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Analog Devices Inc./Maxim Integrated MAX6324FUT26-T
- Part No.:
- MAX6324FUT26-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324FUT26-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,052
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Product details
Overview
MAX6324FUT26-T from Maxim Integrated is an open-drain microprocessor supervisory circuit with windowed (min/max) watchdog, 2.63V ±2.5% reset threshold, 100ms minimum reset timeout, and operation from 1.2V to 5.5V supply. It monitors power integrity and µP execution timing in automotive engine control units, industrial PLCs, and medical infusion pumps.
For engineers reviewing the MAX6324FUT26-T datasheet, MAX6324FUT26-T pinout, MAX6324FUT26-T application, or MAX6324FUT26-T equivalent, key selection criteria include its factory-trimmed 23ms fast / 47ms slow watchdog window, guaranteed RESET validity down to VCC = +1.2V, open-drain RESET/WDPO outputs compatible with bidirectional µP reset pins, and AEC-Q100-qualified variants.
Technical Context
The MAX6324FUT26-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 upon fault detection. Its reset comparator guarantees valid output down to VCC = +1.2V and features ±2.5% accuracy over –40°C to +125°C.
It uses laser-trimmed internal thresholds and operates with 23µA typical supply current. The MR input includes internal 50–85kΩ pullup and 100ns glitch immunity, while WDI accepts pulses ≥300ns wide and rejects transients <100ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±2.5% - precisely monitors +2.5V rails with brownout detection margin |
| Reset Timeout Delay | 100ms minimum - ensures µP completes power-up initialization before release |
| Fast Watchdog Timeout | 23ms (min), 39ms (max) - detects premature WDI pulses indicating runaway code loops |
| Slow Watchdog Timeout | 47ms (min), 63ms (max) - identifies stalled execution or missed WDI assertions |
| Supply Voltage Range | 1.2V to 5.5V - enables use across low-voltage logic and legacy 5V systems |
| Supply Current | 23µA typical at 3.3V - supports always-on monitoring in battery-backed applications |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments |
Pinout & Package
MAX6324FUT26-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.3mm × 2.2mm 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 low ≥1µs; immune to 100ns glitches |
| 2 - GND | Ground reference | Common return for all internal circuitry; requires low-impedance connection to system ground plane |
| 3 - WDI | Watchdog input | Falling-edge triggered; resets internal timer; requires ≥300ns pulse width; accepts VIH ≥0.75×VCC |
| 4 - VCC | Supply voltage input | Monitored rail input; bypass with ≥500pF capacitor near pin for noise immunity |
| 5 - WDPO | Open-drain watchdog pulse output | Pulsed low for 1ms on fast/slow fault; requires external pullup; active only when RESET is high |
| 6 - RESET | Active-low open-drain reset output | Asserted when VCC <2.63V or MR low; held ≥100ms after recovery; requires external pullup to any supply ≤+6V |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Detects both premature and delayed WDI pulses-critical for safety-critical firmware validation |
| Guaranteed RESET down to VCC = +1.2V | Ensures deterministic reset state even during deep brownout, preventing undefined µP behavior |
| Debounced manual reset input | Eliminates need for external RC network; supports direct switch connection with 1µs minimum assertion |
| Open-drain RESET and WDPO outputs | Enables level-shifting and wired-OR interfacing with multiple supplies or bidirectional µP reset pins |
| Laser-trimmed precision thresholds | ±2.5% reset voltage accuracy and stable watchdog timing over full temperature range |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 2.5V microcontroller supply and validates real-time firmware execution in diesel ECU under vibration and thermal stress. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and windowed watchdog supervision of main µP. Use Value: Prevents unsafe engine operation by forcing reset on missed WDI pulses (>47ms) or spurious pulses (<23ms), meeting ASIL-B functional safety requirements. |
Use Scenario: Ensures deterministic startup and runtime integrity of ARM-based controller in factory automation I/O module exposed to EMI. IC Role / Device Role / Timing Role: System-level supervisor managing VCC stability and µP software health via WDI interface. Use Value: Guarantees 100ms reset hold time for reliable peripheral initialization and eliminates false resets from 20µs VCC transients. |
| Medical Infusion Pump Controller | Railway Signaling Interface Module |
Use Scenario: Secures battery-backed 3.3V MCU in Class II medical device requiring fail-safe delivery control and audit-trail logging. IC Role / Device Role / Timing Role: Safety-critical supervisor asserting RESET and WDPO independently to trigger fault escalation and data capture. Use Value: Open-drain WDPO allows direct NMI triggering without PCB redesign; RESET remains valid down to 1.2V during battery sag. |
Use Scenario: Validates µP operation in EN 5012x-compliant signaling interface operating in wide ambient (-40°C to +70°C) with noisy 24V supply rails. IC Role / Device Role / Timing Role: Dual-role supervisor performing power monitoring and watchdog timing on isolated µP domain. Use Value: 125°C rating and 23µA quiescent current enable long-term reliability in sealed enclosures without forced cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT26-T | Same 2.63V reset threshold but H-window watchdog (719ms fast / 1.3s slow) | Suited for slower-firmware applications like HVAC controllers; not suitable for real-time ECU timing | Select only if extended watchdog windows are required; incompatible for 23ms/47ms timing-critical designs |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no windowed watchdog (only single timeout), 350ms reset delay | Lacks min/max watchdog; limited to basic power monitoring without execution timing validation | Use where cost sensitivity outweighs need for firmware execution supervision; requires layout change for different pinout |
Compared with MAX6324FUT26-T, MAX6324HUT26-T offers longer watchdog windows unsuitable for fast-response systems, while TPS3808G33DBVR lacks windowed watchdog functionality entirely-making MAX6324FUT26-T the only option supporting both precise 2.63V monitoring and dual-threshold timing supervision in a 6-pin SOT23.
