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Analog Devices Inc./Maxim Integrated MAX6324FUT46+T
- Part No.:
- MAX6324FUT46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324FUT46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,907
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Product details
Overview
MAX6324FUT46+T from Maxim Integrated is a windowed watchdog supervisory IC for microprocessor systems, featuring open-drain RESET and WDPO outputs, ±2.5% accurate 4.63V reset threshold, 719ms fast timeout / 1.3s slow timeout (H-window), and guaranteed operation down to VCC = +1.2V. It monitors power integrity and software execution in automotive engine control units requiring fail-safe reset behavior.
For engineers reviewing the MAX6324FUT46+T datasheet, MAX6324FUT46+T pinout, MAX6324FUT46+T application, or MAX6324FUT46+T equivalent, key selection criteria include its AEC-Q100-compatible windowed watchdog architecture, factory-trimmed H-window timing, 4.63V reset threshold with 100ms minimum reset timeout, and SOT23-6 open-drain output compatibility with bidirectional μP reset pins.
Technical Context
The MAX6324FUT46+T implements a dual-threshold (min/max) watchdog timer 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, and the open-drain RESET output supports level-shifting across supply domains.
It uses laser-trimmed BiCMOS circuitry to achieve ±2.5% reset threshold accuracy over –40°C to +125°C, with 23µA typical supply current and 100ns MR input glitch immunity. The device requires no external components for basic operation beyond a 500pF VCC bypass capacitor and pullup resistors on RESET and WDPO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (±2.5%), enabling precise brownout detection for +5.0V systems |
| Watchdog Fast Timeout | 719ms (min), used to detect premature WDI pulses indicating runaway code loops |
| Watchdog Slow Timeout | 1.3s (min), used to detect missed WDI pulses indicating processor hang or clock failure |
| Reset Timeout Delay | 100ms minimum, ensuring μP remains held in reset long enough for stable power-up |
| Supply Current | 23µA typical at 3V, supporting ultra-low-power always-on monitoring in battery-backed systems |
| Operating Temperature | –40°C to +125°C, meeting extended industrial and automotive under-hood requirements |
| VCC Range | 1.2V to 5.5V, allowing valid reset assertion even during deep brownout conditions |
Pinout & Package
MAX6324FUT46+T is housed in a 6-pin SOT23 package (package code U6+1A), with 1.6mm × 2.9mm footprint and 0.95mm height, suitable for space-constrained automotive and industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internally pulled up; asserts RESET and clears watchdog timer when driven low ≥1µs; immune to 100ns glitches |
| 2 - GND | Ground reference | Common return path for all internal circuitry; must be connected directly to system ground plane |
| 3 - WDI | Watchdog input | Falling-edge-triggered; resets internal watchdog timer; requires ≥300ns pulse width and 0.75×VCC VIH |
| 4 - VCC | Supply voltage input | Monitored power rail; powers internal circuitry; requires ≥500pF bypass capacitor for noise immunity |
| 5 - WDPO | Open-drain watchdog pulse output | Pulsed low for 1ms on fast/slow fault detection; requires external pullup to ≤+6V; inactive when RESET is asserted |
| 6 - RESET | Active-low open-drain reset output | Asserted when VCC < 4.63V or MR low; held for ≥100ms after recovery; requires external pullup for logic-level compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Windowed (Min/Max) Watchdog | Detects both premature and delayed WDI pulses-critical for safety-critical firmware validation in automotive ECUs |
| Factory-Trimmed H-Window Timing | 719ms fast / 1.3s slow timeout eliminates external timing components and ensures production consistency |
| 4.63V Reset Threshold Accuracy | ±2.5% tolerance over full temperature range enables reliable +5.0V supply monitoring without calibration |
| Open-Drain RESET Output | Supports bidirectional reset interfaces (e.g., Motorola 68HC11) and level-shifting across multiple supply domains |
| Valid RESET Down to VCC = +1.2V | Ensures deterministic reset state during deep brownout, preventing undefined μP behavior before power collapse |
| Low 23µA Supply Current | Enables continuous supervision in always-on subsystems without compromising battery life in automotive telematics |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors main 5V supply and software heartbeat in gasoline/diesel engine controllers where undetected firmware lockup could cause emission or safety violations. IC Role / Device Role / Timing Role: Windowed watchdog supervisor asserting RESET on power anomaly or software stall; WDPO signals fault to diagnostic controller without resetting CPU. Use Value: Enables ISO 26262 ASIL-B compliant fail-safe behavior by distinguishing between transient glitches and persistent faults via dual timeout windows. |
Use Scenario: Ensures deterministic restart of programmable logic controller I/O modules exposed to harsh EMI and wide ambient temperature swings in factory automation. IC Role / Device Role / Timing Role: Provides power-on reset, brownout protection, and software execution monitoring with open-drain RESET compatible with isolated fieldbus interface ICs. Use Value: Guarantees 100ms minimum reset hold time and valid output down to 1.2V, eliminating spurious resets during line transients in 24V-powered industrial backplanes. |
| Medical Infusion Pump Controller | Automotive ADAS Camera Module |
|
Use Scenario: Supervises ARM Cortex-M4-based infusion pump controller where software hangs could lead to uncontrolled drug delivery. IC Role / Device Role / Timing Role: Generates watchdog pulse (WDPO) on timing violation to trigger safety interrupt, while RESET holds MCU in safe state until hardware reset confirmation. Use Value: Factory-trimmed H-window timing eliminates calibration drift over lifetime, satisfying IEC 62304 Class C software safety requirements. |
