Analog Devices Inc./Maxim Integrated MAX6706LKA

Overview

MAX6706LKA from Maxim Integrated is an active-high push-pull microprocessor supervisory IC that monitors a single supply voltage, provides independent power-fail detection (0.62V threshold), manual reset input with 50kΩ internal pullup, and a 1.6s watchdog timer with independent WDO output. It operates from 2.1V to 5.5V and guarantees valid reset assertion down to VCC = 1V, targeting embedded controllers and automotive power monitoring systems.

For engineers reviewing the MAX6706LKA datasheet, MAX6706LKA pinout, MAX6706LKA application, or MAX6706LKA equivalent, this device delivers precise single-supply supervision with integrated power-fail warning, manual reset debouncing, and watchdog timeout handling - critical for reliable µP startup, brownout recovery, and system-level fault response in industrial and automotive electronics.

Technical Context

The MAX6706LKA implements a dedicated reset generator with 140ms timeout delay and a separate watchdog circuit that asserts WDO low if WDI is not toggled within 1.6s (typ). Its active-high RESET output is powered by VCC and remains valid down to 1V, while the PFI comparator uses an internal 0.62V reference to detect early power-fail conditions on external supplies.

Unlike dual- or triple-voltage variants, the MAX6706LKA supports only single-supply monitoring via VCC, with no RST_IN1/RST_IN2 inputs. Its pinout excludes N.C. and dual-reset outputs, and it belongs to the A-version family where WDO deasserts immediately upon VCC recovery - not after a timeout delay - and can be cleared by pulling MR low.

Key Specifications

Pinout & Package

MAX6706LKA is housed in an 8-pin SOT23-8 package (3.0mm × 1.75mm × 1.3mm), optimized for space-constrained PCB layouts in automotive and industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6702LKA and MAX6706AKA, the MAX6706LKA uniquely combines active-high reset, integrated power-fail detection, and watchdog supervision in a single SOT23-8 package - making it optimal for safety-critical embedded systems requiring layered fault response without layout changes.

Availability

MAX6706LKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, smart meter subsystems, and medical diagnostic sensor hubs requiring stable component supply across extended temperature ranges.

Supply support for MAX6706LKA 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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX6701–MAX6708 family was designed specifically for robust microprocessor supervision in harsh environments, integrating reset generation, watchdog timing, and power-fail warning into ultra-small packages for space- and reliability-constrained applications.

FAQ

What is the reset threshold voltage for MAX6706LKA?

The MAX6706LKA has a nominal VCC reset threshold of 4.38V (L suffix), with ±3% tolerance over the full -40°C to +125°C operating range. This value is factory-trimmed and guaranteed in production test, ensuring consistent brownout detection for +5V systems. The threshold applies solely to the VCC supply pin and does not extend to PFI or other inputs.

Does MAX6706LKA support dual-supply monitoring?

No, MAX6706LKA supports only single-supply monitoring via the VCC pin. Unlike MAX6701(A)/MAX6702(A)/MAX6703(A) variants, it does not include RST_IN1 or RST_IN2 inputs for adjustable secondary voltage supervision. Its architecture is optimized for systems with one primary regulated rail, using PFI/PFO for auxiliary supply monitoring instead.

How does the watchdog behavior differ between MAX6706LKA and non-A versions?

The MAX6706LKA is an A-version device: its WDO output deasserts immediately when VCC recovers above threshold, without waiting for a timeout delay. In contrast, non-A versions latch WDO low until a valid WDI edge is detected. This makes MAX6706LKA more responsive to transient brownouts and eliminates dependency on firmware intervention for WDO clearance.

Can MAX6706LKA's PFO output drive a microcontroller interrupt pin directly?

Yes, MAX6706LKA's PFO is an active-low open-drain output rated for 3.2mA sink current at VCC ≥ 4.25V. It can directly assert a standard CMOS or TTL interrupt input (e.g., NMI or INT0) when pulled up to the same VCC rail. No level-shifting or buffering is needed, provided the µP interrupt pin accepts 0.4V max low-level voltage under load.

What is the minimum VCC required for guaranteed RESET output validity in MAX6706LKA?

MAX6706LKA guarantees valid RESET output behavior down to VCC = 1V. Below 1V, the push-pull driver ceases sinking current and enters high-impedance state. For systems requiring reset assertion all the way to ground, an external pull-down resistor (e.g., 100kΩ) on the RESET line is recommended - but only for push-pull variants like MAX6706LKA.