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Analog Devices Inc./Maxim Integrated MAX6324AUT46-T
- Part No.:
- MAX6324AUT46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324AUT46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
MAX6324AUT46-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 VCC down to +1.2V, asserts RESET for ≥100ms after power-up, and delivers 1ms WDPO fault pulses on fast/slow watchdog timeouts. Used in automotive engine control units for fail-safe boot sequencing and brownout recovery.
For engineers reviewing the MAX6324AUT46-T datasheet, MAX6324AUT46-T pinout, MAX6324AUT46-T application, or MAX6324AUT46-T equivalent, key selection criteria include its AEC-Q100-qualified operation over –40°C to +125°C, SOT23-6 package compatibility, 23µA typical supply current, and dual-fault watchdog detection timing windows.
Technical Context
The MAX6324AUT46-T implements a laser-trimmed windowed watchdog that detects both fast faults (WDI falling edges <1.5ms apart) and slow faults (no WDI edge >10s), with eight factory-set timeout options. Its reset comparator guarantees valid RESET assertion down to VCC = +1.2V and holds RESET low for ≥100ms after VCC exceeds 4.63V.
This device uses an open-drain RESET output requiring external pullup, and an open-drain WDPO output pulsed low for 1ms on fault detection. MR input is internally pulled up and debounced, supporting direct switch connection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% - precisely matches +5.0V rail monitoring with guaranteed margin against false resets |
| Reset Timeout Delay | 100–280ms - ensures stable µP initialization before release from reset state |
| Watchdog Fast Timeout | 1.5ms min - detects runaway loops or clock faults with sub-millisecond resolution |
| Watchdog Slow Timeout | 10s max - identifies complete software hangs or halted execution in safety-critical systems |
| Supply Current | 23µA typ at 3.3V - enables always-on supervision in battery-backed or low-power automotive modules |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 |
| VCC Range | 1.2V to 5.5V - supports valid reset assertion during deep brownout conditions |
Pinout & Package
MAX6324AUT46-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), optimized for space-constrained PCB layouts in automotive and industrial control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Internally pulled up; asserts RESET and clears watchdog timer when pulled low ≥1µs; immune to 100ns glitches |
| 2 GND | Ground reference | Common return path for all internal circuits; requires low-inductance connection to system ground plane |
| 3 WDI | Watchdog input | Falling-edge-triggered; resets internal watchdog timer; minimum pulse width 300ns; glitch-immune at 100ns |
| 4 VCC | Supply voltage input | Monitored rail input; bypass with ≥500pF capacitor near pin for noise immunity in noisy automotive environments |
| 5 WDPO | Open-drain watchdog pulse output | Pulsed low for 1ms on fast/slow fault detection; requires external pullup to ≤+6V; active only when RESET is high |
| 6 RESET | Active-low open-drain reset output | Asserted when VCC < 4.63V or MR low; held ≥100ms after recovery; requires external pullup for logic-level compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Detects both premature (fast) and delayed (slow) WDI transitions-critical for validating deterministic real-time behavior in engine control firmware |
| Factory-trimmed reset threshold | 4.63V nominal with ±2.5% tolerance across –40°C to +125°C-eliminates need for external resistor dividers in +5V systems |
| Guaranteed RESET validity to VCC = +1.2V | Ensures clean, unambiguous reset signal even during severe brownout-prevents metastability in downstream logic |
| Debounced MR input | Supports direct mechanical switch connection without RC network-reduces BOM count and layout area in service-accessible modules |
| AEC-Q100 qualification | Validated for automotive use including temperature cycling, HTOL, and ESD testing-meets functional safety readiness requirements |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors +5V main supply and validates firmware execution timing during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and windowed watchdog supervision of ECU microcontroller. Use Value: Prevents unsafe operation during voltage transients by asserting RESET within 20µs of VCC dropping below 4.63V and triggering WDPO on stuck-loop faults. |
Use Scenario: Ensures deterministic startup and runtime integrity of programmable logic controller I/O processors in factory automation cabinets. IC Role / Device Role / Timing Role: System-level supervisor managing reset sequencing and detecting firmware stalls in isolated I/O communication stacks. Use Value: Delivers 100ms minimum reset hold time and 1ms WDPO fault pulses compatible with NMI interrupt handling-enabling rapid fault containment without full system reboot. |
| Medical Infusion Pump Controller | Railway Signaling Interface |
|
Use Scenario: Guarantees safe shutdown and restart of motor control firmware during AC line sags or battery voltage drops in portable infusion devices. IC Role / Device Role / Timing Role: Safety-critical supervisory IC enforcing power-rail integrity and software liveness checks per IEC 62304 Class C requirements. Use Value: Provides validated reset assertion down to VCC = +1.2V and dual-window watchdog-ensuring no silent failure during critical drug delivery sequences. |
