Analog Devices Inc./Maxim Integrated MAX702EPA+

Overview

MAX702EPA+ from Maxim Integrated is a precision power-supply supervisory circuit designed to monitor +5V microprocessor power rails and assert a reset signal when VCC drops below 4.65V. It features a debounced manual-reset input (MR), guaranteed valid RESET output down to 1V VCC, and delivers a minimum 200ms reset pulse during power-up, power-down, and brownout conditions. Used in industrial controllers and embedded systems requiring reliable cold-start behavior.

For engineers reviewing the MAX702EPA+ datasheet, MAX702EPA+ pinout, MAX702EPA+ application, or MAX702EPA+ equivalent, key selection criteria include its fixed 4.65V reset threshold, −40°C to +85°C extended temperature operation, PDIP-8 package compatibility, and absence of adjustable voltage detection or dual RESET/RESET outputs-distinguishing it from MAX700/MAX701 variants.

Technical Context

The MAX702EPA+ implements a single internal comparator monitoring VCC directly (CTL = GND), with factory-trimmed 4.65V threshold and 30mV typical hysteresis. Its MR input includes internal 5µA pullup and debouncing logic to suppress switch bounce, ensuring clean reset assertion without external RC networks.

RESET output is open-drain with guaranteed low-level sink capability (≤0.4V at 3.2mA) and high-level sourcing up to VCC − 0.4V. The device draws only 100–200µA quiescent current and operates with VCC as low as 1V while maintaining correct reset state-critical for low-voltage brownout detection in legacy 5V µP systems.

Key Specifications

Pinout & Package

MAX702EPA+ is supplied in an 8-pin plastic dual-inline package (PDIP), RoHS-compliant with lead-free finish indicated by the '+' suffix. Pin 1 is MR (manual reset input), Pin 2 is GND, Pin 3 is RESET (open-drain active-low output), Pin 4 is VCC (power and sense input), Pins 5–8 are no-connect (N.C.) per MAX702-specific pin mapping.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply monitoring applications.

Compared with MAX702EPA+, MAX702CPA trades temperature resilience for lower cost in benign environments, while TPS3808G33DBVR offers compact packaging and tighter 3.3V tolerance but sacrifices MR debouncing, sub-1V reset validity, and industrial-grade thermal performance.

Availability

MAX702EPA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, and legacy industrial PCs requiring stable component supply with guaranteed long-term availability and extended temperature qualification.

Supply support for MAX702EPA+ 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, communications, and computing applications, emphasizing high reliability and integration.

The MAX700/MAX701/MAX702 family was engineered specifically for cost-sensitive, high-volume µP reset supervision in 5V systems-prioritizing simplicity, zero-adjustment operation, and guaranteed timing margins over programmability.

FAQ

What is the reset threshold voltage of the MAX702EPA+?

The MAX702EPA+ has a factory-trimmed reset threshold of 4.65V, with a guaranteed range of 4.50V to 4.75V across the full −40°C to +85°C temperature range. This fixed threshold eliminates external resistor networks and is optimized for standard +5V microprocessor power rails. The MAX702EPA+ does not support adjustable thresholds-unlike the MAX700 variant-and relies solely on VCC monitoring with CTL grounded.

Does the MAX702EPA+ provide both active-high and active-low reset outputs?

No, the MAX702EPA+ provides only a single active-low open-drain RESET output (Pin 3). Unlike the MAX701EPA+, it does not include an inverted RESET output. This simplifies interface design for µPs requiring only one reset signal, reduces pin count, and matches the minimal feature set intended for cost-driven applications where dual outputs are unnecessary.

Can the MAX702EPA+ operate with supply voltages below 5V?

Yes, the MAX702EPA+ operates with VCC from 1.0V to 5.5V and guarantees correct RESET output state down to 1V. Its internal comparator remains functional and asserts RESET when VCC falls below 4.65V-even at 1V supply-enabling reliable brownout detection in systems with weak or decaying power sources. However, output drive strength degrades below 3V, so interface design must verify µP reset pin compatibility.

Is the manual reset (MR) input of the MAX702EPA+ debounced in hardware?

Yes, the MR input of the MAX702EPA+ includes integrated hardware debouncing logic. A low pulse of ≥10µs on Pin 1 triggers a clean, bounce-free RESET assertion. This eliminates the need for external RC filters or firmware-based debouncing, reducing component count and improving reliability in mechanically actuated reset implementations such as front-panel buttons.

What package type and RoHS status does the MAX702EPA+ use?

The MAX702EPA+ uses an 8-pin plastic dual-inline package (PDIP) with lead-free finish, indicated by the '+' suffix in the part number. It complies with RoHS Directive 2011/65/EU and is rated for −40°C to +85°C operation. The PDIP package supports through-hole assembly and offers superior thermal mass and ease of prototyping compared to surface-mount alternatives.