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Analog Devices Inc./Maxim Integrated MAX6323HUT29-T
- Part No.:
- MAX6323HUT29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323HUT29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,468
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Product details
Overview
MAX6323HUT29-T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, push-pull RESET output, and factory-trimmed 2.93V reset threshold (±2.5% accuracy). It monitors +2.85V to +3.00V supplies in automotive and industrial control systems, asserts RESET down to VCC = +1.2V, and provides 1ms WDPO fault pulses on watchdog timeout violations.
For engineers reviewing the MAX6323HUT29-T datasheet, MAX6323HUT29-T pinout, MAX6323HUT29-T application, or MAX6323HUT29-T equivalent, key selection criteria include its H-window slow watchdog timeout (1.3s), guaranteed 100ms reset delay after power-up, ±2.5% voltage threshold accuracy over –40°C to +125°C, and SOT23-6 package compatibility with high-reliability embedded designs.
Technical Context
The MAX6323HUT29-T implements a dual-threshold windowed watchdog: fast timeout (719ms typ) triggers on WDI falling edges too close together, while slow timeout (1.3s typ) triggers on missing WDI edges beyond the window. Its internal reset comparator guarantees valid RESET assertion even as VCC decays to +1.2V, enabling robust brownout detection in noisy environments.
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 push-pull RESET output drives logic directly without external pullup, supporting systems requiring deterministic reset timing independent of external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (2.85V–3.00V range), ±2.5% accuracy ensures precise +3.3V supply monitoring without external calibration. |
| Reset Timeout Delay | 100ms minimum after VCC rise and MR deassertion - guarantees stable processor initialization before code execution. | Watchdog Slow Timeout | 1.3s typical (1.3–1.8s max) - enables long-duration software loop validation in safety-critical firmware. |
| Supply Current | 23µA typical at 2.5V/3.3V - supports ultra-low-power operation in battery-backed or energy-constrained systems. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control applications. |
| VCC Range | 1.2V to 5.5V - allows valid RESET assertion during deep brownout conditions where most µPs are nonfunctional. |
| WDPO Pulse Width | 1ms typical - provides unambiguous fault indication compatible with NMI inputs or diagnostic logging circuits. |
Pinout & Package
MAX6323HUT29-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 and clears watchdog timer when low ≥1μs; immune to 100ns glitches. |
| 2 - GND | Ground reference | Common return for all internal circuitry; requires low-impedance connection to minimize noise coupling into reset comparator. |
| 3 - WDI | Watchdog input | Falling-edge-triggered; resets internal watchdog timer; 300ns minimum pulse width required for reliable detection. |
| 4 - VCC | Supply voltage input | Monitored for reset generation; bypass with ≥500pF capacitor near pin to suppress transients and ensure clean power-on behavior. |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow watchdog fault; requires external pullup to ≤+6V; inactive when RESET is asserted. |
| 6 - RESET | Active-low push-pull reset output | Drives low without external components; remains asserted ≥100ms after VCC > VTH and MR high; valid down to VCC = +1.2V. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed (min/max) watchdog | Simultaneously detects both stuck-loop (fast timeout) and hung-code (slow timeout) faults - eliminates single-threshold blind spots in firmware monitoring. |
| Factory-trimmed reset threshold | 2.93V ±2.5% accuracy across –40°C to +125°C - removes need for external resistor dividers or calibration in production systems. |
| Guaranteed RESET validity to VCC = +1.2V | Ensures deterministic reset state even during severe brownout - prevents undefined µP behavior when supply collapses below typical logic thresholds. |
| Debounced manual reset input | Internal 50–85kΩ pullup and 100ns glitch rejection enable direct switch connection without RC networks - reduces BOM count and layout area. |
| Low quiescent current | 23µA typical at 3.3V - extends battery life in always-on monitoring applications such as telematics or remote sensors. |
| Automotive-grade temperature range | –40°C to +125°C operation with AEC-Q100-aligned qualification - supports deployment in engine control, ADAS, and body electronics modules. |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply and validates real-time firmware execution in diesel engine management systems. IC Role / Device Role / Timing Role: Provides power-on reset, brownout protection, and windowed watchdog supervision of main µP's WDI signal. Use Value: Prevents unsafe engine operation due to hung firmware by triggering 1ms WDPO pulse → NMI or 100ms RESET assertion, ensuring fail-safe shutdown within defined timing bounds. |
Use Scenario: Ensures reliable startup and runtime integrity of programmable logic controller CPU boards operating in factory automation environments. IC Role / Device Role / Timing Role: Generates clean reset pulse on power-up and continuously verifies µP activity via WDI interface with 1.3s slow timeout window. Use Value: Eliminates need for external reset supervisor ICs and discrete watchdog timers - reduces component count while meeting IEC 61508 SIL-2 functional safety requirements. |
| Medical Infusion Pump Controller | Railway Signaling Interface Board |
|
