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Analog Devices Inc./Maxim Integrated MAX6324BUT29-T
- Part No.:
- MAX6324BUT29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324BUT29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
MAX6324BUT29-T from Maxim Integrated is a microprocessor supervisory IC with windowed (min/max) watchdog timer, open-drain RESET output, and factory-trimmed 2.93V reset threshold (±2.5% accuracy). It monitors +2.5V to +5.0V supplies, guarantees valid RESET down to VCC = +1.2V, and operates across –40°C to +125°C for automotive and industrial control systems.
For engineers reviewing the MAX6324BUT29-T datasheet, MAX6324BUT29-T pinout, MAX6324BUT29-T application, or MAX6324BUT29-T equivalent, key selection criteria include its B-suffix 15ms fast/100ms slow watchdog timeout window, 23µA typical supply current, open-drain WDPO and RESET outputs, and SOT23-6 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6324BUT29-T implements a dual-threshold watchdog that detects both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >100ms), with WDPO pulsing low for 1ms upon fault detection. Its internal reset comparator asserts active-low RESET when VCC drops below 2.93V and holds it for ≥100ms after recovery.
It features debounced manual reset (MR) input with 1µs minimum pulse width and 100ns glitch immunity, plus guaranteed operation down to VCC = +1.2V - enabling robust brownout detection in noisy automotive power domains. The open-drain RESET and WDPO outputs support level-shifting and bidirectional µP reset interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (2.85V–3.00V range), ±2.5% accuracy over –40°C to +125°C - ensures precise power-on/brownout detection for 3.0V/3.3V systems |
| Watchdog Timeout (Fast) | 15ms max (B-suffix), min 10ms - rejects spurious WDI pulses while detecting stuck-loop execution faster than standard watchdogs |
| Watchdog Timeout (Slow) | 100ms min, 150ms max (B-suffix) - provides sufficient margin for normal software execution windows in real-time control firmware |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V - enables always-on supervision in battery-backed or low-power industrial nodes |
| RESET Assertion Delay | ≥100ms after VCC rise above threshold and MR deassertion - meets µP power-up timing requirements without external RC delays |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, motor drive, and industrial PLC environments |
| VCC Range | 1.2V to 5.5V - supports supervision of legacy 2.5V, modern 3.3V, and 5.0V logic rails with single device |
Pinout & Package
MAX6324BUT29-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), optimized for high-density PCB layouts and reflow-compatible lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internally pulled up; asserts RESET and clears watchdog on falling edge; 1µs minimum pulse width required |
| 2 - GND | Ground reference | Common return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 3 - WDI | Watchdog input | Falling-edge triggered; resets internal watchdog timer; 300ns minimum pulse width; 100ns glitch immunity |
| 4 - VCC | Supply voltage input | Monitored rail; bypass with ≥500pF capacitor near pin to suppress noise-induced false resets |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault detection; requires external pullup to ≤+6V; inactive when RESET is asserted |
| 6 - RESET | Active-low open-drain reset output | Asserted when VCC < 2.93V or MR low; requires external pullup; compatible with bidirectional µP reset pins |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Detects both premature (fast) and delayed (slow) WDI transitions - prevents false positives from jitter while catching hung loops missed by single-threshold watchdogs |
| Laser-trimmed reset threshold | 2.93V ±2.5% over full temperature range - eliminates need for external resistor dividers and improves long-term stability vs. discrete solutions |
| Guaranteed RESET validity to VCC = +1.2V | Ensures deterministic reset assertion during deep brownout - critical for fail-safe shutdown in automotive ECU and industrial safety controllers |
| Debounced MR input | Accepts direct switch connection without external RC network - reduces BOM count and board area in panel-mounted reset applications |
| Open-drain RESET and WDPO | Enables level-shifting across different supply domains and wired-OR reset bus configurations - simplifies integration with mixed-voltage µPs and FPGAs |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervises 3.3V microcontroller power rail and software execution in engine management systems exposed to wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Provides power-on reset, brownout detection, and windowed watchdog monitoring of main µP's WDI signal to detect firmware stalls or clock faults. Use Value: Prevents unsafe engine operation due to undetected µP lockup; AEC-Q100-qualified variants available for production deployment. |
Use Scenario: Monitors 24V-to-3.3V DC/DC output and supervises real-time control firmware in programmable logic controller backplane modules. IC Role / Device Role / Timing Role: Generates clean reset pulse on power-up and asserts WDPO if cyclic I/O scan timing deviates beyond 100ms window. Use Value: Enables automatic recovery from transient software hangs without operator intervention, improving system uptime in factory automation. |
| Medical Infusion Pump Controller | Smart Grid Protection Relay |
Use Scenario: Ensures safe startup and continuous firmware health monitoring in battery-powered infusion pumps requiring Class III medical device reliability. IC Role / Device Role / Timing Role: Supplies validated reset signal to ARM Cortex-M4 and pulses WDPO on missed motor-control loop deadlines to trigger safe-stop sequence. Use Value: Meets IEC 62304 SW safety requirements by providing independent hardware-level watchdog with min/max timing enforcement. |
