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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 2.93V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,891
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Product details
Overview
MAX6323DUT29+T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, 2.93V ±2.5% reset threshold, push-pull active-low RESET output, and 15ms fast / 10s slow watchdog timeout windows - used in automotive engine control units to monitor MCU execution timing and power integrity during cold-crank conditions.
For engineers reviewing the MAX6323DUT29+T datasheet, MAX6323DUT29+T pinout, MAX6323DUT29+T application, or MAX6323DUT29+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.2V, debounced manual reset input, 23µA typical supply current, and AEC-Q100-compliant operation across –40°C to +125°C.
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 for >10s), with WDPO pulsed low for 1ms on fault detection. Its internal reset comparator guarantees valid RESET assertion even as VCC decays to +1.2V.
It features a factory-laser-trimmed 2.93V reset threshold (±2.5% over –40°C to +125°C), 100ms minimum reset timeout delay, and MR input with 1µs minimum pulse width and 100ns glitch immunity - all integrated in a 6-pin SOT23 package with BiCMOS process technology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% - precisely monitors +3.0V rail brownout without false triggers under temperature variation |
| Watchdog Fast Timeout | 15ms - detects MCU software lockup within tight timing loops (e.g., motor control PWM servicing) |
| Watchdog Slow Timeout | 10s - identifies extended hang conditions such as failed sensor polling or communication timeouts |
| RESET Assertion Delay | ≥100ms after VCC rise - ensures stable power-up before releasing µP from reset state |
| Supply Current | 23µA typical at 3.3V - enables always-on monitoring in battery-backed automotive modules |
| Operating Temperature | –40°C to +125°C - qualified for under-hood engine control and transmission control applications |
| VCC Range | 1.2V to 5.5V - supports valid RESET output during deep brownout, critical for fail-safe shutdown sequencing |
Pinout & Package
MAX6323DUT29+T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.3mm × 0.8mm footprint and 0.95mm height - compatible with standard high-volume SMT assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internally pulled up; accepts direct switch connection; 1µs min pulse width ensures noise immunity |
| 2 - GND | Ground reference | Primary return path for RESET, WDPO, and internal comparators; requires low-impedance PCB plane |
| 3 - WDI | Watchdog input | Falling-edge triggered; resets internal timer; 300ns min pulse width prevents spurious clearing |
| 4 - VCC | Supply voltage input | Monitored rail input; bypass with ≥500pF capacitor near pin to suppress transients |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fault; requires external pullup to system supply (≤+6V); independent of RESET state |
| 6 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; no external pullup needed; sinks current down to VCC = +1.2V |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Detects both too-fast and too-slow WDI pulses - eliminates single-threshold blind spots in safety-critical firmware monitoring |
| Laser-trimmed reset threshold | 2.93V ±2.5% over full temperature range - removes need for external resistor divider calibration in production |
| Guaranteed RESET down to VCC = +1.2V | Ensures deterministic reset assertion during deep undervoltage events - critical for ISO 16750-2 automotive load dump recovery |
| Debounced MR input | Internal RC filtering eliminates need for external hardware debounce - reduces BOM count in space-constrained ECUs |
| Low quiescent current | 23µA typical - extends battery life in always-on vehicle modules (e.g., telematics wake-on-LIN) |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
|
Use Scenario: Monitors real-time firmware execution in gasoline direct injection ECU during cold-start cranking where VCC dips to 2.8V. IC Role / Device Role / Timing Role: Windowed watchdog verifies WDI pulse timing against 15ms/10s boundaries; RESET holds MCU in reset until stable 3.0V rail is confirmed. Use Value: Prevents erratic injector firing due to hung code while maintaining fail-safe reset behavior during marginal supply conditions. |
Use Scenario: Supervises CAN-based gear-shifting logic in 8-speed automatic transmission under thermal stress (>110°C ambient). IC Role / Device Role / Timing Role: Uses MR input for diagnostic-initiated reset; WDPO pulses to NMI pin to trigger error logging before full reset. Use Value: Enables non-destructive fault capture without losing volatile calibration data during intermittent software faults. |
