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Analog Devices Inc./Maxim Integrated MAX6323EUT46-T
- Part No.:
- MAX6323EUT46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323EUT46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,282
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Product details
Overview
MAX6323EUT46-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 power integrity and processor timing in automotive engine control units, industrial PLCs, and medical infusion pumps.
For engineers reviewing the MAX6323EUT46-T datasheet, MAX6323EUT46-T pinout, MAX6323EUT46-T application, or MAX6323EUT46-T equivalent, key selection criteria include its factory-trimmed 4.63V reset threshold, push-pull RESET output, 1.5ms/10ms fast/slow watchdog timeout pair (suffix 'A'), guaranteed reset validity down to VCC = +1.2V, and AEC-Q100-qualified variants for automotive use.
Technical Context
The MAX6323EUT46-T implements a dual-window watchdog that detects both fast faults (WDI falling edges <1.5ms apart) and slow faults (no WDI edge >10ms), using internal laser-trimmed timing. Its VCC monitor features a precision bandgap reference and hysteresis-free comparator ensuring monotonic reset assertion/deassertion.
RESET is push-pull active-low with VOH ≥ VCC − 1.5V at 4.75V and VOL ≤ 0.4V at 4.25V/3.2mA; WDPO is open-drain, pulsed low for 1ms on fault detection. The MR input includes internal 85kΩ pullup and 100ns glitch immunity, requiring only a 1µs minimum pulse width to trigger reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% - precisely matches +5.0V rail monitoring with margin for brownout detection |
| Reset Timeout Delay | 100ms minimum - ensures µP completes full power-up initialization before release |
| Watchdog Fast Timeout | 1.5ms - detects runaway loops or clock faults with sub-millisecond timing violation |
| Watchdog Slow Timeout | 10ms - identifies stalled execution or missed watchdog refreshes in real-time firmware |
| Supply Current | 23µA typical at 3.3V - enables always-on supervision in battery-backed systems |
| Operating Voltage Range | +1.2V to +5.5V - guarantees valid RESET output even during deep brownout conditions |
| Temperature Range | −40°C to +125°C - supports under-hood automotive and industrial ambient environments |
Pinout & Package
MAX6323EUT46-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), footprint-compatible with JEDEC MO-178AB, 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 to VCC; asserts RESET and clears watchdog timer when driven low ≥1µs |
| 2 GND | Ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane |
| 3 WDI | Watchdog input | Falling-edge-triggered; resets internal timer window; requires ≥300ns pulse width |
| 4 VCC | Supply voltage input | Monitored rail input; bypass with ≥500pF capacitor near pin for noise immunity |
| 5 WDPO | Open-drain watchdog pulse output | Pulsed low for 1ms on fast/slow fault detection; requires external pullup to ≤+6V |
| 6 RESET | Active-low push-pull reset output | Drives µP reset pin directly; no external pullup needed; sinks 1.2mA at 0.4V max |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Detects both premature and delayed WDI pulses-critical for safety-critical firmware validation |
| Factory-trimmed 4.63V reset threshold | ±2.5% accuracy over −40°C to +125°C eliminates need for external resistor divider calibration |
| Push-pull RESET output | Eliminates external pullup resistor, reducing BOM count and PCB space in cost-sensitive designs |
| Valid RESET down to VCC = +1.2V | Ensures deterministic reset state during deep undervoltage events before system collapse |
| Debounced MR input | Internal 85kΩ pullup and 100ns glitch rejection enable direct switch connection without RC network |
| Low 23µA quiescent current | Enables permanent supervision in energy-constrained applications like automotive telematics modules |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 5V microcontroller supply and validates firmware execution timing in diesel injection control. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and windowed watchdog supervision of main MCU. Use Value: Prevents unsafe actuator commands during software hangs or voltage sags by forcing controlled restart within 100ms. |
Use Scenario: Ensures reliable startup and runtime integrity of ladder-logic processors in factory automation cabinets. IC Role / Device Role / Timing Role: System-level supervisor detecting both supply instability and firmware lockup via WDI monitoring. Use Value: Guarantees deterministic reset behavior across wide temperature swings (−40°C to +125°C) and EMI-rich industrial environments. |
| Medical Infusion Pump Controller | Railway Signaling Interface Module |
Use Scenario: Validates real-time motor control firmware and 3.3V logic supply in battery-operated infusion devices. IC Role / Device Role / Timing Role: Safety-critical supervisor asserting RESET if VCC drops below 4.63V or WDI timing deviates from 1.5ms/10ms window. Use Value: Meets IEC 62304 Class C requirements by preventing delivery of incorrect dosage due to silent software failure. |
Use Scenario: Provides fail-safe reset and watchdog supervision for track-side interlocking controllers operating in harsh outdoor conditions. IC Role / Device Role / Timing Role: High-reliability supervisor with guaranteed operation down to VCC = +1.2V during transient brownouts on 24V rail-derived 5V supplies. Use Value: Maintains functional safety integrity (EN 50129 SIL2) by eliminating undetected processor lockups in mission-critical signaling paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324EUT46-T | Open-drain RESET output instead of push-pull; identical reset threshold, watchdog timing, and supply specs | Required when interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11) or level-shifting across multiple supply domains | Select MAX6324EUT46-T only if external pullup on RESET is acceptable and multi-supply reset coordination is needed |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no windowed watchdog; 200ms reset timeout; 1.4µA quiescent current | Suitable for simpler brownout-only supervision where firmware timing validation is handled externally | Choose TPS3808G33DBVR for ultra-low-power applications without watchdog requirements, but not for safety-critical min/max timing enforcement |
Compared with MAX6323EUT46-T, MAX6324EUT46-T offers identical supervision functionality but requires an external pullup resistor on RESET for proper logic levels, while TPS3808G33DBVR lacks windowed watchdog capability entirely-making it unsuitable for applications demanding precise firmware execution timing validation.
