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Analog Devices Inc./Maxim Integrated MAX6323DUT29-T
- Part No.:
- MAX6323DUT29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323DUT29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,643
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Product details
Overview
MAX6323DUT29-T from Maxim Integrated is a microprocessor supervisory IC with windowed (min/max) watchdog, precision reset monitoring at 2.93V ±2.5%, push-pull active-low RESET output, and guaranteed operation down to VCC = +1.2V. It monitors power integrity and processor timing in automotive engine control units, industrial PLCs, and medical infusion pumps.
For engineers reviewing the MAX6323DUT29-T datasheet, MAX6323DUT29-T pinout, MAX6323DUT29-T application, or MAX6323DUT29-T equivalent, key selection criteria include its factory-trimmed 15ms fast / 10s slow watchdog timeout window (suffix D), 2.93V reset threshold, 6-pin SOT23 package, -40°C to +125°C operation, and AEC-Q100-qualified variants.
Technical Context
The MAX6323DUT29-T implements a dual-window watchdog that detects both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >10s), using internal laser-trimmed timing. Its reset comparator guarantees valid RESET assertion down to VCC = +1.2V, with 100ms minimum reset timeout after VCC recovery and MR deassertion.
This device integrates a debounced manual reset input (MR), open-drain watchdog pulse output (WDPO) pulsed low for 1ms on fault detection, and push-pull RESET with VOH ≥0.8×VCC and VOL ≤0.4V at 1.2mA sink - all operating across the full -40°C to +125°C extended temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal ±2.5% (UT29 suffix); ensures reliable brownout detection for 3.0V/3.3V systems |
| Watchdog Fast Timeout | 15ms min / 15ms typ (D-suffix); rejects spurious WDI pulses while detecting stuck-loop execution |
| Watchdog Slow Timeout | 10s max (D-suffix); detects complete processor hang or infinite loop without periodic WDI activity |
| RESET Timeout Delay | 100ms min after VCC rise & MR release; guarantees µP initialization stability during power recovery |
| Supply Current | 23µA typical at 2.5V/3.3V; enables always-on supervision in battery-backed or low-power embedded systems |
| Operating Voltage Range | 1.2V to 5.5V; supports supervision of legacy 2.5V, modern 3.3V, and legacy 5.0V µP rails |
| Temperature Range | -40°C to +125°C; qualified for under-hood automotive, industrial motor drives, and medical equipment |
Pinout & Package
MAX6323DUT29-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.27mm pitch, 2.9mm × 1.6mm footprint, and 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 when held low ≥1µs; immune to 100ns glitches; resets watchdog timer |
| 2 GND | Ground reference | Return path for VCC, RESET, WDPO, WDI; requires low-inductance connection to system ground plane |
| 3 WDI | Watchdog input | Falling-edge-triggered; clears internal watchdog timer; 300ns minimum pulse width; VIH = 0.75×VCC |
| 4 VCC | Supply voltage input | Monitored rail; bypass with ≥500pF capacitor near pin; absolute max 6.0V; functional down to 1.2V |
| 5 WDPO | Open-drain watchdog pulse output | Pulsed low for 1ms on fast/slow fault detection; requires external pullup to ≤6V; inactive when RESET is low |
| 6 RESET | Active-low push-pull reset output | Asserted when VCC < 2.93V or MR low; remains asserted ≥100ms after recovery; VOH ≥0.8×VCC, VOL ≤0.4V |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Detects both premature (fast) and delayed (slow) WDI transitions - critical for safety-critical real-time execution validation |
| Laser-trimmed reset threshold | ±2.5% accuracy at 2.93V eliminates external resistor networks and improves long-term voltage-monitoring reliability |
| Guaranteed RESET validity to 1.2V | Ensures deterministic reset behavior during deep brownout conditions where most µPs lose functionality |
| Debounced MR input | Accepts direct switch connection without external RC network; rejects 100ns transients; simplifies front-panel reset design |
| Low quiescent current | 23µA typical enables continuous supervision in energy-constrained applications such as battery-powered medical devices |
Applications
| Engine Control Unit (ECU) | Programmable Logic Controller (PLC) |
|---|---|
|
Use Scenario: Real-time monitoring of 3.3V microcontroller supply and software execution timing in diesel engine management systems. IC Role / Device Role / Timing Role: Supervises VCC rail and validates µP instruction flow via WDI; asserts RESET on brownout or watchdog timeout; pulses WDPO to trigger NMI-based diagnostics. Use Value: Prevents unsafe engine operation due to µP lockup or undervoltage; meets ISO 26262 ASIL-B timing fault detection requirements. |
Use Scenario: Ensuring deterministic startup and runtime integrity of industrial I/O controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Provides power-on reset, brownout protection, and windowed watchdog supervision of ladder logic execution cycles. Use Value: Eliminates need for external RC reset circuits; reduces BOM count; maintains system availability during voltage sags or EMI-induced µP stalls. |
| Infusion Pump Controller | Railway Signaling Module |
|
Use Scenario: Safety-critical supervision of ARM Cortex-M based drug delivery controller powered from isolated 3.0V DC-DC converter. IC Role / Device Role / Timing Role: Monitors 3.0V rail (2.93V threshold), validates firmware heartbeat via WDI, and forces hard reset on fault via push-pull RESET. Use Value: Meets IEC 62304 Class C software safety requirements; guarantees fail-safe shutdown before incorrect dosing occurs. |
Use Scenario: Supervising FPGA-based interlocking logic in EN 5012x-compliant railway signaling cabinets exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Delivers guaranteed reset assertion over -40°C to +125°C; uses 10s slow watchdog to detect catastrophic firmware hangs. Use Value: Enables SIL-4 compliant system architecture by providing independent hardware-level fault detection outside the FPGA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324DUT29-T | Identical reset threshold (2.93V) and watchdog window (D), but open-drain RESET output instead of push-pull | Required when interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11) or level-shifting across multiple supply domains | Select MAX6324DUT29-T only if open-drain RESET is needed; otherwise MAX6323DUT29-T provides simpler single-supply interface |
| TPS3808G33DBVR | Fixed 3.08V reset threshold (±0.5%), no windowed watchdog (only simple timeout), 350ms reset delay, 1.4µA IQ | Suitable for basic power-on reset in low-power IoT nodes, but lacks min/max watchdog for real-time execution validation | Choose TPS3808G33DBVR only for cost-sensitive, non-safety-critical applications requiring ultra-low IQ and no timing fault detection |
Compared with MAX6324DUT29-T, the MAX6323DUT29-T offers simpler push-pull RESET drive without external pullup; compared with TPS3808G33DBVR, it delivers superior functional safety through windowed watchdog and wider temperature range - essential for automotive and industrial control.