Use Scenario: Protects vision processing SoC in surround-view camera modules operating near vehicle battery rails subject to load dump and cold crank. IC Role / Device Role / Timing Role: Monitors 5V camera power rail and provides reset assertion during brownout; WDPO feeds fault signal to vehicle CAN bus for diagnostic logging. Use Value: AEC-Q100 qualified operation at +125°C junction temperature ensures reliability in sealed, thermally constrained camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT46/V+T | AEC-Q100 qualified variant with identical electrical specs and H-window timing | Required for automotive production programs needing formal qualification documentation | Select MAX6324HUT46/V+T when automotive PPAP compliance and traceable qualification data are mandatory |
| TPS3808G33DBVR | Single-threshold watchdog (not windowed); 3.3V fixed reset; 200ms reset timeout; 2.5µA quiescent current | Suitable for cost-sensitive consumer applications without functional safety requirements | Choose TPS3808G33DBVR only if windowed watchdog functionality is unnecessary and AEC-Q100 is not required |
Compared with MAX6324FUT46+T, MAX6324HUT46/V+T adds formal AEC-Q100 qualification for automotive use without changing timing or voltage specs, while TPS3808G33DBVR offers lower power but lacks min/max watchdog capability-making it unsuitable for ASIL-B or IEC 62304 Class C designs requiring fault discrimination.
Availability
MAX6324FUT46+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and ADAS camera modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6324FUT46+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 high-reliability, low-power, and safety-certifiable solutions.
The MAX6324FUT46+T belongs to Maxim's μP supervisory circuit family, engineered specifically for functional safety-critical systems requiring windowed watchdog monitoring, precise voltage thresholds, and extended temperature operation.
FAQ
What is the exact reset threshold voltage of MAX6324FUT46+T?
The MAX6324FUT46+T has a nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over –40°C to +125°C. This value is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table under "Reset Threshold Voltage" for suffix UT46. The MAX6324FUT46+T is designed for reliable monitoring of +5.0V power rails in automotive and industrial environments.
Does MAX6324FUT46+T support windowed (min/max) watchdog functionality?
Yes, MAX6324FUT46+T implements true windowed watchdog behavior using the H-window configuration: fast timeout of 719ms (min) and slow timeout of 1.3s (min). This allows detection of both premature WDI pulses (indicating tight-loop stalls) and missing pulses (indicating complete processor hang), a requirement for ISO 26262-compliant systems. The MAX6324FUT46+T datasheet explicitly defines this behavior in the Watchdog Timeout table and Figure 1.
What is the function of the WDPO pin on MAX6324FUT46+T?
The WDPO (Watchdog Pulse Output) pin on MAX6324FUT46+T is an open-drain output that pulses low for 1ms upon detection of either a fast or slow watchdog fault. It operates independently of the RESET output and remains inactive while RESET is asserted. The MAX6324FUT46+T WDPO signal is intended for fault logging, NMI triggering, or diagnostic communication-enabling system-level response without immediate full reset.
Can MAX6324FUT46+T operate reliably at VCC = +1.2V?
Yes, MAX6324FUT46+T guarantees valid RESET output down to VCC = +1.2V, as stated in the General Description and Electrical Characteristics. Below this voltage, the internal circuitry ceases to sink current, but the RESET output remains asserted (low) until VCC recovers above the 4.63V threshold plus timeout. This feature ensures deterministic behavior during deep brownout events critical for automotive and medical applications using the MAX6324FUT46+T.
What package type and footprint does MAX6324FUT46+T use?
MAX6324FUT46+T is supplied in a 6-pin SOT23 package (outline number 21-0058, land pattern 90-0175), measuring 1.6mm × 2.9mm with 0.95mm height. The package code is U6+1A, and it is RoHS-compliant (indicated by the "+T" suffix). This compact footprint supports high-density layouts in automotive control modules and portable medical devices using the MAX6324FUT46+T.
MAX6324FUT46+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
MAX6324FUT46+T FAQ
1.How can I place an order for MAX6324FUT46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324FUT46+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 MAX6324FUT46+T reliable?
The price and inventory of MAX6324FUT46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324FUT46+T is usually 5 days.
3.What payment methods are accepted for MAX6324FUT46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324FUT46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324FUT46+T?
MAX6324FUT46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324FUT46+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 MAX6324FUT46+T?
For technical support, including MAX6324FUT46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324FUT46+T requirements.
6.How does Aetrix verify that MAX6324FUT46+T is sourced from the original manufacturer or authorized distributors?
All MAX6324FUT46+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 MAX6324FUT46+T meets industry standards.
7.What is the process for return or replacement of MAX6324FUT46+T?
All MAX6324FUT46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324FUT46+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 MAX6324FUT46+T part is unused and in its original packaging.
Return procedure for MAX6324FUT46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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