designs.

Technical Context

The DS1707ESA+ implements a precision bandgap-referenced comparator to monitor VCC against a fixed 4.50–4.75 V threshold and independently monitor an external supply via the high-impedance IN pin (trip point 1.20–1.30 V). Its internal power-fail detection triggers RST/RST before VCC collapses below operational limits.

It integrates pushbutton debouncing with guaranteed 130 ms minimum reset pulse width upon PBRST release, and generates a 200 µs NMI pulse with 100 µV hysteresis when the IN-sensed supply crosses its threshold - enabling controlled system shutdown prior to reset assertion.

Key Specifications

Pinout & Package

DS1707ESA+ is housed in an 8-pin SOIC (150-mil) package with gull-wing leads, RoHS-compliant and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX707ESA+, DS1707ESA+ offers identical supervisory functionality and pinout but reflects Maxim's later-generation process and enhanced ESD robustness; versus TPS3808G18DBVR, DS1707ESA+ provides full feature parity including NMI, PBRST, and programmable IN sensing - making it suitable for complex, safety-critical reset architectures.

Availability

DS1707ESA+ is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, telecom infrastructure, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.

Supply support for DS1707ESA+ 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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.

The DS1707ESA+ belongs to Maxim's MicroMonitor™ family of supervisory circuits, designed specifically for reliable microprocessor reset generation, power-fail warning, and external voltage monitoring in mission-critical embedded systems.

FAQ

What is the VCC trip point tolerance for DS1707ESA+?

The DS1707ESA+ has a VCC trip point of 4.50 V (min), 4.65 V (typ), and 4.75 V (max), corresponding to a ±5% tolerance around 4.65 V nominal. This specification ensures consistent reset activation across temperature and process variation in 5V systems, and is validated over the full -40°C to +85°C operating range. DS1707ESA+ does not support adjustable trip points - the threshold is factory-trimmed and fixed.

Does DS1707ESA+ provide both active-high and active-low reset outputs?

Yes, DS1707ESA+ provides simultaneous RST (active-low, open-drain) and RST (active-high, push-pull) outputs. This dual-output architecture eliminates the need for external level-shifting or inversion logic when interfacing with microcontrollers or FPGAs that require different reset polarities. Both outputs are asserted synchronously during power faults, pushbutton events, or IN-sense violations, with guaranteed minimum pulse widths of 130 ms.

Can DS1707ESA+ monitor a 3.3V supply?

No, DS1707ESA+ is specifically configured for 5V ±5% monitoring (VCCTP = 4.50–4.75 V) and is not suitable for direct 3.3V supply supervision. For 3.3V systems, use DS1708TESA+ (3.3V ±5%) or DS1708SESA+ (3.3V ±10%). However, DS1707ESA+ can monitor higher-voltage rails indirectly using the IN pin with an external resistor divider, as long as the divided voltage falls within the 1.20–1.30 V trip window.

How does the NMI function work in DS1707ESA+?

The NMI output in DS1707ESA+ pulses low for ≥200 µs when the voltage at the IN pin crosses its 1.25 V threshold, providing early warning of power degradation before VCC drops to its trip point. The circuit includes 100 µV hysteresis and requires ~5 µs of sustained violation to avoid noise-induced false triggers. DS1707ESA+ disables NMI during initial power-up until VCC reaches VCCTP, preventing spurious interrupts during ramp-up.

Is DS1707ESA+ pin-compatible with other MicroMonitor devices?

Yes, DS1707ESA+ is pin-compatible with the MAX707/MAX708 series in 8-pin SOIC packages, sharing identical pin assignments for PBRST, VCC, GND, IN, RST, RST, NC, and NMI. This allows drop-in replacement in existing designs using MAX707ESA+ or MAX708ESA+, provided the trip point (DS1707 = 5V±5%, DS1708 = 5V±10%) matches the system requirement. No PCB layout changes are needed for migration between these variants.