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Analog Devices Inc./Maxim Integrated MAX6444US16K+T
- Part No.:
- MAX6444US16K+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6444US16K+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3L
- Quantity:
- Payment:
- Shipping:
Inventory:2,346
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Product details
Overview
MAX6444US16K+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with one extended-setup manual reset input (MR1), active-low open-drain RESET output, 1.575V VCC reset threshold, and 1.68s manual reset setup period. It monitors VCC only, asserts RESET when VCC drops below threshold, holds RESET low for 210ms (typ) after recovery, and operates across –40°C to +85°C in a 4-pin SOT143 package - used in set-top boxes and DVD players for reliable power-on reset and nuisance-reset immunity.
For engineers reviewing the MAX6444US16K+T datasheet, MAX6444US16K+T pinout, MAX6444US16K+T application, or MAX6444US16K+T equivalent, key selection criteria include its 1.575V factory-set reset threshold, 1.68s MR1 hold time requirement, open-drain RESET logic, 6µA supply current, and guaranteed operation down to VCC = 1.0V - all critical for brownout detection and front-panel pushbutton reset implementation in consumer electronics.
Technical Context
The MAX6444US16K+T implements a precision voltage monitor with a fixed 1.575V reset threshold (±1.5% over temperature), 60ppm/°C tempco, and 2×VTH hysteresis. Its internal timing circuit enforces a 1.68s minimum low pulse width on MR1 before asserting RESET - preventing false resets from switch bounce or brief button presses.
RESET is an active-low open-drain output requiring an external pullup resistor (≥20kΩ to VCC); it guarantees valid logic state for VCC ≥ 1.0V and sinks up to 3.2mA at VCC ≥ 4.25V. The device uses BiCMOS process and draws only 6µA typical supply current at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±1.5% - precisely triggers reset during 1.6V–1.8V supply brownout conditions |
| Manual Reset Setup Period | 1.68s (T suffix) - prevents nuisance resets from short front-panel switch closures |
| Reset Timeout Period | 140ms min / 210ms typ - ensures µP completes full reset initialization before release |
| Supply Current | 6µA typ at 3.6V - enables always-on monitoring in battery-backed systems |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout |
| Output Type | Active-low open-drain - allows level-shifting and wired-OR reset bus configurations |
| Temperature Range | –40°C to +85°C - supports industrial and consumer equipment deployment |
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 for all internal comparators and output stage |
| 2 | VCC | Main power supply input and monitored voltage source (1.0V–5.5V) |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup; requires ≥1.68s low pulse to trigger RESET |
| 4 | RESET | Active-low open-drain output; requires external pullup resistor (≥20kΩ) to VCC or another logic rail |
Key Features
| Feature | Design Value |
|---|---|
| Extended MR1 setup period | 1.68s hold time eliminates false resets from mechanical switch bounce or accidental presses |
| Precision reset threshold | 1.575V ±1.5% with 60ppm/°C tempco ensures stable trip point across industrial temperature range |
| Low quiescent current | 6µA typical at 3.6V enables integration into always-on subsystems without significant battery drain |
| Valid RESET down to VCC = 1.0V | Guarantees correct reset assertion during deep brownout, preventing µP lockup or undefined behavior |
| Open-drain RESET output | Supports multi-source reset buses and level translation to 0–6V logic domains via external pullup |
Applications
| Set-Top Box Power Management | DVD Player System Reset |
|---|---|
Use Scenario: Monitors main 3.3V supply during cold start and brownout events in digital broadcast receivers. IC Role / Device Role / Timing Role: Single-supply reset supervisor asserting active-low RESET to ARM-based SoC upon VCC drop below 1.575V. Use Value: Prevents corrupted firmware execution by enforcing 210ms minimum reset pulse width after supply recovery. | Use Scenario: Provides reliable reset initiation triggered by front-panel power button in portable DVD players. IC Role / Device Role / Timing Role: Manual reset controller using MR1 with 1.68s setup period to distinguish power-on from channel-up commands. Use Value: Eliminates unintended resets during normal button operation while enabling deliberate hard reset via sustained press. |
| Cable Modem Boot Integrity | Industrial Control Panel Reset |
Use Scenario: Ensures deterministic boot sequence in DOCSIS-compliant cable modems exposed to line-voltage fluctuations. IC Role / Device Role / Timing Role: VCC supervisor monitoring 1.8V core supply; asserts RESET if voltage sags below 1.575V for >20µs. Use Value: Immunity to sub-20µs transients avoids spurious resets during RF interference or switching noise events. | Use Scenario: Delivers fail-safe reset capability in programmable logic controller (PLC) human-machine interface panels. IC Role / Device Role / Timing Role: Industrial-grade reset IC operating from –40°C to +85°C, interfacing to 24V system via level-shifted RESET pullup. Use Value: Guaranteed function at VCC = 1.0V ensures reset remains asserted until supply stabilizes post-brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6444US16L+T | Same 1.575V threshold and SOT143 package, but 6.72s MR1 setup period (L suffix vs. T) | Requires longer button press for reset - less suitable for user-facing interfaces needing quick recovery | Select only if enhanced nuisance-reset immunity outweighs user experience requirements |
| TPS3808G16DBVR | 1.6V threshold, 200ms timeout, push-pull RESET, 1.6µA ICC - no extended MR1, different pinout (SOT23-5) | Lacks manual reset debounce; requires external RC or GPIO-driven reset logic | Choose when minimal supply current and push-pull simplicity are prioritized over mechanical switch tolerance |
Compared with MAX6444US16K+T, the L-suffix variant trades faster user-initiated reset for stronger glitch immunity, while the TPS3808G16DBVR reduces current draw and simplifies board layout but forfeits the integrated long-hold manual reset functionality essential for front-panel designs.
