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Analog Devices Inc./Maxim Integrated MAX6445UK29L
- Part No.:
- MAX6445UK29L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6445UK29L.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
MAX6445UK29L from Maxim Integrated is a dual-manual-reset microprocessor supervisor IC with fixed 2.925V VCC reset threshold, two extended-setup manual reset inputs (MR1 and MR2), push-pull active-low RESET output, and guaranteed operation from VCC = 1.0V to 5.5V. It delivers 210ms typical reset timeout, 6µA supply current, and operates across –40°C to +85°C for use in set-top boxes and industrial equipment requiring robust brownout and nuisance-reset immunity.
For engineers reviewing the MAX6445UK29L datasheet, MAX6445UK29L pinout, MAX6445UK29L application, or MAX6445UK29L equivalent, key selection criteria include its dual extended-setup manual reset architecture (tMR = 6.72s), fixed 2.925V VCC monitoring, SOT23-5 package compatibility, and push-pull RESET logic - critical for reliable system initialization in consumer and embedded systems.
Technical Context
The MAX6445UK29L implements a precision voltage monitor with factory-trimmed 2.925V ±1.5% reset threshold on VCC and dual independent manual reset inputs (MR1 and MR2), both requiring simultaneous low assertion for ≥6.72s to trigger a one-shot RESET pulse. Its internal timing circuitry debounces MR transitions and guarantees valid RESET assertion down to VCC = 1.0V.
This device uses BiCMOS process technology to achieve ultra-low 6µA quiescent current while maintaining 60ppm/°C reset threshold tempco and 2.5mV hysteresis. The push-pull RESET output drives directly into µP reset inputs without external pull-up, supporting immediate deassertion and eliminating I²C-bus contention risks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±1.5% - precisely monitors 3.0V or 3.3V rails without external components |
| Reset Timeout Period | 140ms min / 210ms typ - ensures full µP initialization before release |
| Manual Reset Setup Period (tMR) | 6.72s - prevents accidental resets from brief front-panel switch closures |
| Supply Current (ICC) | 6µA typ at 3.6V - enables multi-year battery life in always-on monitoring applications |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up resistor and reduces BOM count |
| Temperature Range | –40°C to +85°C - qualified for industrial and automotive cabin environments |
Pinout & Package
MAX6445UK29L is housed in a 5-pin SOT23 package (package code U5-1, outline 21-0057), with gull-wing leads, 1.27mm pitch, and RoHS-compliant lead-free option (+T suffix). Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return path for all internal comparators and output driver; must be low-impedance connection to system ground plane |
| 2 VCC | Primary supply input | Monitored 2.925V rail input and power source for internal circuitry; supports operation down to 1.0V |
| 3 MR1 | Extended manual reset input 1 | Active-low input with 50kΩ internal pull-up; requires ≥6.72s low assertion to initiate RESET pulse |
| 4 MR2 | Extended manual reset input 2 | Active-low input with 50kΩ internal pull-up; both MR1 and MR2 must be held low simultaneously for ≥6.72s |
| 5 RESET | Active-low push-pull output | Drives µP reset pin directly; sinks 3.2mA at VCC ≥4.25V; no external pull-up required |
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 |
| Precision fixed reset threshold | 2.925V ±1.5% over –40°C to +85°C - eliminates calibration overhead for 3.0V/3.3V systems |
| Ultra-low supply current | 6µA typical - enables integration into battery-backed or energy-harvesting subsystems |
| Valid RESET down to VCC = 1.0V | Guaranteed logic state integrity during deep brownout - avoids undefined µP behavior |
| Push-pull RESET output | No external pull-up needed - simplifies layout, reduces component count, and improves noise immunity |
Applications
| Set-Top Box Power Management | Industrial HMI Panel Reset Control |
|---|---|
|
Use Scenario: Front-panel power button triggers system reset only after sustained press to avoid accidental shutdown during normal navigation. IC Role / Device Role / Timing Role: MAX6445UK29L supervises 3.3V main rail and interprets dual-button press (MR1+MR2) as intentional hard reset. Use Value: 6.72s setup period eliminates nuisance resets while enabling field-service recovery without opening enclosure. |
Use Scenario: Human-machine interface panel requires deterministic reset after firmware update or watchdog timeout. IC Role / Device Role / Timing Role: MAX6445UK29L monitors VCC and asserts 210ms RESET pulse to restart ARM Cortex-M4 controller upon detected brownout. Use Value: Push-pull output ensures clean, fast-rising RESET edge compatible with µP's minimum pulse-width requirement. |
| Consumer Audio Device Brownout Protection | Medical Diagnostic Instrument Supervision |
|
Use Scenario: Portable ultrasound scanner maintains stable operation during battery voltage sag between charging cycles. IC Role / Device Role / Timing Role: MAX6445UK29L detects VCC drop below 2.925V and holds µP in reset until rail recovers and stabilizes for 210ms. Use Value: 60ppm/°C tempco ensures threshold stability across operating temperature range, preventing false resets. |
