Analog Devices Inc./Maxim Integrated DS1708ESA+T&R

Overview

DS1708ESA+T&R from Maxim Integrated is a 5.0V ±10% supply voltage supervisor IC with dual active-high/active-low reset outputs, non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC and an external sense point (IN), delivers 130ms minimum reset pulse width, and operates across -40°C to +85°C for industrial microprocessor power integrity. Used in embedded controllers requiring reliable brownout detection and controlled restart.

For engineers reviewing the DS1708ESA+T&R datasheet, DS1708ESA+T&R pinout, DS1708ESA+T&R application, or DS1708ESA+T&R equivalent, key selection criteria include VCC trip point accuracy (4.25–4.50V), NMI timing (200µs min pulse, 5µs noise immunity), RST/RST assertion delay (5–8µs), pushbutton debounce behavior, and SOIC-8 package compatibility with legacy MAX707/MAX708 designs.

Technical Context

The DS1708ESA+T&R implements a precision bandgap-referenced comparator architecture to monitor both local VCC (trip point 4.25–4.50V) and remote supply rail via high-impedance IN pin (trip point 1.20–1.30V). Its dual-reset outputs (RST active-high, RST active-low) provide simultaneous control of processor reset logic and peripheral enable paths without external inversion.

It integrates three independent monitoring functions: power-fail detection (generating NMI ≥200µs before reset), pushbutton input debouncing with guaranteed 130ms reset hold time, and hysteresis-based voltage sensing (100µV hysteresis on IN, no false triggers from <2µs noise). All functions operate within 1.2–5.5V supply range and draw ≤60µA quiescent current.

Key Specifications

Pinout & Package

DS1708ESA+T&R is housed in an 8-pin SOIC (150-mil) package with gull-wing leads, RoHS-compliant, tape-and-reel format (T&R).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708ESA+ and TPS3808G15DBVR, DS1708ESA+T&R uniquely combines dual reset polarity, hardware-debounced pushbutton support, and a dedicated NMI output with external voltage sense-enabling predictive power-fail response in systems where deterministic shutdown timing is critical.

Availability

DS1708ESA+T&R 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 assurance, and consistent parametric performance across temperature extremes.

Supply support for DS1708ESA+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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS1708ESA+T&R belongs to the MicroMonitor family of voltage supervisors, designed specifically for microprocessor-based systems needing coordinated reset, early power-fail warning, and pushbutton control without external components.

FAQ

What is the exact VCC trip point tolerance for DS1708ESA+T&R?

The DS1708ESA+T&R has a specified VCC trip point of 4.25V (minimum) to 4.50V (maximum), corresponding to a nominal 5.0V supply with ±10% tolerance. This range is guaranteed over the full -40°C to +85°C operating temperature and is measured under recommended DC operating conditions with VCC between 1.2V and 5.5V. The DS1708ESA+T&R uses internal temperature-compensated bandgap reference to maintain this accuracy without external calibration.

Does DS1708ESA+T&R support monitoring a 3.3V supply?

No - DS1708ESA+T&R is specifically configured for 5.0V ±10% monitoring. For 3.3V systems, Maxim offers variants such as DS1708TESA (3.3V ±5%) or DS1708SESA (3.3V ±10%). The DS1708ESA+T&R's VCCTP is fixed at 4.25–4.50V and cannot be adjusted; applying it to a 3.3V rail would result in continuous reset assertion. Always match the suffix (ESA, TESA, SESA, etc.) to the target supply voltage and tolerance.

How does the NMI output of DS1708ESA+T&R behave during power-up?

During power-up, the DS1708ESA+T&R disables NMI generation until VCC rises to its trip point (VCCTP ≈ 4.40V). This prevents false interrupts caused by slow-rising or noisy VCC. Once VCCTP is reached, the IN pin becomes active and will assert NMI if the monitored voltage (via resistor divider) falls below 1.25V. The DS1708ESA+T&R also incorporates 5µs blanking and 100µV hysteresis on the IN comparator to reject noise and ensure stable NMI triggering.

Can DS1708ESA+T&R replace MAX708ESA in an existing design?

Yes - DS1708ESA+T&R is pin-compatible with MAX708ESA in the SOIC-8 package and shares identical pinout, reset timing, and electrical characteristics for VCC supervision. However, DS1708ESA+T&R adds the IN pin for external voltage monitoring and NMI output, which are unused in MAX708ESA circuits. No PCB changes are required, but unused IN and NMI pins should be left floating or tied per application requirements to avoid unintended behavior.

What is the maximum allowable voltage on the IN pin of DS1708ESA+T&R?

The IN pin voltage must not exceed VCC, as stated in the Absolute Maximum Ratings. For example, with DS1708ESA+T&R operating at VCC = 5.0V, the IN pin must remain ≤5.0V. To monitor higher voltages (e.g., 12V), a resistor divider must scale the input so that the voltage at IN equals 1.25V at the desired trip point. Using the formula VSENSE = (R2/(R1+R2)) × VCC, proper R1/R2 values ensure compliance - e.g., monitoring 4.5V at 3.3V VCC yields VMAX = 11.88V with R2 = 10kΩ and R1 = 26kΩ.