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Analog Devices Inc./Maxim Integrated MAX6324CUT29-T
- Part No.:
- MAX6324CUT29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324CUT29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,280
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Product details
Overview
MAX6324CUT29-T from Maxim Integrated is a microprocessor supervisory IC with windowed (min/max) watchdog, open-drain RESET output, and factory-trimmed 2.93V reset threshold (±2.5% accuracy). It monitors VCC from +1.2V to +5.5V, asserts RESET low on undervoltage or manual reset, and pulses WDPO low for 1ms upon fast/slow watchdog faults. Used in automotive engine control units for fault-tolerant boot sequencing and runtime integrity monitoring.
For engineers reviewing the MAX6324CUT29-T datasheet, MAX6324CUT29-T pinout, MAX6324CUT29-T application, or MAX6324CUT29-T equivalent, key selection criteria include its -40°C to +125°C operation, SOT23-6 package, 23µA typical supply current, guaranteed RESET validity down to VCC = +1.2V, and laser-trimmed C-window watchdog timeout (10–15ms fast / 300–450ms slow).
Technical Context
The MAX6324CUT29-T implements a dual-threshold windowed watchdog: it detects both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >300ms), triggering a 1ms open-drain WDPO pulse. Its reset comparator guarantees valid active-low RESET assertion down to VCC = +1.2V, with 100ms minimum deassertion delay after VCC recovery and MR release.
This device uses BiCMOS process technology (1371 transistors) and features debounced MR input with 1µs minimum pulse width, 100ns glitch immunity, and internal 50–85kΩ MR pullup. The open-drain RESET output requires an external pullup and supports level-shifting across supply domains up to +6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (2.85–3.00V range), ±2.5% accuracy over -40°C to +125°C - ensures reliable power-on reset for 3.3V systems with margin. |
| Watchdog Fast Timeout | 10–15ms (C-window) - detects software loops executing too rapidly or clock faults causing excessive WDI frequency. |
| Watchdog Slow Timeout | 300–450ms (C-window) - identifies stalled firmware, hung interrupts, or missing WDI pulses during normal operation. |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V - enables always-on supervision in battery-backed or low-power automotive modules. |
| RESET Assertion Delay | ≥100ms after VCC rise above threshold and MR deassertion - meets µP power-up timing requirements for stable initialization. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress test conditions. |
| VCC Range | +1.2V to +5.5V - supports supervision of 1.2V, 1.8V, 2.5V, 3.3V, and 5.0V rails with guaranteed RESET functionality down to 1.2V. |
Pinout & Package
MAX6324CUT29-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), optimized for space-constrained automotive and industrial PCB layouts. 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; must be low-impedance connection to system ground plane. |
| 3 - WDI | Watchdog input | Falling-edge triggered; resets internal watchdog timer; requires ≥300ns pulse width and 0.3×VCC/0.7×VCC logic thresholds. |
| 4 - VCC | Supply voltage input | Monitored rail; bypass with ≥500pF capacitor near pin to suppress noise-induced false resets. |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault detection; requires external pullup to any supply ≤+6V; inactive when RESET is asserted. |
| 6 - RESET | Active-low open-drain reset output | Asserted when VCC <2.93V or MR low; requires external pullup; supports bidirectional µP reset pins and multi-supply level shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed (min/max) watchdog | Dual-fault detection prevents false positives from transient noise while catching both stuck-loop and hung-process failures. |
| Laser-trimmed reset threshold | 2.93V ±2.5% eliminates external resistor networks and improves long-term stability vs. temperature and aging. |
| Guaranteed RESET down to VCC = +1.2V | Ensures deterministic reset state during brownout recovery before µP enters undefined operation. |
| Debounced manual reset input | Eliminates need for external RC filter or Schmitt trigger; accepts direct switch connection with no additional components. |
| Open-drain WDPO and RESET outputs | Enables wired-OR fault signaling and flexible reset domain interfacing across mixed-voltage systems. |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Real-time monitoring of diesel engine ECU during cold start and high-load operation where voltage sags and software hangs risk emission noncompliance. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller supply and validates firmware execution via WDI; asserts RESET on undervoltage and pulses WDPO on timing violations to trigger diagnostic logging. Use Value: Prevents unsafe engine behavior by forcing controlled reboot within 100ms of fault detection, meeting ISO 26262 ASIL-B timing constraints. |
Use Scenario: Ensuring deterministic startup and runtime integrity of distributed I/O modules in factory automation systems exposed to EMI and power fluctuations. IC Role / Device Role / Timing Role: Provides power-on reset for ARM-based controller and continuous watchdog supervision of cyclic task scheduler; WDPO signals faults to central safety PLC without interrupting main control loop. Use Value: Enables zero-downtime recovery via WDPO-triggered MR loopback, avoiding full system reset and preserving communication stack state. |
| Medical Infusion Pump Controller | Railway Signaling Interface |
|
Use Scenario: Supervising safety-critical infusion pump MCU that must maintain precise motor control and alarm response even during AC line disturbances. IC Role / Device Role / Timing Role: Monitors 2.5V logic rail and validates real-time dosing algorithm execution; RESET halts motor drivers on brownout, WDPO initiates audible/visual alert on software anomaly. Use Value: Meets IEC 62304 Class C software requirements by providing independent hardware-level fault detection with <1ms WDPO response latency. |
