Dallas Semiconductor DS1708ESA

Overview

DS1708ESA from Maxim Integrated is a 5.0V ±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 sequencing and early power-fail warning.

For engineers reviewing the DS1708ESA datasheet, DS1708ESA pinout, DS1708ESA application, or DS1708ESA equivalent, key selection criteria include its 5V-10% VCC trip point (4.25–4.50 V), 130 ms minimum reset pulse width, NMI generation at 1.25 V IN threshold, and compatibility with industrial-grade 8-pin SOIC packaging.

Technical Context

The DS1708ESA integrates three independent monitoring functions: VCC supply detection using an internal temperature-compensated reference, high-impedance voltage sense at the IN pin referenced to 1.25 V, and edge-triggered PBRST debouncing with guaranteed 130 ms reset assertion. All logic thresholds are internally fixed and require no external components.

Its dual-reset architecture provides simultaneous active-low (RST) and active-high (RST) signals for direct interfacing with diverse microprocessor reset inputs, while the NMI output enables preemptive system shutdown before VCC collapse. The device asserts reset when VCC falls below 4.25 V and holds it for ≥130 ms after recovery.

Key Specifications

Pinout & Package

DS1708ESA is housed in an 8-pin SOIC (150-mil) package with gull-wing leads, JEDEC MS-012AC compliant, 1.75 mm body height, and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1708ESA, MAX708ESA offers identical supervision features and pinout for seamless drop-in use, while TPS3808G18DBVR provides lower-cost basic reset functionality but omits NMI, PBRST, and dual-output capability required for robust industrial fail-safe designs.

Availability

DS1708ESA is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, telecom infrastructure cards, and automotive infotainment head units requiring stable component supply and long-term lifecycle assurance.

Supply support for DS1708ESA 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 markets.

The DS1708ESA belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically for deterministic power-fail detection, reset generation, and system-level reliability in harsh industrial and embedded environments.

FAQ

What is the exact VCC trip point range for DS1708ESA?

The DS1708ESA has a guaranteed VCC trip point range of 4.25 V (minimum) to 4.50 V (maximum) at -40°C to +85°C, corresponding to a nominal 5.0 V supply with ±10% tolerance. This specification is validated per Maxim's DS1707/DS1708 datasheet Rev. 0, page 7, DC Electrical Characteristics table. The DS1708ESA does not support 3.3 V or other voltage variants - those are handled by DS1708TESA (3.3V-5%) or DS1708SESA (3.3V-10%).

Does DS1708ESA provide both active-low and active-high reset outputs?

Yes, DS1708ESA 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 microprocessor interfaces. The RST output can drive directly into processors requiring active-high reset, while RST interfaces cleanly with legacy systems expecting active-low assertion - both asserted synchronously for ≥130 ms during power-up or brownout recovery.

Can DS1708ESA monitor a 12V supply rail?

Yes, DS1708ESA can monitor a 12 V supply rail using its IN pin, which has a fixed 1.25 V threshold. A resistor divider (e.g., R1 = 26 kΩ, R2 = 10 kΩ) scales the 12 V input down to 1.25 V at the IN pin. Per the datasheet Figure 5, this configuration ensures accurate trip-point translation while limiting IN pin voltage to ≤VCC. The DS1708ESA's high-impedance IN input (≤1 µA leakage) minimizes loading on the divider network, preserving accuracy across temperature.

What is the purpose of the NMI output on DS1708ESA?

The NMI (non-maskable interrupt) output on DS1708ESA provides early warning of impending power failure - activating ≥200 µs before RST/RST assert - by detecting when the IN pin voltage falls below 1.25 V. This gives the host microprocessor time to execute critical tasks like saving volatile data or shutting down peripherals safely. Unlike RST, NMI is edge-triggered and self-clearing, making it ideal for initiating controlled shutdown sequences without halting core execution until final reset.

Is DS1708ESA pin-compatible with MAX708ESA?

Yes, DS1708ESA is pin-compatible with MAX708ESA in the 8-pin SOIC (150-mil) package, sharing identical pin assignments, electrical behavior, timing specs, and functional block diagram. Maxim explicitly states this compatibility in the "Pin Compatible With" section of the DS1707/DS1708 datasheet (page 1). Both devices deliver 5V-10% supervision, dual reset outputs, NMI, and PBRST debounce - enabling direct substitution without PCB or firmware changes.