Availability
MAX6324FUT26-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6324FUT26-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.
The MAX6323/MAX6324 family delivers robust µP supervision with windowed watchdog and AEC-Q100 qualification, targeting safety-critical embedded systems where power integrity and software execution timing must be continuously validated.
FAQ
What is the exact reset threshold voltage of MAX6324FUT26-T?
The MAX6324FUT26-T has a nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% (2.55V to 2.70V) over –40°C to +125°C. This value is laser-trimmed at wafer test and applies specifically to the "26" suffix variant, matching +2.5V supply rails with appropriate margin for brownout detection. The threshold is referenced internally to VCC and remains stable across temperature and supply variations.
Does MAX6324FUT26-T support windowed watchdog functionality, and what are its timeout values?
Yes, MAX6324FUT26-T implements true min/max (windowed) watchdog supervision. Its factory-trimmed timeouts are 23ms (min) / 39ms (max) for fast faults and 47ms (min) / 63ms (max) for slow faults. These values are confirmed in the Electrical Characteristics table under "Watchdog Timeout (Fast)" and "Watchdog Timeout (Slow)" for the "FUT" suffix. The window ensures detection of both premature and delayed WDI pulses-critical for validating correct µP instruction flow.
What is the function of the WDPO pin on MAX6324FUT26-T, and how should it be used?
The WDPO pin on MAX6324FUT26-T is an open-drain watchdog pulse output that asserts low for 1ms upon detection of either a fast or slow watchdog fault. It remains inactive while RESET is asserted and requires an external pullup resistor (typically 4.7kΩ–10kΩ) to a supply ≤+6V. WDPO can drive an NMI input for nonmaskable interrupt handling or be looped back to MR to force a full 100ms reset-enabling flexible fault response strategies without additional logic.
Can MAX6324FUT26-T operate reliably down to 1.2V supply voltage?
Yes, MAX6324FUT26-T guarantees valid RESET output down to VCC = +1.2V, as explicitly stated in the General Description and Electrical Characteristics. Below this voltage, the internal circuitry ceases sinking current, but the output remains well-defined through the external pullup. This capability ensures deterministic reset behavior during deep brownout conditions common in automotive stop-start systems and battery-powered medical devices-where other supervisors may fail silently.
Is MAX6324FUT26-T qualified for automotive applications?
While MAX6324FUT26-T itself is not explicitly marked AEC-Q100 qualified in the provided documentation, the MAX6324HUT44/V+T variant is cited as AEC-Q100 qualified, and the MAX6324FUT26-T shares identical process (BiCMOS), package (SOT23), temperature range (–40°C to +125°C), and absolute maximum ratings-including lead-free compliance and soldering profiles matching automotive standards. Its design intent and electrical specifications fully align with automotive-grade supervision requirements.
MAX6324FUT26-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:
- 2.63V
- 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
MAX6324FUT26-T FAQ
1.How can I place an order for MAX6324FUT26-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324FUT26-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 MAX6324FUT26-T reliable?
The price and inventory of MAX6324FUT26-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324FUT26-T is usually 5 days.
3.What payment methods are accepted for MAX6324FUT26-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324FUT26-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324FUT26-T?
MAX6324FUT26-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324FUT26-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 MAX6324FUT26-T?
For technical support, including MAX6324FUT26-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324FUT26-T requirements.
6.How does Aetrix verify that MAX6324FUT26-T is sourced from the original manufacturer or authorized distributors?
All MAX6324FUT26-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 MAX6324FUT26-T meets industry standards.
7.What is the process for return or replacement of MAX6324FUT26-T?
All MAX6324FUT26-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324FUT26-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 MAX6324FUT26-T part is unused and in its original packaging.
Return procedure for MAX6324FUT26-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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