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

Analog Devices Inc./Maxim Integrated MAX6443US46L+T

Name: MAX6443US46L+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6443US46L+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6443US46L+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: TO-253-4, TO-253AA

Datasheet:: MAX6443US46L+T.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT143-4

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Product details

Overview

The MAX6443US46L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with extended manual reset setup period (6.72s), 4.625V V_CC reset threshold, and push-pull active-low RESET output. It monitors a single supply voltage, asserts reset during brownout or power-down, and delivers a guaranteed 210ms typical timeout pulse after recovery - ideal for set-top boxes and industrial equipment requiring nuisance-reset immunity.

For engineers reviewing the MAX6443US46L+T datasheet, MAX6443US46L+T pinout, MAX6443US46L+T application, or MAX6443US46L+T equivalent, key selection criteria include its 4.625V precision reset threshold, 6.72s manual reset hold time, SOT143-4 package, -40°C to +85°C operation, and push-pull output logic - all critical for reliable system initialization in consumer and industrial embedded designs.

Technical Context

This device implements a precision bandgap-based voltage monitor with 60ppm/°C tempco and 2×V_TH hysteresis to prevent chatter near threshold. Its internal timing circuitry guarantees valid reset assertion down to V_CC = 1.0V and enforces a fixed 6.72s minimum low-time on MR1 before generating a one-shot 210ms (typ) RESET pulse.

The MAX6443US46L+T uses a dedicated MR1 input with internal 50kΩ pullup to V_CC, no RSTIN or MR2 pins, and operates exclusively in push-pull mode - distinguishing it from dual-input or adjustable-threshold variants in the MAX6443–MAX6452 family.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Reset Threshold	4.625V ±0.125V - precisely triggers reset when main supply drops below nominal 4.6V rail, ensuring clean processor restart before undervoltage lockout.
Manual Reset Setup Period (t_MR)	6.72s (typ) - requires sustained MR1 low for >6.7 seconds to avoid false resets from button bounce or transient closures.
Reset Timeout Period (t_RP)	210ms (typ), 140ms (min) - holds RESET low long enough to guarantee full µP initialization across all operating conditions.
V_CC Operating Range	1.0V to 5.5V - maintains functional reset logic even as supply decays to 1.0V, enabling valid reset assertion during deep brownout.
Supply Current (I_CC)	6µA (typ) at 3.6V - ultra-low quiescent current extends battery life in always-on consumer electronics.
Output Type	Active-low push-pull - drives RESET directly without external pullup, simplifying PCB layout and reducing component count.
Operating Temperature	-40°C to +85°C - fully specified for industrial and automotive cabin environments without derating.

Pinout & Package

Package: 4-pin SOT143 (U4+1), surface-mount, 1.3mm × 2.1mm footprint, lead(Pb)-free.

Pin/Terminal	Circuit Role	Design Meaning
1 - GND	Ground reference	Primary return path for internal comparators and output driver; must be connected to system ground plane for noise immunity.
2 - V_CC	Supply input & monitored rail	Powers the IC and serves as the sole voltage monitored for reset generation; accepts 1.0V–5.5V with guaranteed operation down to 1.0V.
3 - MR1	Manual reset input (active-low)	Internal 50kΩ pullup to V_CC; requires ≥6.72s low assertion to trigger one-shot reset; debounced internally - no external RC needed.
4 - RESET	Active-low push-pull output	Drives µP reset pin directly; sinks 50µA at 0.3V max when asserted; sources 200µA at 0.8×V_CC when deasserted.

Key Features

Feature	Design Value
Extended manual reset setup	6.72s hold time prevents accidental resets from front-panel switches - eliminates need for mechanical debounce hardware.
Precision factory-set threshold	4.625V ±0.125V with 60ppm/°C tempco ensures accurate reset point across temperature without calibration.
Valid reset down to V_CC = 1.0V	Guarantees RESET remains logically correct even as supply collapses, preventing undefined µP states during brownout recovery.
Low 6µA supply current	Enables use in battery-backed systems where standby current budget is sub-10µA - e.g., remote controls or smart sensors.
Push-pull output logic	Eliminates external pullup resistor, reduces BOM cost and board area, and improves rise/fall time control vs. open-drain alternatives.

Applications

Set-Top Box Power Management	DVD Player System Recovery
Use Scenario: Front-panel power button initiates cold boot or recovery after firmware hang. IC Role / Device Role / Timing Role: Monitors 4.6V main supply and converts long button press (>6.72s) into clean 210ms reset pulse to µP. Use Value: Prevents nuisance resets from brief button taps while ensuring deterministic hard reset when required.	Use Scenario: System fails to respond after disc insertion or menu navigation error. IC Role / Device Role / Timing Role: Provides precise 4.625V brownout detection and generates timed reset pulse to force full controller reinitialization. Use Value: Guarantees reset assertion even if V_CC sags to 1.0V, eliminating partial initialization failures.
Industrial HMI Panel Reset	Cable Modem Firmware Recovery
Use Scenario: Field technician performs controlled reboot via service button without powering down entire enclosure. IC Role / Device Role / Timing Role: Acts as dedicated reset sequencer with extended MR1 hold time to distinguish service reset from accidental presses. Use Value: Enables safe, repeatable field recovery without exposing user to risk of unintended system interruption.	Use Scenario: Modem enters unresponsive state after firmware update or network outage. IC Role / Device Role / Timing Role: Supervises 4.6V auxiliary supply and delivers 210ms reset pulse only after full voltage recovery, avoiding premature restart. Use Value: Ensures µP completes full boot sequence by enforcing minimum reset duration independent of supply ramp rate.

