Analog Devices Inc./Maxim Integrated DS1708REUA

Overview

DS1708REUA from Maxim Integrated is a 3.3V ±20% voltage supervisor IC that monitors VCC, senses external supply voltage via high-impedance IN pin, and debounces pushbutton reset input (PBRST) to generate active-low and active-high reset outputs (RST and RST). It delivers 130 ms minimum reset pulse width, non-maskable interrupt (NMI) with 200 µs pulse and 100 µV hysteresis, and operates across -40°C to +85°C. Used in embedded microprocessor systems requiring early power-fail warning and reliable power-on reset.

For engineers reviewing the DS1708REUA datasheet, DS1708REUA pinout, DS1708REUA application, or DS1708REUA equivalent, key selection criteria include its 3.3V ±20% VCC trip point (2.55V–2.70V), dual-reset output polarity, NMI early-warning capability, PBRST debouncing, and µSOP-8 package compatibility with space-constrained industrial control and IoT edge nodes.

Technical Context

The DS1708REUA implements a precision bandgap-referenced comparator for VCC monitoring and an independent high-impedance IN input for upstream voltage sensing-enabling early detection of power decay before VCC drops below threshold. Its internal logic guarantees synchronized RST/RST assertion during power-down and holds reset active ≥130 ms after VCC recovery.

It integrates pushbutton debouncing with 250 ns propagation delay and generates a 200 µs NMI pulse when IN falls below 1.25 V, with built-in 5 µs noise immunity and 100 µV hysteresis to prevent false triggers. The device draws only 50 µA at VCC < 3.6 V and supports operation down to 1.2 V.

Key Specifications

Pinout & Package

DS1708REUA is housed in an 8-pin µSOP (118-mil) package with exposed pad for thermal performance. Pin numbering follows standard SOIC/SOP convention: Pin 1 = RST (active-low), Pin 2 = RST (active-high), Pin 3 = PBRST, Pin 4 = VCC, Pin 5 = NC, Pin 6 = NMI, Pin 7 = IN, Pin 8 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1708REUA, MAX708TEUA offers higher trip-point accuracy at the cost of reduced noise margin, while TPS3808G18DBVR trades away NMI and hardware reset debouncing for ultra-low IQ-making DS1708REUA optimal for industrial systems needing early warning and robust pushbutton handling.

Availability

DS1708REUA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed µSOP-8 sourcing.

Supply support for DS1708REUA 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 DS1707/DS1708 family was engineered to replace discrete reset circuits in microprocessor systems-delivering integrated VCC monitoring, external voltage sensing, and pushbutton control in a single 8-pin package.

FAQ

What is the exact VCC trip point range for DS1708REUA?

The DS1708REUA has a guaranteed VCC trip point range of 2.55 V to 2.70 V, corresponding to ±20% tolerance around a nominal 3.3 V supply. This range is specified over the full -40°C to +85°C operating temperature and is validated per the manufacturer's DC electrical characteristics table. The DS1708REUA uses an internal temperature-compensated bandgap reference to maintain stability across this range.

Does DS1708REUA provide both active-low and active-high reset outputs?

Yes, DS1708REUA provides two independent reset outputs: RST (active-low, open-drain) and RST (active-high, push-pull). Both outputs are asserted simultaneously during power failure, power-up, or pushbutton event, with identical 130–285 ms timing. This dual-output architecture eliminates external level-shifting or inversion circuitry in mixed-logic systems.

Can DS1708REUA monitor a voltage higher than its VCC supply?

Yes, DS1708REUA can monitor voltages above VCC using the high-impedance IN pin. The IN input is referenced to a 1.25 V internal bandgap, so an external resistor divider (e.g., R1 = 26 kΩ, R2 = 10 kΩ) scales a 12 V rail to 1.25 V at IN. The datasheet confirms VMAX = (VTP / VSENSE) × VCC, allowing safe monitoring of supplies up to 11.88 V when VCC = 3.3 V.

Is DS1708REUA pin-compatible with MAX708 devices?

Yes, DS1708REUA is pin-compatible with MAX708 variants in the same package type-in particular, the µSOP-8 footprint matches MAX708EUA. Pin functions (RST, RST, PBRST, VCC, IN, NMI, GND, NC) are identical, and electrical behavior (trip points, reset timing, NMI pulse width) is functionally equivalent, enabling direct substitution without PCB modification.

What is the minimum reset pulse width guaranteed by DS1708REUA?

The DS1708REUA guarantees a minimum reset pulse width of 130 ms for both RST and RST outputs, whether triggered by VCC dropout, power-up recovery, or PBRST activation. This duration is specified across -40°C to +85°C and ensures sufficient time for power supply stabilization and microprocessor initialization before release from reset.