Analog Devices Inc./Maxim Integrated DS1708TEUA+

Overview

DS1708TEUA+ from Maxim Integrated is a 3.3V ±5% precision voltage supervisor IC that monitors VCC, senses external supply voltage via IN pin, and debounces pushbutton reset input (PBRST) to generate active-high and active-low reset outputs (RST and RST). It delivers 130 ms minimum reset pulse width, NMI early-warning interrupt, and operates across -40°C to +85°C for industrial microprocessor power management.

For engineers reviewing the DS1708TEUA+ datasheet, DS1708TEUA+ pinout, DS1708TEUA+ application, or DS1708TEUA+ equivalent, key selection considerations include its 3.3V ±5% VCC trip point (VCCTP = 3.00–3.15 V), dual-reset output polarity, NMI generation at 1.25 V IN threshold, and µSOP-8 package compatibility with board space-constrained embedded systems.

Technical Context

The DS1708TEUA+ implements a dual-threshold monitoring architecture: one comparator tracks VCC directly for brown-out detection (VCCTP = 3.00–3.15 V), while a second high-impedance comparator monitors an external supply via the IN pin using an internal 1.25 V reference. Its NMI output asserts for ≥200 ns when IN falls below 1.25 V, with 100 µV hysteresis and 5 µs noise immunity.

Reset assertion is synchronized to VCC decay and guarantees ≥130 ms active duration on power-up or PBRST release. The device integrates internal 40 kΩ pull-up on PBRST, supports direct NMI-to-PBRST feedback for autonomous reset-on-failure, and maintains operation down to 1.2 V VCC with <60 µA quiescent current at VCC < 5.5 V.

Key Specifications

Pinout & Package

DS1708TEUA+ uses an 8-pin µSOP (118-mil) package with 0.5 mm pitch, measuring 3.0 mm × 3.0 mm × 1.0 mm height. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708TESA+ and TPS3808G33DBVR, DS1708TEUA+ uniquely combines 3.3V ±5% supervision, dual-reset polarity, external supply sensing via IN, and early-warning NMI - making it the only option among the three capable of coordinated multi-rail failure response without external components.

Availability

DS1708TEUA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom radio units, and automotive infotainment head units requiring stable component supply and long-term lifecycle support.

Supply support for DS1708TEUA+ 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 DS1708TEUA+ belongs to the MicroMonitor™ family, engineered specifically for robust, multi-point power supervision in microprocessor-based systems where deterministic reset timing and early power-fail warning are mission-critical.

FAQ

What is the exact VCC trip point range for DS1708TEUA+?

The DS1708TEUA+ has a guaranteed VCC trip point (VCCTP) range of 3.00 V to 3.15 V, corresponding to ±5% tolerance around a nominal 3.3 V supply. This specification is validated across the full -40°C to +85°C operating temperature range and is defined in the DC Electrical Characteristics table of the official datasheet. DS1708TEUA+ uses this threshold to assert RST and RST outputs during brown-out conditions.

Does DS1708TEUA+ support monitoring of voltages other than 3.3V?

Yes, DS1708TEUA+ supports monitoring of any DC voltage via its IN pin, which compares the applied voltage against an internal 1.25 V reference. Using an external resistor divider (e.g., R1 = 26 kΩ, R2 = 10 kΩ), users can scale higher supplies like 5 V, 12 V, or 24 V down to the 1.25 V threshold. DS1708TEUA+ requires the IN voltage to remain ≤ VCC, so proper divider design ensures safe operation across all input conditions.

How does the NMI output of DS1708TEUA+ differ from the RST outputs?

The NMI output of DS1708TEUA+ is an open-drain, active-low interrupt pulse (≥200 ns wide) triggered when the IN pin voltage falls below 1.25 V - providing early warning before VCC collapses. In contrast, RST and RST are reset outputs asserted when VCC itself drops below 3.00–3.15 V. DS1708TEUA+ uses NMI for preemptive actions (e.g., saving state), while RST/RST enforce full processor reset only upon critical rail failure.

Can DS1708TEUA+ generate a reset pulse automatically when NMI is asserted?

Yes, DS1708TEUA+ supports automatic reset generation by connecting the NMI output directly to the PBRST input. When NMI pulses low due to IN voltage decay, DS1708TEUA+ debounces and times the signal to produce a guaranteed ≥130 ms RST/RST pulse - enabling fully autonomous shutdown and restart without MCU intervention. This configuration is documented in Figure 3 of the DS1708 datasheet.

What is the package type and footprint compatibility of DS1708TEUA+?

DS1708TEUA+ uses an 8-pin µSOP (118-mil) package with 0.5 mm lead pitch and 3.0 mm × 3.0 mm body size. It is pin-compatible with the DS1708ESA (SOIC-8) and DS1708EPA (DIP-8) variants, sharing identical pin functions and ordering logic. DS1708TEUA+ is also pin-compatible with the MAX707/MAX708 family in µSOP-8, enabling drop-in replacement where board layout matches the 118-mil variant.