Analog Devices Inc./Maxim Integrated MAX6703YKA+T

Overview

MAX6703YKA+T from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low open-drain reset output, manual reset input, watchdog timer with independent WDO output, and dual adjustable reset inputs for triple-voltage monitoring. It features a 2.19V V_CC reset threshold (Y-suffix), 140ms reset timeout, 1.6s watchdog timeout, and guaranteed reset validity down to V_CC = 1V. It is used in critical µP power monitoring for white goods and networking equipment.

For engineers reviewing the MAX6703YKA+T datasheet, MAX6703YKA+T pinout, MAX6703YKA+T application, or MAX6703YKA+T equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in multivoltage embedded systems, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The MAX6703YKA+T implements a triple-supply supervision architecture: primary V_CC monitoring at 2.19V (Y-threshold), plus two user-adjustable reset inputs (RST_IN1/RST_IN2) referenced to a 0.62V internal comparator. Its watchdog timer asserts WDO low after 1.6s of no WDI edge transition and clears on any valid WDI toggle or MR assertion.

Reset generation uses a precision bandgap reference and temperature-compensated threshold (60 ppm/°C), with hysteresis ensured via internal design. The open-drain RESET output supports flexible pull-up configurations, while WDO operates independently-enabling NMI-triggered fault handling without interfering with main reset sequencing.

Key Specifications

Pinout & Package

Package: 8-pin SOT23, surface-mount, RoHS-compliant lead-free (+T suffix), -40°C to +125°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6703YKA+T, MAX6703YKA-T offers identical supervision functionality with leaded packaging for compatibility with legacy processes, while MAX6705YKA+T reduces feature set to single-rail monitoring-simplifying design but eliminating triple-voltage coordination needed in complex embedded systems.

Availability

MAX6703YKA+T is available at Aetrix Electronics and suitable for computers, networking equipment, and white goods requiring stable component supply with guaranteed long-term availability and full RoHS compliance.

Supply support for MAX6703YKA+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) designs precision analog and mixed-signal ICs for demanding industrial, communications, and computing applications.

The MAX6701–MAX6708 family targets cost-sensitive, space-constrained embedded systems needing robust, multivoltage µP supervision with integrated watchdog and power-fail warning-replacing discrete solutions in appliances, infrastructure, and instrumentation.

FAQ

What is the reset threshold voltage of the MAX6703YKA+T?

The MAX6703YKA+T has a nominal V_CC reset threshold of 2.19V at -40°C to +85°C, with a guaranteed range of 2.11V to 2.27V over -40°C to +125°C. This Y-suffix threshold is optimized for +2.1V to +2.75V supply rails. The MAX6703YKA+T uses a precision bandgap reference with 60 ppm/°C temperature coefficient to maintain accuracy across its full operating range.

Does the MAX6703YKA+T support triple-voltage monitoring?

Yes, the MAX6703YKA+T supports triple-voltage monitoring via its dedicated RST_IN1 and RST_IN2 pins, each referenced to a 0.62V internal comparator. These inputs accept externally configured resistor dividers to set custom thresholds for secondary system rails. When any of V_CC, RST_IN1, or RST_IN2 falls below its respective threshold, the MAX6703YKA+T asserts its active-low open-drain RESET output for the full 140ms timeout period.

What is the function of the WDO pin on the MAX6703YKA+T?

The WDO (Watchdog Output) pin on the MAX6703YKA+T is an independent active-low open-drain output that asserts when the watchdog timer expires (after 1.6s without a WDI edge) or when V_CC, RST_IN1, or RST_IN2 falls below threshold. In the A-version (denoted by 'A' in MAX6703A), WDO deasserts immediately upon recovery of the undervoltage condition or a valid WDI transition-unlike non-A versions where WDO remains latched until cleared by WDI.

Can the MAX6703YKA+T be used with a 3.3V supply?

No-the MAX6703YKA+T is specifically configured for 2.1V–2.75V supplies (Y-suffix). Using it with 3.3V would cause immediate reset assertion since V_CC exceeds the 2.27V maximum threshold. For +3.3V systems, select MAX6703S or MAX6703T variants (2.93V or 3.08V thresholds). The MAX6703YKA+T's internal circuitry is calibrated for low-voltage operation and does not support higher supply rails.

How does the manual reset (MR) input interact with the watchdog function in the MAX6703YKA+T?

In the MAX6703YKA+T (an A-version), pulling MR low both forces a system reset and deasserts WDO-providing hardware-level watchdog clearing without requiring a WDI edge. This allows service-mode reset initiation while simultaneously releasing the watchdog alarm. MR has an internal 50kΩ pullup to V_CC, is CMOS-compatible, and accepts pulses as short as 1µs. The MAX6703YKA+T's MR input also debounces mechanical switches via its inherent reset timeout duration.