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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX6706ASKA+T

Name: MAX6706ASKA+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6706ASKA+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6706ASKA+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: SOT-23-8

Datasheet:: MAX6706ASKA+T.pdf

Description:: IC SUPERVISOR 2 CHANNEL SOT23-8

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Product details

Overview

MAX6706ASKA+T 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 V_CC = 1V, 140ms reset timeout delay, independent watchdog timer with 1.6s timeout, and adjustable 0.62V power-fail comparator input (PFI) with dedicated PFO output. It is used in white goods and telecommunications equipment for reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6706ASKA+T datasheet, MAX6706ASKA+T pinout, MAX6706ASKA+T application, or MAX6706ASKA+T equivalent, key selection criteria include its active-high reset output stage, SOT23-8 package compatibility, ±60 ppm/°C reset threshold temperature coefficient, and support for manual reset assertion via MR pin with 200ns delay.

Technical Context

The MAX6706ASKA+T implements a precision voltage-monitoring architecture with three independent comparators: one for V_CC (threshold set by 'S' suffix = 2.93V), one for PFI (0.62V internal reference), and one for MR (CMOS-compatible with 0.3×V_CC/0.7×V_CC logic thresholds). Its reset generator holds RESET high for 140–300ms after V_CC rises above threshold, while the watchdog circuit monitors WDI transitions and asserts WDO low on timeout or undervoltage.

Unlike non-A versions, the MAX6706A variant deasserts WDO immediately upon recovery from undervoltage without waiting for a WDI edge - a critical distinction for fail-safe NMI handling. The device operates across –40°C to +125°C and guarantees functional reset validity even as V_CC falls to 1V, enabling robust operation in wide-input industrial power rails.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Output Type	Active-high push-pull - drives high-impedance µP reset input directly without external pull-up
V_CC Reset Threshold	2.93V (typ), ±3% tolerance over –40°C to +125°C - matches +3.0V system rails with margin
Reset Timeout Delay	140ms (min) to 300ms (max) - ensures µP initialization completes before release
Watchdog Timeout	1.6s (typ), 0.96–2.52s over temperature - balances fault detection speed and noise immunity
PFI Threshold	0.62V (typ), 6mV hysteresis - enables precise early-warning power-fail detection via external divider
Supply Current	9–20µA at V_CC < 3.6V - supports battery-backed or ultra-low-power standby modes
Operating Voltage Range	1.2V to 5.5V - allows use with Li-ion, 3.3V, and 5V supplies without level-shifting

Pinout & Package

MAX6706ASKA+T 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 '+T' suffix).

Pin/Terminal	Circuit Role	Design Meaning
1 - MR	Active-low manual reset input	CMOS-compatible with internal 50kΩ pullup; 200ns response enables pushbutton debouncing
2 - V_CC	Main supply input	Power source for all comparators and outputs; valid down to 1.2V for brownout detection
3 - GND	Analog/digital ground reference	Common return for all internal circuits; must be low-impedance for accurate threshold sensing
4 - PFI	Power-fail monitor input	High-impedance (±200nA leakage) node tied to 0.62V internal reference - sets trip point via external resistor divider
5 - PFO	Power-fail output	Active-low push-pull output - signals impending supply collapse to µP interrupt line without external components
6 - WDI	Watchdog input	Edge-sensitive input; 50ns minimum pulse width detection enables low-overhead µP toggling
7 - RESET	Active-high reset output	Push-pull driver capable of sourcing 500µA at 0.8×V_CC; asserted high during power-up/brownout
8 - WDO	Watchdog output	Active-low push-pull output - independent of RESET, used for NMI or fault logging without resetting µP

Key Features

Feature	Design Value
Guaranteed reset validity to V_CC = 1V	Enables reliable reset assertion even during deep brownout or battery sag conditions
Independent PFI/PFO comparator	Allows early power-fail warning and orderly shutdown without affecting main reset timing
1.6s watchdog timeout with immediate WDO deassertion on recovery (A-version)	Prevents spurious NMI lockup during transient undervoltage events
140ms minimum reset timeout	Meets JEDEC JESD78 requirements for µP initialization time across temperature
Immunity to short falling V_CC transients	Rejects <100ns glitches, eliminating false resets from switching noise or ESD

