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Analog Devices Inc./Maxim Integrated MAX6446UK29L-T
- Part No.:
- MAX6446UK29L-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6446UK29L-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
MAX6446UK29L-T from Maxim Integrated is a dual-input, fixed-threshold microprocessor supervisory circuit with extended manual reset setup period and active-low push-pull RESET output. It monitors VCC at 2.925V ±1.5%, asserts RESET for 140ms (min) after voltage recovery or manual reset assertion, and operates over -40°C to +85°C in 5-pin SOT23 package. Used in set-top boxes and cable modems to prevent nuisance resets from front-panel switches.
For engineers reviewing the MAX6446UK29L-T datasheet, MAX6446UK29L-T pinout, MAX6446UK29L-T application, or MAX6446UK29L-T equivalent, key selection criteria include its dual extended-setup MR1/MR2 inputs, guaranteed RESET validity down to VCC = 1.0V, 6µA supply current, and immunity to transients <20µs at 100mV overdrive - critical for reliable power-on sequencing and field-service reset functions.
Technical Context
The MAX6446UK29L-T implements dual manual reset inputs (MR1 and MR2), both requiring simultaneous low assertion for the full 6.72s extended setup period before generating a one-shot RESET pulse. Its internal 50kΩ pullup on each MR pin enables direct connection to mechanical switches without external components.
It features a fixed 2.925V VCC reset threshold with 60ppm/°C tempco and 2×VTH hysteresis, guaranteeing stable brownout detection across industrial temperature range. The push-pull RESET output drives low to ≤0.3V at 1.2mA sink current and deasserts to ≥0.8×VCC, eliminating need for external pullup resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±1.5% - precisely holds system reset until main supply stabilizes above nominal 3.3V rail |
| Reset Timeout Period | 140ms min - ensures µP completes full initialization before release from reset state |
| Manual Reset Setup Period | 6.72s (L-suffix) - prevents accidental resets from brief button presses during normal operation |
| Supply Current | 6µA typical at 3.6V - enables always-on supervision in battery-backed or low-power consumer devices |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET logic even during deep brownout conditions |
| RESET Output Type | Active-low push-pull - eliminates external pullup resistor and supports direct interface to CMOS µP reset inputs |
| Temperature Range | -40°C to +85°C - fully specified for industrial and automotive cabin applications |
Pinout & Package
MAX6446UK29L-T is housed in a 5-pin SOT23 package (package code U5-1), with exposed pad not electrically connected. Pin 1 is GND, pin 2 is VCC, pin 3 is MR1, pin 4 is MR2, and pin 5 is RESET. All pins support absolute maximum voltages up to +6V referenced to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal comparators and output driver; must be low-impedance connection to system ground plane |
| VCC (Pin 2) | Supply and monitored voltage input | Powers the IC and serves as primary reset monitor; device asserts RESET when this voltage drops below 2.925V |
| MR1 (Pin 3) | Extended manual reset input | Active-low input with internal 50kΩ pullup; must be held low simultaneously with MR2 for 6.72s to trigger RESET |
| MR2 (Pin 4) | Extended manual reset input | Active-low input with internal 50kΩ pullup; both MR1 and MR2 must be low for full setup period to avoid false triggers |
| RESET (Pin 5) | Active-low push-pull reset output | Drives low to ≤0.3V (at 1.2mA) to hold µP in reset; releases to ≥0.8×VCC when timeout expires or supply recovers |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended-setup manual reset inputs | MR1 and MR2 require simultaneous 6.72s low assertion - prevents accidental resets from single-button presses in consumer front panels |
| Guaranteed RESET validity down to VCC = 1.0V | Ensures deterministic reset behavior during severe brownout; no external circuitry needed to maintain logic state |
| Immunity to short voltage transients | Rejects transients ≤20µs duration when VCC dips 100mV below threshold - avoids spurious resets from switching noise or ESD |
| Low 6µA supply current | Enables permanent supervision in always-on systems such as cable modems and medical monitors without impacting standby power budget |
| Push-pull RESET output | Eliminates need for external pullup resistor and simplifies PCB layout; compatible with standard CMOS µP reset inputs |
Applications
| Set-Top Box Power Management | Cable Modem System Recovery |
|---|---|
Use Scenario: Front-panel power button initiates controlled system boot or hard reset based on press duration. IC Role / Device Role / Timing Role: MAX6446UK29L-T monitors 3.3V rail and interprets dual-button press (MR1+MR2) as service-mode reset command. Use Value: 6.72s extended setup prevents accidental resets during normal channel navigation while enabling field-service recovery. |
Use Scenario: Remote firmware update fails; user performs hardware reset via front-panel buttons. IC Role / Device Role / Timing Role: MAX6446UK29L-T generates clean 140ms minimum RESET pulse only after confirmed dual-button hold, ensuring µP restarts from known state. Use Value: Dual-MR architecture eliminates false triggers from EMI or contact bounce, improving update reliability. |
| DVD Player Brownout Protection | Industrial HMI Panel Supervision |
Use Scenario: Mains voltage sags during playback cause partial system lockup requiring supervised restart. IC Role / Device Role / Timing Role: MAX6446UK29L-T continuously monitors 3.3V supply and asserts RESET if voltage falls below 2.925V for >210ms (typ). Use Value: Precision threshold and 60ppm/°C tempco ensure consistent brownout response across operating temperature range. |
