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Analog Devices Inc./Maxim Integrated MAX6323HUT46
- Part No.:
- MAX6323HUT46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323HUT46.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,279
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Product details
Overview
MAX6323HUT46 from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, precision +4.63V reset threshold (±2.5%), 100ms reset timeout delay, and push-pull active-low RESET output - designed for automotive and industrial embedded systems requiring reliable power-on/brownout detection and processor fault monitoring.
For engineers reviewing the MAX6323HUT46 datasheet, MAX6323HUT46 pinout, MAX6323HUT46 application, or MAX6323HUT46 equivalent, key selection criteria include its factory-trimmed 719ms fast watchdog timeout (H-suffix), 1.2V minimum VCC operation, -40°C to +125°C extended temperature range, and SOT23-6 package compatibility with high-noise environments.
Technical Context
The MAX6323HUT46 implements a dual-window watchdog that detects both fast faults (WDI falling edges <719ms apart) and slow faults (no WDI edge >1.3s), with WDPO pulsed low for 1ms on fault detection. Its internal reset comparator guarantees valid RESET assertion down to VCC = +1.2V, independent of supply rail decay rate.
It features a debounced manual reset input (MR) with 1μs minimum pulse width and 100ns glitch immunity, and operates with only 23µA typical supply current at 3.3V - enabling low-power always-on supervision in battery-backed or energy-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +4.63V nominal, ±2.5% accuracy over -40°C to +125°C - ensures stable brownout detection for +5V systems |
| Reset Timeout Delay | 100ms minimum after VCC rise and MR deassertion - provides sufficient hold time for μP initialization |
| Watchdog Fast Timeout | 719ms (H-suffix), min 543ms - defines shortest allowable WDI falling-edge interval before fault trigger |
| Watchdog Slow Timeout | 1.3s (H-suffix), max 1.8s - defines longest allowable gap between WDI falling edges |
| Supply Current | 23µA typical at 3.3V - enables continuous supervision without significant battery drain |
| Operating Voltage Range | 1.2V to 5.5V - supports valid RESET output even during deep brownout conditions |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and harsh industrial environments |
Pinout & Package
MAX6323HUT46 is housed in a 6-pin SOT23 package (package code U6-1), with 1.6mm × 2.9mm footprint and 0.95mm height - optimized for space-constrained PCB layouts in automotive ECUs and industrial controllers.
| 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 - requires no external pullup or debounce circuitry |
| 2 - GND | Ground reference | Common return path for all internal circuits; must be connected directly to system ground plane |
| 3 - WDI | Watchdog input | Falling-edge-triggered; resets internal watchdog timer and disables WDPO assertion - immune to 100ns glitches at VCC = 2.5V |
| 4 - VCC | Supply voltage input | Monitored for reset generation; bypass with ≥500pF capacitor near pin to suppress transients |
| 5 - WDPO | Open-drain watchdog pulse output | Pulsed low for 1ms on fast/slow fault detection; requires external pullup to any supply ≤+6V |
| 6 - RESET | Active-low push-pull reset output | Asserted when VCC <4.63V or MR low; remains asserted ≥100ms after recovery - drives CMOS/TTL loads directly without pullup |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Detects both premature (fast) and delayed (slow) WDI transitions - prevents false resets from jitter while catching hung loops |
| Factory-trimmed thresholds | Laser-trimmed +4.63V reset and 719ms/1.3s watchdog windows - eliminates external resistor networks and calibration |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.2V - ensures deterministic behavior during deep brownout recovery |
| Low-power supervision | 23µA typical ICC enables 10+ year battery life in always-on monitoring applications |
| Debounced MR input | 1μs minimum pulse width and 100ns glitch rejection - allows direct switch connection without RC filters |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Continuous monitoring of main 5V supply and microcontroller activity in engine management systems exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and windowed watchdog supervision of the main MCU's WDI signal. Use Value: Prevents unsafe operation due to software lockup or supply sag by asserting RESET within 100ms of recovery and pulsing WDPO for diagnostic logging. | Use Scenario: Ensuring deterministic startup and runtime integrity of programmable logic controller modules operating in factory-floor environments with noisy 24V DC supplies. IC Role / Device Role / Timing Role: System-level supervisor generating clean reset pulses and detecting out-of-spec WDI timing from the PLC's real-time task scheduler. Use Value: Enables fail-safe shutdown and automatic recovery via WDPO-to-MR loopback, preserving system availability without operator intervention. |
| Medical Infusion Pump Controller | Railway Signaling Interface Board |
Use Scenario: Safety-critical supervision of ARM-based pump controller powered from isolated 3.3V/5V rails, where undetected software hang could cause dosage errors. IC Role / Device Role / Timing Role: Fault-detection IC asserting RESET and WDPO independently - WDPO triggers NMI for error logging while RESET forces full restart. Use Value: Meets IEC 62304 Class C requirements via dual-fault detection (fast/slow WDI) and guaranteed 1.2V reset validity during battery fallback. | Use Scenario: Monitoring legacy microcontroller-based signaling logic in EN 5012x-compliant railway infrastructure, subject to wide ambient temperature (-40°C to +85°C) and conducted transients. IC Role / Device Role / Timing Role: High-reliability supervisor ensuring correct boot sequence and detecting firmware execution anomalies in safety-critical interlocking systems. Use Value: Provides AEC-Q100-aligned robustness (via HUT46's -40°C to +125°C rating) and 100ms reset hold time compliant with EN 50129 SIL-2 timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT46 | Identical reset threshold and watchdog timing, 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 MAX6324HUT46 only if open-drain RESET is needed; otherwise MAX6323HUT46 simplifies design with direct drive capability |
| TPS3808G33DBVR | Fixed +3.3V reset threshold, no windowed watchdog - only basic timeout watchdog with single adjustable delay | Suitable for simpler systems lacking min/max timing fault detection; lacks fast/slow fault discrimination | Choose TPS3808G33DBVR only for cost-sensitive non-safety applications where windowed watchdog is unnecessary |
Compared with MAX6324HUT46, the MAX6323HUT46 offers direct-drive RESET without pullup resistors, reducing BOM count and layout complexity; versus TPS3808G33DBVR, it delivers superior fault coverage via dual-window watchdog and higher reset threshold accuracy for +5V systems.
