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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 4.63V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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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 WDI timing in automotive and industrial control systems to prevent runaway code execution.
For engineers reviewing the MAX6323AUT46+T datasheet, MAX6323AUT46+T pinout, MAX6323AUT46+T application, or MAX6323AUT46+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.2V, factory-trimmed 4.63V reset threshold, 1ms WDPO fault pulse width, and SOT23-6 packaging for space-constrained embedded designs.
Technical Context
The MAX6323AUT46+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 laser-trimmed timing with ±2.5% accuracy across –40°C to +125°C. Its VCC monitor guarantees valid RESET assertion down to +1.2V, enabling reliable brownout detection in low-voltage microcontroller systems.
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 VCC ≥3.15V. The WDPO open-drain output pulses low for 1ms upon fault detection and remains inactive while RESET is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (4.50V–4.75V range), ±2.5% accuracy over temperature - ensures precise power-on/brownout detection for +5V systems. |
| Reset Timeout Delay | 100ms minimum after VCC rise and MR deassertion - provides sufficient hold time for microcontroller initialization. |
| Supply Voltage Range | +1.2V to +5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains. |
| Watchdog Fast Timeout | 1.5ms minimum (A-suffix), factory-trimmed - detects premature WDI pulses indicating software lockup or clock instability. |
| Watchdog Slow Timeout | 10ms minimum (A-suffix), factory-trimmed - identifies missed WDI pulses caused by infinite loops or halted execution. |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V - enables ultra-low-power monitoring in battery-backed or energy-constrained systems. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and medical equipment environments. |
Pinout & Package
Package: 6-pin SOT23 (U6+1A outline, JEDEC MO-178AA), 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 low ≥1μs; immune to 100ns glitches. |
| 2 - GND | Ground reference | Common return path for all internal circuits; must be connected directly to system ground plane. |
| 3 - WDI | Watchdog input | Falling-edge-triggered; resets internal watchdog timer; requires ≥300ns pulse width and 0.3×VCC–0.7×VCC logic levels. |
| 4 - VCC | Supply voltage input | Monitored for reset generation; bypass with ≥500pF capacitor near pin to suppress transients. |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault detection; requires external pullup to ≤+6V; inactive while RESET is asserted. |
| 6 - RESET | Active-low push-pull reset output | Asserted low when VCC <4.63V or MR low; holds low ≥100ms after recovery; no external pullup required. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Detects both too-fast (1.5ms min) and too-slow (10ms min) WDI transitions - prevents false resets from jitter while catching true hangs. |
| Laser-trimmed precision | ±2.5% reset threshold tolerance and stable timing over –40°C to +125°C - eliminates need for external calibration in harsh environments. |
| Low-voltage reset guarantee | Valid RESET output down to VCC = +1.2V - ensures deterministic reset behavior during deep brownout before MCU core fails. |
| Debounced MR input | No external RC network needed; 1μs minimum pulse width and 100ns glitch rejection - simplifies front-panel or diagnostic reset implementation. |
| Ultra-low quiescent current | 23µA typical at 2.5V/3.3V - extends battery life in always-on monitoring applications without sacrificing response speed. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V supply and main MCU watchdog signal in engine ECU to detect firmware crashes during CAN communication or sensor polling. IC Role / Device Role / Timing Role: Push-pull RESET asserts hard reset to MCU; WDPO pulses 1ms to trigger NMI or log fault; 4.63V threshold matches 5V rail tolerance. Use Value: Prevents unsafe operation due to undetected software hang; 100ms reset hold ensures full MCU reinitialization before resuming fuel injection control. |
Use Scenario: Supervises ARM Cortex-M4-based I/O controller in programmable logic controller, verifying both power stability and cyclic task execution. IC Role / Device Role / Timing Role: VCC monitor guards against 24V-to-5V converter failure; windowed watchdog validates task scheduler timing within 1.5–10ms bounds. Use Value: Enables fail-safe shutdown via WDPO-to-MR loopback; 1.2V reset validity ensures reset assertion even during partial power collapse. |
| Medical Infusion Pump Controller | Railway Signaling Interface Board |
