Analog Devices Inc./Maxim Integrated MAX707ESA

Overview

MAX707ESA from Maxim Integrated is a precision microprocessor supervisory circuit with active-high RESET output, 4.65V supply-voltage monitor threshold, 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot and brownout recovery in industrial controllers and embedded systems.

For engineers reviewing the MAX707ESA datasheet, MAX707ESA pinout, MAX707ESA application, or MAX707ESA equivalent, key selection criteria include guaranteed RESET validity down to VCC = 1.2V, SO-8 package compatibility, −40°C to +85°C industrial temperature range, and functional distinction from watchdog-equipped variants like MAX705ESA.

Technical Context

The MAX707ESA integrates four core supervisory functions: a precision voltage monitor triggering reset at 4.65V ±1.5%, an active-high RESET output with 200ms minimum pulse width, a 1.25V reference-based power-fail comparator (PFI/PFO), and a TTL/CMOS-compatible manual-reset input with internal 250μA pull-up. It lacks a watchdog timer - unlike MAX705/MAX706 - and substitutes active-high RESET for WDO.

This variant belongs to the MAX705–MAX708 family where MAX707/MAX708 replace the watchdog output with dual active-high/active-low reset outputs. Its reset assertion is synchronized to VCC crossing the 4.65V threshold, and RESET remains valid down to VCC = 1.2V with ISINK = 100μA, enabling robust low-voltage operation during brownout.

Key Specifications

Pinout & Package

MAX707ESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm lead pitch and JEDEC MS-012AC outline. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX707ESA, MAX707CSA trades industrial temperature support for lower cost, while MAX813LESA adds watchdog functionality at the expense of active-low RESET - making MAX707ESA optimal for dual-polarity reset demand in harsh environments without watchdog overhead.

Availability

MAX707ESA is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic equipment, smart energy meters, ruggedized network routers, and critical μP power monitoring requiring stable component supply across extended temperature ranges.

Supply support for MAX707ESA 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, with emphasis on reliability and integration.

The MAX705–MAX708 family was engineered specifically for cost-effective, board-space-efficient microprocessor supervision - delivering voltage monitoring, reset generation, power-fail warning, and manual reset in a single SO-8 package.

FAQ

What is the reset threshold voltage for MAX707ESA?

The MAX707ESA has a nominal reset threshold of 4.65V with ±1.5% tolerance over its full −40°C to +85°C operating range. This threshold is factory-trimmed and does not require external calibration. The device asserts active-high RESET when VCC rises above this level and maintains it for a minimum of 140ms, ensuring reliable microprocessor initialization. This value is confirmed in the Electrical Characteristics table of the official MAX705–MAX708/MAX813L datasheet.

Does MAX707ESA include a watchdog timer function?

No, the MAX707ESA does not include a watchdog timer. Unlike the MAX705ESA or MAX706ESA, the MAX707ESA replaces the watchdog output (WDO) with an active-high RESET output and leaves pin 8 unconnected (N.C.). Its block diagram confirms absence of watchdog circuitry. This makes MAX707ESA appropriate for systems requiring dual-polarity reset signaling without watchdog supervision overhead - a deliberate functional differentiation within the MAX705–MAX708 family.

What is the minimum supply voltage at which MAX707ESA guarantees valid RESET output?

The MAX707ESA guarantees valid active-high RESET output down to VCC = 1.2V with ISINK = 100μA, as specified in the Electrical Characteristics table under "RESET Output Voltage" for MAX707E/M grade devices. This ensures robust reset assertion during deep brownout conditions where other supervisory circuits may fail. The specification is tested and guaranteed across the full −40°C to +85°C temperature range, supporting fail-safe operation in demanding industrial applications.

Can MAX707ESA monitor voltages other than +5V?

Yes, the MAX707ESA can monitor voltages other than +5V using its PFI (Power-Fail Input) pin, which compares against an internal 1.25V reference. By connecting a resistor divider from the target voltage rail to PFI, users can configure early-warning detection for +3.3V, +12V, or even negative rails (with external transistor circuitry). The PFI input draws only ±25nA, minimizing loading error. This capability is documented in the Applications Information section of the MAX705–MAX708/MAX813L datasheet.

What package type is used for MAX707ESA?

The MAX707ESA is supplied in an 8-pin SO (Small Outline) package, also referred to as SOIC-8 or SO-8, with JEDEC MS-012AC outline and 1.27mm lead pitch. It is RoHS-compliant and available in both leaded and lead-free versions (the "+" suffix denotes lead-free). This surface-mount package supports automated PCB assembly and provides thermal and mechanical reliability suitable for industrial-grade products - distinct from the DIP or μMAX variants in the same family.