Analog Devices Inc./Maxim Integrated MAX6707ZKA+T

Overview

MAX6707ZKA+T from Maxim Integrated is a single-supply microprocessor supervisory IC with active-low open-drain reset output, independent watchdog timer (1.6s timeout), adjustable power-fail comparator (0.62V threshold), and manual reset input. It monitors +2.25V to +2.38V supply rails in industrial embedded systems requiring reliable brownout detection and orderly shutdown. Designed for critical µP power monitoring in white goods and networking equipment.

For engineers reviewing the MAX6707ZKA+T datasheet, MAX6707ZKA+T pinout, MAX6707ZKA+T application, or MAX6707ZKA+T equivalent, this page delivers verified functional identity, exact SOT23-8 pin mapping, confirmed 2.32V reset threshold at -40°C to +125°C, guaranteed reset validity down to VCC = 1V, and validated alternative options for single-voltage supervision with watchdog and PFI/PFO capability.

Technical Context

The MAX6707ZKA+T implements a precision voltage-monitoring architecture with three independent comparators: one fixed-threshold VCC monitor (2.32V nominal), one 0.62V reference-based power-fail input (PFI), and an internal manual reset circuit with 50kΩ pullup. Its watchdog timer asserts WDO low after 1.6s of no WDI edge transition and clears on any valid rising/falling edge or reset assertion.

Reset generation uses a 140ms timeout delay following VCC recovery above threshold, with immunity to short falling-VCC transients. The open-drain RESET and WDO outputs support flexible logic-level interfacing, while PFO provides active-low power-fail warning synchronized to PFI voltage crossing 0.62V ±9mV hysteresis.

Key Specifications

Pinout & Package

MAX6707ZKA+T is housed in an 8-pin SOT23 package with 0.65mm pitch, JEDEC MO-178AC compliant, RoHS-compliant lead-free construction (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6707ZKA+T, MAX6707AKA+T offers faster WDO recovery but identical supervision thresholds, while TPS3808G125DBVR reduces feature set to basic reset-only operation-making MAX6707ZKA+T optimal for designs needing integrated power-fail warning and independent watchdog signaling.

Availability

MAX6707ZKA+T is available at Aetrix Electronics and suitable for industrial motor control, smart home gateway, telecom line card, and medical diagnostic sensor module applications requiring stable component supply across extended temperature ranges.

Supply support for MAX6707ZKA+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 industrial, computing, and communications markets, with emphasis on reliability and integration.

The MAX6701–MAX6708 family targets microprocessor power supervision in space-constrained, high-reliability systems-delivering reset, watchdog, and power-fail monitoring in a single 8-pin SOT23 package.

FAQ

What is the exact reset threshold voltage of MAX6707ZKA+T over temperature?

The MAX6707ZKA+T has a nominal reset threshold of 2.32V at -40°C to +125°C, with min/max limits of 2.24V and 2.40V respectively. This corresponds to the 'Z' suffix in the Threshold Suffix Guide and is specified for single-supply monitoring of +2.25V to +2.38V rails. The 60ppm/°C temperature coefficient ensures stable trip points across industrial operating conditions.

Does MAX6707ZKA+T support both push-pull and open-drain reset outputs?

No, MAX6707ZKA+T features an active-low open-drain RESET output only, as indicated by its '7' designation in the MAX6701–MAX6708 family matrix. It does not include internal pullup circuitry for push-pull operation. External pullup resistors are required on the RESET pin to interface with standard CMOS inputs, and the same applies to WDO and PFO outputs.

How does the watchdog timer in MAX6707ZKA+T interact with the manual reset input?

In MAX6707ZKA+T, pulling MR low asserts both RESET and WDO simultaneously. The watchdog timer remains cleared while MR is held low, and resumes counting only after MR is released and RESET deasserts. Unlike A-versions, the standard MAX6707ZKA+T requires a valid WDI edge to clear WDO after timeout-MR assertion alone does not deassert WDO unless the watchdog has not yet timed out.

Can MAX6707ZKA+T monitor voltages other than VCC?

Yes, MAX6707ZKA+T can monitor secondary supplies using the PFI pin with an external resistor divider. The internal 0.62V reference allows setting custom trip points-for example, a +5V rail can be monitored by selecting R1/R2 to produce 0.62V at PFI when the rail drops to 4.8V. PFO then signals this condition with 1µs delay, enabling µP-initiated shutdown before critical failure.

What is the minimum VCC required for MAX6707ZKA+T to guarantee valid RESET output?

MAX6707ZKA+T guarantees RESET output validity down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, RESET becomes high-impedance. This specification ensures deterministic reset behavior during deep brownout conditions common in battery-powered or unregulated supply applications.