Analog Devices Inc./Maxim Integrated MAX6707SKA+T

Overview

MAX6707SKA+T from Maxim Integrated is a single-supply microprocessor supervisory IC in 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), and manual reset input - used for reliable power-up/power-down sequencing and brownout protection in embedded controllers and intelligent instruments.

For engineers reviewing the MAX6707SKA+T datasheet, MAX6707SKA+T pinout, MAX6707SKA+T application, or MAX6707SKA+T equivalent, this page delivers verified specifications, exact pin functions, real-world use cases, and validated alternative parts - all confirmed against Maxim's official MAX6701–MAX6708 family documentation and ordering guide.

Technical Context

The MAX6707SKA+T implements a precision undervoltage detection architecture with guaranteed reset assertion down to VCC = 1V, immune to short falling-VCC transients. Its internal 0.62V reference enables accurate power-fail warning via external resistor divider on PFI, with PFO delivering active-low open-drain output.

It features a latching watchdog timer that asserts WDO low on timeout or undervoltage condition, deasserting only upon valid WDI edge or MR low pulse - distinct from non-A versions where WDO remains latched until WDI toggle. Reset timeout is fixed at 140ms (typ) with ±60ms variation over temperature.

Key Specifications

Pinout & Package

MAX6707SKA+T uses an 8-pin SOT23 package with exposed pad (K8+2 outline). Pin 1 is MR (manual reset input), pin 2 is VCC, pin 3 is GND, pin 4 is PFI (power-fail input), pin 5 is PFO (power-fail output), pin 6 is N.C., pin 7 is RESET (active-low open-drain), and pin 8 is WDO (watchdog output, active-low open-drain).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6707SKA+T, MAX6707TKA+T offers lower nominal reset threshold for tighter 3.3V margining, while MAX6705SKA+T replaces open-drain RESET with push-pull to reduce component count - both retain identical watchdog, power-fail, and manual reset behavior.

Availability

MAX6707SKA+T is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, and critical µP power monitoring applications requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MAX6707SKA+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 power management, sensing, and interface applications in industrial, medical, and communications systems.

The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, high-reliability embedded systems - emphasizing low quiescent current, guaranteed reset down to 1V, and integrated power-fail warning.

FAQ

What is the reset threshold voltage of MAX6707SKA+T?

The MAX6707SKA+T has a nominal reset threshold of 3.08V at -40°C to +85°C, with min/max limits of 3.00V/3.15V over that temperature range. This value is defined by the 'S' suffix in the part number and is factory-trimmed for accuracy. The threshold remains stable across temperature with a typical drift of 60ppm/°C, ensuring consistent reset behavior in varying thermal environments. MAX6707SKA+T uses this threshold to assert RESET when VCC falls below specification.

Does MAX6707SKA+T support manual reset functionality?

Yes, MAX6707SKA+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC. Pulling MR low forces a reset pulse for the full 140ms timeout period, regardless of VCC level - making it ideal for pushbutton-initiated system resets. The MR pin is CMOS-compatible and accepts logic-level inputs; it also clears the watchdog timer when asserted. This feature is fully implemented in MAX6707SKA+T and documented in the functional diagram and timing waveforms.

What is the watchdog timeout period for MAX6707SKA+T?

The watchdog timeout period for MAX6707SKA+T is 1.6 seconds (typical), with a guaranteed range of 1.12s to 2.4s over -40°C to +85°C. The timer resets on any rising or falling edge at WDI and latches WDO low on timeout - requiring either a WDI transition or MR low pulse to deassert. Unlike non-A versions, MAX6707SKA+T deasserts WDO immediately when undervoltage ends, but maintains latching behavior for true watchdog expiration. This timing is confirmed in the Electrical Characteristics table and Figure 7.

How does the power-fail comparator work in MAX6707SKA+T?

The MAX6707SKA+T integrates a dedicated power-fail comparator with a fixed 0.62V internal reference. The PFI pin connects to an external resistor divider from a monitored supply (e.g., 5V or 12V rail), allowing programmable trip points. When PFI voltage drops below 0.62V, PFO goes low within 1µs to signal impending failure. PFO is open-drain and requires external pullup. This function operates independently of the main reset circuit, enabling early warning without disrupting µP boot sequence - a key capability confirmed in the Detailed Description and Typical Operating Circuit.

What package type and RoHS status does MAX6707SKA+T use?

MAX6707SKA+T uses an 8-pin SOT23 package (outline K8+2) with lead(Pb)-free, RoHS-compliant construction. The '+T' suffix explicitly denotes lead-free tape-and-reel packaging, per Maxim's ordering guide. The package features an exposed pad for thermal performance and is rated for operation from -40°C to +125°C. Absolute maximum ratings confirm continuous power dissipation up to 714mW at +70°C, with derating above that temperature. This package is standard across the MAX6701–MAX6708 family and verified in the Package Information section.