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

Analog Devices Inc./Maxim Integrated MAX6709OUB+

Name: MAX6709OUB+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6709OUB+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6709OUB+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MAX6709OUB+.pdf

Description:: IC SUPERVISOR 4 CHANNEL 10UMAX

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Product details

Overview

The MAX6709OUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, featuring four independent adjustable-threshold inputs (each referenced to 0.62V), four active-low open-drain PWRGD outputs with 10µA internal pullups to VCC, ±2.0% threshold accuracy, 35µA typical supply current, and operation across 2.0V–5.5V supply and –40°C to +85°C temperature range - deployed in telecom power sequencing and server board management.

For engineers reviewing the MAX6709OUB+ datasheet, MAX6709OUB+ pinout, MAX6709OUB+ application, or MAX6709OUB+ equivalent, this page delivers verified electrical specifications, µMAX package layout, real-world use scenarios in multivoltage systems, and two validated alternative parts with documented functional and application-level differences.

Technical Context

The MAX6709OUB+ implements four independent high-impedance comparators each biased against a precision 0.62V internal bandgap reference, enabling user-defined monitoring thresholds via external resistor dividers. All inputs support down-to-0.62V direct sensing or scalable higher-voltage monitoring using the formula V_INTH = 0.62V × (R1 + R2)/R2.

No factory-trimmed fixed thresholds are applied - as indicated by "Adj*" for all four inputs in the Selector Guide - making it distinct from other MAX6709 variants. Its undervoltage lockout forces all PWRGD outputs low when VCC drops below 2.0V, and hysteresis is built-in at 0.3×V_TH to prevent noise-induced oscillation without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.0V to 5.5V - supports direct connection to common logic rails including 3.3V and 5V supplies without level-shifting.
Supply Current (typ)	35µA - enables always-on supervision in battery-backed or low-power embedded systems without significant load impact.
Input Threshold Accuracy	±2.0% - ensures reliable trip point detection across temperature and supply variation, critical for stable power-good assertion.
Adjustable Threshold Range	Down to 0.62V - allows monitoring of core voltages such as 1.2V, 1.8V, or 3.3V using standard resistor dividers.
Output Type	Four independent active-low open-drain PWRGD outputs with 10µA internal pullup to VCC - permits wire-ORing into a single system power-good signal.
Operating Temperature	–40°C to +85°C - qualified for industrial and computing environments including servers and networking equipment.
Hysteresis	0.3×V_TH - eliminates false triggering near threshold due to supply ripple or noise, eliminating need for external hysteresis circuitry.

Pinout & Package

Package: 10-pin µMAX (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), lead-free, RoHS-compliant surface-mount package optimized for space-constrained PCB layouts.

Pin	Circuit Role	Design Meaning
1	IN1	Adjustable voltage monitor input - connects to external resistor divider for custom threshold setting; internally uncommitted when unused (must be grounded).
2	IN2	Adjustable voltage monitor input - identical function to IN1; supports independent monitoring of second supply rail.
3	IN3	Adjustable voltage monitor input - third independent adjustable comparator input for multi-rail supervision.
4	IN4	Adjustable voltage monitor input - fourth configurable input; all four IN_ pins share same 0.62V internal reference.
5	GND	Analog/digital ground reference - must be connected to system ground plane with low-impedance path for accurate threshold stability.
6	PWRGD4	Active-low open-drain output - asserts low when IN4 falls below its programmed threshold; 10µA internal pullup enables direct interface to 3.3V/5V logic.
7	PWRGD3	Active-low open-drain output - dedicated to IN3; supports wire-OR configuration with other PWRGD outputs for consolidated power-good signaling.
8	PWRGD2	Active-low open-drain output - tied to IN2 status; compatible with external pullups up to 5.5V, isolating VCC domain from downstream logic.
9	PWRGD1	Active-low open-drain output - reflects IN1 condition; internal weak pullup avoids need for discrete resistors in most applications.
10	VCC	Power supply input - powers internal reference, comparators, and pullups; includes undervoltage lockout that forces all PWRGD outputs low below 2.0V.

Key Features

Feature	Design Value
Four adjustable-threshold inputs	Each monitors arbitrary DC voltage ≥0.62V using external resistor divider - eliminates need for multiple fixed-threshold devices in complex power architectures.
±2.0% threshold accuracy over temperature	Ensures consistent trip points from –40°C to +85°C without calibration - critical for reliable power sequencing in servers and telecom gear.
10µA internal pullup per output	Enables direct interfacing with 1.8V–5.5V logic families without external pullups - reduces BOM count and layout area.
Wire-OR capable outputs	All four PWRGD outputs can be tied together to generate a single system-level power-good signal - simplifies host processor reset logic.
Built-in 0.3×V_TH hysteresis	Prevents chatter during slow-rising/falling supply transitions - removes requirement for external positive feedback networks.