Use Scenario: Supervises safety-critical ARM-based controller in battery-powered infusion pumps where firmware correctness directly impacts patient safety. IC Role / Device Role / Timing Role: Delivers guaranteed RESET assertion down to VCC = +1.2V and detects abnormal WDI timing using H-window configuration. Use Value: Enables compliance with ISO 13485 and IEC 62304 through deterministic fault response - WDPO pulse initiates alarm logging before full system reset occurs. |
Use Scenario: Protects track-side signaling logic from undetected software lockups in harsh railway environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Acts as primary supervisory circuit for dual-redundant µPs, asserting RESET on supply drop and pulsing WDPO on missed WDI edges. Use Value: Supports EN 5012x certification by providing traceable fault detection (WDPO pulse) and hard reset (RESET) with 100ms minimum hold time - critical for fail-safe interlocking logic. |
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 reset threshold (2.93V) and watchdog window (H), 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 MAX6324HUT29-T only if open-drain RESET is needed; otherwise MAX6323HUT29-T simplifies design with no external pullup. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold (±0.5%), no windowed watchdog - only basic min-timeout watchdog and power-on reset. | Suitable for cost-sensitive consumer applications where advanced fault detection is unnecessary and tighter voltage tolerance is acceptable. | Choose TPS3808G33DBVR only for non-safety-critical designs lacking watchdog timing window requirements; MAX6323HUT29-T provides superior fault coverage. |
Compared with MAX6324HUT29-T, MAX6323HUT29-T eliminates external RESET pullup components and simplifies PCB routing; compared with TPS3808G33DBVR, it delivers unique windowed watchdog functionality essential for detecting both fast and slow firmware anomalies in mission-critical systems.
Availability
MAX6323HUT29-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and railway signaling interface boards requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6323HUT29-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 integration.
The MAX6323/MAX6324 family was developed specifically for high-integrity microprocessor supervision in safety-critical systems, combining precision voltage monitoring, windowed watchdog timing, and extended temperature operation in minimal SOT23 packaging.
FAQ
What is the exact reset threshold voltage of MAX6323HUT29-T?
The MAX6323HUT29-T has a factory-trimmed nominal reset threshold of 2.93V, with guaranteed range of 2.85V to 3.00V (±2.5% accuracy) across –40°C to +125°C. This value is laser-trimmed during production and does not require external calibration. The "29" suffix in MAX6323HUT29-T explicitly denotes this 2.93V threshold variant.
Does MAX6323HUT29-T support windowed watchdog functionality?
Yes, MAX6323HUT29-T implements true windowed (min/max) watchdog supervision. Its H-suffix configuration provides 719ms typical fast timeout and 1.3s typical slow timeout - detecting both abnormally frequent and abnormally infrequent WDI falling edges. This dual-threshold capability is confirmed in the Watchdog Timeout table and Figure 1 of the official datasheet.
What is the RESET output type of MAX6323HUT29-T?
MAX6323HUT29-T features a push-pull RESET output, meaning it actively drives both high and low states without requiring an external pullup resistor. This differs from the MAX6324 series, which uses open-drain RESET. The push-pull architecture simplifies interface with standard CMOS inputs and ensures fast, deterministic reset release timing.
Can MAX6323HUT29-T operate reliably at low supply voltages?
Yes, MAX6323HUT29-T guarantees valid RESET assertion down to VCC = +1.2V, and operates across 1.2V to 5.5V. Below +1.2V, the RESET output becomes high-impedance, but the device continues to monitor VCC and assert RESET as soon as VCC rises above the 2.93V threshold. This behavior is explicitly specified in the Electrical Characteristics table.
What package and pinout does MAX6323HUT29-T use?
MAX6323HUT29-T uses a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175) with standardized pinout: Pin 1 = MR, Pin 2 = GND, Pin 3 = WDI, Pin 4 = VCC, Pin 5 = WDPO, Pin 6 = RESET. This pin assignment is identical across all MAX6323 variants and is verified in the Pin Configuration diagram and Pin Description section of the datasheet.
MAX6323HUT29-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
MAX6323HUT29-T FAQ
1.How can I place an order for MAX6323HUT29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323HUT29-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 MAX6323HUT29-T reliable?
The price and inventory of MAX6323HUT29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323HUT29-T is usually 5 days.
3.What payment methods are accepted for MAX6323HUT29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323HUT29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323HUT29-T?
MAX6323HUT29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323HUT29-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 MAX6323HUT29-T?
For technical support, including MAX6323HUT29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323HUT29-T requirements.
6.How does Aetrix verify that MAX6323HUT29-T is sourced from the original manufacturer or authorized distributors?
All MAX6323HUT29-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 MAX6323HUT29-T meets industry standards.
7.What is the process for return or replacement of MAX6323HUT29-T?
All MAX6323HUT29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323HUT29-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 MAX6323HUT29-T part is unused and in its original packaging.
Return procedure for MAX6323HUT29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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