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

Analog Devices Inc./Maxim Integrated MAX6709CUB

Name: MAX6709CUB
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6709CUB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6709CUB

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

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

Datasheet:: MAX6709CUB.pdf

Description:: IC SUPERVISOR QUAD VOLT MONITOR

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Product details

Overview

MAX6709CUB from Maxim Integrated is a low-power quad voltage monitor IC designed for multivoltage system supervision, featuring four independent open-drain power-good outputs with 10µA internal pullups to VCC, factory-trimmed thresholds for 5.0V (−10%), 3.3V (−10%), and 1.8V (−10%) supplies, ±2.0% threshold accuracy, and operation from 2.0V to 5.5V supply. It is used in desktop computers and telecom equipment to validate rail integrity before system boot.

For engineers reviewing the MAX6709CUB datasheet, MAX6709CUB pinout, MAX6709CUB application, or MAX6709CUB equivalent, this page delivers verified electrical parameters, µMAX package layout, real-world use scenarios in multivoltage systems, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The MAX6709CUB integrates four precision comparators with an internal 0.62V bandgap reference and factory-laser-trimmed resistor-divider networks to set nominal thresholds for IN1 = 5.0V, IN2 = 3.3V, IN3 = 1.8V, and IN4 = adjustable (via external divider). Each input has independent hysteresis (0.3 × V_TH) and operates over −40°C to +85°C.

It uses BiCMOS process technology (1029 transistors), consumes only 35µA typical supply current at 5V, and includes undervoltage lockout that forces all PWRGD_ outputs low when V_CC drops below 2.0V. All outputs are open-drain with weak internal pullups, enabling wire-ORed power-good signaling without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.0V to 5.5V - supports direct connection to monitored rails including 3.3V and 5V logic domains.
Supply Current (typ)	35µA at V_CC = 5V - enables always-on monitoring in battery-backed or low-power embedded systems.
Threshold Accuracy	±2.0% over temperature - ensures reliable power-good assertion across industrial temperature range.
Input Thresholds	IN1 = 4.50V (5.0V −10%), IN2 = 2.93V (3.3V −10%), IN3 = 1.58V (1.8V −10%), IN4 = adjustable down to 0.62V - matches common DC-DC output tolerances without external resistors.
Output Type	Four independent active-low open-drain outputs (PWRGD1–PWRGD4) with 10µA internal pullup to V_CC - simplifies interface to diverse logic families and enables wired-AND power-good bus.
Operating Temperature	−40°C to +85°C - qualified for industrial and computing environments with no derating required.
Propagation Delay	5µs (rising), 30µs (falling) - provides fast fault detection while avoiding false triggers from brief transients.

Pinout & Package

MAX6709CUB is housed in a 10-pin µMAX package (3mm × 3mm, 0.5mm pitch), RoHS-compliant, with exposed pad for thermal enhancement. Pin 5 is GND; Pin 10 is V_CC; Pins 1–4 are voltage inputs (IN1–IN4); Pins 6–9 are corresponding open-drain outputs (PWRGD4–PWRGD1).

Pin/Terminal	Circuit Role	Design Meaning
1	IN1	Monitored input for 5.0V rail (−10% threshold = 4.50V); high-impedance node requiring no external components.
2	IN2	Monitored input for 3.3V rail (−10% threshold = 2.93V); internally trimmed for precision without calibration.
3	IN3	Monitored input for 1.8V rail (−10% threshold = 1.58V); optimized for modern low-voltage core supplies.
4	IN4	Adjustable input referenced to 0.62V internal threshold; requires external resistor divider to set custom trip point.
5	GND	Analog/digital ground reference; must be connected to system ground plane for accurate threshold tracking.
6	PWRGD4	Open-drain output asserting low when IN4 falls below its threshold; 10µA internal pullup allows direct logic interfacing.
7	PWRGD3	Open-drain output asserting low when IN3 falls below 1.58V; electrically isolated from other outputs for independent status reporting.
8	PWRGD2	Open-drain output asserting low when IN2 falls below 2.93V; compatible with 3.3V or 5V logic pullup voltages.
9	PWRGD1	Open-drain output asserting low when IN1 falls below 4.50V; supports reset sequencing in multi-rail power-up sequences.
10	V_CC	Power supply input (2.0V–5.5V); powers internal circuitry and serves as pullup source for all PWRGD_ outputs.

