Analog Devices Inc./Maxim Integrated MAX708REPA+

Overview

MAX708REPA+ from Maxim Integrated is a precision +3V microprocessor supervisory circuit with active-high and active-low reset outputs, 2.63V reset threshold, 200ms reset pulse width, and 100µA quiescent current, designed for reliable power-up/power-down monitoring in battery-powered portable instruments and industrial controllers.

For engineers reviewing the MAX708REPA+ datasheet, MAX708REPA+ pinout, MAX708REPA+ application, or MAX708REPA+ equivalent, key selection factors include dual-reset polarity support, guaranteed RESET assertion down to VCC = 1V, PFI comparator with 1.25V internal reference, and compatibility with -40°C to +85°C industrial temperature operation.

Technical Context

The MAX708REPA+ integrates a precision voltage monitor, dual-reset generator (RESET and RESET), power-fail comparator (PFI/PFO), and debounced manual reset input (MR) - all in a single 8-pin PDIP package. It lacks watchdog functionality, distinguishing it from MAX706/706A series.

Its reset threshold is fixed at 2.63V (±20mV hysteresis), asserted when VCC falls below this level or MR is pulled low, with guaranteed deassertion after 200ms once VCC exceeds threshold. The PFI input compares external voltage against a 1.25V internal reference to generate early power-fail warnings via open-drain PFO.

Key Specifications

Pinout & Package

MAX708REPA+ is housed in an 8-pin plastic DIP (PDIP) package (package code P8-1), lead-free compliant, with through-hole mounting and 0.3" wide body.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX708SEPA+, MAX708REPA+ offers tighter brownout immunity for +3V systems; versus TPS3808G12DBVR, it delivers full supervisory feature set (dual reset, PFI/PFO, MR) at higher quiescent current but in industry-standard PDIP format.

Availability

MAX708REPA+ is available at Aetrix Electronics and suitable for battery-powered portable instruments, industrial process controllers, medical diagnostic handhelds, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX708REPA+ 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 consumer applications.

The MAX708 series belongs to Maxim's microprocessor supervisory product line, engineered to replace discrete reset circuits in embedded systems requiring robust, low-cost, and temperature-stable power monitoring.

FAQ

What is the reset threshold voltage of the MAX708REPA+?

The MAX708REPA+ has a fixed reset threshold of 2.63V ±20mV, specified over the full -40°C to +85°C temperature range. This value is guaranteed for both rising and falling VCC transitions and includes built-in hysteresis to prevent chatter during threshold crossing. The threshold applies identically to both RESET and RESET outputs.

Does the MAX708REPA+ include a watchdog timer function?

No, the MAX708REPA+ does not include a watchdog timer. It is functionally distinct from the MAX706/706A series, which integrate WDI/WDO functionality. The MAX708REPA+ provides only voltage monitoring, dual-reset generation (RESET and RESET), PFI/PFO comparator, and manual reset - making it ideal for applications where watchdog supervision is handled separately or not required.

Can the MAX708REPA+ operate from a 1.8V supply?

Yes, the MAX708REPA+ operates from VCC = 1.2V to 5.5V. At 1.8V, its reset threshold remains 2.63V, so it will assert reset continuously - meaning it is not functional as a supervisor at 1.8V. Its minimum functional VCC is ~2.7V; below that, RESET remains asserted. For 1.8V systems, consider lower-threshold supervisors like MAX6326 (1.6V threshold).

How is the PFI input used in the MAX708REPA+?

The PFI input on the MAX708REPA+ connects to the inverting input of an internal comparator referenced to 1.25V. When external voltage applied to PFI falls below 1.25V, the open-drain PFO output pulls low. Designers use a resistive divider from a monitored supply (e.g., unregulated 12V) to PFI to set custom warning thresholds - for example, a 10:1 divider yields a 12.5V trip point.

What package type is used for the MAX708REPA+?

The MAX708REPA+ uses an 8-pin plastic dual in-line package (PDIP) with 0.3" body width and lead-free finish (package code P8-1). It is a through-hole mount device, compatible with standard wave soldering processes and legacy PCB layouts requiring DIP footprints.