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

Overview

DS1708ESA/T&R from Maxim Integrated is a 3.3V ±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 guarantees ≥130 ms reset pulse width. Used in embedded industrial controllers requiring reliable power-up/power-down sequencing and early power-fail warning.

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 (3.00–3.15 V), dual reset polarity support, NMI timing (≥200 ns pulse, 100 µV hysteresis), and compatibility with 8-pin SOIC industrial-grade packaging.

Technical Context

The DS1708ESA/T&R implements a precision bandgap-referenced comparator for VCC monitoring and an independent high-impedance IN pin comparator referenced to 1.25 V (±50 mV). Its internal 40 kΩ pull-up on PBRST enables direct pushbutton connection without external components.

Reset assertion occurs when VCC falls below VCCTP (3.00–3.15 V); both RST and RST remain active ≥130 ms after VCC recovery. NMI activates ≥200 ns after IN drops below 1.25 V, with built-in 5 µs noise immunity and 100 µV hysteresis to prevent false triggers.

Key Specifications

Pinout & Package

DS1708ESA/T&R uses 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 MAX708ESA and TPS3808G33DBVR, DS1708ESA/T&R uniquely combines 3.3 V ±5% accuracy, dual-reset polarity, NMI-based early warning, and pushbutton debounce in one 8-pin SOIC-enabling robust, feature-rich supervision without external components.

Availability

DS1708ESA/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, telecom remote terminal units, and smart energy meters requiring stable component supply and long-term lifecycle support.

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) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The DS1708ESA/T&R belongs to the MicroMonitor™ family-engineered specifically for reliable microprocessor supervision in harsh environments where deterministic reset timing, early power-fail warning, and minimal external components are critical.

FAQ

What is the exact VCC trip point range for DS1708ESA/T&R?

The DS1708ESA/T&R has a guaranteed VCC trip point (VCCTP) of 3.00 V minimum, 3.08 V typical, and 3.15 V maximum at −40°C to +85°C. This ±5% tolerance is calibrated for 3.3 V nominal systems and ensures consistent brownout detection across temperature and process variation. The DS1708ESA/T&R specification sheet confirms this range under DC Electrical Characteristics.

Does DS1708ESA/T&R support monitoring of voltages higher than its VCC supply?

Yes, DS1708ESA/T&R supports monitoring of voltages higher than VCC via its high-impedance IN pin. Using an external resistor divider referenced to the internal 1.25 V bandgap, users can scale inputs up to 11.88 V (e.g., 48 V telecom rails). The DS1708ESA/T&R datasheet specifies that IN voltage must not exceed VCC, but the divider ensures safe interface.

How does the NMI output of DS1708ESA/T&R differ from the RST outputs in timing behavior?

The DS1708ESA/T&R NMI output pulses low for ≥200 ns upon IN voltage crossing the 1.25 V threshold, providing early warning before reset asserts. In contrast, RST and RST remain active for ≥130 ms after VCC recovers. This staged response allows systems to save critical data before full reset-confirmed in the DS1708ESA/T&R timing diagrams (Figures 5 and 6).

Is DS1708ESA/T&R pin-compatible with MAX707/MAX708 in SOIC packages?

Yes, DS1708ESA/T&R is explicitly documented as pin-compatible with MAX707/MAX708 in 8-pin SOIC packages. Pin functions-including PBRST, VCC, GND, IN, RST, RST, NC, and NMI-match identically. The DS1708ESA/T&R datasheet states "Pin compatible with the MAXIM MAX707/MAX708 in 8-pin DIP, 8-pin SOIC packages," enabling drop-in replacement.

What is the guaranteed reset pulse width for DS1708ESA/T&R during power-up and pushbutton events?

The DS1708ESA/T&R guarantees a minimum reset pulse width of 130 ms for both power-up recovery and pushbutton reset events. This is specified as tRST and tRPU in the AC Electrical Characteristics table, with typical values of 205 ms and max 285 ms. The DS1708ESA/T&R internal timer ensures this duration regardless of VCC slew rate or button release timing.