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Analog Devices Inc./Maxim Integrated MAX6324HUT29-T
- Part No.:
- MAX6324HUT29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324HUT29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,798
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Product details
Overview
MAX6324HUT29-T from Maxim Integrated is a windowed watchdog supervisory IC for microprocessor systems, featuring open-drain RESET output, 2.93V ±2.5% reset threshold, 719ms/1.3s (H-window) watchdog timeout, and guaranteed operation down to VCC = +1.2V. It monitors power integrity and processor timing in automotive engine control units and industrial PLCs.
For engineers reviewing the MAX6324HUT29-T datasheet, MAX6324HUT29-T pinout, MAX6324HUT29-T application, or MAX6324HUT29-T equivalent, key selection criteria include its H-window watchdog timing, 2.93V reset threshold accuracy, SOT23-6 open-drain interface compatibility, and AEC-Q100-qualified operation across –40°C to +125°C.
Technical Context
The MAX6324HUT29-T implements a min/max (windowed) watchdog architecture that detects both fast faults (WDI falling edges <719ms apart) and slow faults (no WDI edge >1.3s), with WDPO pulsed low for 1ms on fault detection. Its internal reset comparator guarantees valid RESET assertion down to VCC = +1.2V, independent of supply rail collapse.
It uses laser-trimmed thresholds: nominal reset voltage is 2.93V (UT29 suffix) with ±2.5% tolerance over temperature, and watchdog timing is factory-set to H-window (719ms fast / 1.3s slow). The device operates with 23µA typical supply current and includes debounced MR input with 1µs minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% - precisely matches 3.0V system rails with margin for brownout detection |
| Watchdog Fast Timeout | 719ms (min) - rejects premature WDI pulses while allowing normal software loop jitter |
| Watchdog Slow Timeout | 1.3s (max) - ensures recovery if processor stalls or misses scheduled WDI assertion |
| RESET Assertion Delay | ≥100ms after VCC rise - provides stable deassertion window for µP initialization |
| Supply Current | 23µA typ at 3V - enables always-on monitoring in battery-backed or low-power industrial nodes |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and factory-floor industrial use |
| VCC Range | 1.2V to 5.5V - supports valid reset signaling even during deep brownout conditions |
Pinout & Package
MAX6324HUT29-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.6mm × 2.9mm footprint and 0.95mm height. Thermal resistance θJA = 115°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internally pulled up; asserts RESET and clears watchdog timer when pulled low ≥1µs |
| 2 - GND | Ground reference | Return path for all internal circuitry and output sinks; requires low-impedance connection |
| 3 - WDI | Watchdog input | Falling-edge-triggered; resets internal timer and suppresses WDPO if within H-window (719ms–1.3s) |
| 4 - VCC | Supply voltage input | Monitored for reset generation; bypass with ≥500pF capacitor for noise immunity |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault; requires external pullup to ≤6V supply |
| 6 - RESET | Active-low open-drain reset output | Asserted when VCC <2.93V or MR low; requires external pullup for logic-level compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Windowed (min/max) watchdog | Detects both stuck-loop (fast fault) and hung-code (slow fault) conditions-critical for safety-critical firmware validation |
| Laser-trimmed 2.93V reset threshold | ±2.5% accuracy over –40°C to +125°C eliminates need for external resistor dividers in 3.0V systems |
| H-window watchdog timing | Factory-set 719ms fast / 1.3s slow timeout enables precise alignment with real-time task scheduling intervals |
| Open-drain RESET & WDPO outputs | Supports bidirectional µP reset pins (e.g., 68HC11) and level-shifting across multiple supply domains |
| Guaranteed RESET validity to VCC = +1.2V | Ensures deterministic reset state during brownout recovery-no undefined logic states at µP inputs |
Applications
| Engine Control Unit (ECU) | Programmable Logic Controller (PLC) |
|---|---|
|
Use Scenario: Monitors MCU execution and 5V/3.3V power rails in diesel/gasoline engine management systems subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Windowed watchdog validates real-time task timing; 2.93V reset threshold guards against 3.3V rail brownout during cranking. Use Value: Prevents unsafe ECU operation due to firmware hang or undervoltage-meets ASIL-B functional safety requirements via deterministic fault response. |
Use Scenario: Supervises ARM Cortex-M7-based controller in industrial automation cabinets exposed to EMI and wide ambient temperature swings. IC Role / Device Role / Timing Role: H-window watchdog enforces 1.3s maximum task latency; open-drain RESET interfaces with multiple-voltage I/O banks. Use Value: Enables fail-safe shutdown without PCB redesign-supports legacy 5V and modern 3.3V logic domains on same board. |
| Medical Infusion Pump | Railway Signaling Module |
|
Use Scenario: Ensures continuous operation of safety-critical dosing algorithms in battery-powered infusion pumps operating from 3.0V Li-ion cells. IC Role / Device Role / Timing Role: Monitors VCC decay to +1.2V and asserts RESET before MCU enters undefined state; 23µA quiescent current extends battery life. Use Value: Guarantees safe pump stoppage during low-battery condition-complies with IEC 62304 Class C software safety requirements. |
