Analog Devices Inc./Maxim Integrated MAX6706TKA

Overview

MAX6706TKA from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit in an 8-pin SOT23 package, designed to monitor a single supply voltage (2.93V threshold), provide a 140ms reset timeout, deliver independent watchdog output (WDO), and support power-fail warning via PFI/PFO with 0.62V reference. It ensures reliable µP reset during power-up, brownout, and manual trigger events in industrial controllers and embedded systems.

For engineers reviewing the MAX6706TKA datasheet, MAX6706TKA pinout, MAX6706TKA application, or MAX6706TKA equivalent, key selection criteria include its active-high reset output, guaranteed reset validity down to VCC = 1V, 1.6s watchdog timeout, and compatibility with +3.3V/+2.5V system rails requiring precise undervoltage detection and fail-safe recovery.

Technical Context

The MAX6706TKA implements a dual-comparator architecture: one fixed-threshold comparator for VCC supervision (2.93V) and a separate 0.62V-referenced comparator for PFI-based power-fail monitoring. Its reset generator asserts RESET high when VCC falls below threshold and holds it for 140ms after recovery.

The integrated watchdog timer monitors WDI transitions and asserts WDO low on timeout (1.6s typ); WDO deasserts immediately upon valid WDI edge or MR low assertion in A-version operation. Reset and WDO outputs are push-pull, eliminating external pull-ups.

Key Specifications

Pinout & Package

MAX6706TKA is housed in an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), optimized for space-constrained PCB layouts in portable and automotive electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6706TKA, MAX6706TSA+ offers improved threshold accuracy for critical 3.3V supervision, while TPS3808G33DBVR sacrifices PFI/PFO and WDO functionality for lower cost in simpler reset-only applications.

Availability

MAX6706TKA is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and networking edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6706TKA 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX670x family delivers compact, low-power µP supervisors with integrated power-fail detection and watchdog timers, targeting space- and reliability-critical embedded systems needing robust power sequencing and fault recovery.

FAQ

What is the reset threshold voltage for MAX6706TKA and how is it specified?

The MAX6706TKA has a nominal reset threshold of 2.93V (VCC falling), corresponding to the 'T' suffix in the Threshold Suffix Guide. This value is guaranteed over -40°C to +125°C with ±2.5% tolerance. The threshold is factory-trimmed and applies specifically to the VCC supply monitoring function; it does not apply to PFI or RST_IN inputs, which use a separate 0.62V internal reference. MAX6706TKA maintains valid reset assertion down to VCC = 1.2V.

Does MAX6706TKA support active-high reset output and what are its drive capabilities?

Yes, MAX6706TKA features an active-high push-pull RESET output (pin 7), unlike open-drain alternatives that require external pull-ups. It sources up to 800µA at VCC ≥ 4.75V while maintaining VOH ≥ 0.8 × VCC, and sinks up to 3.2mA while holding VOL ≤ 0.4V. This eliminates BOM components and ensures fast, deterministic logic levels directly compatible with modern µP reset inputs. MAX6706TKA's push-pull architecture guarantees valid output down to VCC = 1V.

How does the watchdog function operate in MAX6706TKA and what is its timeout period?

The MAX6706TKA watchdog timer monitors the WDI input (pin 6) and asserts WDO low if no edge is detected within 1.6s (typical). As an A-version device, WDO deasserts immediately upon a valid WDI transition or MR low assertion-no timeout delay is required for clearing. The watchdog cannot be disabled and resets automatically on any VCC, RST_IN, or MR-induced reset event. MAX6706TKA's WDO operates independently of the RESET output, enabling concurrent fault signaling and reset control.

Can MAX6706TKA monitor voltages other than VCC, and how is the power-fail function implemented?

Yes, MAX6706TKA monitors secondary supplies via the PFI input (pin 4), which connects to an internal 0.62V comparator. By applying a resistor divider from the target supply to PFI, designers set custom trip points-for example, a 5V rail trips at 4.5V using a 7.2:1 ratio. When PFI falls below 0.62V, PFO (pin 5) goes low to signal impending failure. This function is fully independent of VCC supervision and operates across the full 1.2V–5.5V supply range. MAX6706TKA's PFI input draws only ±200nA, enabling high-impedance divider networks.

What package type and environmental rating does MAX6706TKA have?

MAX6706TKA is packaged in an 8-pin SOT23-8 case (3.00mm × 1.75mm × 1.30mm) with 0.65mm lead pitch, compliant with JEDEC MO-178 BA. It is rated for operation from -40°C to +125°C and qualified for automotive and industrial applications. Both leaded (-T) and lead-free (+T) variants are available; MAX6706TKA uses the -T suffix indicating standard leaded packaging. The device features BiCMOS process technology and 716 transistor count, ensuring robust performance in thermally stressed environments.