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Analog Devices Inc./Maxim Integrated MAX6323AUT46-T
- Part No.:
- MAX6323AUT46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323AUT46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,878
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Product details
Overview
MAX6323AUT46-T from Maxim Integrated is a push-pull-output microprocessor supervisory circuit with windowed (min/max) watchdog, 4.63V ±2.5% reset threshold, 100ms minimum reset timeout, and operation from 1.2V to 5.5V supply. It monitors VCC and µP activity in automotive engine control units, ensuring safe restart after brownout or software hang.
For engineers reviewing the MAX6323AUT46-T datasheet, MAX6323AUT46-T pinout, MAX6323AUT46-T application, or MAX6323AUT46-T equivalent, key selection criteria include its factory-trimmed 4.63V reset threshold, A-suffix fast watchdog timeout (1.5ms min / 10ms max), push-pull RESET output, guaranteed operation down to VCC = +1.2V, and AEC-Q100-compatible SOT23-6 package.
Technical Context
The MAX6323AUT46-T implements a dual-window watchdog that detects both fast faults (WDI falling edges closer than 1.5ms) and slow faults (no WDI edge for >10ms), with WDPO pulsed low for 1ms on fault detection. Its internal reset comparator guarantees valid RESET assertion down to VCC = +1.2V, independent of temperature drift.
It features a debounced manual reset input (MR) with 1µs minimum pulse width and 100ns glitch immunity, and operates across –40°C to +125°C. The push-pull RESET output drives logic directly without external pullup, unlike open-drain variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% - precisely matches +5.0V rail monitoring with margin against noise-induced false resets |
| Reset Timeout Delay | 100ms minimum - ensures µP completes power-up initialization before release from reset |
| Watchdog Fast Timeout | 1.5ms (min) / 10ms (max) - detects tight-loop execution errors or clock faults in real-time control firmware |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining valid RESET signal integrity |
| Quiescent Current | 23µA typical at 3.3V - enables always-on supervision in battery-backed automotive modules |
| Operating Temperature | –40°C to +125°C - qualified for under-hood engine control and transmission control applications |
| RESET Output Type | Push-pull - eliminates need for external pullup resistor, simplifying PCB layout and reducing BOM count |
Pinout & Package
Package: 6-pin SOT23 (U6+1A), footprint per JEDEC MO-178AA, 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 pulled low ≥1µs; immune to 100ns glitches |
| 2 GND | Ground reference | Common return path for all internal circuits; 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 rejects <100ns noise |
| 4 VCC | Supply voltage input | Monitored rail; bypass with ≥500pF capacitor near pin to suppress transients and ensure reliable reset assertion |
| 5 WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow watchdog fault; requires external pullup to any supply ≤+6V; active only when RESET is high |
| 6 RESET | Active-low push-pull reset output | Drives µP reset pin directly; sinks current during assertion, sources current during deassertion; no external pullup needed |
Key Features
| Feature | Design Value |
|---|---|
| Windowed (min/max) watchdog | Detects both premature and delayed WDI pulses-critical for safety-critical firmware validation in automotive ECUs |
| Factory-trimmed 4.63V reset threshold | ±2.5% accuracy over –40°C to +125°C-enables precise +5.0V rail supervision without external calibration |
| Guaranteed RESET validity to VCC = +1.2V | Ensures deterministic reset state even during severe brownout, preventing undefined µP behavior |
| Debounced MR input | Eliminates need for external RC filter or Schmitt trigger-reduces component count and board space |
| Low 23µA quiescent current | Supports continuous supervision in always-on vehicle subsystems without compromising battery life |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
|
Use Scenario: Monitors 5V microcontroller supply and validates firmware execution timing in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and windowed watchdog supervision of main MCU. Use Value: Prevents unsafe engine operation due to software lockup or voltage sag by forcing controlled restart within 100ms. |
Use Scenario: Ensures fail-safe behavior in automatic transmission controllers exposed to wide temperature and EMI stress. IC Role / Device Role / Timing Role: Resets transmission MCU and pulses WDPO on timing violations to trigger diagnostic logging before full system reset. Use Value: Enables rapid fault isolation via WDPO pulse while guaranteeing clean µP restart-meeting ASIL-B functional safety requirements. |
| Body Control Module (BCM) | Advanced Driver Assistance Systems (ADAS) Power Sequencer |
|
Use Scenario: Provides robust reset supervision for low-power BCMs managing door locks, lighting, and HVAC in parked vehicles. IC Role / Device Role / Timing Role: Push-pull RESET output drives multiple downstream logic devices; MR input accepts direct switch connection. Use Value: Eliminates external pullup resistors and reduces standby current-extending battery life in key-off scenarios. |
