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Analog Devices Inc./Maxim Integrated MAX6323BUT46-T
- Part No.:
- MAX6323BUT46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323BUT46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
MAX6323BUT46-T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, 4.63V ±2.5% reset threshold, push-pull active-low RESET output, and 100ms minimum reset timeout - designed for automotive and industrial systems requiring reliable power-on/brownout detection and processor fault monitoring.
For engineers reviewing the MAX6323BUT46-T datasheet, MAX6323BUT46-T pinout, MAX6323BUT46-T application, or MAX6323BUT46-T equivalent, key selection criteria include its factory-trimmed 4.63V reset voltage, B-suffix 10–15ms fast/100–150ms slow watchdog timeout window, guaranteed RESET validity down to VCC = +1.2V, and AEC-Q100-compatible operation across –40°C to +125°C.
Technical Context
The MAX6323BUT46-T implements a dual-window watchdog that detects both fast faults (WDI falling edges <10ms apart) and slow faults (no WDI edge >100ms), with WDPO pulsed low for 1ms on fault detection. Its internal reset comparator guarantees monotonic assertion/deassertion with 20µs response to VCC transients.
This variant uses laser-trimmed circuitry to fix the reset threshold at 4.63V (nominal) and the watchdog timeout window to B-suffix (fast: 10–15ms, slow: 100–150ms). It features debounced MR input, 23µA typical supply current, and push-pull RESET capable of sourcing/sinking 500µA/1.2mA respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% - precisely monitors +5.0V supply rails with guaranteed trip point across temperature. |
| Watchdog Window (B) | Fast timeout: 10–15ms; Slow timeout: 100–150ms - enables detection of both stuck-loop and hung-processor conditions. |
| RESET Timeout Delay | 100–280ms - ensures µP completes power-up initialization before release, preventing premature execution. |
| Supply Current | 23µA typical at 3.3V - supports always-on monitoring in battery-backed or low-power embedded systems. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
| VCC Range | 1.2V to 5.5V - RESET remains valid down to 1.2V, enabling robust brownout detection even during deep supply sag. |
| RESET Output Type | Push-pull - eliminates need for external pullup resistor; drives logic-low directly without external components. |
Pinout & Package
MAX6323BUT46-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.3mm × 2.2mm footprint and 0.95mm height - optimized for space-constrained PCB layouts in automotive ECUs and industrial controllers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internally pulled up; accepts direct switch connection; asserts RESET for ≥100ms after rising edge; rejects 100ns glitches. |
| 2 - GND | Ground reference | Primary return path for all internal circuits; must be connected to system ground plane for noise immunity. |
| 3 - WDI | Watchdog input | Falling-edge-triggered; resets internal timer; requires ≥300ns pulse width; immune to 100ns noise spikes. |
| 4 - VCC | Supply voltage input | Monitored rail input; requires ≥500pF bypass capacitor near pin for transient immunity and stable reset timing. |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault detection; requires external pullup; only active when RESET is high. |
| 6 - RESET | Active-low push-pull reset output | Drives low during VCC undervoltage or MR assertion; releases after 100ms delay; no external pullup needed. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog | Detects both too-fast (e.g., runaway loop) and too-slow (e.g., stalled execution) WDI transitions - critical for safety-critical firmware validation. |
| Laser-trimmed precision | ±2.5% reset threshold accuracy and factory-set B-window timeouts eliminate external calibration and reduce BOM count. |
| Guaranteed RESET down to VCC = +1.2V | Ensures deterministic reset behavior during deep brownout events where other supervisors may release prematurely. |
| Debounced MR input | Accepts mechanical switch inputs directly without RC network - simplifies front-panel reset design and reduces component count. |
| Low quiescent current | 23µA typical supply draw enables continuous supervision in energy-sensitive applications like telematics or sensor nodes. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V supply and main MCU activity in engine management systems subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises VCC integrity and validates µP instruction flow via WDI; asserts RESET on brownout or software hang. Use Value: Prevents erratic actuator control by guaranteeing clean restart after power disturbance or firmware fault - meeting ISO 16750-2 requirements. |
Use Scenario: Embedded in modular I/O cards where fieldbus communication and analog input sampling must recover reliably after power interruption. IC Role / Device Role / Timing Role: Provides power-on reset and watchdog supervision for ARM-based controller; interfaces via WDI/WDPO to firmware health-check routines. Use Value: Enables 100ms minimum reset hold time and 1ms WDPO pulse for NMI-based error logging - improving diagnostic traceability in certified automation equipment. |
| Medical Infusion Pump Controller | Railway Signaling Interface Board |
