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

Analog Devices Inc./Maxim Integrated MAX6443US29L+T

Name: MAX6443US29L+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6443US29L+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6443US29L+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

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

Datasheet:: MAX6443US29L+T.pdf

Description:: IC MPU RESET 2.925V SOT143-4

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Product details

Overview

MAX6443US29L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with one extended-setup manual reset input (MR1), active-low push-pull RESET output, and 2.925V V_CC reset threshold. It monitors V_CC only, asserts RESET for 210ms (typ) after V_CC recovery, and requires MR1 to be held low ≥6.72s to trigger a manual reset pulse. Used in set-top boxes and DVD players for reliable power-on initialization.

For engineers reviewing the MAX6443US29L+T datasheet, MAX6443US29L+T pinout, MAX6443US29L+T application, or MAX6443US29L+T equivalent, key selection criteria include its 2.925V fixed reset threshold, 6.72s manual reset setup period, SOT143-4 package, -40°C to +85°C operation, and guaranteed RESET validity down to V_CC = 1.0V.

Technical Context

The MAX6443US29L+T implements a precision voltage monitor with factory-trimmed 2.925V reset threshold (±0.075V), 60ppm/°C tempco, and 2×V_TH hysteresis. Its internal timing circuit enforces a 6.72s minimum low-time on MR1 before asserting RESET, rejecting nuisance switch closures.

RESET is a push-pull output guaranteed functional from V_CC = 1.0V to 5.5V, with VOL ≤ 0.3V at ISINK = 50µA and VOH ≥ 0.8×V_CC at ISOURCE = 200µA. The device draws only 6µA (typ) at V_CC = 3.6V and operates across the full industrial temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Reset Threshold	2.925V ±0.075V - precise brownout detection point for 3.3V systems
Manual Reset Setup Period (t_MR)	6.72s (L suffix) - prevents accidental resets from brief front-panel button presses
Reset Timeout Period	210ms (typ), 140ms (min) - ensures µP reset pulse meets minimum assertion time requirements
Supply Current (I_CC)	6µA (typ) at 3.6V - enables ultra-low-power always-on monitoring in battery-backed systems
Operating Voltage Range	1.0V to 5.5V - guarantees valid RESET output even during deep brownout conditions
Package	SOT143-4 - compact 1.3mm × 2.1mm footprint for space-constrained consumer PCBs
Temperature Range	-40°C to +85°C - qualified for industrial and automotive cabin applications

Pinout & Package

MAX6443US29L+T is housed in a 4-pin SOT143 package (U4+1 outline). Pin 1 is GND, Pin 2 is V_CC, Pin 3 is MR1, and Pin 4 is RESET. All pins are rated for -0.3V to +6V absolute max, with MR1 featuring an internal 50kΩ pullup to V_CC.

Pin	Circuit Role	Design Meaning
1	GND	Ground reference for all internal comparators and output drivers
2	V_CC	Main supply input and monitored voltage source for primary reset function
3	MR1	Active-low manual reset input with 6.72s extended setup requirement; internally pulled up to V_CC
4	RESET	Active-low push-pull output; drives µP reset pin directly without external pullup

Key Features

Feature	Design Value
Extended Manual Reset Setup	6.72s MR1 hold time eliminates false resets from mechanical switch bounce or user hesitation
Precision Fixed Reset Threshold	2.925V ±0.075V threshold optimized for 3.3V rail monitoring with 60ppm/°C stability
Low-Power Operation	6µA typical supply current enables integration into always-on subsystems without impacting battery life
Valid RESET Down to 1.0V V_CC	Guaranteed logic-level RESET output even as main supply collapses, ensuring deterministic µP behavior
Push-Pull RESET Output	Eliminates need for external pullup resistor, reducing BOM count and PCB area in cost-sensitive designs

Applications

Set-Top Box Power Sequencing	DVD Player Brownout Recovery
Use Scenario: Monitors 3.3V supply during AC power cycling and thermal shutdown events. IC Role / Device Role / Timing Role: Primary V_CC supervisor generating 210ms reset pulse to initialize MPEG decoder and UI controller. Use Value: Prevents corrupted video playback by ensuring complete firmware reload after undervoltage events.	Use Scenario: Detects transient dips on 3.3V rail caused by laser sled motor startup. IC Role / Device Role / Timing Role: Single-supply reset generator with 2.925V threshold and 6.72s MR1 debounce for front-panel reset button. Use Value: Eliminates spurious resets during normal operation while enabling deliberate hard reset via long button press.
Cable Modem Boot Integrity	Industrial HMI Panel Initialization
Use Scenario: Ensures clean boot sequence after PoE injector power-up transients. IC Role / Device Role / Timing Role: Fixed-threshold supervisor asserting RESET until 3.3V rail stabilizes above 2.925V for ≥210ms. Use Value: Guarantees DSP and PHY firmware execute from known state, preventing packet loss on first Ethernet frame.	Use Scenario: Provides deterministic reset during cold start in factory-floor control panels. IC Role / Device Role / Timing Role: Industrial-grade reset IC with -40°C to +85°C operation and 6µA quiescent current. Use Value: Enables reliable field deployment without derating or thermal margin concerns in uncontrolled environments.

Set-Top Box Power Sequencing

DVD Player Brownout Recovery

Use Scenario: Monitors 3.3V supply during AC power cycling and thermal shutdown events.

IC Role / Device Role / Timing Role: Primary V_CC supervisor generating 210ms reset pulse to initialize MPEG decoder and UI controller.

