Analog Devices Inc./Maxim Integrated DS1708TEUA+T&R

Overview

DS1708TEUA+T&R from Maxim Integrated is a 3.3V ±5% precision voltage supervisor IC with dual active-high/active-low reset outputs, non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC and an external sense point (IN), delivers 130ms minimum reset pulse width, and operates across -40°C to +85°C for industrial microprocessor power management.

For engineers reviewing the DS1708TEUA+T&R datasheet, DS1708TEUA+T&R pinout, DS1708TEUA+T&R application, or DS1708TEUA+T&R equivalent, key selection criteria include VCC trip point accuracy (3.00–3.15V), NMI timing (200µs min pulse, 5µs noise immunity), RST/RST assertion delay (5–8µs), and µSOP-8 package compatibility with space-constrained embedded systems.

Technical Context

The DS1708TEUA+T&R implements a dual-threshold monitoring architecture: one internal comparator detects VCC decay below 3.00–3.15V (±5% at 3.3V), while a second high-impedance IN input senses upstream supply voltage via external resistor divider, triggering NMI at 1.20–1.30V reference threshold. Both comparators feature built-in hysteresis (100µV on NMI) and noise rejection (5µs minimum glitch rejection).

Its reset logic asserts complementary RST (active-high) and RST (active-low) outputs simultaneously for 130–285ms after VCC recovery or PBRST release, with guaranteed minimum pulse width and no external capacitor required. The PBRST input is internally pulled up (40kΩ typical) and debounced to ensure clean 130ms reset generation independent of mechanical switch bounce.

Key Specifications

Pinout & Package

DS1708TEUA+T&R is housed in an 8-pin µSOP (118-mil) package with exposed pad for thermal performance. Pin assignments follow standard SOIC-compatible numbering but with reversed pin 1 orientation per Maxim mechanical drawings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708TESA+, DS1708TEUA+T&R offers lower quiescent current and smaller µSOP footprint; compared with TPS3808G33DBVR, it provides unique NMI early-warning capability and integrated pushbutton debouncing-making it optimal for systems requiring both fail-safe reset and graceful shutdown coordination.

Availability

DS1708TEUA+T&R is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive infotainment, and smart energy metering applications requiring stable component supply, long-term lifecycle support, and precise 3.3V ±5% power monitoring.

Supply support for DS1708TEUA+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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The DS1707/DS1708 family was designed specifically for robust microprocessor supervision in harsh environments-delivering simultaneous reset, early-warning interrupt, and pushbutton control in a single compact IC.

FAQ

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

The DS1708TEUA+T&R has a guaranteed VCC trip point range of 3.00V to 3.15V, corresponding to ±5% tolerance around a nominal 3.3V 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 Maxim datasheet. The DS1708TEUA+T&R uses a precision temperature-compensated bandgap reference to maintain this accuracy without external calibration.

Does DS1708TEUA+T&R support monitoring a 5V supply using the IN pin?

Yes, DS1708TEUA+T&R supports monitoring a 5V supply via the IN pin using an external resistor divider. The IN input has a fixed 1.25V internal reference threshold (1.20–1.30V range), so a voltage divider (e.g., R1 = 26kΩ, R2 = 10kΩ) scales the 5V signal down to 1.25V at the IN pin. The DS1708TEUA+T&R datasheet provides the exact formula and example calculations to determine correct resistor values while ensuring the IN voltage never exceeds VCC.

How does the pushbutton reset function work on DS1708TEUA+T&R?

The DS1708TEUA+T&R's PBRST pin is internally pulled up to VCC with ~40kΩ resistance. When a pushbutton connects PBRST to GND, the device debounces the contact bounce and, upon button release, asserts both RST and RST for a guaranteed minimum of 130ms. This eliminates need for external RC networks or firmware debounce logic. The DS1708TEUA+T&R timing diagram Figure 4 confirms the 130ms pulse starts at PBRST rising edge, making it fully hardware-controlled and deterministic.

Is DS1708TEUA+T&R pin-compatible with MAX707/MAX708 devices?

Yes, DS1708TEUA+T&R is explicitly stated as pin-compatible with MAX707/MAX708 in 8-pin DIP, SOIC, and µSOP packages. The pin functions (RST, RST, PBRST, VCC, GND, IN, NC, NMI) match identically across all three packages. However, note that DS1708TEUA+T&R uses the µSOP-8 (118-mil) variant, so physical board layout must match that specific footprint-not the larger SOIC-8 or DIP versions-even though electrical pinout is identical.

What is the purpose of the NC pin on DS1708TEUA+T&R?

Pin 7 on DS1708TEUA+T&R is designated NC (No Connect) and is internally unbonded. It must remain unconnected on the PCB to prevent unintended coupling, noise injection, or ESD paths. Unlike some "no-connect" pins that may serve as thermal pads or test points, the DS1708TEUA+T&R NC pin has no internal connection and carries zero functional role. Maxim's mechanical drawings and pin description table confirm this pin is not bonded and should be left floating per design guidelines.