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Analog Devices Inc./Maxim Integrated MAX6323HUT46+T
- Part No.:
- MAX6323HUT46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323HUT46+T.pdf
- Description:
- IC SUPERVISOR 4.63V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,815
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Product details
Overview
MAX6323HUT46+T from Maxim Integrated is a microprocessor supervisory IC with windowed (min/max) watchdog timer, push-pull active-low RESET output, and precision +4.63V reset threshold (±2.5% accuracy). It monitors VCC down to +1.2V, asserts RESET for ≥100ms after power-up, and operates across -40°C to +125°C in automotive and industrial control systems.
For engineers reviewing the MAX6323HUT46+T datasheet, MAX6323HUT46+T pinout, MAX6323HUT46+T application, or MAX6323HUT46+T equivalent, key selection criteria include its factory-trimmed 719ms fast watchdog timeout (H-suffix), 1.3s slow timeout, debounced manual reset input, low 23µA typical supply current, and guaranteed RESET validity at VCC = +1.2V.
Technical Context
The MAX6323HUT46+T implements a dual-window watchdog architecture: it detects both fast faults (WDI falling edges <719ms apart) and slow faults (no WDI edge >1.3s), pulsing WDPO low for 1ms per fault. Its internal reset comparator guarantees monotonic behavior with ±2.5% threshold accuracy over temperature.
VCC monitoring uses a precision bandgap reference and hysteresis-free comparator; RESET remains asserted until VCC exceeds 4.63V and holds for ≥100ms post-threshold crossing. The MR input features internal 85kΩ pullup, 1µs minimum pulse width, and 100ns glitch immunity - enabling direct switch interface without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +4.63V nominal (4.50V–4.75V range), ±2.5% accuracy ensures reliable brownout detection for +5V systems |
| Watchdog Fast Timeout | 719ms (H-suffix), defines minimum allowable WDI pulse interval to avoid false fast-fault triggers |
| Watchdog Slow Timeout | 1.3s (H-suffix), sets maximum allowed time between WDI falling edges before WDPO fault pulse |
| RESET Assertion Delay | ≥100ms after VCC rise above threshold, guarantees µP initialization completes before release |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V, enables battery-backed or ultra-low-power embedded operation |
| Operating Temperature | -40°C to +125°C, qualified for under-hood automotive and harsh industrial environments |
| VCC Range | +1.2V to +5.5V, supports valid RESET assertion even during deep brownout conditions |
Pinout & Package
MAX6323HUT46+T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.3mm × 2.2mm footprint and 0.95mm height - suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internally pulled up to VCC (85kΩ); asserts RESET and clears watchdog on falling edge; requires ≥1µs pulse width |
| 2 - GND | Ground reference | Return path for all internal circuitry; must be connected directly to system ground plane |
| 3 - WDI | Watchdog input | Falling-edge-triggered; resets internal watchdog timer; 300ns minimum pulse width required |
| 4 - VCC | Supply voltage input | Power source and monitored rail; bypass with ≥500pF capacitor near pin for noise immunity |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault detection; requires external pullup to ≤+6V supply |
| 6 - RESET | Push-pull active-low reset output | Drives low during fault/brownout; no external pullup needed; sinks current down to VCC = +1.2V |
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 thresholds | Fixed 4.63V reset and H-suffix (719ms/1.3s) watchdog windows eliminate external component tuning and calibration |
| Debounced MR input | Internal 100ns glitch rejection and 1µs minimum pulse width allow direct mechanical switch connection without RC network |
| Low-voltage RESET validity | Guaranteed RESET assertion down to VCC = +1.2V prevents undefined µP state during deep brownout recovery |
| Extended temperature operation | -40°C to +125°C rating supports deployment in engine control units, motor drives, and industrial PLCs |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 5V supply and main MCU activity in diesel/gasoline ECU modules exposed to under-hood thermal cycling and electrical noise. IC Role / Device Role / Timing Role: Provides power-on reset, brownout protection, and windowed watchdog supervision of engine timing firmware loops. Use Value: Prevents runaway code execution due to EMI-induced instruction corruption by detecting out-of-window WDI pulses and forcing safe shutdown via RESET. |
Use Scenario: Ensures deterministic startup and runtime integrity of ladder-logic processors in factory automation cabinets with variable 24VDC input. IC Role / Device Role / Timing Role: Delivers stable reset signaling during 24V-to-5V conversion transients and validates cyclic scan execution timing. Use Value: Guarantees ≥100ms RESET hold time after power stabilization, eliminating spurious restarts during line sags common in industrial power distribution. |
| Medical Infusion Pump Controller | Railway Signaling Interface Module |
Use Scenario: Supervises ARM-based controller in Class II medical infusion pumps requiring IEC 62304 compliance and fail-safe dose delivery. IC Role / Device Role / Timing Role: Enforces strict timing windows on motor-control task execution and triggers watchdog pulse (WDPO) for diagnostic logging prior to hard reset. Use Value: Enables traceable fault reporting via WDPO pulse to host MCU - satisfying diagnostic coverage requirements for SIL-2 functional safety targets. |