Use Scenario: Supervises microcontroller operation in trackside signaling interfaces exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: High-reliability watchdog and reset manager operating across –40°C to +125°C with immunity to conducted transients. Use Value: Leverages 10s slow-watchdog timeout and 1.5ms fast timeout to detect both catastrophic lockups and subtle timing drift in SIL-4 compliant subsystems. |
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 | Uses H-window watchdog (719ms fast / 1.3s slow) instead of A-window (1.5ms / 10ms); otherwise identical reset threshold, package, and electrical specs | Better suited for applications requiring longer watchdog windows-e.g., slower polling-based firmware or systems with variable task scheduling | Select MAX6324HUT46-T when firmware execution intervals exceed 10ms; retain MAX6324AUT46-T for tight real-time loops requiring sub-2ms fault detection |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no windowed watchdog (single timeout), push-pull RESET output, lower quiescent current (1.1µA) | Targeted at cost-sensitive, non-safety-critical embedded systems where deterministic timing validation is not required | Choose TPS3808G33DBVR only for simple power-monitoring tasks; MAX6324AUT46-T remains mandatory where ISO 26262 ASIL-B/C compliance demands dual-fault watchdog coverage |
Compared with MAX6324HUT46-T and TPS3808G33DBVR, the MAX6324AUT46-T uniquely combines A-window fast/slow watchdog timing, 4.63V precision reset, and AEC-Q100 qualification-making it the only option for automotive ECU designs requiring sub-2ms fault response and +5V rail supervision.
Availability
MAX6324AUT46-T is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC I/O modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6324AUT46-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 reliability, low power, and high integration.
The MAX6324 series belongs to Maxim's µP supervisory product line, engineered specifically for safety-critical systems requiring deterministic reset behavior, robust watchdog supervision, and AEC-Q100-compliant operation.
FAQ
What is the exact reset threshold voltage of the MAX6324AUT46-T?
The MAX6324AUT46-T has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% across –40°C to +125°C. This value is laser-trimmed during production and specified in the Electrical Characteristics table as 4.50V (min), 4.63V (typ), and 4.75V (max) at full temperature range.
Does the MAX6324AUT46-T support windowed watchdog functionality?
Yes, the MAX6324AUT46-T implements a true windowed (min/max) watchdog. Its A-window configuration provides a fast timeout of 1.5ms (minimum interval between WDI falling edges) and a slow timeout of 10ms (maximum allowable interval), enabling detection of both premature and delayed watchdog pulses.
What is the function of the WDPO pin on the MAX6324AUT46-T?
The WDPO (Watchdog Pulse Output) pin on the MAX6324AUT46-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 signal and remains inactive while RESET is asserted, allowing separate fault signaling and reset control paths.
Can the MAX6324AUT46-T operate reliably in automotive under-hood environments?
Yes, the MAX6324AUT46-T is rated for –40°C to +125°C operation and is AEC-Q100 qualified (as confirmed by the /V suffix variants in the family). Its design includes robust glitch immunity, guaranteed reset validity down to VCC = +1.2V, and thermal performance validated for under-hood deployment in engine control units.
How does the manual reset (MR) input behave on the MAX6324AUT46-T?
The MR input on the MAX6324AUT46-T is active-low, internally pulled up to VCC, and debounced to reject 100ns transients. When asserted low for ≥1µs, it forces RESET low, clears the watchdog timer, and places WDPO in high-impedance state. After MR release, RESET remains asserted for ≥100ms regardless of VCC status.
MAX6324AUT46-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
MAX6324AUT46-T FAQ
1.How can I place an order for MAX6324AUT46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324AUT46-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 MAX6324AUT46-T reliable?
The price and inventory of MAX6324AUT46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324AUT46-T is usually 5 days.
3.What payment methods are accepted for MAX6324AUT46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324AUT46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324AUT46-T?
MAX6324AUT46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324AUT46-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 MAX6324AUT46-T?
For technical support, including MAX6324AUT46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324AUT46-T requirements.
6.How does Aetrix verify that MAX6324AUT46-T is sourced from the original manufacturer or authorized distributors?
All MAX6324AUT46-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 MAX6324AUT46-T meets industry standards.
7.What is the process for return or replacement of MAX6324AUT46-T?
All MAX6324AUT46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324AUT46-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 MAX6324AUT46-T part is unused and in its original packaging.
Return procedure for MAX6324AUT46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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