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Analog Devices Inc./Maxim Integrated MAX6447UK29L+
- Part No.:
- MAX6447UK29L+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6447UK29L+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
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Product details
Overview
MAX6447UK29L+ from Maxim Integrated is a precision single-supply microprocessor reset supervisor IC with dual manual reset inputs - one extended-setup (MR1, 6.72s typical) and one immediate-assertion (MR2, edge-triggered) - monitoring VCC at a factory-set 2.925V threshold. It delivers active-low push-pull RESET with 140ms minimum timeout, 6µA supply current, and guaranteed operation down to VCC = 1.0V. Used in set-top boxes and industrial equipment for reliable power-on reset and smart-card detect.
For engineers reviewing the MAX6447UK29L+ datasheet, MAX6447UK29L+ pinout, MAX6447UK29L+ application, or MAX6447UK29L+ equivalent, key selection criteria include its dual-mode manual reset architecture (extended + immediate), fixed 2.925V VCC threshold, SOT23-5 package, push-pull output, and -40°C to +85°C temperature guarantee.
Technical Context
The MAX6447UK29L+ integrates two distinct manual reset paths: MR1 requires sustained low assertion for 6.72s (L-suffix) to trigger a one-shot 140ms RESET pulse, while MR2 responds to a rising-edge transition with immediate 140ms pulse assertion and 210ms debouncing on deassertion. Its internal 50kΩ pullup on MR1 enables direct front-panel switch interfacing without external components.
VCC monitoring uses a precision bandgap reference with ±0.5% threshold accuracy (2.925V ±15mV), 60ppm/°C tempco, and hysteresis of ~2×VTH. The push-pull RESET output drives low to ≤0.3V at 1.2V VCC/100µA sink, ensuring robust logic-level compatibility across low-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 2.925V ±15mV - precise brownout detection point for 3.0V nominal rails |
| Reset Timeout | 140ms min - ensures full µP initialization before release |
| MR1 Setup Time | 6.72s typ - prevents nuisance resets from brief button presses |
| MR2 Response | Rising-edge triggered - enables instant system test or card-insertion detection |
| Supply Current | 6µA at 3.6V - ultra-low power for battery-backed or always-on systems |
| Operating Range | VCC = 1.0V to 5.5V - valid reset assertion even during deep brownout |
| Output Type | Active-low push-pull - no external pullup required; drives directly to µP reset pin |
Pinout & Package
MAX6447UK29L+ is housed in a 5-pin SOT23 package (U5+1 outline), footprint-compatible with industry-standard 5-lead SOT-23 layouts and suitable for high-density PCB designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 2 VCC | Power supply input | Primary monitored voltage rail; powers internal comparators and logic; valid from 1.0V to 5.5V |
| 3 MR1 | Extended manual reset input | Active-low input with internal 50kΩ pullup; requires ≥6.72s low assertion to trigger RESET |
| 4 RESET | Active-low push-pull output | Drives µP reset pin directly; sinks ≤0.3V at 100µA; no external pullup needed |
| 5 MR2 | Immediate manual reset input | Edge-triggered input; rising edge pulses RESET for 140ms; debounced 210ms on falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset | Combines long-hold (MR1) and edge-triggered (MR2) inputs for both user-initiated hard reset and automatic event detection (e.g., smart-card insertion) |
| Precision 2.925V threshold | ±0.5% accuracy over -40°C to +85°C ensures consistent brownout response on 3.0V systems |
| 6µA quiescent current | Enables use in energy-sensitive applications such as remote sensors or battery-powered consumer devices |
| Guaranteed RESET at VCC ≥ 1.0V | Ensures deterministic reset behavior during power ramp-down, preventing undefined µP states |
| Push-pull output | Eliminates need for external pullup resistor, reducing BOM count and layout complexity |
Applications
| Set-Top Box Power Management | Industrial HMI Panel Reset |
|---|---|
Use Scenario: Front-panel power button press initiates controlled system boot or recovery sequence. IC Role / Device Role / Timing Role: MAX6447UK29L+ monitors 3.3V rail and provides dual-reset capability: MR1 for deliberate long-press hard reset, MR2 for quick diagnostic reset via service button. Use Value: Prevents accidental resets during normal operation while enabling rapid technician intervention without firmware changes. | Use Scenario: Operator panel with physical buttons and embedded controller requires reliable power-up sequencing and field-service reset. IC Role / Device Role / Timing Role: MAX6447UK29L+ supervises main 3.0V supply and interfaces to two mechanical switches - one for user reset (MR1), one for maintenance mode entry (MR2). Use Value: Eliminates need for external debounce circuitry; 6.72s MR1 hold time avoids spurious resets from vibration or contact bounce. |
| Smart Card Reader Interface | DVD Player System Recovery |
Use Scenario: Detection of smart card insertion/removal triggers immediate system reinitialization. IC Role / Device Role / Timing Role: MAX6447UK29L+ uses MR2 as card-detect input (rising edge on card insertion); MR1 serves as fallback hardware reset. Use Value: 210ms MR2 deassertion debounce prevents false resets during card removal transients; no µP polling required. | Use Scenario: Consumer DVD player recovers from corrupted state after power interruption or software hang. IC Role / Device Role / Timing Role: MAX6447UK29L+ monitors 3.3V VCC and provides 140ms RESET pulse upon MR1 activation; push-pull output ensures clean reset edge into µP. Use Value: Fixed 2.925V threshold aligns with 3.0V rail tolerance; 6µA ICC minimizes standby power draw in always-on standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6447UK29S+ | Same 2.925V threshold and dual MR architecture, but MR1 setup period reduced to 3.36s (S-suffix) | Better suited for applications requiring faster user-accessible reset (e.g., portable media players) | Select when shorter manual reset hold time improves UX without compromising nuisance immunity |
| MAX6448UK29L+ | Identical electrical specs and pinout, but open-drain RESET output instead of push-pull | Required where level-shifting or wired-OR reset bus configuration is needed | Choose only if system design mandates open-drain topology; otherwise MAX6447UK29L+ reduces component count |
Compared with MAX6447UK29S+, MAX6447UK29L+ offers longer MR1 immunity to accidental presses; compared with MAX6448UK29L+, it eliminates the need for an external pullup resistor, simplifying layout and improving noise margin on the RESET line.