Use Scenario: Coordinates power-up sequencing and runtime supervision of radar/ camera SoCs requiring strict timing margins. IC Role / Device Role / Timing Role: Monitors primary 3.3V domain and uses WDPO to signal timing faults to host processor without interrupting power rails. Use Value: Delivers early warning of firmware anomalies via WDPO pulse while maintaining uninterrupted power to safety-critical sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324AUT46-T | Identical reset threshold (4.63V) and watchdog timeout (A-suffix), but open-drain RESET output | Requires external pullup resistor; supports bidirectional reset pins and level-shifting across supply domains | Select when interfacing with µPs having bidirectional reset inputs (e.g., legacy 68HC11) or multi-rail reset distribution |
| MAX6323HUT46-T | Same 4.63V reset threshold, but H-suffix watchdog (719ms fast / 1.3s slow timeout) instead of A-suffix (1.5ms / 10ms) | Designed for slower-executing firmware or less time-critical applications where tighter watchdog windows are unnecessary | Select for non-safety-critical industrial controllers where extended watchdog response time improves tolerance to transient code delays |
Compared with MAX6324AUT46-T, the MAX6323AUT46-T eliminates pullup components and simplifies layout, while MAX6323HUT46-T trades faster fault detection for greater timing flexibility-making the original part optimal for high-integrity automotive control loops demanding sub-10ms watchdog responsiveness.
Availability
MAX6323AUT46-T is available at Aetrix Electronics and suitable for automotive engine control, transmission management, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6323AUT46-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 automotive, industrial, and communications applications, with emphasis on reliability and performance under harsh conditions.
The MAX6323/MAX6324 family delivers AEC-Q100-qualified µP supervision with windowed watchdog functionality, targeting safety-critical automotive control systems where deterministic reset and fault detection are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6323AUT46-T?
The MAX6323AUT46-T has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% (4.50V to 4.75V) over the full –40°C to +125°C operating range. This value is laser-trimmed during production and specified in the Electrical Characteristics table of the official datasheet.
Does the MAX6323AUT46-T support operation below 2.5V supply voltage?
Yes, the MAX6323AUT46-T operates from 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.2V. Below this voltage, the RESET output becomes high-impedance, but the device remains functional through full brownout recovery-critical for automotive start-stop systems.
What watchdog timeout window does the 'A' suffix indicate in MAX6323AUT46-T?
The 'A' suffix in MAX6323AUT46-T specifies the fastest factory-trimmed watchdog window: fast timeout of 1.5ms (minimum) and slow timeout of 10ms (maximum). This enables detection of tight-loop software faults in real-time control applications such as engine ignition timing.
How does the push-pull RESET output of MAX6323AUT46-T differ from open-drain alternatives?
The MAX6323AUT46-T's push-pull RESET output actively drives both high and low states, eliminating the need for an external pullup resistor. This reduces BOM cost, saves PCB area, and avoids potential weak-high issues in noisy environments-unlike open-drain variants like MAX6324AUT46-T.
Is the MAX6323AUT46-T qualified for automotive use?
The MAX6323AUT46-T is not explicitly AEC-Q100 qualified-the /V suffix (e.g., MAX6324HUT44/V+T) denotes automotive qualification. However, it shares the same –40°C to +125°C operating range, BiCMOS process, and SOT23-6 package used in qualified versions, and is widely deployed in Tier-1 automotive modules with customer-specific qualification.
MAX6323AUT46-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:
- 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
MAX6323AUT46-T FAQ
1.How can I place an order for MAX6323AUT46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323AUT46-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 MAX6323AUT46-T reliable?
The price and inventory of MAX6323AUT46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323AUT46-T is usually 5 days.
3.What payment methods are accepted for MAX6323AUT46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323AUT46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323AUT46-T?
MAX6323AUT46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323AUT46-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 MAX6323AUT46-T?
For technical support, including MAX6323AUT46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323AUT46-T requirements.
6.How does Aetrix verify that MAX6323AUT46-T is sourced from the original manufacturer or authorized distributors?
All MAX6323AUT46-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 MAX6323AUT46-T meets industry standards.
7.What is the process for return or replacement of MAX6323AUT46-T?
All MAX6323AUT46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323AUT46-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 MAX6323AUT46-T part is unused and in its original packaging.
Return procedure for MAX6323AUT46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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