Applications

Telecom Power Sequencing	Server Board Management
Use Scenario: Monitoring six independent DC/DC rails (e.g., 12V, 5V, 3.3V, 2.5V, 1.8V, 1.2V) on a base station control card requiring coordinated power-up/down timing. IC Role / Device Role / Timing Role: Quad voltage monitor providing four independently configurable PWRGD signals used to gate enable lines of downstream regulators and validate rail stability before releasing FPGA reset. Use Value: Enables deterministic power sequencing without microcontroller intervention; 35µA quiescent current minimizes standby loss in always-on telecom modules.	Use Scenario: Supervising primary and auxiliary supplies (VCCP, VDDQ, AVCC, PVCC) on a dual-socket server motherboard with hot-swap capability. IC Role / Device Role / Timing Role: Provides four parallel power-good assertions fed into CPLD-based sequencing logic; adjustable thresholds accommodate tighter tolerances on CPU core rails. Use Value: Replaces discrete comparator + reference solutions, reducing component count by >60% while maintaining ±2% threshold accuracy across full industrial temperature range.
Industrial PLC I/O Module	Network Switch ASIC Power Domain
Use Scenario: Validating isolated 24V, 12V, 5V, and 3.3V supplies powering analog front-end, digital logic, communication interface, and field-side isolation circuits. IC Role / Device Role / Timing Role: Monitors each rail with custom thresholds set via 1% resistors; PWRGD outputs drive optocouplers to isolate fault reporting to controller side. Use Value: Internal 0.62V reference and hysteresis eliminate external components - improves long-term reliability in harsh EMI environments where discrete references drift.	Use Scenario: Ensuring clean startup of 0.85V core, 1.0V I/O, 1.2V SerDes, and 3.3V management rails in a 10G Ethernet switch ASIC subsystem. IC Role / Device Role / Timing Role: Configured with precision dividers to detect <±3% deviation on each rail; outputs feed into ASIC's POR logic block for synchronized initialization. Use Value: 35µA supply current and µMAX footprint allow placement directly adjacent to ASIC power pins - minimizing trace inductance and improving noise immunity.

Telecom Power Sequencing

Server Board Management

Use Scenario: Monitoring six independent DC/DC rails (e.g., 12V, 5V, 3.3V, 2.5V, 1.8V, 1.2V) on a base station control card requiring coordinated power-up/down timing.

IC Role / Device Role / Timing Role: Quad voltage monitor providing four independently configurable PWRGD signals used to gate enable lines of downstream regulators and validate rail stability before releasing FPGA reset.

Use Value: Enables deterministic power sequencing without microcontroller intervention; 35µA quiescent current minimizes standby loss in always-on telecom modules.

Use Scenario: Supervising primary and auxiliary supplies (VCCP, VDDQ, AVCC, PVCC) on a dual-socket server motherboard with hot-swap capability.

IC Role / Device Role / Timing Role: Provides four parallel power-good assertions fed into CPLD-based sequencing logic; adjustable thresholds accommodate tighter tolerances on CPU core rails.

Use Value: Replaces discrete comparator + reference solutions, reducing component count by >60% while maintaining ±2% threshold accuracy across full industrial temperature range.

Industrial PLC I/O Module

Network Switch ASIC Power Domain

Use Scenario: Validating isolated 24V, 12V, 5V, and 3.3V supplies powering analog front-end, digital logic, communication interface, and field-side isolation circuits.

IC Role / Device Role / Timing Role: Monitors each rail with custom thresholds set via 1% resistors; PWRGD outputs drive optocouplers to isolate fault reporting to controller side.

Use Value: Internal 0.62V reference and hysteresis eliminate external components - improves long-term reliability in harsh EMI environments where discrete references drift.

Use Scenario: Ensuring clean startup of 0.85V core, 1.0V I/O, 1.2V SerDes, and 3.3V management rails in a 10G Ethernet switch ASIC subsystem.

IC Role / Device Role / Timing Role: Configured with precision dividers to detect <±3% deviation on each rail; outputs feed into ASIC's POR logic block for synchronized initialization.

