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Analog Devices Inc./Maxim Integrated MAX6446UK29L
- Part No.:
- MAX6446UK29L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6446UK29L.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:389
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Product details
Overview
The MAX6446UK29L from Maxim Integrated is a dual-input, fixed-threshold microprocessor supervisor IC with extended manual reset setup period, 2.925V VCC reset threshold, 6.72s MR1/MR2 hold time, active-low open-drain RESET output, and guaranteed operation from -40°C to +85°C - used in cable modems and set-top boxes to prevent nuisance resets during front-panel button presses.
For engineers reviewing the MAX6446UK29L datasheet, MAX6446UK29L pinout, MAX6446UK29L application, or MAX6446UK29L equivalent, key selection considerations include its dual extended-setup manual reset inputs (MR1 & MR2), 2.925V precision reset threshold, 6.72s minimum valid reset pulse width, and SOT23-5 open-drain output compatible with 3.3V/5V systems.
Technical Context
The MAX6446UK29L implements a dual extended-setup manual reset architecture: both MR1 and MR2 must be held low simultaneously for ≥6.72s (tMR = L suffix) before asserting a one-shot RESET pulse. Its internal comparators monitor VCC against a factory-trimmed 2.925V threshold with ±0.075V tolerance and 60ppm/°C tempco.
RESET remains asserted for 140ms (min) after VCC recovers above threshold or after valid MR1+MR2 assertion. The open-drain output requires an external pullup resistor (≥20kΩ to VCC) and sinks up to 3.2mA at VCC ≥4.25V while consuming only 6µA typical supply current at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±0.075V - precise brownout detection point for 3.3V systems |
| Manual Reset Setup Period (tMR) | 6.72s - prevents false resets from brief switch closures |
| Reset Timeout Period (tRP) | 140ms min - ensures µP completes full reset initialization |
| Supply Current (ICC) | 6µA typ at 3.6V - enables always-on monitoring in battery-backed systems |
| Operating Temperature | -40°C to +85°C - qualified for industrial and consumer equipment environments |
| Output Type | Active-low open-drain - supports level-shifting and wired-OR configurations |
| Package | 5-pin SOT23 - 2.9mm × 1.6mm footprint for space-constrained PCBs |
Pinout & Package
MAX6446UK29L is housed in a 5-pin SOT23 package (U5+1 outline), with exposed pad not electrically connected. Pin 1 is GND, pin 2 is VCC, pin 3 is MR1, pin 4 is RESET, and pin 5 is MR2 - all pins rated for -0.3V to +6V absolute max voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for VCC, MR1, MR2, and RESET; must be low-impedance |
| 2 (VCC) | Primary supply input | Powers internal circuitry and serves as monitored voltage source for 2.925V reset threshold |
| 3 (MR1) | Extended manual reset input | Active-low input with 50kΩ internal pullup; must be held low ≥6.72s with MR2 to trigger RESET |
| 4 (RESET) | Open-drain reset output | Drives low for 140ms min upon valid reset condition; requires external pullup to system VCC |
| 5 (MR2) | Second extended manual reset input | Active-low input with 50kΩ internal pullup; dual-MR assertion required for reset initiation |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended-setup manual reset inputs | MR1 and MR2 both require ≥6.72s low assertion - eliminates accidental resets from single-button presses |
| Precision 2.925V reset threshold | Factory-trimmed ±0.075V tolerance with 60ppm/°C tempco - ensures stable brownout detection across temperature |
| Ultra-low 6µA supply current | Enables permanent connection to main supply without impacting standby power budget in consumer electronics |
| Guaranteed RESET validity down to VCC = 1.0V | Ensures reliable processor reset signaling even during deep brownout conditions before power collapse |
| Open-drain RESET output | Supports multi-drop reset buses and level translation to higher-voltage logic domains (e.g., 5V µP from 3.3V VCC) |
Applications
| Cable Modems | Set-Top Boxes |
|---|---|
Use Scenario: Front-panel reset button must distinguish between channel-up command (short press) and full system reboot (long press). IC Role / Device Role / Timing Role: MAX6446UK29L monitors VCC and validates dual-button long-press via MR1+MR2 to assert RESET only after 6.72s. Use Value: Prevents service interruption from accidental button taps while enabling field-recoverable reboots without power cycling. | Use Scenario: Power-on sequence requires deterministic µP reset timing after 3.3V rail stabilizes, plus user-initiated recovery from software lockup. IC Role / Device Role / Timing Role: MAX6446UK29L provides 2.925V VCC supervision and 140ms min timeout to meet STB boot specification, with MR1+MR2 enabling safe factory reset. Use Value: Eliminates need for external RC timing networks and reduces BOM count versus discrete reset solutions. |
| DVD Players | Industrial Control Panels |
Use Scenario: User interface includes mechanical buttons shared between navigation and hard reset functions. IC Role / Device Role / Timing Role: MAX6446UK29L debounces MR1+MR2 inputs internally - no external capacitors or firmware debounce required. Use Value: Reduces firmware complexity and avoids missed reset events due to inconsistent mechanical switch bounce. | Use Scenario: Harsh environment with EMI-induced voltage transients on 3.3V supply rail. IC Role / Device Role / Timing Role: MAX6446UK29L rejects transients ≤20µs at 100mV overdrive below 2.925V threshold per Typical Operating Characteristics graph. Use Value: Maintains system uptime by ignoring noise spikes that would falsely trigger µP reset in less robust supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6445UK29L | Same 2.925V threshold and 6.72s tMR, but lacks MR2 - single MR1 input only | Suitable where only one front-panel reset button exists; no dual-button security requirement | Select when cost reduction is prioritized and dual-MR immunity is unnecessary |
| TPS3808G33DBVR | 2.93V threshold, 200ms timeout, 1.6µA ICC, but only single manual reset input with 1.6s setup time | Lower quiescent current and faster reset response, but no dual extended-setup capability | Choose for ultra-low-power applications where dual-MR protection is not mandated |
Compared with MAX6445UK29L, the MAX6446UK29L adds MR2 for enhanced reset security; compared with TPS3808G33DBVR, it trades lower ICC for superior nuisance-reset immunity via longer, dual-input setup timing - critical in consumer UI designs.