Availability
MAX6323HUT46 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6323HUT46 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, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6323/MAX6324 product line delivers highly accurate, low-power microprocessor supervision with windowed watchdog functionality - specifically engineered for safety-critical embedded systems where deterministic reset behavior and fault detection integrity are mandatory.
FAQ
What is the exact reset threshold voltage of MAX6323HUT46 and how is it trimmed?
The MAX6323HUT46 has a nominal reset threshold of +4.63V, with guaranteed tolerance of ±2.5% over -40°C to +125°C. This value is laser-trimmed at wafer test and fixed per unit - no external components or calibration are required. The "46" suffix in MAX6323HUT46 explicitly denotes this 4.63V threshold variant per Maxim's ordering nomenclature.
Does MAX6323HUT46 support operation below 1.8V, and what happens to RESET output at low VCC?
Yes, MAX6323HUT46 operates down to VCC = +1.2V, and RESET output remains valid and actively driven throughout this range. Below +1.2V, the RESET output becomes high-impedance (open-circuit), but this is intentional - most μPs are nonfunctional below 1.2V, so maintaining RESET assertion is not required. The datasheet guarantees RESET functionality precisely to +1.2V.
How does the windowed watchdog in MAX6323HUT46 differ from standard timeout watchdogs?
The MAX6323HUT46 implements a true min/max (windowed) watchdog: it triggers WDPO on *both* fast faults (WDI falling edges closer than 719ms) *and* slow faults (no WDI edge longer than 1.3s). Standard timeout watchdogs detect only slow faults. This dual detection prevents false resets from clock jitter while reliably catching hung loops or stalled execution - a critical distinction for safety-critical firmware.
Can MAX6323HUT46 be used with a 3.3V microcontroller, and how is level compatibility ensured?
Yes, MAX6323HUT46 is fully compatible with 3.3V μPs. Its VCC pin accepts 1.2V–5.5V, and its push-pull RESET output drives cleanly to 0V and VCC levels - eliminating level-shifter requirements. WDI input thresholds scale with VCC (VIH = 0.75×VCC), and WDPO is open-drain with 5.5V-tolerant output, allowing flexible pullup to 3.3V or 5V rails without interface circuitry.
What is the purpose of the MR pin on MAX6323HUT46, and does it require external components?
The MR (manual reset) pin on MAX6323HUT46 is an active-low input that immediately asserts RESET and clears the watchdog timer when pulled low. It features an internal pullup (~70kΩ typical) and 100ns glitch immunity, so no external pullup or RC debounce network is needed. A simple momentary switch to ground suffices - simplifying front-panel reset implementation in field-deployed equipment.
MAX6323HUT46 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:
- 4.63V
- 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-23-6
MAX6323HUT46 FAQ
1.How can I place an order for MAX6323HUT46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323HUT46 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 MAX6323HUT46 reliable?
The price and inventory of MAX6323HUT46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323HUT46 is usually 5 days.
3.What payment methods are accepted for MAX6323HUT46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323HUT46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323HUT46?
MAX6323HUT46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323HUT46 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 MAX6323HUT46?
For technical support, including MAX6323HUT46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323HUT46 requirements.
6.How does Aetrix verify that MAX6323HUT46 is sourced from the original manufacturer or authorized distributors?
All MAX6323HUT46 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 MAX6323HUT46 meets industry standards.
7.What is the process for return or replacement of MAX6323HUT46?
All MAX6323HUT46 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323HUT46, 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 MAX6323HUT46 part is unused and in its original packaging.
Return procedure for MAX6323HUT46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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