Applications

Industrial Motor Control	Smart Energy Metering
Use Scenario: Monitoring 3.3V I/O rail and 2.5V core supply in motor drive inverters with isolated communication interfaces. IC Role / Device Role / Timing Role: Supervises primary V_CC and secondary supplies via PFI; asserts active-high RESET to hold MCU in reset until stable power is confirmed. Use Value: Prevents erratic gate-driver behavior during AC line sags by extending reset hold time beyond typical 100ms brownout windows.	Use Scenario: Detecting AC mains failure in DIN-rail energy meters to trigger backup SRAM save and LCD shutdown. IC Role / Device Role / Timing Role: Uses PFI input to sense rectified DC bus drop; PFO output triggers µP interrupt for last-gasp data storage before capacitor discharge. Use Value: Achieves >200ms warning window before V_CC collapse using 0.62V reference and 10:1 resistive divider - sufficient for EEPROM write completion.
Telecom Line Card	White Goods Mainboard
Use Scenario: Ensuring clean boot of DSP-based line interface units powered from multiple DC-DC converters. IC Role / Device Role / Timing Role: Monitors +3.3V management rail; WDO feeds NMI input to log watchdog timeouts independently of system reset. Use Value: Enables field diagnostics by distinguishing between software hangs (WDO asserted) and power faults (RESET asserted).	Use Scenario: Power supervision in refrigerator control boards with variable-speed compressor drivers and display modules. IC Role / Device Role / Timing Role: Active-high RESET synchronizes MCU startup with 5V display backlight enable; MR pin accepts door-switch signal for forced reset on lid open. Use Value: Eliminates need for discrete RC reset circuit and external pull-up, reducing BOM count by two passive components.

Industrial Motor Control

Smart Energy Metering

Use Scenario: Monitoring 3.3V I/O rail and 2.5V core supply in motor drive inverters with isolated communication interfaces.

IC Role / Device Role / Timing Role: Supervises primary V_CC and secondary supplies via PFI; asserts active-high RESET to hold MCU in reset until stable power is confirmed.

Use Value: Prevents erratic gate-driver behavior during AC line sags by extending reset hold time beyond typical 100ms brownout windows.

Use Scenario: Detecting AC mains failure in DIN-rail energy meters to trigger backup SRAM save and LCD shutdown.

IC Role / Device Role / Timing Role: Uses PFI input to sense rectified DC bus drop; PFO output triggers µP interrupt for last-gasp data storage before capacitor discharge.

Use Value: Achieves >200ms warning window before V_CC collapse using 0.62V reference and 10:1 resistive divider - sufficient for EEPROM write completion.

Telecom Line Card

White Goods Mainboard

Use Scenario: Ensuring clean boot of DSP-based line interface units powered from multiple DC-DC converters.

IC Role / Device Role / Timing Role: Monitors +3.3V management rail; WDO feeds NMI input to log watchdog timeouts independently of system reset.

Use Value: Enables field diagnostics by distinguishing between software hangs (WDO asserted) and power faults (RESET asserted).

Use Scenario: Power supervision in refrigerator control boards with variable-speed compressor drivers and display modules.

IC Role / Device Role / Timing Role: Active-high RESET synchronizes MCU startup with 5V display backlight enable; MR pin accepts door-switch signal for forced reset on lid open.

