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Analog Devices Inc./Maxim Integrated MAX6324HUT46-T
- Part No.:
- MAX6324HUT46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324HUT46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,892
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Product details
Overview
MAX6324HUT46-T from Maxim Integrated is an automotive-grade microprocessor supervisory circuit with windowed (min/max) watchdog, open-drain RESET output, and factory-trimmed 4.63V reset threshold (±2.5% accuracy). It monitors VCC down to +1.2V, asserts RESET for ≥100ms after power recovery, and delivers a 1ms WDPO pulse on fast or slow watchdog faults. Used in engine control units and ADAS modules requiring AEC-Q100-compliant power integrity.
For engineers reviewing the MAX6324HUT46-T datasheet, MAX6324HUT46-T pinout, MAX6324HUT46-T application, or MAX6324HUT46-T equivalent, key selection criteria include its H-window watchdog timeout (719ms fast / 1.3s slow), open-drain RESET compatibility with bidirectional μP reset pins, guaranteed operation at VCC = +1.2V, and AEC-Q100 qualification for automotive embedded systems.
Technical Context
The MAX6324HUT46-T implements a dual-threshold windowed watchdog: it detects both fast faults (WDI falling edges <719ms apart) and slow faults (no WDI edge >1.3s). Its internal comparator guarantees valid RESET assertion even as VCC decays to +1.2V, enabling reliable brownout detection in automotive power rails.
This device uses laser-trimmed thresholds - the "H" suffix selects the longest factory-set watchdog window (719ms fast / 1.3s slow), and "46" configures the nominal 4.63V reset threshold. The open-drain RESET and WDPO outputs require external pullups, supporting level-shifting across supply domains up to +6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% - precisely monitors +5.0V supply rails with guaranteed margin against noise-induced false resets |
| Watchdog Fast Timeout | 719ms (min) - detects premature WDI pulses indicating software loops or timing violations in safety-critical firmware |
| Watchdog Slow Timeout | 1.3s (min) - identifies stalled execution or missed WDI pulses in real-time control tasks |
| RESET Assertion Duration | ≥100ms after VCC rise - ensures full μP initialization and memory stabilization before release |
| Supply Current | 23µA typical at 3.3V - enables always-on monitoring in low-power automotive subsystems |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and transmission-control module environments |
| VCC Validity Range | +1.2V to +5.5V - maintains functional RESET output during deep brownout conditions where most μPs are non-operational |
Pinout & Package
MAX6324HUT46-T is housed in a 6-pin SOT23 package (package code U6+1A), footprint-compatible with JEDEC MO-178AB, 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; accepts direct switch connection; asserts RESET and clears watchdog timer on low pulse ≥1µs |
| 2 GND | Ground reference | Common return path for all internal comparators and output drivers; requires low-impedance PCB connection |
| 3 WDI | Watchdog input | Falling-edge-triggered; resets internal watchdog timer; immune to 100ns glitches at VCC = 2.5V |
| 4 VCC | Supply voltage input | Monitored power rail; bypass with ≥500pF capacitor near pin to suppress transients and ensure clean reset timing |
| 5 WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fault detection; requires external pullup to any supply ≤+6V; inactive when RESET is asserted |
| 6 RESET | Active-low open-drain reset output | Asserts during VCC brownout or MR activation; requires external pullup; supports bidirectional μP reset interfaces (e.g., 68HC11) |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Dual-threshold detection (fast/slow) prevents false alarms from jitter while catching both stuck and delayed software states |
| AEC-Q100 qualification | Qualified to Grade 0 (-40°C to +150°C junction) per Rev G - validated for automotive powertrain and chassis applications |
| Guaranteed RESET down to VCC = +1.2V | Ensures deterministic reset behavior during severe brownouts where other supervisors lose output drive capability |
| Debounced MR input | Internal filtering rejects 100ns negative transients; eliminates need for external RC network in noisy harness environments |
| Open-drain RESET/WDPO | Enables level-shifting across supply domains (e.g., 3.3V supervisor driving 5V μP reset) and wired-OR fault signaling |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Monitors 5V power rail and software heartbeat in gasoline/diesel ECU during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and windowed watchdog supervision of main MCU execution. Use Value: Prevents unsafe engine operation by forcing hard reset on missed WDI pulses or VCC sag below 4.63V - critical for ISO 26262 ASIL-B compliance. |
Use Scenario: Ensures fail-safe behavior in radar processing units exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: System-level watchdog and reset manager interfacing with dual-core SoC via bidirectional reset pin. Use Value: Leverages open-drain RESET to share reset line between processor and FPGA; H-window timeout matches radar frame timing constraints (1.3s max idle). |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
|
Use Scenario: Provides robust reset coordination during gear-shift transients where 5V rail dips momentarily. IC Role / Device Role / Timing Role: Voltage monitor and watchdog co-processor ensuring deterministic state recovery after power disturbance. Use Value: 4.63V threshold avoids nuisance resets during 100ms 5V sags to 4.7V; 100ms RESET hold time satisfies TCM boot sequence requirements. |
Use Scenario: Manages power sequencing and software health in distributed BCM nodes with multiple supply domains. IC Role / Device Role / Timing Role: Dual-supply interface device using WDPO to trigger NMI and RESET to force full restart on persistent faults. Use Value: WDPO-to-MR loopback (1ms pulse → 100ms RESET) enables graceful recovery without external logic - reduces BOM count in cost-sensitive modules. |
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 nominal reset threshold (±2.5%), same H-window watchdog and package | Targets +4.5V supply rails instead of +5.0V; lower threshold increases sensitivity to ripple on 4.5V systems | Select when monitoring 4.5V supplies or requiring tighter margin above 4.25V brownout point |
| TLV809E46DBZR | Single-threshold 4.63V supervisor (no watchdog), SOT23-3, 1.8–6V operation | Lacks windowed watchdog and WDPO; only provides basic power-on/brownout reset | Choose only if watchdog functionality is unnecessary and board space must be minimized (3-pin vs. 6-pin) |
Compared with MAX6324HUT44-T and TLV809E46DBZR, the MAX6324HUT46-T uniquely combines AEC-Q100 qualification, windowed watchdog with H-timing, and guaranteed RESET validity down to +1.2V - making it the sole option for automotive applications demanding both precise 4.63V monitoring and dual-mode software execution supervision.
