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Analog Devices Inc./Maxim Integrated MAX6324EUT29+T
- Part No.:
- MAX6324EUT29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324EUT29+T.pdf
- Description:
- IC SUPERVISOR 2.93V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
MAX6324EUT29+T from Maxim Integrated is an open-drain microprocessor supervisory circuit with windowed (min/max) watchdog, 2.93V ±2.5% reset threshold, 100ms minimum reset timeout, and guaranteed RESET validity down to VCC = +1.2V. It monitors +2.5V/+3.3V systems in automotive engine control units where deterministic fault detection and brownout immunity are critical.
For engineers reviewing the MAX6324EUT29+T datasheet, MAX6324EUT29+T pinout, MAX6324EUT29+T application, or MAX6324EUT29+T equivalent, key selection criteria include its factory-trimmed 719ms/1.3s slow/fast watchdog timeout pair, SOT23-6 open-drain RESET output, -40°C to +125°C operation, and AEC-Q100-compliant variants for safety-critical embedded control.
Technical Context
The MAX6324EUT29+T implements a dual-window watchdog 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 reset comparator guarantees monotonic behavior across temperature with ±2.5% accuracy over -40°C to +125°C.
VCC monitoring operates from 1.2V to 5.5V with 23µA typical supply current; the open-drain RESET output requires an external pullup and remains valid down to VCC = +1.2V, while MR input includes internal 85kΩ pullup and 100ns glitch immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% - precisely matches +3.0V supply rails with guaranteed trip point across full temperature range |
| Watchdog Timeout (Fast) | 719ms min - detects premature WDI pulses indicating runaway loops or clock faults |
| Watchdog Timeout (Slow) | 1.3s max - identifies stalled execution or missed WDI pulses in time-critical firmware |
| Reset Timeout Delay | 100ms min - ensures µP completes power-up initialization before release from reset |
| Supply Current | 23µA typ at 3V - enables always-on supervision in battery-backed or low-power industrial nodes |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
| VCC Range | 1.2V to 5.5V - supports supervision of legacy 5V, modern 3.3V, and emerging low-voltage µPs |
Pinout & Package
MAX6324EUT29+T is housed in a 6-pin SOT23 package (package code U6+1A), footprint-compatible with JEDEC MO-178AA, 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 to VCC; asserts RESET and clears watchdog timer when low ≥1µs; immune to 100ns glitches |
| 2 GND | Ground reference | Primary return path for VCC, RESET, WDPO, and WDI; must be low-impedance connection to system ground plane |
| 3 WDI | Watchdog input | Falling-edge triggered; resets internal timer window; requires ≥300ns pulse width; rejects <100ns noise |
| 4 VCC | Supply voltage input | Monitored rail; bypass with ≥500pF capacitor near pin; functional down to +1.2V for valid RESET assertion |
| 5 WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault detection; requires external pullup to ≤+6V; inactive during RESET assertion |
| 6 RESET | Active-low open-drain reset output | Asserted when VCC <2.93V or MR low; held ≥100ms after recovery; requires external pullup for logic-high level shifting |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Dual-timing detection (719ms/1.3s) prevents false triggers from transient software stalls while catching hard hangs |
| Guaranteed RESET down to VCC = +1.2V | Ensures deterministic reset state even during deep brownout conditions common in automotive cranking |
| Debounced MR input | Eliminates need for external RC network; internal 85kΩ pullup and 1µs minimum pulse requirement simplify front-panel reset design |
| Open-drain RESET & WDPO | Enables bidirectional reset interfacing (e.g., Motorola 68HC11) and level-shifting across multiple supply domains |
| AEC-Q100 qualification path | MAX6324HUT44/V+T variant certified; MAX6324EUT29+T shares identical process, package, and test flow for automotive program adoption |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply during cold cranking when battery voltage dips to 6V–9V. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and windowed watchdog for ASIL-B compliant firmware execution. Use Value: Prevents ECU from executing corrupted code during voltage transients by asserting RESET until VCC stabilizes above 2.93V for ≥100ms and detecting stuck loops via 719ms/1.3s watchdog window. |
Use Scenario: Ensures deterministic restart of field-programmable gate array (FPGA) configuration controller after power interruption. IC Role / Device Role / Timing Role: System-level supervisor generating clean reset pulse and independent watchdog fault signal for FPGA configuration state machine. Use Value: Guarantees FPGA reconfiguration only after stable 3.3V supply is confirmed and detects firmware lockups in real-time I/O scanning routines using programmable watchdog timing. |
| Medical Infusion Pump Controller | Railway Signaling Interface Board |
Use Scenario: Provides fail-safe reset and watchdog supervision for ARM Cortex-M4-based pump motor controller operating in Class II medical environment. IC Role / Device Role / Timing Role: Safety-critical supervisory IC asserting hardware reset and pulsing WDPO to trigger NMI interrupt upon detected timing violation. Use Value: Enables immediate firmware intervention on first sign of timing anomaly (e.g., missed WDI pulse >1.3s), meeting IEC 62304 SOUP requirements for hazard mitigation. |
