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 high-impedance 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, non-maskable interrupt (NMI) with 200 µs pulse and 100 µV hysteresis, and operates across -40°C to +85°C for industrial microprocessor power sequencing.

For engineers reviewing the DS1708TEUA datasheet, DS1708TEUA pinout, DS1708TEUA application, or DS1708TEUA equivalent, key selection criteria include its 3.3V ±5% VCC trip point (VCCTP = 3.00–3.15 V), dual-reset output polarity, NMI early-warning capability, PBRST debounce timing, and µSOP-8 package compatibility with space-constrained embedded control designs.

Technical Context

The DS1708TEUA implements a dual-threshold monitoring architecture: one comparator tracks VCC against an internal bandgap reference (VCCTP = 3.00–3.15 V), while a second compares external supply voltage at the IN pin to a fixed 1.25 V threshold (VTP = 1.20–1.30 V). Both comparators drive independent logic paths feeding RST/RST and NMI outputs.

Its reset generation includes built-in timing control: power-up reset remains asserted ≥130 ms after VCC exceeds VCCTP; power-down reset activates within 5–8 µs of VCC falling below VCCTP; and PBRST-triggered reset initiates ≥250 ns after button release, guaranteeing ≥130 ms active duration. NMI asserts for ≥200 µs when IN falls below VTP, with 5 µs noise immunity delay.

Key Specifications

Pinout & Package

DS1708TEUA 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 top-left, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT43D3+T and TLV809E33DBZR, DS1708TEUA uniquely combines 3.3V ±5% accuracy, dual-polarity reset outputs, NMI early warning, and configurable IN sensing in a single µSOP-8 package-enabling comprehensive power supervision without external components.

Availability

DS1708TEUA is available at Aetrix Electronics and suitable for industrial automation controllers, portable medical instruments, telecom remote terminals, and automotive body electronics requiring stable component supply and long-term lifecycle assurance.

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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications systems.

The DS1707/DS1708 family was engineered to replace discrete reset circuits in microprocessor systems, delivering integrated VCC monitoring, external supply sensing, and pushbutton reset control with guaranteed timing behavior.

FAQ

What is the exact VCC trip point range for DS1708TEUA?

The DS1708TEUA has a guaranteed VCC trip point (VCCTP) of 3.00 V minimum to 3.15 V maximum, corresponding to 3.3V ±5% tolerance. This range is specified over the full -40°C to +85°C operating temperature and applies to all units marked DS1708TEUA per the Maxim ordering table. The trip point is internally trimmed and does not require external calibration.

Does DS1708TEUA support monitoring of voltages other than 3.3V?

Yes, DS1708TEUA supports monitoring of other supply voltages via its IN pin, which triggers at a fixed 1.25 V threshold (1.20–1.30 V range). By using an external resistor divider between the target supply and GND, users can scale higher voltages (e.g., 5V, 12V) down to the IN pin's trip point-enabling flexible multi-rail supervision without additional ICs.

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

The NMI output of DS1708TEUA asserts low for ≥200 µs when the IN pin voltage drops below 1.25 V, providing early warning of upstream supply failure before VCC collapses. In contrast, RST and RST activate only after VCC itself falls below 3.00–3.15 V and remain active ≥130 ms during recovery-making NMI ideal for preemptive data save, while RST/RST enforce full processor reset.

Can DS1708TEUA replace MAX708 in existing designs?

Yes, DS1708TEUA is pin-compatible with MAX708 in the same 8-pin µSOP (118-mil) package and shares identical pin functions (PBRST, VCC, GND, IN, RST, RST, NC, NMI). Electrical behavior-including reset timing, trip points, and NMI characteristics-is functionally aligned, enabling drop-in replacement without PCB or firmware changes.

What is the maximum allowable voltage on the IN pin of DS1708TEUA?

The IN pin voltage must not exceed VCC at any time, as stated in the Absolute Maximum Ratings. To monitor supplies higher than VCC (e.g., 12V), a resistor divider must scale the input so that the voltage presented to IN stays ≤ VCC. For example, with VCC = 3.3V and desired IN trip = 1.25V, a 26 kΩ/10 kΩ divider enables safe monitoring of up to ~11.88V supply.