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Analog Devices Inc./Maxim Integrated MAX6323EUT29-T
- Part No.:
- MAX6323EUT29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323EUT29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,516
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Product details
Overview
MAX6323EUT29-T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, precision 2.93V ±2.5% reset threshold, push-pull active-low RESET output, and guaranteed operation down to VCC = +1.2V. It monitors power supply integrity and µP activity in automotive engine control units, industrial PLCs, and medical infusion pumps.
For engineers reviewing the MAX6323EUT29-T datasheet, MAX6323EUT29-T pinout, MAX6323EUT29-T application, or MAX6323EUT29-T equivalent, key selection criteria include its factory-trimmed 290ms slow watchdog timeout (H variant), 1.5ms fast watchdog window, 23µA typical supply current, and SOT23-6 package compatibility with high-reliability embedded systems requiring AEC-Q100-aligned timing supervision.
Technical Context
The MAX6323EUT29-T implements a dual-window watchdog architecture: it detects both fast faults (WDI falling edges <1.5ms apart) and slow faults (no WDI edge >290ms), with WDPO pulsing low for 1ms on fault detection. Its internal reset comparator guarantees valid RESET assertion down to VCC = +1.2V, enabling robust brownout recovery in noisy 12V automotive environments.
It features a debounced manual reset input (MR) with 1µs minimum pulse width and 100ns glitch immunity, and a push-pull RESET output capable of sourcing 500µA at 0.8×VCC - eliminating external pullup requirements for 3.3V/5V µP interfaces. The device operates across -40°C to +125°C with ±2.5% reset threshold accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% (nominal 2.85–3.00V); ensures reliable reset assertion during 3.3V rail brownout without false triggering. |
| Watchdog Slow Timeout | 290ms (H variant); factory-trimmed window for detecting µP software hangs in real-time control loops. |
| Watchdog Fast Timeout | 1.5ms (A variant); detects runaway code executing too rapidly, e.g., infinite polling loops. |
| Supply Current | 23µA typical at 3.3V; enables always-on supervision in battery-backed industrial sensors. |
| RESET Assertion Delay | 100ms minimum after VCC rise/MR deassert; meets µP power-up initialization timing requirements. |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial motor drive applications. |
| VCC Range | 1.2V to 5.5V; supports valid reset signaling even during deep brownout conditions. |
Pinout & Package
Package: 6-pin SOT23 (U6+1A), surface-mount, RoHS-compliant lead-free (-T suffix), 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 VCC, RESET, WDPO, and WDI; requires low-inductance connection to minimize noise coupling. |
| 3 WDI | Watchdog input | Falling-edge-triggered; resets internal timer on each valid edge; rejects pulses <300ns wide. |
| 4 VCC | Supply voltage input | Monitored rail (1.2–5.5V); requires ≥500pF bypass capacitor near pin for transient immunity. |
| 5 WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault detection; requires external pullup to ≤6V supply; active only when RESET is high. |
| 6 RESET | Active-low push-pull reset output | Drives µP reset pin directly; no pullup needed; sinks 1.2mA @ 0.4V, sources 500µA @ 0.8×VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Dual-threshold detection (1.5ms fast / 290ms slow) prevents false resets from jittery or bursty µP activity. |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.2V, ensuring deterministic behavior during deep brownout recovery. |
| Debounced MR input | No external RC network required; internal 85kΩ pullup and 100ns glitch rejection simplify front-panel reset design. |
| Precision reset threshold | ±2.5% accuracy over -40°C to +125°C enables direct replacement of 3.3V µPs without recalibration. |
| Low quiescent current | 23µA typical allows integration into always-on subsystems without compromising battery life. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 5V logic supply and µP execution in diesel ECU during cold cranking, where battery voltage dips to 6V. 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 by forcing reset if µP hangs during fuel injection timing loop, using 290ms slow timeout aligned to combustion cycle timing. |
Use Scenario: Ensures deterministic startup and runtime supervision of ARM-based controller in factory automation I/O module. IC Role / Device Role / Timing Role: System-level supervisor generating clean reset pulse and detecting firmware lockups via WDI monitoring. Use Value: Guarantees 100ms minimum RESET assertion for FPGA configuration completion while rejecting 20µs VCC transients common in relay-switched 24V industrial rails. |
| Medical Infusion Pump Controller | Railway Signaling Interface Module |
Use Scenario: Provides fail-safe reset and watchdog supervision for safety-critical dosing algorithm running on Cortex-M4 MCU. IC Role / Device Role / Timing Role: Fault-detection node verifying µP liveness and power stability in Class II medical device. Use Value: Dual-window watchdog (1.5ms/290ms) distinguishes between intentional short pulses and dangerous stuck states, meeting IEC 62304 SW safety requirements. |
Use Scenario: Supervises 3.3V µP in EN 5012x-compliant trackside signal processor exposed to EMI and voltage surges. IC Role / Device Role / Timing Role: High-reliability power monitor and watchdog with extended temperature range support. Use Value: ±2.5% reset threshold accuracy and -40°C to +125°C operation ensure consistent behavior across desert and arctic deployment environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324EUT29-T | Open-drain RESET output instead of push-pull; identical watchdog, reset threshold, and timing specs. | Required when interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11) or level-shifting across multiple supply domains. | Select MAX6324EUT29-T only if open-drain RESET is needed; otherwise MAX6323EUT29-T simplifies layout with no pullup resistor. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold (±0.5%), no windowed watchdog; only basic min-time watchdog (200ms typ). | Suitable for cost-sensitive applications lacking need for dual-window fault detection or 2.93V threshold precision. | Choose TPS3808G33DBVR for simpler designs where 3.3V-only reset and single-window watchdog suffice. |
Compared with MAX6324EUT29-T, the MAX6323EUT29-T eliminates external RESET pullup components and reduces BOM count; versus TPS3808G33DBVR, it delivers superior fault discrimination via min/max watchdog windows and tighter 2.93V threshold accuracy critical for 3.3V system margin analysis.
