Analog Devices Inc./Maxim Integrated MAX6707ASKA+T

Overview

MAX6707ASKA+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 telecom equipment.

For engineers reviewing the MAX6707ASKA+T datasheet, MAX6707ASKA+T pinout, MAX6707ASKA+T application, or MAX6707ASKA+T equivalent, this device delivers precision voltage monitoring for +3.0V systems, guaranteed reset validity down to VCC = 1V, immunity to short VCC transients, and design-ready integration with minimal external components.

Technical Context

The MAX6707ASKA+T implements a dedicated reset generator with internal 140ms timeout delay, a separate watchdog circuit that asserts WDO low upon 1.6s WDI inactivity, and an uncommitted comparator with PFI input referenced to 0.62V and open-drain PFO output. It supports only single-supply supervision (VCC only) - no RST_IN1/RST_IN2 inputs.

Its A-version architecture ensures WDO deasserts immediately when VCC recovers above threshold (no timeout delay), and WDO can be cleared by pulling MR low - unlike non-A variants where WDO latches until WDI toggles. Reset output is active-low open-drain, compatible with 1.0V–5.5V VCC operation.

Key Specifications

Pinout & Package

MAX6707ASKA+T is housed in an 8-pin SOT23 package (package code K8+2), RoHS-compliant, lead-free, tape-and-reel format (+T suffix). Pinout is identical across MAX6705–MAX6707(A) family members.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6707MTA+T and TPS3808G30DBVR, MAX6707ASKA+T uniquely combines +3.0V-specific reset accuracy, integrated PFI/PFO for predictive power-fail response, and A-version watchdog behavior - making it optimal for cost-sensitive, space-constrained industrial controllers requiring both reliability and diagnostic visibility.

Availability

MAX6707ASKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecom power modules, white goods control boards, and intelligent instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX6707ASKA+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, communications, and computing applications.

The MAX6701–MAX6708 family targets compact, low-power microprocessor supervision - delivering integrated reset, watchdog, and power-fail functions in minimal footprint for space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6707ASKA+T and how is it specified?

The MAX6707ASKA+T has a nominal reset threshold of 3.08V, with guaranteed min/max limits of 2.97V to 3.17V over –40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VTH" for suffix 'S' (3.00–3.15V at +25°C, extended range per datasheet Table 1). The 'A' in the part number denotes the A-version watchdog behavior, not threshold variation.

Does MAX6707ASKA+T support monitoring multiple supply rails like VCC, VDDIO, and AVDD?

No - MAX6707ASKA+T monitors only the VCC supply rail for reset generation. Unlike MAX6701–MAX6703(A) variants, it lacks RST_IN1 and RST_IN2 pins. However, its PFI input enables indirect monitoring of secondary rails (e.g., 1.8V, 2.5V) via external resistor dividers, with PFO providing corresponding early-warning output.

How does the watchdog behavior of MAX6707ASKA+T differ from non-A versions like MAX6707SKA+T?

MAX6707ASKA+T's WDO deasserts immediately when VCC rises above threshold after undervoltage - no timeout delay. In contrast, non-A versions require a valid WDI edge to clear WDO. Also, pulling MR low clears WDO in MAX6707ASKA+T, whereas non-A versions latch WDO until WDI toggles - a key distinction for fail-safe NMI handling.

Can MAX6707ASKA+T be used with a 1.8V supply voltage?

Yes - MAX6707ASKA+T operates from VCC = 1.0V to 5.5V and guarantees reset validity down to VCC = 1V. At 1.8V, its 3.08V reset threshold is inactive (VCC < VTH), so RESET remains asserted. It is intended for supervision of 3.0V rails; for 1.8V supervision, use MAX6707YKA+T (2.19V threshold) instead.

What is the function of the PFI and PFO pins on MAX6707ASKA+T, and how are they typically connected?

PFI is a high-impedance input referenced to an internal 0.62V comparator; it accepts a resistor divider from any monitored voltage (e.g., 5V, 3.3V, 2.5V) to set a custom trip point. PFO is its open-drain output, asserted low when PFI < 0.62V. Typical use connects PFO to a µP interrupt pin for early power-fail warning, allowing orderly shutdown before RESET activates.