Analog Devices Inc./Maxim Integrated MAX6706MKA-T

Overview

MAX6706MKA-T from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for single-supply voltage monitoring in embedded systems. It provides a guaranteed-reset output down to VCC = 1V, features a 140ms reset timeout delay, includes an independent adjustable power-fail comparator (PFI/PFO), and delivers a 1.6s watchdog timeout with independent WDO output - all in an 8-pin SOT23 package for space-constrained industrial controllers and telecom power management.

For engineers reviewing the MAX6706MKA-T datasheet, MAX6706MKA-T pinout, MAX6706MKA-T application, or MAX6706MKA-T equivalent, key selection criteria include its active-high reset logic, 2.63V reset threshold (suffix 'R'), compatibility with 2.55V–3.6V supply rails, and integrated manual reset input with internal 50kΩ pullup - critical for reliable brownout recovery and watchdog-triggered system restarts.

Technical Context

The MAX6706MKA-T implements a dual-comparator architecture: one fixed-threshold monitor for VCC (2.63V) and a second adjustable comparator for PFI referenced to 0.62V. Its reset generator holds RESET high for ≥140ms after VCC rises above threshold, while the watchdog timer clears on any WDI edge and asserts WDO low upon 1.6s timeout - independent of reset state.

This A-version device deasserts WDO immediately when undervoltage conditions clear (no timeout delay), unlike standard versions; it also allows WDO deassertion by pulling MR low. The active-high push-pull RESET output ensures direct interface with µP reset inputs requiring high-active assertion without external inversion.

Key Specifications

Pinout & Package

Package: 8-pin SOT23, surface-mount, RoHS-compliant (lead-free version uses '+T' suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6706AKA-T and TPS3808G33DBVR, the MAX6706MKA-T uniquely combines active-high push-pull RESET, MR-controllable WDO, and independent PFI/PFO in a single 8-pin SOT23 - enabling compact, self-contained supervision for complex multi-rail systems without external logic.

Availability

MAX6706MKA-T is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, white goods MCU systems, and critical µP power monitoring requiring stable component supply across extended temperature ranges.

Supply support for MAX6706MKA-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, automotive, and communications applications.

The MAX6701–MAX6708 family was engineered specifically for robust, low-power microprocessor supervision in multivoltage embedded systems - emphasizing guaranteed reset validity, watchdog autonomy, and flexible power-fail detection.

FAQ

What is the reset threshold voltage of the MAX6706MKA-T?

The MAX6706MKA-T has a factory-trimmed reset threshold of 2.63V (±30mV over -40°C to +125°C), corresponding to the 'R' suffix in its ordering code. This value is guaranteed across full temperature range and enables precise supervision of +2.5V and +2.7V supply rails without external calibration components. The MAX6706MKA-T maintains this accuracy using on-chip bandgap references and laser-trimmed resistors.

Does the MAX6706MKA-T support active-high reset output?

Yes, the MAX6706MKA-T provides an active-high push-pull RESET output - a key differentiator from many supervisors that offer only active-low variants. This allows direct connection to microprocessors requiring high-active reset assertion, eliminating external inverters or pullup resistors. The MAX6706MKA-T's RESET remains high for ≥140ms after VCC exceeds 2.63V, ensuring reliable µP initialization.

How does the watchdog timer in the MAX6706MKA-T operate?

The MAX6706MKA-T watchdog timer times out after 1.6s if no edge is detected on WDI. Upon timeout, WDO goes low and stays low until cleared by either a WDI edge or pulling MR low - a feature unique to the 'A' version. Unlike non-A variants, the MAX6706MKA-T deasserts WDO immediately when undervoltage clears, enabling faster system recovery. The timer resets automatically on any VCC/RST_IN reset or MR assertion.

Can the MAX6706MKA-T monitor secondary power supplies?

Yes, the MAX6706MKA-T includes a dedicated PFI input with a 0.62V internal reference, allowing configurable monitoring of secondary supplies (e.g., +5V fans, +12V analog rails) via external resistor dividers. When PFI drops below 0.62V, PFO asserts low to signal impending failure. This capability is fully independent of the main VCC monitor and enables early-warning power-fail detection without µP intervention.

What package and environmental ratings does the MAX6706MKA-T have?

The MAX6706MKA-T is housed in an 8-pin SOT23 package (package code K8+2) rated for operation from -40°C to +125°C. It is offered in lead-free form (RoHS-compliant), with the '-T' suffix indicating tape-and-reel packaging. The device features guaranteed performance across its full temperature range, including 140ms reset timeout stability and 2.63V threshold accuracy - validated for industrial and extended-temperature applications.