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Analog Devices Inc./Maxim Integrated MAX6324AUT31+T
- Part No.:
- MAX6324AUT31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324AUT31+T.pdf
- Description:
- IC MPU/RESET CIRC 3.08V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,323
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Product details
Overview
MAX6324AUT31+T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, open-drain RESET output, and factory-trimmed 3.08V reset threshold (±2.5% accuracy). It monitors +3.3V power supplies in automotive and industrial control systems, asserts RESET low on VCC drop or manual reset, and guarantees valid RESET down to VCC = +1.2V.
For engineers reviewing the MAX6324AUT31+T datasheet, MAX6324AUT31+T pinout, MAX6324AUT31+T application, or MAX6324AUT31+T equivalent, key selection factors include its 3.00–3.15V reset threshold range, 15ms fast/300ms slow watchdog timeout options (suffix 'A'), 23µA typical supply current, and SOT23-6 open-drain interface compatibility with bidirectional µP reset pins.
Technical Context
The MAX6324AUT31+T implements a dual-window watchdog that detects both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >300ms), with WDPO pulsed low for 1ms upon fault detection. Its reset comparator guarantees monotonic behavior across -40°C to +125°C and maintains valid output down to VCC = +1.2V.
It features a debounced manual reset input (MR) with 1µs minimum pulse width and 100ns glitch immunity, internally pulled up to VCC. The open-drain RESET output requires an external pullup resistor and supports level-shifting across supply domains up to +6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V to 3.15V (nominal 3.08V, ±2.5% accuracy over temperature) |
| Watchdog Fast Timeout | 15ms (factory-trimmed option 'A'; detects WDI pulses too close together) |
| Watchdog Slow Timeout | 300ms (factory-trimmed option 'C'; detects missing WDI pulses) |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V; enables ultra-low-power embedded monitoring |
| RESET Assertion Delay | ≥100ms after VCC rises above threshold and MR deasserts; ensures stable µP startup |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and harsh industrial environments |
| VCC Range | 1.2V to 5.5V; RESET remains valid down to 1.2V, critical for brownout recovery |
Pinout & Package
MAX6324AUT31+T is housed in a 6-pin SOT23 package (package code U6+1A), footprint compatible with JEDEC MO-178AA, 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 path for all internal circuitry and external bypass capacitors (≥500pF on VCC) |
| 3 - WDI | Watchdog input | Falling-edge triggered; resets internal timer; requires ≥300ns pulse width; ignored during RESET/WDPO assertion |
| 4 - VCC | Supply voltage input | Monitored for reset generation; supports 1.2V–5.5V operation; bypass with ≥500pF capacitor for noise immunity |
| 5 - WDPO | Open-drain watchdog pulse output | Pulsed low for 1ms on fast/slow fault detection; requires external pullup; active only when RESET is high |
| 6 - RESET | Active-low open-drain reset output | Asserted when VCC < VTH 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 (fast) and delayed (slow) WDI transitions-critical for safety-critical firmware execution validation |
| Factory-trimmed precision reset | 3.08V threshold with ±2.5% tolerance across -40°C to +125°C eliminates external resistor calibration |
| Open-drain RESET & WDPO | Enables direct interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11) and multi-supply level shifting |
| Debounced MR input | Internal pullup and 100ns glitch rejection allow direct switch connection without external RC network |
| Low-power operation | 23µA typical ICC supports always-on monitoring in battery-backed or energy-constrained systems |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.2V-ensures deterministic behavior during deep brownout conditions |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply and validates firmware execution timing in engine management software. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and windowed watchdog supervision of main µP. Use Value: Prevents unsafe operation due to stuck loops or clock faults by triggering WDPO pulse and full 100ms RESET assertion via MR loopback. |
Use Scenario: Ensures reliable startup and runtime integrity of programmable logic controller modules operating in noisy factory environments. IC Role / Device Role / Timing Role: Dual-role supervisor: VCC monitor for 3.3V FPGA configuration supply and watchdog timer for real-time control task scheduler. Use Value: 300ms slow watchdog timeout aligns with deterministic scan cycle timing; open-drain RESET interfaces cleanly with isolated µP reset domains. |
| Medical Infusion Pump Controller | Embedded Telematics Gateway |
|
Use Scenario: Provides fail-safe reset and watchdog supervision for ARM-based pump controller running safety-critical dosing algorithms. IC Role / Device Role / Timing Role: Safety-redundant supervisor asserting RESET on VCC anomaly and pulsing WDPO on firmware timing deviation. Use Value: Valid RESET down to 1.2V ensures controlled shutdown during battery depletion; AEC-Q100-compatible variant available for certified designs. |