Set-Top Box Power Management

DVD Player System Recovery

Use Scenario: Front-panel power button initiates cold boot or recovery after firmware hang.

IC Role / Device Role / Timing Role: Monitors 4.6V main supply and converts long button press (>6.72s) into clean 210ms reset pulse to µP.

Use Value: Prevents nuisance resets from brief button taps while ensuring deterministic hard reset when required.

Use Scenario: System fails to respond after disc insertion or menu navigation error.

IC Role / Device Role / Timing Role: Provides precise 4.625V brownout detection and generates timed reset pulse to force full controller reinitialization.

Use Value: Guarantees reset assertion even if V_CC sags to 1.0V, eliminating partial initialization failures.

Industrial HMI Panel Reset

Cable Modem Firmware Recovery

Use Scenario: Field technician performs controlled reboot via service button without powering down entire enclosure.

IC Role / Device Role / Timing Role: Acts as dedicated reset sequencer with extended MR1 hold time to distinguish service reset from accidental presses.

Use Value: Enables safe, repeatable field recovery without exposing user to risk of unintended system interruption.

Use Scenario: Modem enters unresponsive state after firmware update or network outage.

IC Role / Device Role / Timing Role: Supervises 4.6V auxiliary supply and delivers 210ms reset pulse only after full voltage recovery, avoiding premature restart.

Use Value: Ensures µP completes full boot sequence by enforcing minimum reset duration independent of supply ramp rate.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6444US46L+T	Same 4.625V threshold and 6.72s MR1 setup, but open-drain RESET output.	Requires external pullup resistor; suitable when interfacing to mixed-voltage logic or level-shifting is needed.	Select when system design mandates open-drain flexibility or shares RESET bus with other devices.
MAX6443US44L+T	Identical SOT143-4 package and timing, but 4.375V reset threshold.	Designed for 4.3V nominal rails (e.g., some LDO outputs); not interchangeable without verifying supply tolerance margin.	Choose only if target supply voltage is closer to 4.3V than 4.6V - verify V_TH margin against actual V_CC variation.

Compared with MAX6444US46L+T, the MAX6443US46L+T eliminates external pullup components and offers faster RESET rise time; compared with MAX6443US44L+T, it provides tighter alignment with 4.6V systems, improving noise margin against false resets during supply ripple.

Availability

MAX6443US46L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and industrial HMIs requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.

Supply support for MAX6443US46L+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 power, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6443–MAX6452 family delivers robust, low-power µP supervision with extended manual reset timing - engineered specifically for consumer electronics and industrial equipment where front-panel reliability and brownout immunity are critical.

FAQ

What is the exact reset threshold voltage for MAX6443US46L+T?

The MAX6443US46L+T has a factory-trimmed V_CC reset threshold of 4.625V, with a guaranteed range of 4.50V to 4.75V over temperature and process variation. This value is fixed and non-adjustable, matching the "46" suffix in the part number per Maxim's ordering guide.

Does MAX6443US46L+T support dual manual reset inputs?

No. The MAX6443US46L+T is a single-manual-reset variant with only MR1 - it does not include MR2 or RSTIN pins. Dual-input functionality is exclusive to MAX6445–MAX6446 and MAX6449–MAX6452 variants, as confirmed in the Pin Description and Selector Guide sections of the datasheet.

What package type and pin count does MAX6443US46L+T use?

The MAX6443US46L+T uses a 4-pin SOT143 package (package code U4+1), with pinout: 1=GND, 2=V_CC, 3=MR1, 4=RESET. This matches the "US" prefix in the part number and is explicitly listed in the Ordering Information table on page 10 of the datasheet.

Can MAX6443US46L+T monitor an external voltage like a 1.8V rail?

No. The MAX6443US46L+T monitors only the V_CC supply pin - it lacks the RSTIN input required for external voltage monitoring. For adjustable-threshold supervision of secondary rails, consider MAX6449–MAX6452 variants, which include the RSTIN pin and 0.63V internal reference.

What is the minimum V_CC required for MAX6443US46L+T to assert a valid RESET?

The MAX6443US46L+T guarantees valid RESET logic down to V_CC = 1.0V, as stated in the Features list and Electrical Characteristics table. Below 1.0V, RESET output behavior is not specified - for operation down to 0V, a pulldown resistor is required (see Applications Information section).

MAX6443US46L+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: TO-253-4, TO-253AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.625V

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: 140ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-143-4

MAX6443US46L+T FAQ

1.How can I place an order for MAX6443US46L+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6443US46L+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 MAX6443US46L+T reliable?

The price and inventory of MAX6443US46L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6443US46L+T is usually 5 days.

3.What payment methods are accepted for MAX6443US46L+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6443US46L+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6443US46L+T?

MAX6443US46L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6443US46L+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 MAX6443US46L+T?

For technical support, including MAX6443US46L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6443US46L+T requirements.

6.How does Aetrix verify that MAX6443US46L+T is sourced from the original manufacturer or authorized distributors?

All MAX6443US46L+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 MAX6443US46L+T meets industry standards.

7.What is the process for return or replacement of MAX6443US46L+T?

All MAX6443US46L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6443US46L+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 MAX6443US46L+T part is unused and in its original packaging.

Return procedure for MAX6443US46L+T:

1.Submit a request within 90 days.

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

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