Use Value: Prevents corrupted video playback by ensuring complete firmware reload after undervoltage events.

Use Scenario: Detects transient dips on 3.3V rail caused by laser sled motor startup.

IC Role / Device Role / Timing Role: Single-supply reset generator with 2.925V threshold and 6.72s MR1 debounce for front-panel reset button.

Use Value: Eliminates spurious resets during normal operation while enabling deliberate hard reset via long button press.

Cable Modem Boot Integrity

Industrial HMI Panel Initialization

Use Scenario: Ensures clean boot sequence after PoE injector power-up transients.

IC Role / Device Role / Timing Role: Fixed-threshold supervisor asserting RESET until 3.3V rail stabilizes above 2.925V for ≥210ms.

Use Value: Guarantees DSP and PHY firmware execute from known state, preventing packet loss on first Ethernet frame.

Use Scenario: Provides deterministic reset during cold start in factory-floor control panels.

IC Role / Device Role / Timing Role: Industrial-grade reset IC with -40°C to +85°C operation and 6µA quiescent current.

Use Value: Enables reliable field deployment without derating or thermal margin concerns in uncontrolled environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6316LUK29D3+T	Same 2.93V threshold, 140ms timeout, but SOT23-5 package with open-drain RESET and no MR1 setup extension	Lacks extended manual reset; suitable only where simple pushbutton reset suffices	Select when board layout allows SOT23-5 and system does not require nuisance-proof manual reset
TPS3808G18DBVR	1.8V threshold, 200ms timeout, adjustable delay, SOT23-6, but no extended manual reset capability	Designed for lower-voltage rails; requires external RC network for delay tuning	Choose for 1.8V domain supervision where programmable timeout is preferred over fixed 6.72s MR1 hold

Compared with MAX6443US29L+T, MAX6316LUK29D3+T offers identical threshold accuracy but lacks the 6.72s MR1 debounce essential for consumer front-panel reliability, while TPS3808G18DBVR targets different voltage domains and requires external components for timing control-neither provides the integrated long-setup manual reset functionality critical for set-top box and DVD player use cases.

Availability

MAX6443US29L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and cable modems requiring stable component supply, long-term industrial temperature support, and robust manual reset immunity.

Supply support for MAX6443US29L+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.

The MAX6443–MAX6452 family delivers highly reliable µP reset supervision with extended manual reset setup periods, targeting consumer electronics and industrial equipment where nuisance-free front-panel reset is critical.

FAQ

What is the exact reset threshold voltage of the MAX6443US29L+T?

The MAX6443US29L+T has a factory-set V_CC reset threshold of 2.925V, with a guaranteed tolerance of ±0.075V (2.85V to 3.00V) over temperature. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" for suffix "29", and applies across the full -40°C to +85°C operating range with 60ppm/°C tempco.

How does the manual reset function work on the MAX6443US29L+T?

The MAX6443US29L+T features a single extended-setup manual reset input (MR1) that must be held low for ≥6.72 seconds (L suffix) to assert the RESET output. Shorter pulses are ignored, preventing accidental resets. MR1 has an internal 50kΩ pullup to V_CC, so a simple SPST switch to ground suffices. Once asserted, RESET remains low for 210ms (typ) regardless of MR1 state.

Is the RESET output of the MAX6443US29L+T push-pull or open-drain?

The MAX6443US29L+T uses a push-pull RESET output, as confirmed by the Ordering Information table (MAX6443 row shows "✔" under "PUSH-PULL RESET") and Pin Description (RESET pin function states "Active-Low Push-Pull or Open-Drain Output"). This eliminates the need for an external pullup resistor and ensures strong drive capability across the full 1.0V–5.5V V_CC range.

What package type and pin count does the MAX6443US29L+T use?

The MAX6443US29L+T is packaged in a 4-pin SOT143 (U4+1 outline), with dimensions 1.3mm × 2.1mm. Pin configuration is GND (1), V_CC (2), MR1 (3), RESET (4), as shown in the "Pin Configurations" section and confirmed by the "MAX6443/MAX6444 SOT143" top view diagram on page 10 of the datasheet.

Does the MAX6443US29L+T support operation below 1.0V V_CC?

The MAX6443US29L+T guarantees valid RESET output logic only down to V_CC = 1.0V, as specified in the Absolute Maximum Ratings and Features list ("Guaranteed Valid Reset Down to VCC = 1.0V"). Below 1.0V, RESET current-sinking capability degrades; for applications requiring reset assertion down to 0V, a 100kΩ pulldown resistor is recommended per the "Ensuring a Valid RESET Down to VCC = 0V" section.

MAX6443US29L+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:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.925V

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

MAX6443US29L+T FAQ

1.How can I place an order for MAX6443US29L+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6443US29L+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 MAX6443US29L+T reliable?

The price and inventory of MAX6443US29L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6443US29L+T is usually 5 days.

3.What payment methods are accepted for MAX6443US29L+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6443US29L+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6443US29L+T?

MAX6443US29L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6443US29L+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 MAX6443US29L+T?

For technical support, including MAX6443US29L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6443US29L+T requirements.

6.How does Aetrix verify that MAX6443US29L+T is sourced from the original manufacturer or authorized distributors?

All MAX6443US29L+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 MAX6443US29L+T meets industry standards.

7.What is the process for return or replacement of MAX6443US29L+T?

All MAX6443US29L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6443US29L+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 MAX6443US29L+T part is unused and in its original packaging.

Return procedure for MAX6443US29L+T:

1.Submit a request within 90 days.

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

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