Availability
MAX6323DUT29-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6323DUT29-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 medical applications.
The MAX6323/MAX6324 family was engineered specifically for functional safety-critical µP supervision, combining precision voltage monitoring, windowed watchdog timing, and guaranteed operation across automotive-grade temperature ranges.
FAQ
What is the exact reset threshold voltage of the MAX6323DUT29-T?
The MAX6323DUT29-T has a nominal reset threshold of 2.93V with ±2.5% accuracy over -40°C to +125°C, corresponding to the UT29 suffix per Maxim's ordering nomenclature. This value is laser-trimmed at wafer test and guaranteed in the Electrical Characteristics table (VTH = 2.85V to 3.00V min/max). The MAX6323DUT29-T is optimized for reliable supervision of 3.0V and 3.3V microprocessor rails.
How does the windowed watchdog function in the MAX6323DUT29-T work?
The MAX6323DUT29-T implements a true min/max watchdog: it triggers WDPO on either fast faults (WDI falling edges <15ms apart) or slow faults (no WDI edge >10s), per the D-suffix timing specification. This dual-window detection distinguishes between spurious pulses and complete execution stalls - a capability absent in standard timeout-only supervisors. The MAX6323DUT29-T uses the last WDI falling edge as timing reference and ignores the first pulse after RESET deassertion to prevent false fast faults.
Is the MAX6323DUT29-T compatible with AEC-Q100 automotive qualification?
The MAX6323DUT29-T itself is not explicitly AEC-Q100 qualified per the datasheet; however, the pin-compatible MAX6324HUT44/V+T variant is AEC-Q100 Grade 0 qualified. For automotive use, designers may select the MAX6323DUT29-T with full awareness that qualification applies to specific variants (e.g., /V suffix parts), and must validate system-level compliance independently. The MAX6323DUT29-T shares the same -40°C to +125°C operating range and robust construction required for under-hood deployment.
What is the recommended bypass capacitor for the VCC pin of the MAX6323DUT29-T?
Maxim specifies a minimum 500pF ceramic capacitor placed as close as possible to the VCC pin of the MAX6323DUT29-T to suppress high-frequency noise and ensure stable reset assertion during supply transients. In electrically noisy environments (e.g., motor drives or automotive ECUs), a 100nF X7R capacitor in parallel with the 500pF unit is commonly used. This bypassing prevents false resets caused by VCC glitches and is mandatory for reliable operation per the Typical Operating Circuit and Applications Information sections of the MAX6323DUT29-T datasheet.
Can the MAX6323DUT29-T's WDPO output be directly connected to the MR input for automatic reset on watchdog fault?
Yes - the MAX6323DUT29-T supports WDPO-to-MR loopback: the 1ms low pulse on WDPO asserts MR, which forces RESET to remain active for the full 100ms timeout period. This configuration guarantees a complete µP reset on any watchdog fault, preserving system integrity when software errors corrupt RAM or stall execution. The MAX6323DUT29-T datasheet explicitly illustrates this circuit (Figure 10) and confirms compatibility, noting that WDPO is only active when RESET is high - ensuring proper sequencing.
MAX6323DUT29-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:
- Push-Pull, Totem Pole
- 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
MAX6323DUT29-T FAQ
1.How can I place an order for MAX6323DUT29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323DUT29-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 MAX6323DUT29-T reliable?
The price and inventory of MAX6323DUT29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323DUT29-T is usually 5 days.
3.What payment methods are accepted for MAX6323DUT29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323DUT29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323DUT29-T?
MAX6323DUT29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323DUT29-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 MAX6323DUT29-T?
For technical support, including MAX6323DUT29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323DUT29-T requirements.
6.How does Aetrix verify that MAX6323DUT29-T is sourced from the original manufacturer or authorized distributors?
All MAX6323DUT29-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 MAX6323DUT29-T meets industry standards.
7.What is the process for return or replacement of MAX6323DUT29-T?
All MAX6323DUT29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323DUT29-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 MAX6323DUT29-T part is unused and in its original packaging.
Return procedure for MAX6323DUT29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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