Analog Devices Inc./Maxim Integrated DS1707EUA+T&R

Overview

DS1707EUA+T&R from Maxim Integrated is a 5V ±5% 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 in industrial systems requiring reliable power-up/power-down sequencing.

For engineers reviewing the DS1707EUA+T&R datasheet, DS1707EUA+T&R pinout, DS1707EUA+T&R application, or DS1707EUA+T&R equivalent, key selection criteria include its 4.50–4.75V VCC trip point, 130ms minimum reset pulse width, NMI early-warning capability with 1.25V IN threshold, and µSOP-8 package compatibility with space-constrained embedded controllers.

Technical Context

The DS1707EUA+T&R implements dual-reset supervision: VCC monitoring triggers RST/RST at VCCTP = 4.50–4.75V with 130–285ms active duration, while the high-impedance IN pin enables user-defined voltage sensing using an external resistor divider referenced to a 1.20–1.30V internal bandgap. Its NMI output pulses low for ≥200ns upon IN voltage decay below threshold, with 100µV hysteresis and 5µs noise immunity.

Internally, PBRST is pulled up to VCC via ~40kΩ and debounced to guarantee ≥130ms reset assertion after button release. The device supports both 5V systems (DS1707 variant) and 3.3V variants (DS1708 family), but DS1707EUA+T&R is specifically configured for 5V ±5% tolerance operation and requires no external components for basic reset functionality.

Key Specifications

Pinout & Package

DS1707EUA+T&R is housed in an 8-pin µSOP (118-mil) package with exposed pad for thermal performance. Pin assignments follow standard SOIC-compatible numbering but with reversed pin 1 orientation per Maxim mechanical drawings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX707ESA+, DS1707EUA+T&R adds NMI and IN-based voltage sensing for enhanced system resilience; compared with TPS3808G12DBVR, it offers integrated pushbutton handling, dual-reset polarity, and higher integration-justifying its use in complex industrial controllers where reliability and feature completeness outweigh footprint savings.

Availability

DS1707EUA+T&R is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive infotainment, and network infrastructure applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for DS1707EUA+T&R 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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The DS1707EUA+T&R belongs to Maxim's MicroMonitor™ supervisory IC product line, designed specifically to ensure robust microprocessor startup, brownout recovery, and graceful shutdown in mission-critical embedded systems.

FAQ

What is the exact VCC trip point range for DS1707EUA+T&R?

The DS1707EUA+T&R has a guaranteed VCC trip point of 4.50V (min), 4.65V (typ), and 4.75V (max) at -40°C to +85°C. This ±5% tolerance around 4.65V ensures reliable reset activation before a nominal 5V supply falls below the operational threshold of most microcontrollers. The specification is tested and binned per unit, and the DS1707EUA+T&R is not interchangeable with DS1708 variants which have different trip points.

Does DS1707EUA+T&R support 3.3V systems?

No, DS1707EUA+T&R is specifically configured for 5V ±5% monitoring and is not rated for 3.3V operation. Its VCCTP range (4.50–4.75V) is incompatible with 3.3V rails. For 3.3V systems, Maxim offers DS1708TEUA+T&R (3.3V ±5%) or DS1708SEUA+T&R (3.3V ±10%). Using DS1707EUA+T&R on a 3.3V supply would result in continuous reset assertion since VCC remains below the trip threshold.

Can DS1707EUA+T&R generate a reset pulse longer than 130ms?

Yes, DS1707EUA+T&R guarantees a minimum reset pulse width of 130ms, but actual duration depends on VCC slew rate and can extend up to 285ms under slow power-up conditions. The tRST parameter specifies 130–285ms, meaning the device holds RST and RST active for the full interval regardless of how quickly VCC rises-ensuring adequate stabilization time for processors with long boot sequences.

Is the IN pin on DS1707EUA+T&R capable of monitoring voltages above VCC?

No-the IN pin voltage must never exceed VCC, as stated in the Absolute Maximum Ratings. To monitor higher voltages (e.g., 12V), DS1707EUA+T&R requires an external resistor divider that scales the input down to ≤VCC while maintaining the 1.25V threshold relationship. The device does not include overvoltage protection on IN, and violating this limit risks permanent damage.

How does the NMI output of DS1707EUA+T&R differ from the RST outputs?

The NMI output of DS1707EUA+T&R is an open-drain signal that pulses low for ≥200ns when the IN pin voltage crosses its 1.20–1.30V threshold-providing early warning of power failure before VCC drops. In contrast, RST and RST are reset outputs activated only after VCC itself falls below 4.50V; they remain active for ≥130ms. NMI enables preemptive system actions (e.g., saving state), while RST/RST enforce hard reset.