Analog Devices Inc./Maxim Integrated MAX701EPA

Overview

MAX701EPA from Maxim Integrated is a precision power-supply supervisory circuit for +5V microprocessor systems, providing dual active-low and active-high reset outputs with guaranteed valid state down to VCC = 1V, 4.65V factory-trimmed threshold, ≥200ms reset pulse width, and debounced manual-reset input. It operates across –40°C to +85°C in 8-pin PDIP packaging and is used in industrial controllers and embedded systems requiring reliable power-on/off reset sequencing.

For engineers reviewing the MAX701EPA datasheet, MAX701EPA pinout, MAX701EPA application, or MAX701EPA equivalent, key selection criteria include dual-reset output polarity, extended temperature support, no external component requirement for +5V operation, and compatibility with µP reset assertion timing standards (JEDEC JESD8-12A).

Technical Context

The MAX701EPA implements a voltage-monitoring comparator with internal 4.65V reference and built-in hysteresis (~30mV), ensuring noise-immune reset assertion during supply transients. Its dual-output architecture delivers simultaneous RESET (active-low) and RESET (active-high) signals, eliminating need for external inverters in systems requiring both polarities.

Reset assertion occurs when VCC falls below 4.65V (power-down) or remains below threshold for ≥200ms after power-up; the debounced MR input provides synchronous manual reset with 5µA internal pullup and 0.7V logic threshold. The device guarantees valid reset states down to VCC = 1V, supporting brownout detection in low-voltage edge cases.

Key Specifications

Pinout & Package

MAX701EPA is housed in an 8-pin plastic dual-inline package (PDIP) with 0.3-inch body width and through-hole mounting. Pin spacing conforms to JEDEC MS-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX701EPA, MAX692EPA reduces functionality by omitting the active-high output and shortening minimum reset pulse width, while TPS3808G33DBVR trades dual outputs and PDIP manufacturability for size and adjustability-making MAX701EPA optimal for legacy industrial designs needing guaranteed dual-polarity reset timing.

Availability

MAX701EPA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, and telecom line cards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX701EPA 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 reliability, integration, and low-power operation.

The MAX700/MAX701/MAX702 family was engineered specifically for robust power-supply supervision in microprocessor-based systems, delivering factory-trimmed accuracy and dual-output flexibility without external components.

FAQ

What is the reset threshold voltage of the MAX701EPA and how is it trimmed?

The MAX701EPA features a factory-trimmed reset threshold of 4.65V with ±150mV tolerance over its full operating temperature range (–40°C to +85°C). This precision is achieved via laser trimming during wafer sort, eliminating the need for external resistors or calibration. The threshold applies to VCC monitoring in default mode (CTL = GND), and the MAX701EPA guarantees correct reset assertion even as VCC declines to 1V-ensuring deterministic behavior during brownout conditions.

Does the MAX701EPA provide both active-low and active-high reset outputs?

Yes, the MAX701EPA provides two independent reset outputs: RESET (pin 3, active-low open-drain) and RESET (pin 4, active-high push-pull). This dual-output architecture allows direct interfacing with microprocessors, FPGAs, and peripherals requiring either polarity without external logic. The RESET output sinks up to 16mA, while RESET sources/sinks 3.2mA-supporting direct connection to standard CMOS/TTL inputs in most embedded systems using the MAX701EPA.

What is the minimum reset pulse width guaranteed by the MAX701EPA?

The MAX701EPA guarantees a minimum reset pulse width of 200ms during power-up, power-down, and low-voltage conditions. Typical pulse width is 350ms, with a maximum of 500ms. This duration exceeds JEDEC JESD8-12A requirements for microprocessor reset timing and ensures reliable initialization of CPUs, memory controllers, and peripheral ICs-even under slow-rising or noisy supply conditions where the MAX701EPA remains fully functional.

Can the MAX701EPA operate with supply voltages other than +5V?

Yes, the MAX701EPA operates with VCC from 1V to 15.5V and maintains valid reset output states across this full range. While optimized for +5V systems (with 4.65V threshold), it supports brownout detection in low-voltage applications (e.g., 3.3V or 2.5V rails) and can monitor higher auxiliary supplies. Its internal comparator and reference remain functional down to 1V VCC-making the MAX701EPA uniquely suited for fail-safe monitoring in multi-rail systems where primary and backup supplies must be validated independently.

Is the manual reset input (MR) debounced in hardware on the MAX701EPA?

Yes, the MR pin (pin 1) of the MAX701EPA includes integrated hardware debounce, eliminating the need for external RC filters or firmware debouncing routines. The input has a 5µA internal pullup and triggers reset when pulled below 0.7V. Debounce timing is designed to reject contact bounce from typical mechanical pushbuttons (≤10ms), ensuring clean, single-event reset assertion. This feature simplifies board design and improves system reliability in field-deployed equipment using the MAX701EPA.