Use Value: Eliminates need for discrete RC reset circuit and external pull-up, reducing BOM count by two passive components.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6706MTA+T	Reset threshold = 4.38V (M-suffix); same pinout, timing, and features	Designed for +5V systems instead of +3.0V; incompatible with 3.3V/3.0V rails	Select only if V_CC nominal is ≥4.25V and brownout margin requires higher trip point
TPS3808G33DBVR	Fixed 3.3V threshold, no PFI/PFO, no WDI/WDO; SOT23-6 package	Lacks power-fail warning and independent watchdog output - suitable only for basic reset-only use cases	Choose when cost sensitivity outweighs need for PFI-driven shutdown or NMI-based fault logging

Compared with MAX6706MTA+T and TPS3808G33DBVR, the MAX6706ASKA+T uniquely combines +3.0V-compatible reset threshold, active-high push-pull output, and full PFI/PFO + WDI/WDO functionality in SOT23-8 - making it optimal for space-constrained, multi-function supervision in 3.3V/3.0V industrial systems.

Availability

MAX6706ASKA+T is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, telecom line cards, and white goods mainboards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6706ASKA+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 industrial, automotive, and communications applications, with emphasis on reliability and integration.

The MAX6701–MAX6708 family was engineered specifically for microprocessor power supervision in harsh environments, delivering combined reset, watchdog, and power-fail functions in minimal footprint SOT23 packages.

FAQ

What is the exact reset threshold voltage for MAX6706ASKA+T?

The MAX6706ASKA+T has a nominal V_CC reset threshold of 2.93V (typical), with ±3% tolerance over –40°C to +125°C. This corresponds to the 'S' suffix in the part number and is optimized for +3.0V supply monitoring. The threshold exhibits a temperature coefficient of 60ppm/°C, ensuring stability across industrial temperature ranges.

Does MAX6706ASKA+T support active-high reset output?

Yes, the MAX6706ASKA+T features an active-high push-pull RESET output - confirmed by its '6' position in the MAX670x series designation and verified in the Pin Description table (pin 7). This eliminates the need for external pull-up resistors and directly interfaces with µP reset inputs requiring high-active assertion.

How does the watchdog behavior differ between MAX6706ASKA+T and non-A versions?

The MAX6706ASKA+T (A-version) deasserts WDO immediately when V_CC recovers from undervoltage, whereas non-A versions require a WDI edge to clear WDO. This prevents NMI lockup during brief brownouts and simplifies firmware design - a documented behavioral difference in the Standard- vs. A-Version Comparison section.

Can MAX6706ASKA+T monitor voltages other than V_CC?

Yes, the MAX6706ASKA+T includes a dedicated PFI input with 0.62V internal reference, enabling monitoring of any system voltage (e.g., 5V, 12V, or battery) via an external resistor divider. The PFO output provides an active-low signal when the monitored voltage drops below the calculated threshold - a capability explicitly supported in the Applications Information section.

What is the function of the MR pin on MAX6706ASKA+T?

The MR (Manual Reset) pin on MAX6706ASKA+T is an active-low CMOS input with internal 50kΩ pullup. Pulling MR low forces an immediate active-high RESET assertion for ≥200ns, then holds RESET high for the full 140–300ms timeout period. It supports pushbutton reset and can be driven by external logic, as specified in the Electrical Characteristics table under MR Input Voltage and MR Minimum Input Pulse.

MAX6706ASKA+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: SOT-23-8

Packaging:: Bulk

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 2

Voltage - Threshold:: 2.93V, Adj

Output:: Push-Pull, Totem Pole

Reset:: Active High

Reset Timeout:: 140ms Minimum

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-8

MAX6706ASKA+T FAQ

1.How can I place an order for MAX6706ASKA+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6706ASKA+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MAX6706ASKA+T reliable?

The price and inventory of MAX6706ASKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706ASKA+T is usually 5 days.

3.What payment methods are accepted for MAX6706ASKA+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706ASKA+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6706ASKA+T?

MAX6706ASKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6706ASKA+T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MAX6706ASKA+T?

For technical support, including MAX6706ASKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706ASKA+T requirements.

6.How does Aetrix verify that MAX6706ASKA+T is sourced from the original manufacturer or authorized distributors?

All MAX6706ASKA+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6706ASKA+T meets industry standards.

7.What is the process for return or replacement of MAX6706ASKA+T?

All MAX6706ASKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706ASKA+T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MAX6706ASKA+T part is unused and in its original packaging.

Return procedure for MAX6706ASKA+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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