Analog Devices Inc./Maxim Integrated MAX6706RKA

Overview

MAX6706RKA from Maxim Integrated is an active-high push-pull microprocessor supervisory IC in 8-pin SOT23 package, monitoring single-supply voltage with 140ms reset timeout, 1.6s watchdog timer, and independent 0.62V power-fail comparator (PFI/PFO). It asserts RESET high during brownout or power-down and supports manual reset via MR pin for embedded controllers requiring deterministic startup and fault recovery.

For engineers reviewing the MAX6706RKA datasheet, MAX6706RKA pinout, MAX6706RKA application, or MAX6706RKA equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, real-world supervision use cases, and validated alternative options for industrial control, automotive ECUs, and network edge devices.

Technical Context

The MAX6706RKA implements a dual-comparator architecture: one fixed-threshold VCC monitor and one externally adjustable PFI input referenced to an internal 0.62V bandgap. Its watchdog timer resets on WDI edge transitions and latches WDO low on timeout or undervoltage - deasserting only on valid WDI toggle or MR pull-low per A-version behavior.

Reset generation uses a precision voltage reference with 60ppm/°C drift and guaranteed validity down to VCC = 1V. The active-high push-pull RESET output drives logic directly without external pull-up, while PFO provides open-drain power-fail warning with 1µs propagation delay and 6mV hysteresis.

Key Specifications

Pinout & Package

Package: 8-pin SOT23-8, 2.9mm × 1.6mm footprint, surface-mount, lead-free compatible (RoHS compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6706AKA-T, MAX6706RKA provides latched WDO for persistent fault reporting, while TPS3808G33DBVR omits PFI/PFO and WDO entirely - making MAX6706RKA the only option supporting full triple-function supervision (reset, watchdog, power-fail) in a single 8-pin SOT23 device.

Availability

MAX6706RKA is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and network infrastructure applications requiring stable component supply, extended temperature operation (-40°C to +125°C), and long-term lifecycle support.

Supply support for MAX6706RKA 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 demanding industrial, automotive, and communications applications.

The MAX6701–MAX6708 family delivers compact, low-power microprocessor supervision with integrated watchdog, power-fail detection, and manual reset - targeting space-constrained embedded systems needing high reliability under voltage stress.

FAQ

What is the reset threshold voltage for MAX6706RKA?

The MAX6706RKA has a factory-trimmed VCC reset threshold of 3.08V (R-suffix), specified over -40°C to +125°C with ±3% tolerance. This value is optimized for reliable supervision of +3.3V supplies and is guaranteed by production test, not design simulation. The threshold is referenced to an internal bandgap and exhibits 60ppm/°C temperature coefficient. MAX6706RKA maintains reset assertion integrity down to VCC = 1V, ensuring robustness during deep brownout events.

Does MAX6706RKA support active-high reset output?

Yes, MAX6706RKA provides an active-high push-pull RESET output on pin 7, eliminating the need for an external pull-up resistor. This output drives high during reset conditions (e.g., VCC below 3.08V, MR pulled low, or watchdog timeout) and remains high for the full 140ms timeout period after fault clearance. The push-pull structure sources up to 800µA at VCC ≥ 4.75V and sinks 1.2mA at VCC ≥ 2.55V, enabling direct interface with CMOS inputs. MAX6706RKA's active-high RESET simplifies design versus open-drain alternatives requiring external biasing.

How does the watchdog function work in MAX6706RKA?

The MAX6706RKA watchdog timer requires a WDI edge transition every 1.6s (typical) to remain cleared. If no edge occurs, WDO (pin 8) asserts low and remains latched until cleared by either a valid WDI toggle or pulling MR low. Unlike non-A versions, MAX6706RKA's WDO does not auto-clear on VCC recovery - it stays asserted to signal persistent fault. The timer resets automatically on any VCC, RST_IN1, or RST_IN2 undervoltage event. MAX6706RKA's watchdog operates independently of the reset generator, allowing separate fault reporting without resetting the µP.

Can MAX6706RKA monitor voltages other than VCC?

Yes, MAX6706RKA includes a dedicated PFI (pin 4) input referenced to an internal 0.62V comparator, enabling supervision of secondary rails like 5V, 2.5V, or 1.8V supplies. By connecting PFI to an external resistive divider, users set custom trip points - e.g., a 10kΩ/20kΩ divider on a 5V rail yields ~3.33V trip. PFO (pin 5) asserts low when PFI falls below 0.62V, providing early warning before VCC dropout. MAX6706RKA's PFI/PFO pair supports independent power-fail detection without affecting primary reset timing or requiring additional ICs.

What package and temperature range does MAX6706RKA use?

MAX6706RKA is housed in an 8-pin SOT23-8 package (2.9mm × 1.6mm) with RoHS-compliant lead-free finish. It is rated for operation from -40°C to +125°C, meeting automotive and industrial temperature requirements. The SOT23-8 footprint is compatible with standard reflow profiles and allows high-density placement on compact PCBs. MAX6706RKA's thermal performance supports 714mW continuous dissipation at +70°C, derating linearly above that temperature. This package and rating make MAX6706RKA suitable for under-hood automotive modules and factory-floor controllers.