Use Scenario: Manages power sequencing and runtime health of cellular modem and CAN controller subsystems in vehicle telematics units. IC Role / Device Role / Timing Role: Central supervisory node coordinating reset propagation and watchdog fault signaling across multiple voltage domains. Use Value: Open-drain WDPO can drive NMI input of host processor for non-maskable error handling; RESET pullup to 5V domain enables cross-rail reset coordination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT31+T | Same 3.08V reset threshold but H-suffix watchdog: 719ms fast / 1.3s slow timeout | Suitable for longer-loop applications (e.g., HVAC controllers); not interchangeable without firmware timing update | Select when extended watchdog windows are required; verify WDI pulse interval compliance |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no windowed watchdog (standard timeout only), 2.5µA quiescent current | Lacks min/max watchdog capability; used where simple power-good monitoring suffices | Choose for ultra-low-power, non-safety-critical applications without complex firmware timing validation needs |
Compared with MAX6324AUT31+T, MAX6324HUT31+T extends watchdog timing for slower control loops but requires matching firmware intervals, while TPS3808G33DBVR reduces power consumption by 90% but sacrifices windowed fault detection-making it unsuitable for ASIL-B or SIL-2 systems requiring dual-fault coverage.
Availability
MAX6324AUT31+T is available at Aetrix Electronics and suitable for automotive ECU, industrial PLC, medical infusion pump, and embedded telematics applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for MAX6324AUT31+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 product line delivers robust µP supervision with windowed watchdog functionality specifically engineered for safety-critical embedded systems requiring deterministic fault detection and guaranteed reset behavior across extreme temperatures.
FAQ
What is the exact reset threshold voltage of MAX6324AUT31+T?
The MAX6324AUT31+T has a factory-trimmed reset threshold of 3.00V (min), 3.08V (typ), and 3.15V (max) at -40°C to +125°C, with ±2.5% accuracy. This corresponds to the '31' suffix in the part number and is optimized for monitoring +3.3V power rails in automotive and industrial systems.
Does MAX6324AUT31+T support windowed watchdog functionality?
Yes, MAX6324AUT31+T implements a true min/max (windowed) watchdog: it detects both fast faults (WDI falling edges closer than 15ms) and slow faults (no WDI edge longer than 300ms), per its 'A' and 'C' watchdog suffixes. This dual-window capability distinguishes it from standard timeout-only supervisors.
Can MAX6324AUT31+T be used with a 5V microcontroller reset pin?
Yes, MAX6324AUT31+T's open-drain RESET output supports level shifting: connect the external pullup resistor to +5V (or any supply up to +6V), while VCC is powered from +3.3V. This allows clean reset assertion across voltage domains without level translators.
What is the minimum VCC voltage at which MAX6324AUT31+T guarantees valid RESET output?
MAX6324AUT31+T guarantees valid RESET output down to VCC = +1.2V. Below this, the internal output stage cannot sink current reliably. This specification ensures deterministic reset behavior during deep brownout conditions common in automotive stop-start systems.
How does the manual reset (MR) input behave on MAX6324AUT31+T?
The MR input on MAX6324AUT31+T is active-low, internally pulled up to VCC, and requires ≥1µs low pulse width to assert RESET. It is debounced with 100ns glitch immunity, allowing direct switch connection without external components. After MR release, RESET remains asserted for ≥100ms.
MAX6324AUT31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX6324AUT31+T FAQ
1.How can I place an order for MAX6324AUT31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324AUT31+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 MAX6324AUT31+T reliable?
The price and inventory of MAX6324AUT31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324AUT31+T is usually 5 days.
3.What payment methods are accepted for MAX6324AUT31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324AUT31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324AUT31+T?
MAX6324AUT31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324AUT31+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 MAX6324AUT31+T?
For technical support, including MAX6324AUT31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324AUT31+T requirements.
6.How does Aetrix verify that MAX6324AUT31+T is sourced from the original manufacturer or authorized distributors?
All MAX6324AUT31+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 MAX6324AUT31+T meets industry standards.
7.What is the process for return or replacement of MAX6324AUT31+T?
All MAX6324AUT31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324AUT31+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 MAX6324AUT31+T part is unused and in its original packaging.
Return procedure for MAX6324AUT31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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