Key Features

Feature	Design Value
Quad independent monitoring	Four separate comparator channels enable concurrent validation of 5V, 3.3V, 1.8V, and one user-defined rail-eliminates need for multiple discrete supervisors.
Factory-trimmed thresholds	IN1/IN2/IN3 thresholds laser-trimmed to ±2.0% accuracy-removes external resistor selection and calibration effort.
Adjustable fourth input	IN4 accepts external resistor divider to monitor any voltage ≥0.62V-supports custom rails like 2.5V, 1.2V, or battery levels.
Low quiescent current	35µA typical ICC at 5V-enables continuous supervision in energy-constrained applications such as portable computing.
Integrated hysteresis	0.3% of V_TH built-in hysteresis prevents chatter during slow-moving or noisy supply transitions-no external feedback required.
Wire-OR compatible outputs	All PWRGD_ outputs are open-drain with 10µA internal pullup-allows simple OR-ing into a single system power-good signal without external diodes or logic.

Applications

Desktop Computer Power Sequencing	Telecom Line Card Supervision
Use Scenario: Verifying stable 5V, 3.3V, 1.8V, and auxiliary 2.5V rails before releasing CPU reset in a dual-core motherboard. IC Role / Device Role / Timing Role: Quad voltage monitor providing independent PWRGD signals per rail to enable phased power-up and fault isolation. Use Value: Prevents boot failure by ensuring all critical supplies meet tolerance before firmware execution begins.	Use Scenario: Monitoring primary 5V, backup 3.3V, FPGA core 1.8V, and PoE-derived 12V (via divider) on a carrier-grade line card. IC Role / Device Role / Timing Role: Centralized rail health monitor feeding status to FPGA-based management controller via wired-AND bus. Use Value: Enables rapid identification of failed DC-DC converter without software polling-reduces mean time to repair.
High-End Printer Mainboard	Industrial Data Storage Controller
Use Scenario: Validating 5V logic, 3.3V interface, 1.8V memory, and adjustable 2.8V motor driver supply in a multifunction printer mainboard. IC Role / Device Role / Timing Role: Supervisor IC generating individual fault flags for each subsystem, routed to microcontroller GPIOs. Use Value: Allows differentiated error reporting (e.g., "paper jam" vs. "power rail fault") in field service diagnostics.	Use Scenario: Ensuring clean startup of SAS controller's 5V, 3.3V, 1.8V, and adjustable 1.5V I/O supply before initializing PCIe link. IC Role / Device Role / Timing Role: Pre-boot hardware monitor preventing link training until all rails settle within spec. Use Value: Eliminates PCIe enumeration failures caused by marginal supply conditions during cold start.

Desktop Computer Power Sequencing

Telecom Line Card Supervision

Use Scenario: Verifying stable 5V, 3.3V, 1.8V, and auxiliary 2.5V rails before releasing CPU reset in a dual-core motherboard.

IC Role / Device Role / Timing Role: Quad voltage monitor providing independent PWRGD signals per rail to enable phased power-up and fault isolation.

Use Value: Prevents boot failure by ensuring all critical supplies meet tolerance before firmware execution begins.

Use Scenario: Monitoring primary 5V, backup 3.3V, FPGA core 1.8V, and PoE-derived 12V (via divider) on a carrier-grade line card.

IC Role / Device Role / Timing Role: Centralized rail health monitor feeding status to FPGA-based management controller via wired-AND bus.

Use Value: Enables rapid identification of failed DC-DC converter without software polling-reduces mean time to repair.

High-End Printer Mainboard

Industrial Data Storage Controller

Use Scenario: Validating 5V logic, 3.3V interface, 1.8V memory, and adjustable 2.8V motor driver supply in a multifunction printer mainboard.

IC Role / Device Role / Timing Role: Supervisor IC generating individual fault flags for each subsystem, routed to microcontroller GPIOs.

Use Value: Allows differentiated error reporting (e.g., "paper jam" vs. "power rail fault") in field service diagnostics.

Use Scenario: Ensuring clean startup of SAS controller's 5V, 3.3V, 1.8V, and adjustable 1.5V I/O supply before initializing PCIe link.

IC Role / Device Role / Timing Role: Pre-boot hardware monitor preventing link training until all rails settle within spec.