Use Scenario: Lab-grade ECG analyzer requires fail-safe reset during AC power interruption or backup battery switchover. IC Role / Device Role / Timing Role: MAX6445UK29L provides redundant reset control via dual MR inputs - one for service technician, one for automated self-test. Use Value: Guaranteed operation down to VCC = 1.0V ensures reset validity through entire power collapse event. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6446UK29L | Identical electrical specs but open-drain RESET output instead of push-pull | Requires external pull-up resistor; suitable when interfacing to mixed-voltage µP reset inputs | Select MAX6446UK29L only if level-shifting or multi-drop reset bus is required |
| TPS3808G33DBVR | Single manual reset input, 3.08V threshold (±0.5%), 200ms timeout, 1.2µA ICC | Lacks dual MR architecture and extended setup period; lower quiescent current but no nuisance-reset immunity | Choose TPS3808G33DBVR for space-constrained designs where single-button reset suffices and ultra-low ICC is critical |
Compared with MAX6446UK29L, MAX6445UK29L eliminates external pull-up components and simplifies PCB routing; versus TPS3808G33DBVR, it trades 5.4µA higher ICC for robust dual-button reset security and field-serviceability in safety-critical systems.
Availability
MAX6445UK29L is available at Aetrix Electronics and suitable for set-top boxes, industrial HMIs, portable medical devices, and consumer audio equipment requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6445UK29L 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX6443–MAX6452 family was designed specifically for microprocessor supervision in noise-prone environments, emphasizing extended manual reset setup periods, ultra-low power, and guaranteed reset validity during brownout - addressing reliability gaps in consumer and industrial embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6445UK29L?
The MAX6445UK29L has a factory-trimmed VCC reset threshold of 2.925V with ±1.5% tolerance over –40°C to +85°C. This value is confirmed in Table 1 of the datasheet and corresponds to the "29" suffix in the part number. The threshold remains stable with 60ppm/°C tempco, making it suitable for 3.0V and 3.3V supply monitoring without calibration.
Does the MAX6445UK29L require an external pull-up resistor on the RESET pin?
No, the MAX6445UK29L features a push-pull RESET output, so no external pull-up resistor is required. The output actively drives high and low, ensuring fast, clean edges compatible with modern µP reset inputs. This differs from open-drain variants like MAX6446UK29L, which do require a pull-up.
How does the dual manual reset function work on the MAX6445UK29L?
The MAX6445UK29L requires both MR1 and MR2 inputs to be held low simultaneously for the full 6.72s ('L' suffix) extended setup period before asserting RESET. This dual-input requirement prevents accidental resets from single-switch closures and is ideal for service-mode activation or secure recovery sequences in consumer and industrial systems.
Can the MAX6445UK29L operate reliably when VCC drops below 1.5V?
Yes - the MAX6445UK29L guarantees valid RESET output logic down to VCC = 1.0V, as specified in the Electrical Characteristics table. At 1.0V, it still sinks 50µA with VOL ≤ 0.3V, ensuring µP reset pin remains asserted during deep brownout events common in battery-powered applications.
What package type and dimensions does the MAX6445UK29L use?
The MAX6445UK29L is supplied in a 5-pin SOT23 package (outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm with 1.27mm lead pitch. It uses gull-wing leads and is available in both leaded (–T) and RoHS-compliant lead-free (+T) versions, with top-mark "AEEI" per Table 3.
MAX6445UK29L 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6445UK29L FAQ
1.How can I place an order for MAX6445UK29L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6445UK29L 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 MAX6445UK29L reliable?
The price and inventory of MAX6445UK29L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6445UK29L is usually 5 days.
3.What payment methods are accepted for MAX6445UK29L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6445UK29L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6445UK29L?
MAX6445UK29L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6445UK29L 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 MAX6445UK29L?
For technical support, including MAX6445UK29L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6445UK29L requirements.
6.How does Aetrix verify that MAX6445UK29L is sourced from the original manufacturer or authorized distributors?
All MAX6445UK29L 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 MAX6445UK29L meets industry standards.
7.What is the process for return or replacement of MAX6445UK29L?
All MAX6445UK29L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6445UK29L, 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 MAX6445UK29L part is unused and in its original packaging.
Return procedure for MAX6445UK29L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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