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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:2,061
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Product details
Overview
MAX6447UK29L from Maxim Integrated is a single-supply, dual-manual-reset microprocessor supervisor IC with one extended-setup (MR1) and one immediate-assertion (MR2) reset input, 2.925V fixed VCC reset threshold, 6.72s MR1 setup period, 140ms min reset timeout, and push-pull active-low RESET output in 5-pin SOT23 package. It ensures reliable system initialization in consumer electronics requiring immunity to switch bounce and transient-induced false resets.
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), guaranteed reset validity down to VCC = 1.0V, low 6µA supply current, factory-trimmed 2.925V threshold with ±12.5mV accuracy, and AEC-Q100-qualified variants for automotive use.
Technical Context
The MAX6447UK29L implements a precision bandgap-based voltage monitor for VCC with 2.925V threshold and 60ppm/°C tempco, paired with two independent manual reset inputs: MR1 requires a sustained 6.72s low pulse (L-suffix) to trigger a one-shot 210ms typ reset pulse, while MR2 responds immediately to a rising edge with debounced assertion and 210ms deassertion hold time.
Its push-pull RESET output drives low with ≤0.3V at 1.2V VCC/100µA sink, remains valid across -40°C to +85°C, and features internal 50kΩ pullups on both MR1 and MR2 - enabling direct connection to mechanical switches without external components, while rejecting transients <100ns and glitches <20µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V ±12.5mV - precisely monitors 3.3V rail brownout with factory-trimmed accuracy |
| MR1 Setup Period | 6.72s - prevents nuisance resets from brief front-panel button presses |
| Reset Timeout Period | 140ms min / 210ms typ - ensures full µP reset sequence completion before release |
| Supply Current | 6µA typ at 3.6V - enables always-on supervision in battery-backed systems |
| VCC Operating Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor in most µP interfaces |
| Temp Range | -40°C to +85°C - fully specified for industrial and automotive cabin environments |
Pinout & Package
Package: 5-pin SOT23 (U5+1), 2.9mm × 1.6mm footprint, lead(Pb)-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output driver |
| 2 | VCC | Main power supply input and monitored voltage source for primary reset function |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup; requires ≥6.72s low pulse to assert RESET |
| 4 | RESET | Active-low push-pull output; sinks current to force µP into known reset state |
| 5 | MR2 | Active-low manual reset input with internal 50kΩ pullup; rising-edge triggered for immediate one-shot RESET pulse |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset | MR1 (6.72s extended setup) + MR2 (immediate rising-edge trigger) enables both deliberate system reset and smart-card detect functionality |
| Glitch-immune monitoring | Rejects transients <100ns and <20µs at 100mV overdrive - prevents false resets from ESD or switching noise |
| Low-voltage reset guarantee | Valid RESET assertion down to VCC = 1.0V - ensures robust operation during deep brownout conditions |
| Factory-trimmed threshold | 2.925V ±12.5mV (±0.43%) - eliminates need for external calibration in 3.3V systems |
| Zero-external-component interface | Internal 50kΩ MR1/MR2 pullups and push-pull RESET - reduces BOM count and PCB area vs. open-drain alternatives |
Applications
| Set-Top Box Power Management | DVD Player System Reset |
|---|---|
Use Scenario: Front-panel power button initiates soft interrupt if pressed briefly, hard reset if held >6.72s; MR2 detects tray-open event for immediate firmware reinitialization. IC Role / Device Role / Timing Role: Dual-mode supervisor providing deterministic reset timing, brownout detection on 3.3V rail, and hardware-level debounce for mechanical switches. Use Value: Eliminates software-based debounce logic, reduces µP wake-up latency by 15ms vs. polling-based detection, and prevents accidental reset during normal UI navigation. | Use Scenario: Power-on sequence requires stable 3.3V rail before DVD controller initialization; MR2 tied to disc-motor enable signal triggers immediate reset on motor stall detection. IC Role / Device Role / Timing Role: Primary VCC supervisor with precise 2.925V threshold and immediate MR2 response for fault-driven recovery. Use Value: Guarantees controller reset within 200ns of MR2 rising edge, avoids corrupted disc read operations, and extends motor driver lifetime via timely fault shutdown. |
| Cable Modem Firmware Recovery | Industrial HMI Panel Reset |
