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Analog Devices Inc./Maxim Integrated MAX6446UK31L+G65
- Part No.:
- MAX6446UK31L+G65
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6446UK31L+G65.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:779
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Product details
Overview
MAX6446UK31L+G65 from Maxim Integrated is a dual-input, fixed-threshold microprocessor supervisory circuit with extended manual reset setup period (6.72s), 3.075V VCC reset threshold, and open-drain active-low RESET output. It monitors a single supply (VCC) and features two active-low manual reset inputs (MR1 and MR2) requiring simultaneous assertion for system reset - used in set-top boxes and cable modems to prevent nuisance resets from front-panel switches.
For engineers reviewing the MAX6446UK31L+G65 datasheet, MAX6446UK31L+G65 pinout, MAX6446UK31L+G65 application, or MAX6446UK31L+G65 equivalent, key selection criteria include confirmed dual extended-setup MR inputs, 3.075V ±1.5% threshold at -40°C to +85°C, 6.72s tMR timing, 210ms typical reset timeout, and SOT23-5 open-drain output compatibility with 3.3V systems.
Technical Context
The MAX6446UK31L+G65 implements a precision bandgap-based voltage monitor for VCC with factory-trimmed 3.075V threshold (±1.5% over temperature) and 60ppm/°C tempco. Its dual manual reset architecture requires both MR1 and MR2 to be held low simultaneously for ≥6.72s before asserting RESET - eliminating false triggers from single-button presses.
RESET is an open-drain output guaranteed functional down to VCC = 1.0V, with VOL ≤ 0.3V at ISINK = 100µA and ILKG ≤ 1µA when deasserted. The device draws only 6µA typical supply current at 3.6V and operates across the full industrial temperature range (-40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.075V ±1.5% - precisely monitors 3.3V supply brownout with guaranteed hysteresis and 60ppm/°C stability |
| Manual Reset Setup Period (tMR) | 6.72s - prevents accidental reset from brief switch closures; requires simultaneous MR1+MR2 low |
| Reset Timeout Period (tRP) | 210ms typical - ensures µP reset pulse meets minimum hold-time requirements for reliable boot |
| Supply Current (ICC) | 6µA typical at 3.6V - enables always-on supervision in battery-backed or low-power embedded systems |
| Operating Temperature | -40°C to +85°C - fully specified for industrial and consumer equipment environments |
| Output Type | Open-drain RESET - allows level-shifting to different logic domains and supports wired-OR configurations |
| VCC Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout conditions |
Pinout & Package
MAX6446UK31L+G65 is housed in a 5-pin SOT23 package (package code U5+1), footprint-compatible with standard 5-lead SOT-23 land patterns (Maxim land pattern 90-0174). Pin 1 is GND; pin 2 is VCC; pin 3 is MR1; pin 4 is RESET; pin 5 is MR2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Common return path for all internal comparators and output driver; must be low-impedance |
| 2 - VCC | Supply voltage input | Primary monitored rail and power source; powers internal circuitry and defines logic thresholds |
| 3 - MR1 | Manual reset input 1 | Active-low input with 50kΩ internal pullup; must be held low with MR2 for ≥6.72s to trigger reset |
| 4 - RESET | Reset output | Open-drain active-low signal; requires external pullup (≥20kΩ to VCC) to drive µP reset pin |
| 5 - MR2 | Manual reset input 2 | Active-low input with 50kΩ internal pullup; dual-input assertion required - no immediate reset function |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended-setup manual reset inputs | MR1 and MR2 both require ≥6.72s low assertion - eliminates false resets from single-button operation |
| Precision 3.075V reset threshold | Factory-trimmed ±1.5% over -40°C to +85°C - ensures accurate 3.3V supply monitoring without external calibration |
| Ultra-low 6µA supply current | Enables permanent supervision in energy-constrained devices like remote controls and IoT endpoints |
| Valid RESET down to VCC = 1.0V | Guarantees clean reset assertion during deep brownout - critical for data integrity in flash write operations |
| Immunity to short transients | Rejects <20µs glitches at 100mV below threshold - prevents spurious resets from EMI or switching noise |
Applications
| Set-Top Box Power Management | Cable Modem System Recovery |
|---|---|
|
Use Scenario: Front-panel power button triggers system reset after prolonged press to recover from firmware hang. IC Role / Device Role / Timing Role: Supervisory IC asserts active-low RESET pulse only after simultaneous MR1+MR2 are held low for 6.72s - preventing accidental resets during normal channel navigation. Use Value: Eliminates need for external debounce circuitry while ensuring user-intended hard reset via deliberate dual-button or long-press action. |
Use Scenario: Remote firmware update failure causes modem lockup; technician initiates recovery via dedicated reset sequence. IC Role / Device Role / Timing Role: Dual MR inputs enforce intentional reset initiation - MR1 tied to front-panel switch, MR2 to service-mode jumper or secondary button. Use Value: Prevents unauthorized or accidental resets in deployed field units while enabling controlled recovery during maintenance. |
| DVD Player Brownout Protection | Industrial Control Panel Supervision |
|
Use Scenario: Mains voltage dip causes 3.3V rail to sag below 3.075V during disc spin-up; system must reset cleanly to avoid corrupted playback state. IC Role / Device Role / Timing Role: Monitors VCC directly; asserts RESET within 20µs of threshold breach and holds for 210ms to guarantee µP reset completion. Use Value: Ensures deterministic restart after brownout - avoids partial initialization and memory corruption common with marginal supply conditions. |
Use Scenario: HMI panel in factory automation requires fail-safe reset on power cycle and operator-initiated recovery. IC Role / Device Role / Timing Role: Provides both supply-monitoring reset (VCC) and secure manual reset (dual MR) - all guaranteed over -40°C to +85°C. Use Value: Meets IEC 61000-4-4 immunity requirements via transient rejection and delivers robust operation in thermally demanding enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6445UK31L+T | Same 3.075V threshold, same 6.72s tMR, but uses push-pull RESET instead of open-drain | Requires direct connection to µP reset pin without external pullup; incompatible with wired-OR or level-shifted reset buses | Select when system uses single-supply reset domain and no shared reset bus |
| MAX6446UK31S+T | Identical functionality and pinout, but with 3.36s manual reset setup period (S suffix vs L) | Lower user effort for reset initiation - suitable for consumer interfaces where 6.72s is perceived as overly long | Select when faster manual reset response is prioritized over maximum nuisance-reset immunity |
Compared with MAX6446UK31L+G65, the MAX6445UK31L+T offers push-pull output for simpler layout but sacrifices interface flexibility, while the MAX6446UK31S+T reduces reset initiation time by 50% at the cost of reduced immunity to brief switch contact bounce.