Availability
MAX6444US16K+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 front-panel reset implementation.
Supply support for MAX6444US16K+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 connectivity applications.
The MAX6443–MAX6452 family delivers microprocessor supervisory circuits optimized for consumer and industrial systems where immunity to switch bounce, transient noise, and brownout conditions is mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6444US16K+T?
The MAX6444US16K+T has a factory-set VCC reset threshold of 1.575V, with ±1.5% tolerance over the –40°C to +85°C temperature range and 60ppm/°C tempco. This value is confirmed in Table 1 of the datasheet under suffix "16", and applies specifically to the MAX6444US16K+T - not to other variants in the MAX6443–MAX6452 family.
Does the MAX6444US16K+T support dual manual reset inputs?
No, the MAX6444US16K+T supports only a single extended-setup manual reset input (MR1). Dual MR inputs are implemented in MAX6445/MAX6446 and MAX6449/MAX6450 variants. The MAX6444US16K+T pinout (SOT143, 4-pin) physically lacks MR2, and its functional diagram confirms MR1-only operation.
What is the required external pullup resistor value for the MAX6444US16K+T RESET pin?
The MAX6444US16K+T RESET pin is open-drain and requires a minimum 20kΩ pullup resistor to VCC or another logic rail. A 47kΩ–100kΩ resistor is commonly used to balance rise time and current consumption. The datasheet specifies that lower values improve rise time but increase static current; higher values reduce current but may slow edge transitions in noisy environments.
Can the MAX6444US16K+T monitor voltages other than VCC?
No, the MAX6444US16K+T monitors VCC only. Adjustable external voltage monitoring via RSTIN is available only in MAX6449–MAX6452 variants. The MAX6444US16K+T pinout omits RSTIN, and its functional description explicitly states it is a single fixed-voltage µP supervisor - confirming no RSTIN capability.
Is the MAX6444US16K+T qualified for automotive applications?
No, the MAX6444US16K+T is rated for the extended industrial temperature range (–40°C to +85°C) but is not AEC-Q100 qualified. Automotive qualification is indicated by the "/V" suffix (e.g., MAX6444US16K/V+T). The MAX6444US16K+T ordering code lacks "/V", and the datasheet lists AEC-Q100 qualification only for parts explicitly marked with "/V".
MAX6444US16K+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:
- 1.575V
- Output:
- Open Drain or Open Collector
- 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
MAX6444US16K+T FAQ
1.How can I place an order for MAX6444US16K+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6444US16K+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 MAX6444US16K+T reliable?
The price and inventory of MAX6444US16K+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6444US16K+T is usually 5 days.
3.What payment methods are accepted for MAX6444US16K+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6444US16K+T transactions.
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4.How is shipping managed for MAX6444US16K+T?
MAX6444US16K+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6444US16K+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 MAX6444US16K+T?
For technical support, including MAX6444US16K+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6444US16K+T requirements.
6.How does Aetrix verify that MAX6444US16K+T is sourced from the original manufacturer or authorized distributors?
All MAX6444US16K+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 MAX6444US16K+T meets industry standards.
7.What is the process for return or replacement of MAX6444US16K+T?
All MAX6444US16K+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6444US16K+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 MAX6444US16K+T part is unused and in its original packaging.
Return procedure for MAX6444US16K+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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