| Brake-by-Wire Controller | ADAS Domain Controller Power Sequencer |
|
Use Scenario: Provides ASIL-B compliant supervision of dual-core MCU in electro-hydraulic brake actuator during vibration-induced signal corruption. IC Role / Device Role / Timing Role: RESET output drives both MCU cores synchronously; WDPO alerts safety manager of timing violations before escalation to hardware fault. Use Value: Meets ISO 26262 requirement for independent timing supervision with <1ms fault detection latency. |
Use Scenario: Coordinates power-up sequencing of radar SoC, camera ISP, and Ethernet switch in Level 2+ ADAS domain controller. IC Role / Device Role / Timing Role: Uses 100ms reset timeout to hold downstream ICs in reset until PMIC confirms all rails are in regulation. Use Value: Eliminates race conditions between heterogeneous processors by enforcing strict power-rail readiness before release. |
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 | Open-drain RESET output instead of push-pull; identical watchdog and reset thresholds | Required when interfacing with bidirectional µP reset pins (e.g., legacy 68HC11) or multi-supply level shifting | Select MAX6324DUT29+T only if open-drain drive capability or shared-reset bus topology is needed |
| TLV809E29DBVR | Single-threshold reset (2.93V), no watchdog function, 35µA supply current, SOT23-5 package | Suitable for basic power-on reset only - lacks windowed watchdog for functional safety monitoring | Choose TLV809E29DBVR only for cost-sensitive non-safety applications where watchdog is omitted |
Compared with MAX6324DUT29+T, the MAX6323DUT29+T provides direct-drive RESET without external pullup, simplifying layout; versus TLV809E29DBVR, it adds critical windowed watchdog functionality required for ISO 26262 ASIL-B compliance in automotive control systems.
Availability
MAX6323DUT29+T is available at Aetrix Electronics and suitable for automotive engine control, transmission management, and brake-by-wire systems requiring stable component supply with AEC-Q100 qualification and extended temperature support.
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 precision analog and mixed-signal ICs for automotive, industrial, and communications applications - with emphasis on reliability, low power, and high integration.
The MAX6323/MAX6324 family delivers AEC-Q100-qualified microprocessor supervision with windowed watchdog for functional safety in automotive ECUs, targeting ISO 26262 ASIL-B system requirements.
FAQ
What is the exact reset threshold voltage of MAX6323DUT29+T and how is it trimmed?
The MAX6323DUT29+T has a factory-laser-trimmed nominal reset threshold of 2.93V with ±2.5% accuracy over –40°C to +125°C. This value is fixed per unit and corresponds to the "29" suffix in the part number, referencing the 2.85V–3.00V range in the Reset Threshold Range table. No external adjustment is possible - the trim is permanent and process-controlled.
Does MAX6323DUT29+T support watchdog functionality for both fast and slow timing violations?
Yes, MAX6323DUT29+T implements a true windowed (min/max) watchdog. With the "D" suffix, it provides a 15ms fast timeout (detecting WDI edges too close together) and a 10s slow timeout (detecting absence of WDI edges beyond that interval). WDPO pulses low for 1ms upon either fault condition, independent of the RESET output state.
What is the minimum VCC level at which MAX6323DUT29+T guarantees valid RESET output?
MAX6323DUT29+T guarantees valid active-low RESET output down to VCC = +1.2V. Below this voltage, the internal output stage ceases sinking current and becomes high-impedance. This specification ensures deterministic reset assertion during severe brownout events common in automotive cold-crank scenarios.
Can MAX6323DUT29+T be used in systems requiring AEC-Q100 qualification?
Yes, MAX6323DUT29+T is AEC-Q100 qualified for Grade 0 (–40°C to +150°C junction) and Grade 1 (–40°C to +125°C ambient), as confirmed by Maxim's documentation and ordering codes. The "+T" suffix denotes lead-free packaging, and the device meets stress testing requirements for automotive under-hood applications.
How does the manual reset (MR) input behave on MAX6323DUT29+T during power-up?
On MAX6323DUT29+T, the MR input is internally pulled up to VCC, so it can be left unconnected if unused. When asserted low (≥1µs pulse width), it forces RESET low and clears the watchdog timer. After MR releases, RESET remains asserted for ≥100ms - ensuring µP reset duration meets typical boot-loader timing requirements regardless of VCC ramp rate.
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:
- Active
- 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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