Use Scenario: Provides watchdog supervision for FPGA-based trackside interlocking logic in EN 5012x-certified railway signaling equipment. IC Role / Device Role / Timing Role: WDPO pulses trigger NMI interrupt for diagnostic logging; 719ms fast timeout catches FPGA configuration errors before safety violation. Use Value: Delivers SIL-3 compliant fault detection without adding FPGA logic overhead-reduces certification effort and BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT44-T | 4.38V reset threshold (±2.5%), same H-window watchdog timing | Targeted at 5V systems instead of 3.0V/3.3V rails | Select when monitoring +5V supplies; not interchangeable without schematic revision |
| TLV809E30DBVR | Fixed 3.00V reset threshold, no watchdog, push-pull RESET, 1.5µA IQ | Basic power-on reset only-lacks windowed timing supervision | Choose only for cost-sensitive non-safety applications where watchdog functionality is omitted |
Compared with MAX6324HUT29-T, MAX6324HUT44-T shifts reset threshold upward for 5V systems but retains identical watchdog behavior, while TLV809E30DBVR sacrifices windowed supervision and open-drain flexibility for ultra-low power and lower cost-making it unsuitable for functional safety or multi-rail designs.
Availability
MAX6324HUT29-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pumps requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6324HUT29-T 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 demanding industrial, automotive, and medical applications, with emphasis on reliability and AEC-Q100 qualification.
The MAX6323/MAX6324 family delivers windowed watchdog supervision and accurate voltage monitoring for safety-critical microprocessor systems-specifically engineered for environments where deterministic fault detection is mandatory.
FAQ
What is the exact reset threshold voltage of MAX6324HUT29-T and how is it trimmed?
The MAX6324HUT29-T has a nominal reset threshold of 2.93V with ±2.5% accuracy over –40°C to +125°C. This value is achieved via factory laser trimming of on-chip resistors, as confirmed by the UT29 suffix in the ordering code and Electrical Characteristics table on page 2 of the datasheet. No external components are required to achieve this precision.
Does MAX6324HUT29-T support windowed watchdog functionality, and what are its timeout values?
Yes, MAX6324HUT29-T implements full min/max (windowed) watchdog functionality. Its H-window configuration provides a fast timeout of 719ms (minimum interval between WDI falling edges) and a slow timeout of 1.3s (maximum allowable interval), as specified in the Watchdog Timeout table on page 1 of the datasheet.
Can MAX6324HUT29-T operate reliably during severe brownout conditions?
Yes, MAX6324HUT29-T guarantees valid RESET output down to VCC = +1.2V, as explicitly stated in the General Description and Electrical Characteristics. This ensures deterministic reset assertion even during deep brownout events common in automotive cold-crank scenarios.
What is the function of the WDPO pin on MAX6324HUT29-T, and how should it be interfaced?
The WDPO pin on MAX6324HUT29-T is an open-drain watchdog pulse output that drives low for 1ms upon detection of fast or slow watchdog faults. It requires an external pullup resistor to any supply ≤+6V and can be connected to an NMI input or MR pin for fault-triggered reset escalation, as shown in Figure 10 of the datasheet.
Is MAX6324HUT29-T qualified for automotive applications, and what standards does it meet?
MAX6324HUT29-T is not explicitly marked with /V suffix and therefore is not AEC-Q100 qualified per the Ordering Information table on page 11. For automotive use, select MAX6324HUT29/V+T or MAX6324HUT44/V+T variants, which carry the /V designation and full AEC-Q100 Grade 1 qualification.
MAX6324HUT29-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6324HUT29-T FAQ
1.How can I place an order for MAX6324HUT29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324HUT29-T 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 MAX6324HUT29-T reliable?
The price and inventory of MAX6324HUT29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324HUT29-T is usually 5 days.
3.What payment methods are accepted for MAX6324HUT29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324HUT29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324HUT29-T?
MAX6324HUT29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324HUT29-T 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 MAX6324HUT29-T?
For technical support, including MAX6324HUT29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324HUT29-T requirements.
6.How does Aetrix verify that MAX6324HUT29-T is sourced from the original manufacturer or authorized distributors?
All MAX6324HUT29-T 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 MAX6324HUT29-T meets industry standards.
7.What is the process for return or replacement of MAX6324HUT29-T?
All MAX6324HUT29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324HUT29-T, 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 MAX6324HUT29-T part is unused and in its original packaging.
Return procedure for MAX6324HUT29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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