Availability
MAX6323EUT46-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 MAX6323EUT46-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 ICs for demanding industrial, automotive, and medical applications.
The MAX6323/MAX6324 family delivers precision power supervision and windowed watchdog functionality specifically for safety-critical embedded systems where deterministic reset behavior and firmware timing validation are mandatory.
FAQ
What is the exact reset threshold voltage of MAX6323EUT46-T and how is it trimmed?
The MAX6323EUT46-T has a nominal reset threshold of 4.63V with ±2.5% accuracy over −40°C to +125°C. This value is achieved through factory laser trimming of internal resistors, as confirmed in the Electrical Characteristics table (VTH = 4.50V to 4.75V). No external components are required to achieve this precision, making MAX6323EUT46-T suitable for applications demanding accurate +5.0V rail monitoring without calibration.
Does MAX6323EUT46-T support windowed watchdog functionality, and what are its timeout values?
Yes, MAX6323EUT46-T implements true min/max (windowed) watchdog supervision. For suffix 'E', the fast timeout is 15ms minimum and the slow timeout is 60ms minimum, as specified in the Watchdog Timeout table. These factory-trimmed windows detect both premature and delayed WDI pulses-enabling robust validation of firmware execution timing in safety-critical applications.
What is the RESET output type of MAX6323EUT46-T, and how does it differ from MAX6324 variants?
MAX6323EUT46-T features a push-pull RESET output, meaning it actively drives both high and low states without requiring an external pullup resistor. In contrast, MAX6324EUT46-T uses an open-drain RESET output that mandates an external pullup. This distinction makes MAX6323EUT46-T ideal for simplified BOMs and direct µP reset pin driving, while MAX6324EUT46-T is selected for bidirectional reset interfaces or multi-supply level shifting.
Can MAX6323EUT46-T operate reliably during deep brownout conditions?
Yes, MAX6323EUT46-T guarantees valid RESET output down to VCC = +1.2V, as explicitly stated in the General Description and Electrical Characteristics. Below this voltage, the RESET output becomes high-impedance, but the device continues asserting RESET until VCC rises above the 4.63V threshold and remains there for ≥100ms. This ensures deterministic behavior during severe undervoltage events common in automotive and industrial power systems.
What package type and footprint does MAX6323EUT46-T use, and are there thermal design considerations?
MAX6323EUT46-T is supplied in a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175), with thermal resistance θJA = 115°C/W on multilayer PCBs. Its small footprint supports high-density layouts, but designers must observe the 696mW maximum power dissipation limit at +70°C (derating 8.7mW/°C above), especially in sealed enclosures or high-ambient-temperature applications like under-hood automotive modules.
MAX6323EUT46-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
MAX6323EUT46-T FAQ
1.How can I place an order for MAX6323EUT46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323EUT46-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 MAX6323EUT46-T reliable?
The price and inventory of MAX6323EUT46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323EUT46-T is usually 5 days.
3.What payment methods are accepted for MAX6323EUT46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323EUT46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323EUT46-T?
MAX6323EUT46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323EUT46-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 MAX6323EUT46-T?
For technical support, including MAX6323EUT46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323EUT46-T requirements.
6.How does Aetrix verify that MAX6323EUT46-T is sourced from the original manufacturer or authorized distributors?
All MAX6323EUT46-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 MAX6323EUT46-T meets industry standards.
7.What is the process for return or replacement of MAX6323EUT46-T?
All MAX6323EUT46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323EUT46-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 MAX6323EUT46-T part is unused and in its original packaging.
Return procedure for MAX6323EUT46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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