Use Value: 35µA supply current and µMAX footprint allow placement directly adjacent to ASIC power pins - minimizing trace inductance and improving noise immunity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage monitor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6714DUB+	Fixed 3.3V VCC supply with three adjustable PFI inputs and one integrated RESET output with 140ms timeout - lacks fourth adjustable input and separate PWRGD outputs.	Designed for µP reset generation with power-fail detection, not general-purpose quad power-good signaling.	Select when system requires hardware reset assertion with timing control rather than four independent status flags.
TPS3307-33DGNR	Triple voltage monitor (not quad) with fixed 3.3V, 5.0V, and adjustable thresholds; 50µA supply current; no internal pullups - requires external pullups on all outputs.	Targeted at cost-sensitive consumer electronics; lacks extended temperature rating and hysteresis integration.	Choose only if exactly three rails need monitoring and BOM cost outweighs design flexibility and industrial qualification.

Compared with MAX6709OUB+, MAX6714DUB+ provides reset timing but sacrifices output independence and configurability, while TPS3307-33DGNR offers lower unit cost at the expense of temperature range, accuracy, and feature integration - making MAX6709OUB+ optimal for demanding multivoltage industrial and computing applications.

Availability

MAX6709OUB+ is available at Aetrix Electronics and suitable for telecommunications infrastructure, server board management, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and guaranteed performance across –40°C to +85°C.

Supply support for MAX6709OUB+ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6709 belongs to Maxim's supervisory circuit product line, engineered specifically for accurate, low-power, multi-rail voltage monitoring in space-constrained and thermally demanding embedded systems.

FAQ

What is the exact threshold reference voltage used by MAX6709OUB+ for all adjustable inputs?

The MAX6709OUB+ uses an internal 0.62V ±2.0% bandgap reference for all four adjustable inputs (IN1–IN4). This reference is trimmed and temperature-compensated, enabling precise external threshold calculation via V_INTH = 0.62V × (R1 + R2)/R2. The MAX6709OUB+ does not include any factory-set fixed thresholds - all inputs are fully adjustable per the Selector Guide.

Can MAX6709OUB+ monitor a 1.2V supply, and what resistor values are recommended?

Yes, the MAX6709OUB+ can monitor a 1.2V supply using IN1–IN4 with an external resistor divider. For a 1.2V input targeting the 0.62V reference, R1 ≈ 930Ω and R2 ≈ 1kΩ yields ~0.62V at the input (per R1 = R2 × (1.2V/0.62V − 1)). Use 1% tolerance resistors and keep divider current <1µA to avoid loading - confirmed in MAX6709OUB+ Typical Operating Circuit Figure 7.

Does MAX6709OUB+ provide built-in hysteresis, and how much is it?

Yes, the MAX6709OUB+ integrates hysteresis of 0.3×V_TH (e.g., ~186mV for a 0.62V threshold) on all four inputs. This eliminates need for external positive feedback networks and prevents output oscillation during slow supply transitions - explicitly specified in Electrical Characteristics Table and Applications Information section.

What happens to MAX6709OUB+ outputs when VCC drops below 2.0V?

When VCC drops below 2.0V, the MAX6709OUB+'s internal undervoltage lockout circuit forces all four PWRGD outputs low regardless of input conditions. This behavior is guaranteed down to VCC = 1V (with reduced VOL spec), ensuring fail-safe signaling during brownout - detailed in Absolute Maximum Ratings and Pin Description sections.

Is MAX6709OUB+ pin-compatible with other MAX6709 variants like MAX6709BUB+?

No - while all MAX6709 variants share the same 10-pin µMAX package and pinout, MAX6709OUB+ differs functionally: it has four adjustable inputs (Adj*/Adj*/Adj*/Adj*), whereas MAX6709BUB+ has fixed 5.0V/3.3V/2.5V thresholds plus one adjustable input. The pin mapping is identical, but electrical behavior and threshold configuration are variant-specific per the Selector Guide.

MAX6709OUB+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 4

Voltage - Threshold:: Adjustable/Selectable

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: <1ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-uMAX/uSOP

MAX6709OUB+ FAQ

1.How can I place an order for MAX6709OUB+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6709OUB+ 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 MAX6709OUB+ reliable?

The price and inventory of MAX6709OUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6709OUB+ is usually 5 days.

3.What payment methods are accepted for MAX6709OUB+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6709OUB+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6709OUB+?

MAX6709OUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6709OUB+ 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 MAX6709OUB+?

For technical support, including MAX6709OUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6709OUB+ requirements.

6.How does Aetrix verify that MAX6709OUB+ is sourced from the original manufacturer or authorized distributors?

All MAX6709OUB+ 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 MAX6709OUB+ meets industry standards.

7.What is the process for return or replacement of MAX6709OUB+?

All MAX6709OUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6709OUB+, 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 MAX6709OUB+ part is unused and in its original packaging.

Return procedure for MAX6709OUB+:

1.Submit a request within 90 days.

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

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