Use Scenario: Protecting track-side signaling electronics operating in harsh outdoor environments with wide ambient temperature swings and lightning-induced transients. IC Role / Device Role / Timing Role: Supervises 5.0V FPGA configuration supply and verifies watchdog heartbeat from safety-critical firmware; open-drain RESET interfaces directly with legacy relay driver circuits. Use Value: Achieves EN 5012x SIL-2 compliance through guaranteed -40°C to +125°C operation and 100ms minimum reset hold time under worst-case voltage ramp conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT29-T | Same 2.93V reset threshold but H-window watchdog (543–719ms fast / 1.3–1.8s slow) - slower fault detection than C-window. | Suitable for less time-critical applications like HVAC controllers where extended watchdog windows reduce false triggers. | Select MAX6324HUT29-T only if longer watchdog timeouts align with system software cycle times and safety architecture. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no windowed watchdog (single timeout), push-pull RESET, 1.5µA quiescent current - lower power but less fault coverage. | Applicable in cost-sensitive consumer electronics where basic power-on reset suffices and software hang detection is handled elsewhere. | Choose TPS3808G33DBVR for simpler designs lacking watchdog requirements or needing ultra-low ICC; not suitable for ASIL-B or SIL-2 systems. |
Compared with MAX6324CUT29-T, MAX6324HUT29-T trades faster fault response for greater noise immunity in slow-changing systems, while TPS3808G33DBVR reduces complexity and power at the expense of windowed watchdog capability and automotive temperature range.
Availability
MAX6324CUT29-T is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC I/O, medical infusion pumps, and railway signaling applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6324CUT29-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, emphasizing reliability, low power, and high integration.
The MAX6323/MAX6324 family delivers hardware-enforced system integrity for safety-critical µP systems, with focus on AEC-Q100-qualified supervision, windowed watchdogs, and guaranteed operation down to 1.2V supply.
FAQ
What is the exact reset threshold voltage of MAX6324CUT29-T and how is it trimmed?
The MAX6324CUT29-T has a nominal reset threshold of 2.93V, with a guaranteed range of 2.85V to 3.00V (±2.5%) over -40°C to +125°C. This value is set by factory laser trimming of on-chip resistors during final test, eliminating the need for external calibration components and ensuring long-term stability without drift.
Does MAX6324CUT29-T support both fast and slow watchdog fault detection?
Yes, MAX6324CUT29-T implements a true windowed (min/max) watchdog. It detects fast faults when WDI falling edges occur less than 15ms apart and slow faults when no WDI edge is observed for more than 300ms - both conditions trigger a 1ms WDPO pulse, enabling comprehensive runtime software validation.
Can MAX6324CUT29-T operate reliably during brownout conditions down to 1.2V?
Yes, MAX6324CUT29-T guarantees valid active-low RESET assertion down to VCC = +1.2V. Below this voltage, the RESET output becomes high-impedance, but the device continues to monitor and will reassert RESET immediately upon VCC recovery - critical for safe brownout recovery in automotive and industrial systems.
What is the function of the WDPO pin on MAX6324CUT29-T and how should it be used?
The WDPO pin on MAX6324CUT29-T is an open-drain watchdog pulse output that drives low for 1ms upon detection of either fast or slow watchdog faults. It must be pulled up externally to any supply ≤+6V and is commonly used to trigger NMI interrupts, log diagnostic events, or feed back to MR for controlled system reset via the WDPO-to-MR loopback circuit.
Is MAX6324CUT29-T qualified for automotive applications and what standards does it meet?
Yes, MAX6324CUT29-T operates over -40°C to +125°C and is AEC-Q100 qualified (as part of the MAX6324 family). It meets automotive reliability requirements including HTOL, TC, and ESD testing, and is designed for use in engine control, transmission, and ADAS subsystems where functional safety and extended temperature performance are mandatory.
MAX6324CUT29-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:
- 2.93V
- 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
MAX6324CUT29-T FAQ
1.How can I place an order for MAX6324CUT29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324CUT29-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 MAX6324CUT29-T reliable?
The price and inventory of MAX6324CUT29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324CUT29-T is usually 5 days.
3.What payment methods are accepted for MAX6324CUT29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324CUT29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324CUT29-T?
MAX6324CUT29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324CUT29-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 MAX6324CUT29-T?
For technical support, including MAX6324CUT29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324CUT29-T requirements.
6.How does Aetrix verify that MAX6324CUT29-T is sourced from the original manufacturer or authorized distributors?
All MAX6324CUT29-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 MAX6324CUT29-T meets industry standards.
7.What is the process for return or replacement of MAX6324CUT29-T?
All MAX6324CUT29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324CUT29-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 MAX6324CUT29-T part is unused and in its original packaging.
Return procedure for MAX6324CUT29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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