Analog Devices Inc./Maxim Integrated MAX6707TKA+T

Overview

MAX6707TKA+T from Maxim Integrated is a single-supply microprocessor supervisory IC in an 8-pin SOT23 package, providing active-low open-drain reset output, independent watchdog timer with 1.6s timeout, adjustable power-fail comparator (0.62V threshold), manual reset input, and guaranteed reset validity down to VCC = 1.0V. It monitors +3.0V systems (3.08V nominal reset threshold) for power-up, brownout, and power-down conditions in embedded controllers and telecom infrastructure.

For engineers reviewing the MAX6707TKA+T datasheet, MAX6707TKA+T pinout, MAX6707TKA+T application, or MAX6707TKA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters (140ms reset timeout, 1.6s watchdog), real-world supervision use cases, and two validated alternative parts with documented technical and application differences.

Technical Context

The MAX6707TKA+T implements a precision voltage-monitoring architecture with three independent comparators: one for VCC (3.08V threshold), one for PFI (0.62V reference), and one for MR input validation. Its watchdog circuit asserts WDO low after 1.6s of no WDI edge transition, and deasserts only upon valid WDI toggle or MR pull-low - not automatically on recovery.

Reset generation uses a 140ms internal timeout timer triggered by VCC falling below threshold, MR assertion, or (in A-version) undervoltage at PFI. The open-drain RESET and WDO outputs support flexible interface logic levels, while the 50kΩ internal MR pullup enables pushbutton reset without external components.

Key Specifications

Pinout & Package

MAX6707TKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6707TKA+T and TPS3808G30DBVR, MAX6707TKA+T uniquely combines 3.08V precision reset, 0.62V adjustable power-fail detection, and independent 1.6s watchdog output in a single 8-pin SOT23 - enabling compact, feature-complete supervision without external components.

Availability

MAX6707TKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, white goods MCU supervision, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6707TKA+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6701–MAX6708 family targets space-constrained µP systems needing integrated reset, watchdog, and power-fail monitoring - specifically optimized for reliability-critical embedded control and infrastructure equipment.

FAQ

What is the exact reset threshold voltage for MAX6707TKA+T?

The MAX6707TKA+T has a nominal VCC reset threshold of 3.08V, with guaranteed min/max limits of 2.97V and 3.17V over the full -40°C to +125°C operating temperature range. This value is defined by the 'T' suffix in the part number and is factory-trimmed for precision, ensuring accurate supervision of +3.0V supply rails without external calibration.

Does MAX6707TKA+T include a watchdog timer, and what is its timeout period?

Yes, MAX6707TKA+T includes a watchdog timer with a typical timeout period of 1.6 seconds. The timer resets on any rising or falling edge at the WDI pin and asserts the WDO output low if no edge occurs within that interval. The timeout is specified from 0.96s (min) to 2.52s (max) across temperature, supporting robust firmware health monitoring in real-time systems.

What is the function of the PFI and PFO pins on MAX6707TKA+T?

PFI is the power-fail input pin, internally referenced to a precise 0.62V comparator threshold. It accepts an external resistive divider to monitor secondary voltages (e.g., 12V, 5V). PFO is the corresponding open-drain output that goes low when PFI falls below 0.62V, enabling early-warning interrupts to the µP before main supply collapse - critical for orderly shutdown sequences.

Is MAX6707TKA+T compatible with 1.8V logic systems?

Yes, MAX6707TKA+T supports interfacing with 1.8V logic through its open-drain RESET and WDO outputs, which operate down to VCC = 1.0V and tolerate voltages up to 6.0V. When used with a 1.8V pullup resistor, these outputs deliver clean 0V/1.8V logic levels, and the MR input accepts 0.3×VCC/0.7×VCC thresholds - fully compatible with 1.8V CMOS signaling.

How does the manual reset (MR) input interact with the watchdog output (WDO) on MAX6707TKA+T?

On MAX6707TKA+T (the 'A' version), pulling MR low deasserts WDO immediately - a key difference from non-A versions. This allows firmware or hardware to clear a latched watchdog fault condition without waiting for a WDI edge. MR also forces RESET assertion for ≥200ns, providing synchronized system reset and watchdog clearance in safety-critical recovery sequences.