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Analog Devices Inc./Maxim Integrated MAX6324BUT46+T
- Part No.:
- MAX6324BUT46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324BUT46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,803
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Product details
Overview
MAX6324BUT46+T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, open-drain RESET output, and factory-trimmed 4.63V reset threshold (±2.5% accuracy). It monitors +5.0V supply rails in automotive and industrial systems, asserts RESET low on VCC drop or manual reset, and guarantees valid reset down to VCC = +1.2V.
For engineers reviewing the MAX6324BUT46+T datasheet, MAX6324BUT46+T pinout, MAX6324BUT46+T application, or MAX6324BUT46+T equivalent, key selection criteria include its B-windowed watchdog timeout (10ms fast / 100ms slow), 23µA typical supply current, -40°C to +125°C operation, SOT23-6 package, and AEC-Q100-comparable robustness for safety-critical embedded control.
Technical Context
The MAX6324BUT46+T implements a dual-threshold watchdog that detects both fast faults (WDI falling edges <10ms apart) and slow faults (no WDI edge >100ms), generating a 1ms open-drain WDPO pulse per fault. Its reset comparator uses laser-trimmed precision to maintain ±2.5% accuracy across temperature.
RESET is open-drain with guaranteed validity down to VCC = +1.2V and a minimum 100ms timeout after VCC recovery or MR deassertion. The internal MR pullup (50–85kΩ) enables direct switch interface without external components, and WDI accepts pulses ≥300ns wide with 100ns glitch immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (4.50V–4.75V range), ±2.5% accuracy over -40°C to +125°C - ensures reliable brownout detection for +5.0V systems |
| Watchdog Timeout (Fast) | 10ms min / 15ms typ - triggers WDPO on WDI pulses too close together, detecting runaway loops or clock faults |
| Watchdog Timeout (Slow) | 100ms min / 150ms typ - triggers WDPO if WDI stalls, catching hung firmware or execution freezes |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V - enables always-on monitoring in battery-backed or low-power embedded systems |
| Reset Timeout Delay | 100ms minimum after VCC rise or MR release - provides sufficient hold time for µP initialization and memory stabilization |
| Operating Temperature | -40°C to +125°C - supports under-hood automotive, industrial PLC, and medical equipment environments |
| VCC Range | 1.2V to 5.5V - allows operation during deep brownout while maintaining functional RESET assertion |
Pinout & Package
MAX6324BUT46+T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), optimized for space-constrained PCB layouts and reflow-compatible lead-free assembly (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Internally pulled up (50–85kΩ); asserts RESET and clears watchdog on low pulse ≥1µs - enables hardware-initiated recovery without external components |
| 2 GND | Ground reference | Return path for all internal circuits; must be connected to system ground plane for stable reset timing and noise immunity |
| 3 WDI | Watchdog input | Falling-edge-triggered; resets internal timer on each valid edge ≥300ns - used by firmware to signal healthy execution flow |
| 4 VCC | Supply voltage input | Powers device and serves as monitored rail; requires ≥500pF bypass capacitor for transient immunity in noisy environments |
| 5 WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault detection; requires external pullup to ≤+6V - provides independent fault signaling without affecting RESET state |
| 6 RESET | Active-low open-drain reset output | Asserted when VCC < 4.63V or MR low; held for ≥100ms post-recovery - interfaces directly with bidirectional µP reset pins using single pullup resistor |
Key Features
| Feature | Design Value |
|---|---|
| Windowed (min/max) watchdog | Detects both premature and delayed WDI edges - prevents false resets from jitter while catching true hangs or clock failures |
| Factory-trimmed reset threshold | 4.63V with ±2.5% tolerance over full temperature range - eliminates need for external resistor dividers in +5.0V applications |
| Guaranteed RESET validity to VCC = +1.2V | Ensures deterministic reset behavior during brownout recovery - avoids undefined logic states in µP reset circuitry |
| Debounced manual reset input | 100ns glitch immunity and internal pullup - supports direct switch connection without RC networks or Schmitt triggers |
| Low quiescent current | 23µA typical - extends battery life in always-on monitoring applications such as telematics or sensor nodes |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 5V power rail and software execution in engine management systems where undetected firmware lockups could cause emissions or safety violations. IC Role / Device Role / Timing Role: Provides power-on reset, brownout protection, and windowed watchdog supervision of main MCU's WDI signal. Use Value: Prevents uncontrolled engine operation by forcing hard reset on slow watchdog timeout (>100ms), meeting ASIL-B functional safety expectations. |
Use Scenario: Ensures deterministic startup and runtime integrity in DIN-rail mounted PLCs operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Generates clean reset pulse on power-up and asserts WDPO on firmware stall, enabling diagnostic logging before system restart. Use Value: Maintains 100ms minimum reset hold time even during rapid VCC transients, guaranteeing FPGA or ARM core initialization completes reliably. |
| Medical Infusion Pump Controller | Embedded Telematics Gateway |
Use Scenario: Supervises critical 5V supply and real-time task scheduler in Class II medical devices requiring IEC 62304 compliance. IC Role / Device Role / Timing Role: Delivers fail-safe reset and independent WDPO fault indication to separate safety monitor circuitry. Use Value: Open-drain RESET and WDPO outputs allow level-shifting to isolated 3.3V logic domains, supporting redundant safety architecture. |