Availability
MAX6447UK29L+ is available at Aetrix Electronics and suitable for set-top boxes, industrial HMIs, smart card readers, and DVD players requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6447UK29L+ 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, with emphasis on reliability and low-power operation.
The MAX6443–MAX6452 family was developed to address demand for robust, low-current µP supervisors with configurable manual reset behavior - specifically targeting consumer, industrial, and automotive systems needing immunity to transient glitches and flexible human-interface reset schemes.
FAQ
What is the exact VCC reset threshold voltage for MAX6447UK29L+?
The MAX6447UK29L+ has a factory-trimmed VCC reset threshold of 2.925V, with guaranteed limits of 2.85V (min) and 3.00V (max) over the full -40°C to +85°C temperature range. This value is encoded in the "29" suffix per Maxim's ordering nomenclature and confirmed in the Electrical Characteristics table under VTH for the 29 option.
Does MAX6447UK29L+ support operation below 1.8V VCC?
Yes, MAX6447UK29L+ is fully specified down to VCC = 1.0V, with guaranteed RESET assertion and valid logic levels. At VCC = 1.0V, the RESET output sinks ≤0.3V at 50µA, and supply current remains at 7µA (typ). Operation below 1.0V is not characterized, and RESET behavior becomes indeterminate.
How does the MR2 input on MAX6447UK29L+ differ from MR1?
MR1 on MAX6447UK29L+ is an extended-setup input requiring ≥6.72s low assertion to trigger RESET; MR2 is edge-triggered - a rising edge immediately asserts RESET for 140ms, with 210ms internal debouncing on the falling edge to prevent false triggers during card removal or switch bounce.
Is MAX6447UK29L+ pin-compatible with other parts in the MAX6443–MAX6452 family?
MAX6447UK29L+ uses the 5-pin SOT23 package and shares identical pinout with MAX6445, MAX6446, MAX6447, and MAX6448. However, functional differences exist: MAX6445/MAX6446 have two extended MR inputs; MAX6448 has open-drain RESET; MAX6447UK29L+ is unique in combining MR1 (extended) + MR2 (immediate) with push-pull RESET.
What is the purpose of the 50kΩ internal pullup on MR1 of MAX6447UK29L+?
The 50kΩ internal pullup on MR1 of MAX6447UK29L+ allows direct connection of a simple SPST front-panel switch to ground without external components. When the switch opens, MR1 returns high within microseconds; when closed, it pulls MR1 low for the required 6.72s setup period - enabling cost-effective, space-efficient mechanical reset integration.
MAX6447UK29L+ 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:
- 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-23-5
MAX6447UK29L+ FAQ
1.How can I place an order for MAX6447UK29L+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6447UK29L+ 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 MAX6447UK29L+ reliable?
The price and inventory of MAX6447UK29L+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6447UK29L+ is usually 5 days.
3.What payment methods are accepted for MAX6447UK29L+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6447UK29L+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6447UK29L+?
MAX6447UK29L+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6447UK29L+ 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 MAX6447UK29L+?
For technical support, including MAX6447UK29L+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6447UK29L+ requirements.
6.How does Aetrix verify that MAX6447UK29L+ is sourced from the original manufacturer or authorized distributors?
All MAX6447UK29L+ 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 MAX6447UK29L+ meets industry standards.
7.What is the process for return or replacement of MAX6447UK29L+?
All MAX6447UK29L+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6447UK29L+, 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 MAX6447UK29L+ part is unused and in its original packaging.
Return procedure for MAX6447UK29L+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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