Analog Devices Inc./Maxim Integrated DS1708REPA

Overview

DS1708REPA from Maxim Integrated is a 3.3V ±20% precision voltage supervisor IC that monitors VCC, senses external supply voltage via IN pin, and debounces pushbutton reset input (PBRST) to generate active-low and active-high reset outputs (RST and RST). It delivers 130 ms minimum reset pulse width, non-maskable interrupt (NMI) for early power-fail warning, and operates across -40°C to +85°C in 8-pin DIP package. Used in embedded microprocessor systems requiring robust power-up/power-down sequencing and fail-safe reset control.

For engineers reviewing the DS1708REPA datasheet, DS1708REPA pinout, DS1708REPA application, or DS1708REPA equivalent, key selection considerations include its 3.3V supply monitoring with 20% tolerance, dual-reset output polarity, NMI-driven system shutdown capability, PBRST debouncing timing, and compatibility with legacy MAX707/MAX708 designs in DIP-8 footprint.

Technical Context

The DS1708REPA implements a dual-threshold supervision architecture: one internal comparator monitors VCC against a fixed 2.63 V trip point (VCCTP min), while a second high-impedance comparator monitors the external IN pin against a 1.25 V reference (VTP) for customizable upstream voltage sensing. Both comparators drive independent logic paths for RST/RST and NMI generation.

Its reset timing is deterministic: on VCC dropout, RST/RST assert within 5–8 µs; on recovery, they remain asserted for ≥130 ms. The NMI output pulses low for ≥200 µs when IN falls below VTP, with 100 µV hysteresis and 5 µs noise immunity - enabling reliable early-warning shutdown before full reset activation.

Key Specifications

Pinout & Package

DS1708REPA is housed in an 8-pin plastic DIP (300-mil) package with through-hole mounting and industry-standard pin spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708ESA and TPS3808G12DBVR, DS1708REPA uniquely combines 3.3V-20% fixed supervision, integrated NMI for early warning, dual-polarity reset outputs, and hardware-debounced PBRST - delivering a complete, component-free reset solution for industrial 3.3V microprocessor systems.

Availability

DS1708REPA is available at Aetrix Electronics and suitable for industrial automation controllers, medical diagnostic equipment, telecom remote radio units, and automotive infotainment head units requiring stable component supply and long-term lifecycle assurance.

Supply support for DS1708REPA 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 DS1707/DS1708 family was designed specifically for microprocessor supervision in harsh environments - integrating precise voltage monitoring, pushbutton control, and non-maskable interrupt generation into a single 8-pin package to replace discrete reset solutions.

FAQ

What is the exact VCC trip point range for DS1708REPA?

The DS1708REPA has a guaranteed VCC trip point of 2.55 V (minimum), 2.63 V (typical), and 2.70 V (maximum), corresponding to 3.3V ±20% monitoring tolerance. 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. DS1708REPA uses this threshold to assert RST and RST outputs during power failure events.

Does DS1708REPA support both active-low and active-high reset outputs simultaneously?

Yes, DS1708REPA provides two independent reset outputs: RST (active-low, open-drain) and RST (active-high, push-pull). They assert and deassert synchronously during VCC monitoring events and pushbutton reset actions. This dual-output architecture eliminates the need for external inverters or level shifters when interfacing with diverse microprocessor reset inputs, and is confirmed in the Pin Description and Operation sections of the DS1708 datasheet.

Can DS1708REPA monitor voltages other than 3.3V?

Yes, DS1708REPA can monitor higher voltages using its IN pin, which compares an externally divided voltage against a precise 1.25 V internal reference. For example, a resistor divider can scale a 12 V supply down to 1.25 V at IN, enabling early detection of upstream power loss. The DS1708REPA datasheet provides the calculation method and maximum allowable input equation - confirming this capability is intrinsic to the device, not dependent on external ICs.

Is DS1708REPA pin-compatible with MAX707/MAX708 devices?

Yes, DS1708REPA is explicitly stated as pin compatible with MAX707 and MAX708 in 8-pin DIP, SOIC, and µSOP packages. The Pin Assignment diagrams and ordering information confirm identical pin numbering and function mapping - including PBRST, VCC, GND, IN, RST, RST, NC, and NMI. This allows direct substitution in existing MAX707/MAX708 designs without PCB layout changes, as documented in the Features section of the DS1707/DS1708 datasheet.

What is the guaranteed minimum reset pulse width for DS1708REPA?

The DS1708REPA guarantees a minimum reset pulse width of 130 ms for both RST and RST outputs, whether triggered by VCC dropout, power-up recovery, or PBRST activation. This timing is specified in the AC Electrical Characteristics table and verified across temperature and voltage ranges. The 130 ms hold time ensures microprocessors and associated peripherals fully stabilize before releasing reset - a critical requirement for reliable boot sequences in industrial systems using DS1708REPA.