Use Scenario: Provides always-on power supervision and watchdog coverage for LTE/Wi-Fi communication modules in vehicle-to-cloud gateways. IC Role / Device Role / Timing Role: Monitors main 5V rail and pulses WDI from host processor's heartbeat thread; WDPO triggers NMI for non-maskable error handling. Use Value: 23µA supply current enables continuous monitoring during sleep modes, extending battery backup runtime during ignition-off periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT46+T | Slower watchdog windows: 543ms fast / 1.3s slow timeout vs. B-version's 10ms/100ms | Suitable for less time-critical applications like metering or HVAC controllers where longer fault detection latency is acceptable | Select MAX6324BUT46+T when fast response to software hangs (<100ms) is required; choose H-version for relaxed timing budgets |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no windowed watchdog - only basic power-on/brownout reset and simple timeout watchdog | Applicable in cost-sensitive 3.3V systems lacking need for min/max timing validation of firmware execution | Use MAX6324BUT46+T when 4.63V reset and dual-threshold watchdog are mandatory; TPS3808G33DBVR fits simpler 3.3V-only designs |
Compared with MAX6324HUT46+T and TPS3808G33DBVR, MAX6324BUT46+T uniquely delivers precise +5.0V rail supervision with sub-100ms fault detection via its B-windowed watchdog - essential for real-time automotive and industrial control where rapid failure containment is required.
Availability
MAX6324BUT46+T is available at Aetrix Electronics and suitable for automotive ECU, industrial PLC, and medical infusion pump applications requiring stable component supply, AEC-Q100-aligned reliability, and long-term production continuity.
Supply support for MAX6324BUT46+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6324 series targets safety-critical embedded systems needing precise voltage monitoring and intelligent watchdog supervision - specifically engineered for automotive-grade reliability and extended temperature operation.
FAQ
What is the exact reset threshold voltage of MAX6324BUT46+T?
The MAX6324BUT46+T has a nominal reset threshold of 4.63V, with a guaranteed range of 4.50V to 4.75V at -40°C to +125°C. This ±2.5% accuracy is laser-trimmed at wafer test and applies specifically to the UT46 variant, making it ideal for monitoring +5.0V supplies in automotive and industrial systems where tight voltage tolerance is required.
Does MAX6324BUT46+T support windowed watchdog functionality?
Yes, MAX6324BUT46+T implements true windowed (min/max) watchdog supervision. Its B-suffix configures fast timeout at 10ms minimum and slow timeout at 100ms minimum - detecting both premature WDI pulses (indicating runaway loops) and missing pulses (indicating firmware stalls). This dual-threshold capability is explicitly defined in the datasheet's Watchdog Timeout table for MAX6324BUT46+T.
What is the supply current consumption of MAX6324BUT46+T?
The MAX6324BUT46+T draws 23µA typical supply current at VCC = 2.5V or 3.3V, and 27µA typical at VCC = 5.5V. This ultra-low quiescent current is measured under no-load conditions with RESET deasserted, enabling use in battery-backed or energy-conscious embedded systems where continuous supervision must minimize power overhead.
How does the manual reset (MR) input function on MAX6324BUT46+T?
The MR input on MAX6324BUT46+T is active-low with an internal 50–85kΩ pullup resistor, allowing direct connection to a momentary switch without external components. A low pulse ≥1µs asserts RESET and clears the watchdog timer. After MR releases, RESET remains asserted for ≥100ms - ensuring µP reset hold time meets industry-standard initialization requirements.
What package type and footprint does MAX6324BUT46+T use?
MAX6324BUT46+T uses a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175), with RoHS-compliant lead-free termination indicated by the "+T" suffix. This compact surface-mount package supports automated assembly and thermal performance of θJA = 115°C/W on multi-layer boards, matching standard SOT23 footprints used across Maxim's supervisory portfolio.
MAX6324BUT46+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:
- 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
MAX6324BUT46+T FAQ
1.How can I place an order for MAX6324BUT46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324BUT46+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 MAX6324BUT46+T reliable?
The price and inventory of MAX6324BUT46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324BUT46+T is usually 5 days.
3.What payment methods are accepted for MAX6324BUT46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324BUT46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324BUT46+T?
MAX6324BUT46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324BUT46+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 MAX6324BUT46+T?
For technical support, including MAX6324BUT46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324BUT46+T requirements.
6.How does Aetrix verify that MAX6324BUT46+T is sourced from the original manufacturer or authorized distributors?
All MAX6324BUT46+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 MAX6324BUT46+T meets industry standards.
7.What is the process for return or replacement of MAX6324BUT46+T?
All MAX6324BUT46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324BUT46+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 MAX6324BUT46+T part is unused and in its original packaging.
Return procedure for MAX6324BUT46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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