Use Scenario: Ensures fail-safe shutdown and restart of motor control MCU in battery-powered infusion devices operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail and validates real-time task scheduling via periodic WDI pulses; triggers hardware reset on missed deadline. Use Value: Meets IEC 62304 Class C software safety requirements through deterministic watchdog response and VCC-valid-to-1.2V operation. |
Use Scenario: Used in wayside signaling electronics exposed to EMI-rich traction environments and wide thermal cycling (-40°C to +85°C). IC Role / Device Role / Timing Role: Supervises FPGA configuration voltage and monitors watchdog heartbeat from safety-critical firmware running on dual-core processor. Use Value: Leverages ±2.5% reset accuracy and -40°C to +125°C rating to maintain SIL-4 compliance under rail-specific environmental stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324BUT46-T | Same reset threshold (4.63V) and B-window timeout, but open-drain RESET output requiring external pullup. | Suitable for bidirectional µP reset pins (e.g., Motorola 68HC11) or level-shifting across multiple supply domains. | Select when interfacing with µPs needing open-drain reset arbitration or multi-rail reset coordination. |
| TPS3808G33DBVR | Fixed 3.08V reset threshold, no windowed watchdog - only basic power-on/brownout reset with adjustable delay. | Lacks min/max watchdog capability; limited to single-threshold supply monitoring in non-safety-critical applications. | Choose only if windowed watchdog functionality is unnecessary and 3.3V rail supervision suffices. |
Compared with MAX6324BUT46-T, the MAX6323BUT46-T eliminates pullup resistors and simplifies layout; versus TPS3808G33DBVR, it adds critical dual-window fault detection essential for functional safety compliance in automotive and medical systems.
Availability
MAX6323BUT46-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 MAX6323BUT46-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, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6323/MAX6324 product line delivers AEC-Q100-qualified supervisory circuits with windowed watchdogs specifically engineered for functional safety–critical embedded systems where deterministic reset and processor health monitoring are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6323BUT46-T?
The MAX6323BUT46-T has a 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 temperature range. This value is laser-trimmed at wafer test and applies specifically to the UT46 suffix variant, making it suitable for precise monitoring of +5.0V power rails.
Does the MAX6323BUT46-T support windowed watchdog functionality?
Yes, the MAX6323BUT46-T implements a true min/max (windowed) watchdog. Its B-suffix configuration provides a fast timeout window of 10–15ms and a slow timeout window of 100–150ms. A watchdog fault is triggered if the WDI input falls outside either boundary - detecting both runaway loops and processor hangs.
What is the RESET output type of the MAX6323BUT46-T and why does it matter?
The MAX6323BUT46-T features a push-pull RESET output, unlike the open-drain version in the MAX6324 series. This means it actively drives both high and low states without requiring an external pullup resistor - reducing component count, simplifying PCB layout, and ensuring faster rise/fall times in noise-sensitive applications.
Can the MAX6323BUT46-T operate reliably during severe supply sags?
Yes, the MAX6323BUT46-T guarantees valid RESET assertion down to VCC = +1.2V. Below this voltage, the RESET output becomes high-impedance, but the device continues asserting RESET until VCC recovers above the 4.63V threshold and holds for ≥100ms - ensuring robust brownout recovery in automotive cold-crank scenarios.
Is the MAX6323BUT46-T qualified for automotive use?
The MAX6323BUT46-T operates across –40°C to +125°C and meets AEC-Q100 stress testing requirements per the MAX6324HUT44/V+T qualification referenced in the datasheet. While the "/V" suffix denotes formal automotive qualification, the MAX6323BUT46-T shares identical process, packaging, and characterization - widely deployed in automotive ECUs and infotainment systems.
MAX6323BUT46-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
MAX6323BUT46-T FAQ
1.How can I place an order for MAX6323BUT46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323BUT46-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 MAX6323BUT46-T reliable?
The price and inventory of MAX6323BUT46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323BUT46-T is usually 5 days.
3.What payment methods are accepted for MAX6323BUT46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323BUT46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323BUT46-T?
MAX6323BUT46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323BUT46-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 MAX6323BUT46-T?
For technical support, including MAX6323BUT46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323BUT46-T requirements.
6.How does Aetrix verify that MAX6323BUT46-T is sourced from the original manufacturer or authorized distributors?
All MAX6323BUT46-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 MAX6323BUT46-T meets industry standards.
7.What is the process for return or replacement of MAX6323BUT46-T?
All MAX6323BUT46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323BUT46-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 MAX6323BUT46-T part is unused and in its original packaging.
Return procedure for MAX6323BUT46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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