Use Scenario: Operator panel in factory environment requires tamper-resistant reset function accessible only via dual-key switch. IC Role / Device Role / Timing Role: MAX6446UK29L-T acts as secure reset arbiter: both MR1 and MR2 must be asserted for 6.72s to initiate controller reset. Use Value: Extended setup period enforces deliberate operator action, preventing unintended machine restarts during maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6445UK29L-T | Same 2.925V threshold and 6.72s setup, but push-pull RESET output (MAX6446UK29L-T also has push-pull); identical pinout and electrical specs | No functional difference - both support dual MR inputs and same timing; MAX6445UK29L-T is functionally identical variant | Select MAX6445UK29L-T only if legacy design documentation references that part number; otherwise MAX6446UK29L-T is direct replacement |
| TPS3808G33DBVR | Single MR input, 3.08V threshold (±0.5%), 200ms timeout, 1.6µA quiescent current; SOT23-5 package with same pinout except MR2 pin repurposed as EN | Lacks dual-MR security; suited for simpler reset requirements where single-button reset suffices | Choose TPS3808G33DBVR only when dual-MR functionality is unnecessary and ultra-low current (<2µA) is prioritized over reset robustness |
Compared with MAX6445UK29L-T, MAX6446UK29L-T offers identical functionality and pin compatibility; versus TPS3808G33DBVR, it trades lower quiescent current for mandatory dual-MR activation - a deliberate design choice for tamper-resistant consumer electronics reset paths.
Availability
MAX6446UK29L-T is available at Aetrix Electronics and suitable for set-top boxes, cable modems, DVD players, and industrial HMIs requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6446UK29L-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 industrial, communications, and consumer applications, with emphasis on high-reliability power management and supervisory solutions.
The MAX6443–MAX6452 family was developed specifically for robust microprocessor supervision in cost-sensitive consumer electronics, featuring extended manual reset setup to eliminate nuisance resets from mechanical switches and front-panel controls.
FAQ
What is the exact reset threshold voltage of the MAX6446UK29L-T?
The MAX6446UK29L-T has a factory-set VCC reset threshold of 2.925V, with ±1.5% tolerance over temperature and 60ppm/°C tempco. This value is defined by the "29" suffix per Table 1 in the datasheet and is laser-trimmed during production for precision monitoring of 3.3V rails.
Does the MAX6446UK29L-T support open-drain RESET output?
No, the MAX6446UK29L-T features an active-low push-pull RESET output only. The "U" in the package code (UK29L-T) and ordering table confirm it is the push-pull variant; open-drain versions use "US" or "UT" prefixes (e.g., MAX6446US29L-T). Push-pull eliminates need for external pullup resistors.
What is the purpose of the dual manual reset inputs MR1 and MR2 on the MAX6446UK29L-T?
The dual MR1 and MR2 inputs on the MAX6446UK29L-T require simultaneous low assertion for the full 6.72s setup period to generate a RESET pulse. This prevents accidental resets from single-button presses and enforces deliberate user action - essential for service-mode recovery in consumer electronics like set-top boxes.
Can the MAX6446UK29L-T operate reliably when VCC drops below 1.0V?
The MAX6446UK29L-T guarantees valid RESET output logic only down to VCC = 1.0V. Below this, RESET current-sinking capability degrades and output state becomes indeterminate. For applications requiring reset assertion down to 0V, a pulldown resistor must be added externally - but only for push-pull variants like the MAX6446UK29L-T.
What package type and footprint does the MAX6446UK29L-T use?
The MAX6446UK29L-T uses a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174), with pin 1 = GND, pin 2 = VCC, pin 3 = MR1, pin 4 = MR2, and pin 5 = RESET. It is lead(Pb)-free compliant; the "-T" suffix denotes tape-and-reel packaging with 2500-piece minimum order quantity.
MAX6446UK29L-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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-23-5
MAX6446UK29L-T FAQ
1.How can I place an order for MAX6446UK29L-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6446UK29L-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 MAX6446UK29L-T reliable?
The price and inventory of MAX6446UK29L-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6446UK29L-T is usually 5 days.
3.What payment methods are accepted for MAX6446UK29L-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6446UK29L-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6446UK29L-T?
MAX6446UK29L-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6446UK29L-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 MAX6446UK29L-T?
For technical support, including MAX6446UK29L-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6446UK29L-T requirements.
6.How does Aetrix verify that MAX6446UK29L-T is sourced from the original manufacturer or authorized distributors?
All MAX6446UK29L-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 MAX6446UK29L-T meets industry standards.
7.What is the process for return or replacement of MAX6446UK29L-T?
All MAX6446UK29L-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6446UK29L-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 MAX6446UK29L-T part is unused and in its original packaging.
Return procedure for MAX6446UK29L-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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