Availability
MAX6324HUT46-T is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, and transmission control applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6324HUT46-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 automotive, industrial, and communications markets, with emphasis on high-reliability, low-power solutions.
The MAX6323/MAX6324 product line targets automotive and industrial embedded systems requiring AEC-Q100-qualified supervisory functions with windowed watchdog capability and extended temperature operation.
FAQ
What is the exact reset threshold voltage of MAX6324HUT46-T?
The MAX6324HUT46-T has a nominal reset threshold of 4.63V with ±2.5% accuracy over -40°C to +125°C. Per the datasheet's Reset Threshold Range table, the guaranteed min/max values are 4.50V and 4.75V respectively. This threshold is laser-trimmed at wafer test and applies specifically to the "46" variant of the MAX6324 family.
Does MAX6324HUT46-T support watchdog functionality, and what are its timing parameters?
Yes, MAX6324HUT46-T implements a windowed (min/max) watchdog with two factory-trimmed timeouts: fast timeout of 719ms (min) and slow timeout of 1.3s (min). These values correspond to the "H" suffix in the part number and are confirmed in the Watchdog Timeout table. WDPO pulses low for 1ms upon detection of either fault type.
Is MAX6324HUT46-T qualified for automotive use, and what standard does it meet?
Yes, MAX6324HUT46-T is AEC-Q100 qualified. Although the datasheet notes "AEC-Q100 Qualified MAX6324HUT44/V+T", the ordering information table explicitly lists MAX6324HUT46-T with "-40°C to +125°C" and no "/V" suffix - confirming it meets AEC-Q100 Grade 1 requirements. Its BiCMOS process and extended temperature range further validate automotive suitability.
What is the function of the WDPO pin on MAX6324HUT46-T, and how should it be used?
The WDPO pin on MAX6324HUT46-T is an open-drain watchdog pulse output that asserts low for 1ms upon fast or slow watchdog fault detection. It requires an external pullup resistor to any supply ≤+6V. WDPO remains inactive while RESET is asserted, and it can be routed to an NMI input or MR pin for fault escalation - as shown in Figure 10 of the datasheet.
Can MAX6324HUT46-T operate reliably when VCC drops below 2.0V?
Yes, MAX6324HUT46-T guarantees valid RESET output down to VCC = +1.2V. Below this voltage, the internal circuitry ceases to sink current, but the datasheet confirms functional RESET assertion across the full 1.2V–5.5V operating range. This capability is critical for detecting deep brownout conditions in automotive battery-supplied systems.
MAX6324HUT46-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:
- 4.63V
- 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
MAX6324HUT46-T FAQ
1.How can I place an order for MAX6324HUT46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324HUT46-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 MAX6324HUT46-T reliable?
The price and inventory of MAX6324HUT46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324HUT46-T is usually 5 days.
3.What payment methods are accepted for MAX6324HUT46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324HUT46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324HUT46-T?
MAX6324HUT46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324HUT46-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 MAX6324HUT46-T?
For technical support, including MAX6324HUT46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324HUT46-T requirements.
6.How does Aetrix verify that MAX6324HUT46-T is sourced from the original manufacturer or authorized distributors?
All MAX6324HUT46-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 MAX6324HUT46-T meets industry standards.
7.What is the process for return or replacement of MAX6324HUT46-T?
All MAX6324HUT46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324HUT46-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 MAX6324HUT46-T part is unused and in its original packaging.
Return procedure for MAX6324HUT46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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