Use Scenario: Remote firmware update failure triggers watchdog timeout; MR1 activated via GPIO-controlled FET to initiate controlled 6.72s reset sequence ensuring flash memory integrity. IC Role / Device Role / Timing Role: Hardware-enforced reset coordination between communication processor and baseband IC during recovery mode. Use Value: Prevents partial flash writes by enforcing minimum 140ms reset hold time, reduces field return rate by 22% in deployed units. | Use Scenario: Touchscreen panel exposed to ESD events; MR2 connected to chassis ground sense line asserts RESET on transient coupling, while VCC monitor guards against 24V-to-3.3V converter dropout. IC Role / Device Role / Timing Role: Dual-fault detector combining supply monitoring and fast transient response for harsh industrial environments. Use Value: Survives 8kV contact ESD per IEC 61000-4-2 without latch-up, maintains reset assertion for full 210ms after transient decay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6448UK29L | Same pinout and electrical specs, but open-drain RESET output requiring external pullup | Suitable where level-shifting to different logic families (e.g., 1.8V µP) is needed | Select when interfacing to non-3.3V reset inputs or when shared bus reset signaling is required |
| TPS3808G33DBVR | Single manual reset input only; 3.08V threshold (±0.5%); 200ms timeout; 1.8–6V VCC range | Lacks MR2 immediate-trigger capability; optimized for cost-sensitive single-button systems | Choose for simpler designs without smart-card or dual-reset requirements and where tighter threshold tolerance is critical |
Compared with MAX6447UK29L, MAX6448UK29L trades push-pull convenience for level-shift flexibility, while TPS3808G33DBVR offers higher threshold accuracy and wider VCC range but omits the immediate MR2 path essential for real-time fault response in smart-card or motor-control applications.
Availability
MAX6447UK29L is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable modems, and industrial HMIs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants for automotive integration.
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 high-reliability, low-power solutions.
The MAX6443–MAX6452 family delivers microprocessor supervisors with extended manual reset setup periods for consumer, industrial, and automotive systems where mechanical switch bounce and transient immunity are critical design constraints.
FAQ
What is the exact reset threshold voltage of the MAX6447UK29L and how tightly is it specified?
The MAX6447UK29L has a factory-trimmed VCC reset threshold of 2.925V, with a guaranteed tolerance of ±12.5mV (±0.43%) over temperature. This specification is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" for suffix "29", and applies across the full -40°C to +85°C operating range with 60ppm/°C tempco. The MAX6447UK29L uses laser-trimmed resistors to achieve this precision without external components.
How does the MR2 input on the MAX6447UK29L differ from MR1, and what is its debounce behavior?
The MR2 input on the MAX6447UK29L responds to a rising edge with immediate one-shot RESET assertion (140ms min timeout), unlike MR1 which requires a sustained 6.72s low pulse. MR2 features 210ms internal deassertion debouncing - meaning a high-to-low transition on MR2 will not cause RESET deassertion until 210ms after the falling edge, preventing false releases from contact bounce. This behavior is explicitly documented in the Applications Information section for smart-card detect use cases.
Can the MAX6447UK29L operate reliably when VCC drops below 1.0V, and what happens to the RESET output?
The MAX6447UK29L guarantees valid RESET output logic only down to VCC = 1.0V; below this, current-sinking capability declines rapidly and RESET may float. The datasheet states RESET is "guaranteed valid down to VCC = 1.0V" and notes that for operation down to 0V, an external pulldown resistor is required - but only for push-pull versions like the MAX6447UK29L (not open-drain). No internal circuitry supports sub-1.0V operation.
What package type and pin configuration does the MAX6447UK29L use, and is it RoHS compliant?
The MAX6447UK29L uses a 5-pin SOT23 package (package code U5+1, outline 21-0057), with pin 1 = GND, pin 2 = VCC, pin 3 = MR1, pin 4 = RESET, pin 5 = MR2. It is lead(Pb)-free and RoHS compliant, as indicated by the "+T" suffix in the ordering information and confirmed in the Package Information section. Land pattern #90-0174 applies for PCB layout.
Does the MAX6447UK29L support adjustable reset thresholds, and can it monitor voltages other than VCC?
No, the MAX6447UK29L does not support adjustable thresholds or external voltage monitoring. It is a single-fixed-threshold device (2.925V) monitoring only the VCC pin. Adjustable RSTIN functionality is exclusive to the MAX6449–MAX6452 variants (6-pin SOT23), as clearly stated in the General Description and Selector Guide tables - the MAX6447UK29L lacks the RSTIN pin entirely.
MAX6447UK29L 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:
- 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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