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Analog Devices Inc./Maxim Integrated MAX6324FUT29-T
- Part No.:
- MAX6324FUT29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324FUT29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,390
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Product details
Overview
MAX6324FUT29-T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, open-drain RESET output, and factory-trimmed 2.93V reset threshold (±2.5% accuracy). It monitors VCC down to +1.2V, asserts RESET for ≥100ms after power recovery, and delivers 1ms WDPO fault pulses. Used in automotive engine control units for fail-safe processor supervision.
For engineers reviewing the MAX6324FUT29-T datasheet, MAX6324FUT29-T pinout, MAX6324FUT29-T application, or MAX6324FUT29-T equivalent, key selection criteria include its 2.93V reset threshold, F-suffix 23ms fast/47ms slow watchdog timeout, -40°C to +125°C operation, SOT23-6 package, and AEC-Q100-compliant variants.
Technical Context
The MAX6324FUT29-T implements a dual-window watchdog that detects both fast faults (WDI falling edges <23ms apart) and slow faults (no WDI edge >47ms), with WDPO pulsed low for 1ms on fault detection. Its reset comparator guarantees valid output down to VCC = +1.2V and features ±2.5% threshold accuracy over temperature.
It uses laser-trimmed internal references for precise 2.93V reset threshold (2.85V–3.00V range) and fixed F-suffix timing (23ms fast / 47ms slow), with MR input debounced and glitch-immune. The open-drain RESET requires external pullup; WDPO is also open-drain and active only when RESET is deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (2.85V–3.00V), ±2.5% accuracy ensures reliable brownout detection for 3.3V systems |
| Watchdog Fast Timeout | 23ms (min), detects processor lockup or premature WDI pulses in safety-critical loops |
| Watchdog Slow Timeout | 47ms (min), identifies stalled execution or missed WDI edges in real-time firmware |
| RESET Assertion Delay | ≥100ms after VCC rise & MR release, guarantees full µP initialization before release |
| Supply Current | 23µA typical at 3.3V, enables always-on monitoring in battery-backed automotive modules |
| Operating Temperature | -40°C to +125°C, qualified for under-hood engine control and transmission ECU environments |
| VCC Range | 1.2V to 5.5V, supports valid RESET assertion during deep brownout conditions |
Pinout & Package
MAX6324FUT29-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.3mm × 2.1mm footprint and 0.95mm height, suitable for space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internally pulled up; 1µs minimum pulse width; resets watchdog timer and asserts RESET |
| 2 - GND | Ground reference | Common return path for all internal circuits and external bypass capacitors |
| 3 - WDI | Watchdog input | Falling-edge triggered; clears internal timer; 300ns minimum pulse width required |
| 4 - VCC | Supply voltage input | Monitored supply rail; requires ≥500pF bypass capacitor for noise immunity |
| 5 - WDPO | Open-drain watchdog pulse output | Pulsed low for 1ms on fast/slow fault; requires external pullup to ≤+6V |
| 6 - RESET | Active-low open-drain reset output | Asserted during VCC brownout or MR activation; requires external pullup for logic-level compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Dual-timing detection (fast + slow) prevents false resets from transient noise while catching stuck/frozen code |
| Laser-trimmed reset threshold | 2.93V ±2.5% eliminates external resistor networks and improves system-level voltage margin |
| Guaranteed RESET down to VCC = +1.2V | Ensures deterministic reset state even during severe brownout, critical for automotive ASIL-B compliance |
| Debounced MR input | 100ns glitch immunity and no external RC needed simplifies front-panel or diagnostic reset interface |
| Low quiescent current | 23µA typical enables continuous supervision in always-on vehicle domains without battery drain |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
Use Scenario: Monitors main 3.3V microcontroller supply and validates software execution timing in gasoline/diesel engine management. IC Role / Device Role / Timing Role: Windowed watchdog supervisor asserting RESET on brownout and WDPO on out-of-window WDI pulses. Use Value: Prevents unsafe engine operation by forcing reset on firmware hang or clock failure, meeting ISO 26262 ASIL-B requirements. | Use Scenario: Supervises dual-core safety MCU in automatic transmission controller where deterministic fault response is mandatory. IC Role / Device Role / Timing Role: Provides independent reset assertion and watchdog pulse signaling to separate safety monitor logic. Use Value: Enables separation of safety-critical reset generation from primary MCU, supporting redundant fault handling per ISO 26262 Part 10. |
| Brake-by-Wire Actuator | ADAS Domain Controller Power Sequencer |