Availability
MAX6323EUT29-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 MAX6323EUT29-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 and parametric accuracy.
The MAX6323/MAX6324 product line delivers high-accuracy µP supervision with windowed watchdog functionality specifically for safety-critical embedded systems where deterministic reset behavior and software-execution monitoring are mandatory.
FAQ
What is the factory-trimmed watchdog timeout configuration for MAX6323EUT29-T?
The "E" in MAX6323EUT29-T specifies the slow watchdog timeout variant: 60ms minimum / 90ms typical / 1.3s maximum (per datasheet Table "Watchdog Timeout (Slow)"). The fast timeout is 10ms minimum / 15ms typical. These values are laser-trimmed at wafer test and guaranteed across -40°C to +125°C. MAX6323EUT29-T does not use the H variant (290ms); that corresponds to MAX6323HUT29-T.
Does MAX6323EUT29-T support operation below 2.5V supply voltage?
Yes, MAX6323EUT29-T operates from VCC = +1.2V to +5.5V and guarantees valid RESET output down to +1.2V. At VCC < +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 enables robust brownout recovery in 1.8V/2.5V logic systems.
How is the reset threshold of 2.93V implemented in MAX6323EUT29-T?
The reset threshold of MAX6323EUT29-T is factory-laser-trimmed to 2.93V ±2.5% (2.85V–3.00V range), corresponding to the "29" suffix per the Reset Threshold Range table. This precision is achieved via on-chip trimming of a bandgap reference and comparator offset, ensuring stability over temperature and time without external components.
Can MAX6323EUT29-T be used in AEC-Q100 qualified automotive designs?
While MAX6323EUT29-T itself is not explicitly AEC-Q100 certified, the MAX6324HUT44/V+T variant is listed as AEC-Q100 qualified in the datasheet. MAX6323EUT29-T shares identical process (BiCMOS), package (SOT23), and operating range (-40°C to +125°C), making it suitable for many automotive applications where full qualification is not mandated - but formal AEC-Q100 compliance requires the /V+T suffix variants.
What is the function of the WDPO pin on MAX6323EUT29-T?
The WDPO (Watchdog Pulse Output) pin on MAX6323EUT29-T is an open-drain output that pulses low for 1ms (typical) upon detection of either a fast watchdog fault (WDI edges too close) or slow watchdog fault (no WDI edge within timeout). WDPO is only active when RESET is high, allowing independent fault signaling without resetting the µP - useful for logging or NMI-based error handling.
MAX6323EUT29-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
MAX6323EUT29-T FAQ
1.How can I place an order for MAX6323EUT29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323EUT29-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 MAX6323EUT29-T reliable?
The price and inventory of MAX6323EUT29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323EUT29-T is usually 5 days.
3.What payment methods are accepted for MAX6323EUT29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323EUT29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323EUT29-T?
MAX6323EUT29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323EUT29-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 MAX6323EUT29-T?
For technical support, including MAX6323EUT29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323EUT29-T requirements.
6.How does Aetrix verify that MAX6323EUT29-T is sourced from the original manufacturer or authorized distributors?
All MAX6323EUT29-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 MAX6323EUT29-T meets industry standards.
7.What is the process for return or replacement of MAX6323EUT29-T?
All MAX6323EUT29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323EUT29-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 MAX6323EUT29-T part is unused and in its original packaging.
Return procedure for MAX6323EUT29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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