Analog Devices Inc./Maxim Integrated DS1708RESA/T&R

Overview

DS1708RESA/T&R from Maxim Integrated is a 3.3V ±20% supply voltage supervisor IC with dual active-high/active-low reset outputs, non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC, an external sense point (IN), and PBRST to ensure microprocessor reliability during power transients and failures in industrial embedded systems. Key confirmed parameters: VCC trip point = 2.55–2.70 V, reset timeout = 130–285 ms, NMI pulse width ≥200 ns, operating temperature = –40°C to +85°C, and SOIC-8 package.

For engineers reviewing the DS1708RESA/T&R datasheet, DS1708RESA/T&R pinout, DS1708RESA/T&R application, or DS1708RESA/T&R equivalent, this page delivers verified functional role, precise reset thresholds, timing behavior under power-up/down, NMI early-warning capability, and validated alternatives for 3.3V system supervision where ±20% tolerance and industrial-grade reliability are required.

Technical Context

The DS1708RESA/T&R implements a precision bandgap-referenced comparator architecture to monitor both local VCC (trip point 2.55–2.70 V) and remote supply voltage via high-impedance IN pin (trip point 1.20–1.30 V). Its dual RST outputs provide simultaneous active-high and active-low reset signals with guaranteed minimum 130 ms assertion time after power recovery or pushbutton release.

It integrates a 40 kΩ internal pull-up on PBRST for direct pushbutton interface, debounces mechanical inputs, and generates a 200 ns minimum NMI pulse with 100 µV hysteresis to reject noise-induced false interrupts. The device requires no external components for basic operation and supports automatic reset initiation via NMI-to-PBRST feedback.

Key Specifications

Pinout & Package

DS1708RESA/T&R is supplied in an 8-pin SOIC (150-mil) package, RoHS-compliant, tape-and-reel format (T&R). Pin functions are electrically identical across DS1707/DS1708 family variants and validated per Maxim's mechanical drawings for SOIC-8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1708RESA/T&R, MAX708TESA offers tighter tolerance but omits critical NMI and IN functionality, while TPS3808G33DBVR improves accuracy and delay flexibility at the cost of losing pushbutton support and early-warning capability-making DS1708RESA/T&R uniquely suited for robust, feature-complete 3.3V supervision in industrial edge devices.

Availability

DS1708RESA/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, and ruggedized data loggers requiring stable component supply, long-term lifecycle assurance, and guaranteed SOIC-8 tape-and-reel delivery.

Supply support for DS1708RESA/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) designs precision analog and mixed-signal ICs for industrial, automotive, and communications applications, with emphasis on reliability and integration.

The DS1708RESA/T&R belongs to the MicroMonitor™ family of voltage supervisors, engineered specifically for fault-tolerant microprocessor supervision in harsh environments where power integrity and deterministic reset behavior are mission-critical.

FAQ

What is the exact VCC trip point range for DS1708RESA/T&R?

The DS1708RESA/T&R has a guaranteed VCC trip point range of 2.55 V to 2.70 V, corresponding to its 3.3V ±20% specification. This range is explicitly defined in the "DC Electrical Characteristics" table of the official Maxim datasheet for DS1708R variants, and applies directly to DS1708RESA/T&R as confirmed by the Ordering Information table listing it as "3.3V-20% MONITOR."

Does DS1708RESA/T&R support both active-high and active-low reset outputs simultaneously?

Yes, DS1708RESA/T&R provides two independent reset outputs: RST (active-low, open-drain) and RST (active-high, push-pull). Both assert concurrently during power-up, power-down, or pushbutton event, with identical 130–285 ms timeout. This dual-output architecture eliminates level-shifting components in systems with mixed logic families.

Can DS1708RESA/T&R monitor a supply voltage higher than 3.3V?

Yes - via the IN pin, DS1708RESA/T&R monitors external supplies using a resistor divider to scale down voltages to its 1.25 V internal reference. For example, a 12 V supply can be sensed using R1 = 26 kΩ and R2 = 10 kΩ, as calculated in the datasheet's Figure 5. The IN pin's high impedance (leakage ±1.0 µA) ensures minimal loading on the divider network.

What is the function of the NMI output on DS1708RESA/T&R?

The NMI output on DS1708RESA/T&R generates a short, noise-immune low pulse (≥200 ns) when the IN pin voltage falls below 1.25 V. With 100 µV hysteresis and 5 µs noise rejection, it serves as an early warning signal-allowing the host processor to execute emergency routines before VCC dropout forces a hard reset via RST/RST.

Is DS1708RESA/T&R pin-compatible with other members of the DS1707/DS1708 family?

Yes - DS1708RESA/T&R shares identical pinout, electrical behavior, and SOIC-8 footprint with all DS1707/DS1708 variants (e.g., DS1708ESA, DS1707ESA), including matching PBRST, VCC, GND, IN, RST, RST, NC, and NMI assignments. This allows drop-in replacement within the same voltage/tolerance grade without PCB modification.