Use Scenario: Ensures safety-critical microcontroller in infusion pump remains responsive to motor control and occlusion detection algorithms. IC Role / Device Role / Timing Role: MR accepts clinician-initiated reset; WDPO alerts system supervisor on timing violation; RESET drives MCU reset pin directly. Use Value: 125°C rating supports sealed enclosure operation; ±2.5% threshold accuracy meets IEC 62304 Class C requirements for reset reliability. |
Use Scenario: Supervises FPGA-based signaling interface handling track occupancy detection and interlocking logic in EN 5012x-certified systems. IC Role / Device Role / Timing Role: Monitors 3.3V FPGA supply; uses WDPO to flag watchdog timeout to redundant CPU; RESET holds FPGA in reset until stable. Use Value: AEC-Q100-aligned qualification (via MAX6324HUT44/V+T family) supports functional safety evidence; SOT23-6 footprint eases conformal coating. |
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 | Open-drain RESET output instead of push-pull; identical reset threshold, watchdog timing, and package. | Required when interfacing with bidirectional MCU reset pins (e.g., Motorola 68HC11) or level-shifting to alternate supply rails. | Select MAX6324AUT46+T only if open-drain RESET is needed; otherwise MAX6323AUT46+T reduces BOM count by eliminating pullup resistor. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no windowed watchdog (only single timeout); 350ms reset delay; SOT23-6 package. | Suitable for simpler 3.3V-only systems without min/max timing validation; lacks WDPO fault signaling capability. | Choose TPS3808G33DBVR for cost-sensitive 3.3V applications where windowed watchdog is unnecessary; MAX6323AUT46+T adds critical fault discrimination. |
Compared with MAX6324AUT46+T, the MAX6323AUT46+T eliminates external pullup components and simplifies layout; versus TPS3808G33DBVR, it delivers superior system-level diagnostics via dual-window watchdog and 4.63V precision monitoring for +5V infrastructure.
Availability
MAX6323AUT46+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pumps, and railway signaling interfaces 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and medical applications, with emphasis on reliability and precision.
The MAX6323/MAX6324 product line delivers microprocessor supervision with windowed watchdog functionality specifically for safety-critical embedded systems requiring deterministic reset behavior and robust fault detection.
FAQ
What is the exact reset threshold voltage of MAX6323AUT46+T?
The MAX6323AUT46+T has a nominal reset threshold of 4.63V, with guaranteed range of 4.50V to 4.75V at ±2.5% accuracy over –40°C to +125°C. This value is laser-trimmed at wafer test and applies specifically to the "46" suffix variant, making MAX6323AUT46+T suitable for precise monitoring of +5V power rails in automotive and industrial applications.
Does MAX6323AUT46+T support windowed watchdog functionality?
Yes, MAX6323AUT46+T implements a true min/max (windowed) watchdog: it detects fast faults when WDI falling edges occur less than 1.5ms apart, and slow faults when no WDI edge occurs for more than 10ms. This dual-window architecture distinguishes it from single-timeout supervisors and is factory-trimmed for the "A" suffix, ensuring accurate timing without external components.
Can MAX6323AUT46+T operate reliably below 2.0V supply voltage?
Yes, MAX6323AUT46+T guarantees valid RESET output down to VCC = +1.2V, enabling robust brownout detection even during severe supply sag. Its supply current remains at 23µA typical at 2.5V/3.3V, and its internal comparators and timers remain functional throughout the full 1.2V–5.5V operating range - a key advantage for low-voltage embedded systems.
What is the function of the WDPO pin on MAX6323AUT46+T?
The WDPO (Watchdog Pulse Output) pin on MAX6323AUT46+T is an open-drain output that pulses low for 1ms upon detection of either a fast or slow watchdog fault. It operates independently of the RESET signal and remains inactive while RESET is asserted. WDPO requires an external pullup resistor to any supply ≤+6V and is used to trigger NMI interrupts, fault logging, or WDPO-to-MR loopback for guaranteed system restart.
Is MAX6323AUT46+T pin-compatible with other members of the MAX6323/MAX6324 family?
Yes, MAX6323AUT46+T shares identical 6-pin SOT23 pinout and electrical interface with all MAX6323 and MAX6324 variants, including MAX6324AUT46+T and MAX6323CUT29. Differences are limited to internal trim (reset threshold and watchdog timeout) and RESET output type (push-pull vs. open-drain), allowing drop-in replacement within same suffix group when matching voltage and timing requirements.
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:
- 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
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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