Analog Devices Inc./Maxim Integrated MAX700ESA+T

Overview

MAX700ESA+T from Maxim Integrated is a precision power-supply supervisory circuit designed to monitor +5V systems and generate reliable reset signals during power-up, power-down, and brownout conditions. It features factory-trimmed 4.65V VCC threshold, ≥200ms reset pulse width, adjustable voltage detection via SENSE input (1.29V reference), and programmable hysteresis via HYST pin - all in an 8-pin narrow-SO package rated for -40°C to +85°C operation.

For engineers reviewing the MAX700ESA+T datasheet, MAX700ESA+T pinout, MAX700ESA+T application, or MAX700ESA+T equivalent, this device delivers deterministic reset timing, manual-reset debouncing, and dual-mode monitoring (VCC or external SENSE) critical for industrial controllers, embedded µP systems, and intelligent instrumentation requiring robust power-fail response.

Technical Context

The MAX700ESA+T implements a precision bandgap-referenced comparator with internal 1.29V reference, enabling accurate voltage monitoring either directly on VCC (CTL = GND) or externally via SENSE (CTL = VCC). Its reset logic guarantees valid output state down to VCC = 1V and enforces ≥200ms minimum pulse width regardless of supply ramp rate.

It supports two distinct operating modes: fixed-threshold VCC supervision (4.65V ±150mV) and adjustable-threshold external sensing using resistor dividers on SENSE, with hysteresis programmable via HYST pin's 1kΩ pulldown. The MR input includes internal 5µA pullup and hardware debouncing.

Key Specifications

Pinout & Package

MAX700ESA+T is supplied in an 8-pin narrow-SO (SOIC-8) package with 1.27mm pitch, RoHS-compliant lead-free finish (+ suffix), and JEDEC MS-012AC outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6710ARZ-REEL7, the MAX700ESA+T uniquely supports both fixed and adjustable voltage supervision, manual reset with debouncing, and programmable hysteresis - making it the only option among the three capable of replacing discrete resistor-divider supervisors in multi-rail or variable-threshold systems.

Availability

MAX700ESA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom line cards, and automotive infotainment ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX700ESA+T 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 markets.

The MAX700ESA+T belongs to Maxim's supervisory circuit product line, engineered specifically for deterministic power-fail detection and robust reset generation in mission-critical embedded systems operating across wide temperature and voltage ranges.

FAQ

What is the function of the CTL pin on the MAX700ESA+T?

The CTL (Control) pin on the MAX700ESA+T selects the voltage monitoring source: when CTL is tied to GND, the device monitors VCC directly for a 4.65V threshold; when CTL is tied to VCC, it monitors the SENSE pin instead, enabling external voltage detection using a resistor divider referenced to the internal 1.29V comparator threshold. This dual-mode capability makes the MAX700ESA+T adaptable to both standard +5V and custom-voltage applications without redesign.

Does the MAX700ESA+T require external components for basic +5V supervision?

No, the MAX700ESA+T requires no external components for basic +5V supervision. Its 4.65V reset threshold is factory-trimmed, and the internal 1.29V reference, debounced MR input, and open-drain RESET outputs eliminate the need for external resistors, capacitors, or diodes in standard configurations. Only an external pullup resistor on RESET is needed for most µP interfaces - a minimal, non-critical component not affecting timing or accuracy.

How does the HYST pin improve system reliability in noisy environments?

The HYST pin on the MAX700ESA+T connects to an internal ~1kΩ switch to GND, allowing users to add programmable hysteresis to the SENSE monitoring path. When enabled, this creates separate upper and lower reset thresholds - for example, triggering reset at 4.65V but releasing only at 4.80V - which prevents oscillatory resets caused by supply ripple or transient noise near the threshold. This feature is absent in simpler supervisors and directly enhances stability in electrically harsh settings like motor drives or automotive ECUs.

Can the MAX700ESA+T monitor voltages other than +5V?

Yes, the MAX700ESA+T can monitor voltages from 3V to 15V using its SENSE input. With CTL = VCC, the internal 1.29V comparator references an external resistor divider across the target voltage rail. For instance, a 12V rail can be scaled to 1.29V using a 10:1 divider, enabling precise brownout detection at any desired threshold. This capability is explicitly supported in the MAX700ESA+T datasheet and distinguishes it from fixed-threshold alternatives like the MAX702ESA+T.

What is the minimum VCC voltage at which the MAX700ESA+T guarantees valid RESET output?

The MAX700ESA+T guarantees correct RESET/RESET logic states down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures the reset signal remains asserted during deep brownouts - well below typical µP operational minimums - preventing illegal instruction execution or memory corruption. Unlike many supervisors that fail unpredictably below 2V, the MAX700ESA+T maintains functional integrity to 1V, a key reliability feature for safety-critical applications.