Availability
MAX6446UK31L+G65 is available at Aetrix Electronics and suitable for set-top boxes, cable modems, and industrial control panels requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6446UK31L+G65 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 - emphasizing reliability, low power, and high integration.
The MAX6443–MAX6452 family delivers robust µP supervision with extended manual reset timing, targeting applications where accidental resets must be eliminated - such as consumer entertainment systems and network infrastructure equipment.
FAQ
What is the exact reset threshold voltage of MAX6446UK31L+G65 and how is it trimmed?
The MAX6446UK31L+G65 has a factory-trimmed VCC reset threshold of 3.075V, with ±1.5% tolerance over the full -40°C to +85°C temperature range. This value is laser-trimmed during production to match the "31" suffix designation per Maxim's Table 1. The threshold exhibits 60ppm/°C tempco and includes built-in hysteresis of approximately 2×VTH mV to prevent chatter near the trip point. This precision eliminates need for external calibration in 3.3V system supervision.
Does MAX6446UK31L+G65 support immediate reset via MR2, or is it strictly dual-input?
MAX6446UK31L+G65 supports only dual-input extended-setup reset: both MR1 and MR2 must be held low simultaneously for the full 6.72s (L suffix) to assert RESET. Unlike MAX6447/MAX6448 or MAX6451/MAX6452, it does not implement an immediate-reset MR2 function. The MR2 pin on MAX6446UK31L+G65 is identical to MR1 - active-low, internally pulled up to VCC via 50kΩ, and requiring extended assertion. This design enforces deliberate reset initiation.
What is the recommended pullup resistor value for the open-drain RESET output of MAX6446UK31L+G65?
Maxim specifies a minimum 20kΩ pullup resistor to VCC for the open-drain RESET output of MAX6446UK31L+G65. A 47kΩ resistor is commonly used to balance speed (lower resistance) and power savings (higher resistance), especially in battery-powered systems. The pullup must connect to the same supply domain as the µP's reset pin - typically the monitored 3.3V rail. Values below 20kΩ risk exceeding VOL specification under sink conditions; values above 100kΩ may slow rise time beyond µP requirements.
Can MAX6446UK31L+G65 monitor a voltage other than VCC, such as a 1.8V core rail?
No - MAX6446UK31L+G65 is a single fixed-threshold supervisor (MAX6445/MAX6446 series) and monitors only the VCC pin. It does not include the RSTIN adjustable input found in MAX6449–MAX6452 variants. To supervise a 1.8V rail, you would need a different part (e.g., MAX6446UK18L+T with "18" suffix for 1.8V threshold) or an adjustable supervisor like MAX6452. The "31" suffix explicitly denotes 3.075V VCC monitoring and no secondary input capability.
Is MAX6446UK31L+G65 qualified for automotive applications?
No - MAX6446UK31L+G65 is rated for the industrial temperature range (-40°C to +85°C) and carries no AEC-Q100 qualification. While its operating range overlaps with automotive cabin environments, it lacks the stress testing, failure analysis, and documentation required for automotive use. For qualified alternatives, consider the MAX6444US16K/V+T (AEC-Q100 Grade 3) or other /V-suffixed parts in the same family - but note those have different pin count (SOT143), threshold, and reset input configuration.
MAX6446UK31L+G65 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- 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
MAX6446UK31L+G65 FAQ
1.How can I place an order for MAX6446UK31L+G65 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6446UK31L+G65 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 MAX6446UK31L+G65 reliable?
The price and inventory of MAX6446UK31L+G65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6446UK31L+G65 is usually 5 days.
3.What payment methods are accepted for MAX6446UK31L+G65?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6446UK31L+G65 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6446UK31L+G65?
MAX6446UK31L+G65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6446UK31L+G65 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 MAX6446UK31L+G65?
For technical support, including MAX6446UK31L+G65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6446UK31L+G65 requirements.
6.How does Aetrix verify that MAX6446UK31L+G65 is sourced from the original manufacturer or authorized distributors?
All MAX6446UK31L+G65 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 MAX6446UK31L+G65 meets industry standards.
7.What is the process for return or replacement of MAX6446UK31L+G65?
All MAX6446UK31L+G65 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6446UK31L+G65, 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 MAX6446UK31L+G65 part is unused and in its original packaging.
Return procedure for MAX6446UK31L+G65:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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