Use Scenario: Supervises FPGA configuration and protection algorithm execution in high-voltage substation relays operating in harsh electromagnetic environments. IC Role / Device Role / Timing Role: Monitors 5.0V auxiliary supply and validates µP activity via WDI; uses open-drain RESET to interface with FPGA's bidirectional reset pin. Use Value: Eliminates need for external reset supervisor ASIC; 1.2V VCC operation ensures reset remains active during severe grid sags. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324CUT29-T | Same 2.93V reset threshold but C-suffix watchdog: 15ms fast / 300ms slow timeout window | Broadens fault detection window for slower-executing firmware; less sensitive to short-duration timing jitter | Select when application firmware has longer task cycles or higher interrupt latency tolerance |
| TLV809K33DBZR | Fixed 3.3V reset threshold, no watchdog, push-pull RESET, 1.6µA quiescent current | Lacks windowed watchdog functionality; suitable only for basic power-monitoring applications without µP activity supervision | Choose only if watchdog capability is unnecessary and ultra-low power (<2µA) is prioritized over system-level fault coverage |
Compared with MAX6324BUT29-T, MAX6324CUT29-T extends the slow watchdog window to 300ms for relaxed timing margins, while TLV809K33DBZR sacrifices watchdog intelligence for minimal current draw - making MAX6324BUT29-T the optimal balance of precision supervision, fault coverage, and thermal robustness in demanding embedded control.
Availability
MAX6324BUT29-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and smart grid protection relays requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6324BUT29-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, low power, and high integration.
The MAX6323/MAX6324 family delivers highly accurate, temperature-stable µP supervision with windowed watchdog capability - engineered specifically for safety-critical embedded systems where deterministic reset behavior and firmware execution integrity are non-negotiable.
FAQ
What is the exact reset threshold voltage of MAX6324BUT29-T and how stable is it over temperature?
The MAX6324BUT29-T has a nominal reset threshold of 2.93V, with guaranteed range of 2.85V to 3.00V (±2.5%) across –40°C to +125°C. Typical operating characteristics show normalized threshold variation within ±0.2% over temperature, confirming laser trimming delivers high stability without external calibration. This precision ensures reliable power-on reset and brownout detection in 3.0V/3.3V systems.
How does the B-suffix watchdog timeout configuration work in MAX6324BUT29-T?
The "B" in MAX6324BUT29-T specifies the watchdog timeout window: fast timeout is 10ms to 15ms, and slow timeout is 100ms to 150ms. These factory-trimmed values define the acceptable window for WDI falling edges - deviations outside this range trigger a 1ms WDPO pulse. This windowed architecture detects both stuck loops and premature interrupts more reliably than single-threshold watchdogs.
Can MAX6324BUT29-T drive a microcontroller reset pin directly without external components?
Yes - the MAX6324BUT29-T's open-drain RESET output can interface directly with most µP reset pins using a single external pullup resistor (e.g., 10kΩ to VCC). Its guaranteed VOL ≤0.4V at 1.2mA sink current ensures solid logic-low assertion, and the 100ms minimum reset timeout satisfies typical µP power-up requirements without additional timing circuitry.
Is MAX6324BUT29-T qualified for automotive applications?
The base MAX6324BUT29-T is specified for –40°C to +125°C and meets AEC-Q100 stress test requirements when ordered as MAX6324BUT29/V+T (automotive-grade variant). While the -T suffix denotes lead-free packaging, automotive qualification requires the /V prefix; Aetrix Electronics stocks both commercial and automotive versions with full traceability and PPAP documentation support.
What is the minimum VCC voltage at which MAX6324BUT29-T guarantees valid RESET assertion?
MAX6324BUT29-T guarantees valid RESET output down to VCC = +1.2V - meaning the RESET pin remains actively driven low (not floating) even as the supply collapses. This is critical for fail-safe shutdown in automotive and industrial systems, ensuring downstream logic receives a defined state during brownout conditions before VCC reaches 0V.
MAX6324BUT29-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:
- Open Drain or Open Collector
- 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
MAX6324BUT29-T FAQ
1.How can I place an order for MAX6324BUT29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324BUT29-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 MAX6324BUT29-T reliable?
The price and inventory of MAX6324BUT29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324BUT29-T is usually 5 days.
3.What payment methods are accepted for MAX6324BUT29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324BUT29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324BUT29-T?
MAX6324BUT29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324BUT29-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 MAX6324BUT29-T?
For technical support, including MAX6324BUT29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324BUT29-T requirements.
6.How does Aetrix verify that MAX6324BUT29-T is sourced from the original manufacturer or authorized distributors?
All MAX6324BUT29-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 MAX6324BUT29-T meets industry standards.
7.What is the process for return or replacement of MAX6324BUT29-T?
All MAX6324BUT29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324BUT29-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 MAX6324BUT29-T part is unused and in its original packaging.
Return procedure for MAX6324BUT29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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