Use Scenario: Embedded in electro-hydraulic brake module to supervise actuator driver MCU during active braking cycles. IC Role / Device Role / Timing Role: Detects WDI timing violations caused by sensor fusion algorithm stalls or CAN message loss. Use Value: Triggers immediate WDPO pulse to initiate fallback mode and RESET assertion to reinitialize actuator control stack. | Use Scenario: Manages power-up sequencing and runtime supervision of multi-rail ADAS SoC (e.g., 1.8V core, 3.3V I/O, 5V sensors). IC Role / Device Role / Timing Role: Monitors primary 3.3V rail and provides watchdog feedback to system manager via WDPO interrupt line. Use Value: Reduces BOM count by replacing discrete reset IC + external watchdog timer with single integrated solution. |
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 (719ms fast / 1.3s slow) | Targeted at slower-firmware applications (e.g., HVAC controllers); not suitable for real-time ECU timing | Select MAX6324FUT29-T when fast fault detection (<25ms) is required for safety-critical response. |
| TLV803EB29DBVR | Single-threshold reset (2.93V), no watchdog, push-pull RESET, 1.8–6V VCC range | Basic power-on reset only; lacks windowed watchdog for runtime code validation | Choose TLV803EB29DBVR only if watchdog functionality is handled externally or unnecessary. |
Compared with MAX6324HUT29-T and TLV803EB29DBVR, the MAX6324FUT29-T uniquely balances precise 2.93V reset accuracy with sub-25ms fast watchdog response-enabling ISO 26262-compliant fault detection in automotive real-time control without adding external timing components.
Availability
MAX6324FUT29-T is available at Aetrix Electronics and suitable for automotive engine control, transmission management, and brake-by-wire systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6324FUT29-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 communications applications.
The MAX6323/MAX6324 family was engineered specifically for AEC-Q100-compliant microprocessor supervision in harsh automotive environments, emphasizing windowed watchdog reliability, wide-temperature operation, and guaranteed reset validity down to 1.2V.
FAQ
What is the exact reset threshold voltage of MAX6324FUT29-T?
The MAX6324FUT29-T has a nominal reset threshold of 2.93V, with a guaranteed range of 2.85V to 3.00V at -40°C to +125°C. This value is laser-trimmed at wafer test and specified with ±2.5% accuracy, making it suitable for precise supervision of 3.3V digital rails in automotive ECUs.
How does the windowed watchdog in MAX6324FUT29-T differ from standard watchdog timers?
The MAX6324FUT29-T implements a true min/max (windowed) watchdog: it triggers WDPO on both fast faults (WDI falling edges <23ms apart) and slow faults (no WDI edge >47ms). This prevents false timeouts from noise while reliably detecting frozen or runaway code-unlike single-timer watchdogs that only detect slow faults.
Can MAX6324FUT29-T operate with a 1.8V supply?
No. The MAX6324FUT29-T requires VCC between 1.2V and 5.5V for operation, but its 2.93V reset threshold means it is intended for monitoring 3.3V or higher rails. At 1.8V, VCC remains above the reset threshold, so RESET stays deasserted-but the device itself draws current and functions normally down to 1.2V.
What is the purpose of the WDPO pin on MAX6324FUT29-T?
The WDPO pin on MAX6324FUT29-T is an open-drain watchdog pulse output that asserts low for 1ms upon detection of either a fast or slow watchdog fault. Unlike RESET, WDPO provides non-latching fault signaling-enabling external logic or safety monitors to log errors or enter degraded modes without resetting the entire system.
Is MAX6324FUT29-T AEC-Q100 qualified?
The base MAX6324FUT29-T is not explicitly AEC-Q100 qualified per the datasheet; however, the pin-compatible MAX6324HUT44/V+T variant is AEC-Q100 Grade 0 qualified. For automotive applications requiring formal qualification, designers should select /V-suffixed versions or consult Maxim's automotive-grade ordering codes.
MAX6324FUT29-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
MAX6324FUT29-T FAQ
1.How can I place an order for MAX6324FUT29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324FUT29-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 MAX6324FUT29-T reliable?
The price and inventory of MAX6324FUT29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324FUT29-T is usually 5 days.
3.What payment methods are accepted for MAX6324FUT29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324FUT29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324FUT29-T?
MAX6324FUT29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324FUT29-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 MAX6324FUT29-T?
For technical support, including MAX6324FUT29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324FUT29-T requirements.
6.How does Aetrix verify that MAX6324FUT29-T is sourced from the original manufacturer or authorized distributors?
All MAX6324FUT29-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 MAX6324FUT29-T meets industry standards.
7.What is the process for return or replacement of MAX6324FUT29-T?
All MAX6324FUT29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324FUT29-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 MAX6324FUT29-T part is unused and in its original packaging.
Return procedure for MAX6324FUT29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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