Use Scenario: Secures FPGA-based track-side signaling logic operating in EN 5012x-certified railway infrastructure with wide ambient temperature swings. IC Role / Device Role / Timing Role: Validates real-time communication stack heartbeat and provides tamper-resistant reset assertion during voltage dips from traction power coupling. Use Value: Maintains RESET assertion down to VCC = +1.2V, ensuring controlled shutdown even during severe 5V rail collapse caused by electromagnetic interference from passing trains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT46+T | Open-drain RESET output instead of push-pull; identical reset threshold, watchdog timing, and pinout | Required when interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11) or level-shifting across multiple supply domains | Select MAX6324HUT46+T only if open-drain drive is needed; otherwise MAX6323HUT46+T simplifies design with no pullup resistor |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, single-window watchdog (not min/max), 200ms reset timeout, 1.8V–6.0V VCC range | Suitable for cost-sensitive 3.3V systems without stringent dual-window watchdog requirements | Choose TPS3808G33DBVR only for non-safety-critical 3.3V applications where windowed watchdog functionality is unnecessary |
Compared with MAX6323HUT46+T, MAX6324HUT46+T offers identical supervision capability but requires an external RESET pullup, while TPS3808G33DBVR lacks min/max watchdog detection and has lower reset threshold accuracy - making MAX6323HUT46+T the only option meeting AEC-Q100-aligned automotive and SIL-2 medical timing integrity requirements.
Availability
MAX6323HUT46+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6323HUT46+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 semiconductor solutions for demanding industrial, automotive, and medical applications.
The MAX6323/MAX6324 family delivers precision power-supply monitoring and windowed watchdog supervision specifically for safety-critical embedded systems where deterministic reset behavior and firmware execution validation are mandatory.
FAQ
What is the exact reset threshold voltage of MAX6323HUT46+T?
The MAX6323HUT46+T has a nominal reset threshold of +4.63V, with guaranteed limits of +4.50V (minimum) and +4.75V (maximum) across -40°C to +125°C. This 4.63V specification matches standard +5V supply rails and provides ±2.5% accuracy for reliable brownout detection in automotive and industrial applications.
How does the windowed watchdog function in MAX6323HUT46+T?
The MAX6323HUT46+T implements a true min/max watchdog: it triggers WDPO on either fast faults (WDI falling edges <719ms apart) or slow faults (no WDI edge >1.3s). This dual-window detection prevents both premature resets from noisy timing and dangerous hangs from stalled firmware - a capability not found in standard single-window supervisors.
Is MAX6323HUT46+T compatible with 3.3V microcontrollers?
Yes, MAX6323HUT46+T operates from VCC = +1.2V to +5.5V and interfaces directly with 3.3V µPs. Its RESET output is push-pull and valid down to VCC = +1.2V, while WDI and MR inputs accept 0.3×VCC to 0.7×VCC logic thresholds - ensuring robust signal compatibility across mixed-voltage systems.
What is the purpose of the WDPO pin on MAX6323HUT46+T?
The WDPO (watchdog pulse output) pin on MAX6323HUT46+T provides a 1ms open-drain pulse upon detection of any watchdog fault - independent of the main RESET signal. This allows diagnostic logging, NMI triggering, or WDPO-to-MR loopback for controlled reset sequencing without losing the original fault signature.
Does MAX6323HUT46+T require external passive components for basic operation?
No, MAX6323HUT46+T requires no external resistors or capacitors for core functionality: MR is internally pulled up, RESET is push-pull, and VCC bypassing needs only a ≥500pF capacitor (recommended but not strictly mandatory for noise immunity). This reduces BOM count and improves reliability in space-constrained designs.
MAX6323HUT46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- 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-6
MAX6323HUT46+T FAQ
1.How can I place an order for MAX6323HUT46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323HUT46+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 MAX6323HUT46+T reliable?
The price and inventory of MAX6323HUT46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323HUT46+T is usually 5 days.
3.What payment methods are accepted for MAX6323HUT46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323HUT46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323HUT46+T?
MAX6323HUT46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323HUT46+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 MAX6323HUT46+T?
For technical support, including MAX6323HUT46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323HUT46+T requirements.
6.How does Aetrix verify that MAX6323HUT46+T is sourced from the original manufacturer or authorized distributors?
All MAX6323HUT46+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 MAX6323HUT46+T meets industry standards.
7.What is the process for return or replacement of MAX6323HUT46+T?
All MAX6323HUT46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323HUT46+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 MAX6323HUT46+T part is unused and in its original packaging.
Return procedure for MAX6323HUT46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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