Availability
MAX6446UK29L is available at Aetrix Electronics and suitable for cable modems, set-top boxes, and industrial control panels requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6446UK29L 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.
The MAX6443–MAX6452 family delivers high-immunity µP reset supervision with configurable manual reset architectures - engineered specifically for front-panel interfaces in set-top boxes, modems, and media players where accidental resets must be eliminated.
FAQ
What is the exact reset threshold voltage of the MAX6446UK29L?
The MAX6446UK29L has a factory-set VCC reset threshold of 2.925V, with a guaranteed tolerance of ±0.075V (2.85V to 3.00V) over -40°C to +85°C. This value is defined by the "29" suffix in the part number and confirmed in Table 1 of the datasheet. The MAX6446UK29L uses this threshold to detect brownout conditions on the monitored 3.3V supply rail.
How does the dual manual reset function work on the MAX6446UK29L?
The MAX6446UK29L requires both MR1 and MR2 inputs to be held low simultaneously for ≥6.72 seconds (tMR = L suffix) before asserting the RESET output. Neither input alone triggers reset - this dual-input requirement prevents accidental resets from single-button presses. The MAX6446UK29L implements internal 50kΩ pullups on both MR1 and MR2, simplifying front-panel switch interfacing.
What is the minimum reset timeout period for the MAX6446UK29L?
The MAX6446UK29L guarantees a reset timeout period of 140ms minimum after VCC recovers above threshold or after valid MR1+MR2 assertion. The typical value is 210ms, and maximum is 280ms. This timeout ensures sufficient duration for microprocessors to complete internal initialization sequences - a critical timing parameter verified across temperature and voltage corners in the Electrical Characteristics table.
Does the MAX6446UK29L support open-drain or push-pull RESET output?
MAX6446UK29L features an active-low open-drain RESET output, as indicated by the "K" in its package code (U5+1) and confirmed in the Ordering Information table. It requires an external pullup resistor (minimum 20kΩ to VCC) and can sink up to 3.2mA at VCC ≥4.25V. Unlike push-pull variants (e.g., MAX6445US29L), the MAX6446UK29L does not drive high - enabling wired-OR reset bus configurations.
What package type and pin count does the MAX6446UK29L use?
The MAX6446UK29L is packaged in a 5-pin SOT23 (U5+1 outline), measuring 2.9mm × 1.6mm with 0.95mm height. Pin 1 is GND, pin 2 is VCC, pin 3 is MR1, pin 4 is RESET, and pin 5 is MR2 - consistent with the MAX6445/MAX6446 functional grouping shown in the Pin Configurations section. This package is RoHS-compliant and tape-and-reel delivered.
MAX6446UK29L 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 FAQ
1.How can I place an order for MAX6446UK29L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6446UK29L 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 reliable?
The price and inventory of MAX6446UK29L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6446UK29L is usually 5 days.
3.What payment methods are accepted for MAX6446UK29L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6446UK29L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6446UK29L?
MAX6446UK29L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6446UK29L 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?
For technical support, including MAX6446UK29L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6446UK29L requirements.
6.How does Aetrix verify that MAX6446UK29L is sourced from the original manufacturer or authorized distributors?
All MAX6446UK29L 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 meets industry standards.
7.What is the process for return or replacement of MAX6446UK29L?
All MAX6446UK29L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6446UK29L, 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 part is unused and in its original packaging.
Return procedure for MAX6446UK29L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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