Analog Devices Inc./Maxim Integrated DS1708TESA

Overview

DS1708TESA 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 to generate guaranteed 130ms active-low and active-high reset pulses. It delivers non-maskable interrupt (NMI) on early power-fail detection and operates across -40°C to +85°C industrial temperature range.

For engineers reviewing the DS1708TESA datasheet, DS1708TESA pinout, DS1708TESA application, or DS1708TESA equivalent, key selection considerations include its 3.3V ±5% VCC trip point (VCCTP = 3.00–3.15V), dual RST outputs, NMI early-warning capability, PBRST debounce timing, and compatibility with 8-pin SOIC layout.

Technical Context

The DS1708TESA implements a dual-threshold monitoring architecture: one comparator tracks VCC directly for reset assertion at VCCTP = 3.00–3.15V, while a second compares the IN pin voltage against an internal 1.25V reference to trigger NMI up to 200µs before VCC dropout. Both comparators feature built-in hysteresis (100µV on NMI path) and noise immunity against <2µs transients.

Its reset logic guarantees minimum 130ms pulse width on both RST and RST outputs during power-up and power-down events, independent of VCC slew rate. The PBRST input is internally pulled up to VCC (40kΩ typical) and generates synchronized reset pulses upon button release, with 250ns propagation delay and 150ns setup time.

Key Specifications

Pinout & Package

DS1708TESA is housed in an 8-pin SOIC (150-mil) package with exposed pad not present and RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708TESA and TPS3808G33DBVR, DS1708TESA uniquely combines 3.3V ±5% supervision, dual RST outputs, and NMI-driven early warning in a pin-compatible SOIC package-enabling robust fail-safe behavior without redesigning reset logic or adding discrete components.

Availability

DS1708TESA is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical diagnostic imaging subsystems, and automotive infotainment head units requiring stable component supply and long-term lifecycle support.

Supply support for DS1708TESA 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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS1708 series belongs to Maxim's MicroMonitor family-designed specifically for fail-safe microprocessor supervision in mission-critical systems where deterministic reset timing and early power-fail detection are essential.

FAQ

What is the exact VCC trip point range for DS1708TESA?

The DS1708TESA has a guaranteed VCC trip point (VCCTP) of 3.00V to 3.15V, corresponding to ±5% tolerance around a nominal 3.3V supply. This range is validated across -40°C to +85°C and ensures reset activation before most 3.3V microprocessors enter undefined operating states. DS1708TESA's trip point is distinct from DS1708R (2.55–2.70V) and DS1708S (2.85–3.00V), making it the precise choice for tight 3.3V supervision.

Does DS1708TESA support monitoring of voltages higher than VCC?

Yes, DS1708TESA supports monitoring of supplies exceeding VCC through its high-impedance IN pin, which references an internal 1.25V bandgap. Using an external resistor divider (e.g., R1 = 26kΩ, R2 = 10kΩ), DS1708TESA can safely sense up to 11.88V when VCC = 3.3V. The DS1708TESA datasheet provides the exact equation (VSENSE = (R2/(R1+R2)) × 1.25V) and maximum allowable monitored voltage (VMAX = (VTP/VSENSE) × VCC) to ensure design compliance.

How does the NMI output of DS1708TESA differ from the RST outputs?

The DS1708TESA NMI output is an open-drain signal that pulses low for ≥200µs when the IN pin voltage drops below 1.25V-providing early warning before VCC failure. In contrast, RST and RST are reset outputs that assert for ≥130ms only after VCC itself falls below 3.00V. This staged response allows DS1708TESA to initiate graceful shutdown (via NMI) before hard reset (via RST/RST), preserving data integrity in critical applications.

Is DS1708TESA pin-compatible with MAX708ESA?

Yes, DS1708TESA is pin-compatible with MAX708ESA in the 8-pin SOIC package: both share identical pin assignments for VCC, GND, IN, PBRST, RST, RST, NC, and NMI. However, MAX708ESA lacks the NMI output and IN sense functionality-meaning DS1708TESA can replace MAX708ESA in existing layouts but adds supervisory capability without PCB changes, whereas MAX708ESA cannot substitute for DS1708TESA in NMI-dependent designs.

What is the minimum reset pulse width guaranteed by DS1708TESA?

DS1708TESA guarantees a minimum reset pulse width of 130ms on both RST and RST outputs during power-up, power-down, and pushbutton reset events. This specification is tested across full temperature and voltage ranges and ensures sufficient time for power supply stabilization and microprocessor initialization. The DS1708TESA datasheet specifies maximum pulse width as 285ms, providing predictable timing margins for system-level timing analysis.