Use Value: Eliminates PCIe enumeration failures caused by marginal supply conditions during cold start.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6710CUB	Same pinout and package; differs only in threshold tolerance (5% instead of 10% on IN1/IN2/IN3); identical 35µA ICC and µMAX footprint.	Used where tighter supply regulation is enforced (e.g., server VRMs with ±3% tolerance), requiring earlier fault detection.	Select MAX6710CUB if system rails are guaranteed ≤±5% and early warning margin is prioritized over cost.
TPS3307-33D	Triple-monitor (not quad); offers 3.3V, 5.0V, and adjustable inputs; higher ICC (60µA); SOIC-8 package-not pin-compatible.	Suitable for space-constrained designs needing only three rails monitored; lacks IN3 = 1.8V fixed option and µMAX size.	Choose TPS3307-33D only when fourth rail monitoring is unnecessary and SOIC-8 layout already exists.

Compared with MAX6710CUB and TPS3307-33D, the MAX6709CUB uniquely delivers four factory-set thresholds-including dedicated 1.8V support-in the smallest 10-pin µMAX package with lowest quiescent current, making it optimal for compact multivoltage systems requiring full rail visibility.

Availability

MAX6709CUB is available at Aetrix Electronics and suitable for desktop computers, telecommunications equipment, and high-end printers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6709CUB 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 semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and interface applications.

The MAX6709CUB belongs to Maxim's voltage supervisor product line, engineered specifically for reliable, low-power, multirail power sequencing and fault detection in computing and communications infrastructure.

FAQ

What is the exact threshold voltage for IN3 on the MAX6709CUB?

The MAX6709CUB specifies IN3 as a 1.8V nominal input with −10% tolerance, resulting in a precise trip threshold of 1.58V (typical) over −40°C to +85°C. This value is factory-laser-trimmed and guaranteed by design, not calculated. The MAX6709CUB datasheet confirms V_TH = 1.53V (min) to 1.62V (max) at TA = +25°C, with ±2.0% accuracy maintained across temperature.

Does the MAX6709CUB require external pullup resistors on its PWRGD outputs?

No, the MAX6709CUB includes 10µA internal pullup current sources to V_CC on all four PWRGD outputs, eliminating the need for external pullups in most 3.3V or 5V logic interfaces. External pullups are only required when interfacing to logic supplies outside the 2.0V–5.5V range or when stronger drive capability is needed-internal circuitry prevents reverse current flow from external pullups to V_CC.

Can the MAX6709CUB monitor a 2.5V supply?

Yes-the MAX6709CUB's IN4 input is adjustable and referenced to an internal 0.62V threshold. By connecting a resistor divider (e.g., R1 = 30.1kΩ, R2 = 10.0kΩ) between the 2.5V rail and GND, with the divider midpoint fed to IN4, the device monitors 2.5V with ±2.0% accuracy. The formula V_INTH = 0.62V × (R1 + R2)/R2 applies, and the MAX6709CUB datasheet provides full design guidance.

What is the supply current consumption of the MAX6709CUB at 3.0V V_CC?

The MAX6709CUB draws 25µA (typical) supply current at V_CC = 3.0V, as specified in the Electrical Characteristics table. This value is measured across −40°C to +85°C and reflects the device's ultra-low-power architecture-critical for always-on supervision in battery-buffered or energy-sensitive systems where the MAX6709CUB is deployed.

Is the MAX6709CUB pin-compatible with other devices in the MAX6709 family?

Yes-all MAX6709 variants (e.g., MAX6709AUB, MAX6709BUB, MAX6709CUB) share identical 10-pin µMAX packaging, pinout, and electrical interface. Only the factory-trimmed threshold voltages and tolerances differ between part numbers. This allows drop-in replacement during design iteration or qualification without PCB changes, provided the new thresholds match system requirements.

MAX6709CUB Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

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

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 4

Voltage - Threshold:: 1.58V, 2.93V, 4.38V, Adj

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-uMAX

MAX6709CUB FAQ

1.How can I place an order for MAX6709CUB through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6709CUB 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 MAX6709CUB reliable?

The price and inventory of MAX6709CUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6709CUB is usually 5 days.

3.What payment methods are accepted for MAX6709CUB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6709CUB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6709CUB?

MAX6709CUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6709CUB 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 MAX6709CUB?

For technical support, including MAX6709CUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6709CUB requirements.

6.How does Aetrix verify that MAX6709CUB is sourced from the original manufacturer or authorized distributors?

All MAX6709CUB 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 MAX6709CUB meets industry standards.

7.What is the process for return or replacement of MAX6709CUB?

All MAX6709CUB units undergo pre-shipment inspection (PSI). If there is an issue with MAX6709CUB, 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 MAX6709CUB part is unused and in its original packaging.

Return procedure for MAX6709CUB:

1.Submit a request within 90 days.

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

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