Analog Devices Inc./Maxim Integrated MAX6706AZKA+

Overview

MAX6706AZKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for single-supply voltage monitoring in embedded systems. It provides a guaranteed-reset output down to VCC = 1V, 140ms reset timeout delay, 1.6s watchdog timeout, independent power-fail comparator (0.62V threshold), and manual reset input - all in an 8-pin SOT23 package for space-constrained industrial controllers and telecom power management.

For engineers reviewing the MAX6706AZKA+ datasheet, MAX6706AZKA+ pinout, MAX6706AZKA+ application, or MAX6706AZKA+ equivalent, key selection criteria include its active-high reset output stage, Z-suffix 2.32V reset threshold (±3% over –40°C to +125°C), watchdog independence from reset assertion, and compatibility with 2.1V–2.75V supply rails in white goods and intelligent instrumentation.

Technical Context

The MAX6706AZKA+ implements a dual-comparator architecture: one fixed-threshold monitor for VCC (2.32V nominal) and a separate 0.62V reference-based comparator for PFI/PFO power-fail warning. Its watchdog timer operates independently of reset generation and clears only on WDI edge transitions or MR assertion - not on VCC recovery alone.

Unlike MAX6704/MAX6708, it delivers both RESET and WDO as active-low push-pull outputs, while its RESET output is active-high per pin configuration. The device guarantees valid reset assertion even as VCC falls to 1V, and features 60ppm/°C reset threshold temperature coefficient and immunity to sub-100ns VCC transients.

Key Specifications

Pinout & Package

MAX6706AZKA+ is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (indicated by '+' suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6706AKA+, MAX6706AZKA+ provides superior threshold accuracy (±3% vs ±5%) critical for tight-margin 2.3V systems, while TPS3808G125DBVR lacks power-fail monitoring and requires additional components - making MAX6706AZKA+ the optimal choice for compact, feature-complete supervision of sub-2.5V rails.

Availability

MAX6706AZKA+ is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, white goods, and intelligent instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6706AZKA+ 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, automotive, and communications applications, with expertise in power management and reliability-critical supervision.

The MAX6701–MAX6708 family targets microprocessor-based systems needing robust, low-component-count power monitoring - specifically engineered for reliable reset generation, watchdog supervision, and power-fail warning in harsh thermal and electrical environments.

FAQ

What is the exact reset threshold voltage of MAX6706AZKA+ and how is it specified?

The MAX6706AZKA+ has a nominal reset threshold of 2.32V, with ±3% tolerance over the full operating temperature range of –40°C to +125°C. This value is guaranteed per the Z-suffix designation in the Threshold Suffix Guide and applies to the VCC input falling condition. The device uses a precision bandgap reference and achieves 60ppm/°C temperature coefficient, ensuring stable trip points in thermally variable applications like telecom equipment and industrial controllers.

Does MAX6706AZKA+ support active-high reset output, and how is it implemented?

Yes, MAX6706AZKA+ provides an active-high push-pull RESET output on pin 7. Unlike open-drain alternatives, this output actively drives high (≥0.8×VCC) when deasserted and low (≤0.4V) when asserted - eliminating external pull-up resistors. Its logic polarity is confirmed in the Pin Description table and functional diagram, and it remains valid down to VCC = 1V, enabling reliable reset signaling even during deep brownout.

How does the watchdog function in MAX6706AZKA+ differ from the standard MAX6706 version?

The MAX6706AZKA+ is the A-version: its WDO output deasserts immediately when VCC recovers above threshold, without waiting for a WDI edge. In contrast, the non-A MAX6706 requires a WDI transition to clear WDO after undervoltage. This makes MAX6706AZKA+ more responsive in transient-recovery scenarios, though both versions retain the same 1.6s watchdog timeout period and edge-triggered clearing on WDI toggles.

Can MAX6706AZKA+ monitor a secondary supply voltage, and what is the minimum detectable voltage?

Yes, MAX6706AZKA+ monitors secondary supplies via the PFI pin, which connects to an internal 0.62V comparator reference. Using an external resistor divider, any supply ≥0.62V can be scaled down to trip at this threshold - enabling detection of voltages as low as ~0.62V (e.g., 1.8V rail with 3:1 divider). PFO asserts low when PFI falls below 0.62V, providing a dedicated interrupt signal independent of the main reset function.

What package type and environmental compliance does MAX6706AZKA+ use?

MAX6706AZKA+ is supplied in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), measuring 2.9mm × 1.6mm × 1.1mm. The '+' suffix confirms lead-free, RoHS-compliant construction per Maxim's packaging standards. It operates across –40°C to +125°C and is qualified for industrial and extended-temperature applications, with guaranteed performance including reset validity down to VCC = 1V and 100ns glitch rejection on MR input.