Use Scenario: Supervises 24V-to-3.3V DC-DC converter powering signaling processor in EN 5012x-certified trackside equipment. IC Role / Device Role / Timing Role: High-reliability supervisor monitoring isolated 3.3V rail and providing watchdog fault indication for SIL-2 subsystem monitoring. Use Value: Delivers 100ms minimum reset hold time and validated -40°C to +125°C operation to meet railway environmental stress testing requirements while detecting processor hangs via dual-window watchdog. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT29+T | Same 2.93V reset threshold but H-suffix watchdog (543ms/1.3s fast/slow); 15% shorter fast timeout window | Better suited for applications requiring faster fault response to premature WDI pulses | Select when tighter fast-fault detection (<550ms) is required without changing reset threshold or package |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; single-window watchdog (200ms); push-pull RESET; no WDPO output | Lacks windowed watchdog and independent fault pulse output; limited to non-safety-critical 3.3V systems | Choose only for cost-sensitive, non-automotive designs where dual-window watchdog and WDPO are unnecessary |
Compared with MAX6324EUT29+T, MAX6324HUT29+T offers faster fault detection but identical reset behavior, while TPS3808G33DBVR sacrifices windowed watchdog capability and fault signaling for lower cost and simpler integration in basic 3.3V supervision.
Availability
MAX6324EUT29+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and railway signaling interface boards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6324EUT29+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, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6323/MAX6324 family delivers high-accuracy, windowed watchdog supervision for safety-critical microprocessor systems where deterministic fault detection and brownout resilience are mandatory.
FAQ
What is the exact reset threshold voltage of MAX6324EUT29+T and how is it trimmed?
The MAX6324EUT29+T has a nominal reset threshold of 2.93V with ±2.5% accuracy over -40°C to +125°C, laser-trimmed at wafer sort to match the UT29 suffix specification. This value is guaranteed across temperature and supply voltage variations, enabling reliable supervision of +3.0V rails in automotive and industrial environments where voltage tolerances are tight.
Does MAX6324EUT29+T support windowed watchdog functionality, and what are its timeout values?
Yes, MAX6324EUT29+T implements true min/max (windowed) watchdog functionality with factory-trimmed timeouts of 719ms (fast fault) and 1.3s (slow fault). These values detect both premature WDI pulses (indicating runaway loops) and missing pulses (indicating stalled execution), providing superior fault coverage compared to single-window supervisors.
How does the open-drain RESET output of MAX6324EUT29+T interface with microcontrollers having bidirectional reset pins?
The open-drain RESET output of MAX6324EUT29+T connects directly to bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pullup resistor. This allows either the MAX6324EUT29+T or the µP to assert reset, enabling coordinated system recovery without additional logic or level shifters.
What is the minimum VCC voltage at which MAX6324EUT29+T guarantees valid RESET assertion?
MAX6324EUT29+T guarantees valid RESET assertion down to VCC = +1.2V, ensuring deterministic reset behavior during deep brownout conditions such as automotive cranking events. Below this voltage, the output transitions to high-impedance, but the asserted state remains valid through the full 100ms timeout period.
Can MAX6324EUT29+T be used in AEC-Q100 qualified automotive designs?
While MAX6324EUT29+T itself is not explicitly AEC-Q100 certified, it belongs to the same MAX6324 family as the AEC-Q100 qualified MAX6324HUT44/V+T variant. It shares identical BiCMOS process, SOT23-6 packaging, test methodology, and qualification flow-enabling automotive program adoption with minimal additional validation effort.
MAX6324EUT29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
MAX6324EUT29+T FAQ
1.How can I place an order for MAX6324EUT29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324EUT29+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 MAX6324EUT29+T reliable?
The price and inventory of MAX6324EUT29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324EUT29+T is usually 5 days.
3.What payment methods are accepted for MAX6324EUT29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324EUT29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324EUT29+T?
MAX6324EUT29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324EUT29+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 MAX6324EUT29+T?
For technical support, including MAX6324EUT29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324EUT29+T requirements.
6.How does Aetrix verify that MAX6324EUT29+T is sourced from the original manufacturer or authorized distributors?
All MAX6324EUT29+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 MAX6324EUT29+T meets industry standards.
7.What is the process for return or replacement of MAX6324EUT29+T?
All MAX6324EUT29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324EUT29+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 MAX6324EUT29+T part is unused and in its original packaging.
Return procedure for MAX6324EUT29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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