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Analog Devices Inc./Maxim Integrated MAX6324BUT46-T
- Part No.:
- MAX6324BUT46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324BUT46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,045
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Product details
Overview
MAX6324BUT46-T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, open-drain RESET output, and factory-trimmed 4.63V reset threshold (±2.5% accuracy). It monitors +5.0V power supplies in automotive and industrial systems, asserts RESET low on VCC drop or manual reset, and guarantees valid RESET down to VCC = +1.2V.
For engineers reviewing the MAX6324BUT46-T datasheet, MAX6324BUT46-T pinout, MAX6324BUT46-T application, or MAX6324BUT46-T equivalent, key selection criteria include its B-suffix 15ms fast/100ms slow watchdog timeout window, 6-pin SOT23 package, 23µA typical supply current, and AEC-Q100-qualified variants for automotive use.
Technical Context
The MAX6324BUT46-T implements a dual-window watchdog that detects both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >100ms), with WDPO pulsed low for 1ms upon fault detection. Its reset comparator guarantees monotonic behavior down to VCC = +1.2V and features ±2.5% threshold accuracy over –40°C to +125°C.
RESET is open-drain and requires an external pullup; MR is internally pulled up and debounced, with 1µs minimum pulse width and 100ns glitch immunity. The device uses BiCMOS process (1371 transistors) and supports level-shifting via its open-drain outputs across multiple supply domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (4.50V–4.75V range), ±2.5% accuracy for +5.0V supply monitoring |
| Watchdog Timeout (Fast) | 15ms max - triggers WDPO if WDI pulses arrive too close together |
| Watchdog Timeout (Slow) | 100ms min - triggers WDPO if WDI pulse is missing beyond this period |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V - enables ultra-low-power always-on supervision |
| Reset Timeout Delay | 100ms minimum - ensures stable µP initialization after power-up or brownout recovery |
| 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 even during deep brownout conditions |
Pinout & Package
Package: 6-pin SOT23 (U6+1A outline, JEDEC MO-178AA), surface-mount, RoHS-compliant lead-free (-T suffix).
| 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; no external components required |
| 2 (GND) | Ground reference | Common return path for all internal circuits and external bypass capacitors (≥500pF on VCC) |
| 3 (WDI) | Watchdog input | Falling-edge-triggered; resets internal timer; immune to 100ns glitches at VCC = 2.5V |
| 4 (VCC) | Supply voltage input | Monitored for reset generation; absolute max rating +6.0V; bypass with ≥500pF capacitor for noise immunity |
| 5 (WDPO) | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault; requires external pullup to any supply ≤+6V; active only when RESET is high |
| 6 (RESET) | Active-low open-drain reset output | Asserted when VCC < 4.63V or MR low; requires external pullup; interfaces directly with bidirectional µP reset pins |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Detects both premature (fast) and delayed (slow) WDI transitions - prevents false resets from jitter while catching stuck loops |
| Factory-trimmed reset threshold | 4.63V ±2.5% - eliminates external resistor networks for +5.0V rail supervision |
| Guaranteed RESET validity to VCC = +1.2V | Ensures deterministic reset state during deep brownout - critical for fail-safe automotive control units |
| Debounced manual reset input | Internal pullup + 100ns glitch rejection - allows direct switch connection without RC network |
| Low quiescent current | 23µA typical - extends battery life in always-on monitoring applications such as telematics and sensor nodes |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V supply and software execution in engine management systems where runtime faults must trigger immediate corrective action. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and windowed watchdog supervision of ECU firmware timing. Use Value: Prevents unsafe operation due to hung code by pulsing WDPO to NMI or looping WDPO→MR to force full 100ms reset - compliant with ISO 26262 ASIL-B requirements. | Use Scenario: Ensures reliable startup and runtime integrity of programmable logic controller modules operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog co-processor that validates 5V rail stability and verifies cyclic task execution in real-time control firmware. Use Value: Open-drain RESET and WDPO enable flexible level-shifting across isolated 3.3V/5V domains; 100ms reset timeout meets IEC 61131-2 cold-start requirements. |
| Medical Infusion Pump Controller | Embedded Telematics Gateway |
Use Scenario: Provides fail-safe reset and watchdog supervision for microcontroller-based drug delivery sequencing in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical supervisory circuit ensuring deterministic reset assertion during power transitions and detecting firmware anomalies in safety-critical loops. Use Value: Valid RESET down to VCC = +1.2V prevents undefined states during battery-backed brownout; AEC-Q100-qualified variants support FDA design traceability. | Use Scenario: Monitors main 5V supply and firmware liveness in cellular-connected vehicle gateways requiring continuous uptime and remote diagnostics. IC Role / Device Role / Timing Role: Low-power supervisory IC enabling always-on watchdog supervision with minimal impact on battery standby current. Use Value: 23µA typical ICC allows multi-year operation on backup coin cells; WDPO pulse can trigger wake-up interrupt or log fault events before full reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT46-T | Same 4.63V reset threshold but H-suffix watchdog: 719ms fast / 1.3s slow timeout window | Designed for slower-firmware applications (e.g., HVAC controllers); not suitable for fast-response ECUs | Select MAX6324BUT46-T when watchdog response must occur within 100ms of missed WDI pulse |
| TLV809E46DBVR | Single-threshold reset IC (4.63V), no watchdog, push-pull RESET, 1.8–6V VCC range | Lacks windowed watchdog - suitable only for basic power-monitoring, not runtime code supervision | Choose TLV809E46DBVR only if system-level watchdog is implemented in firmware or separate hardware |
Compared with MAX6324HUT46-T and TLV809E46DBVR, the MAX6324BUT46-T uniquely delivers factory-trimmed 15ms/100ms windowed watchdog timing alongside precise 4.63V supervision - making it optimal for automotive and industrial systems requiring both rapid fault detection and robust power monitoring in one 6-pin SOT23 package.
Availability
MAX6324BUT46-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6324BUT46-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 designs precision analog, mixed-signal, and high-reliability semiconductor solutions for automotive, industrial, and medical applications.
The MAX6323/MAX6324 product line delivers microprocessor supervisory circuits with integrated windowed watchdog timers and laser-trimmed voltage thresholds - engineered specifically for safety-critical embedded systems demanding deterministic reset behavior and runtime firmware validation.
FAQ
What is the exact reset threshold voltage of the MAX6324BUT46-T?
The MAX6324BUT46-T has a nominal reset threshold of 4.63V, with guaranteed limits of 4.50V (min) to 4.75V (max) at –40°C to +125°C. This ±2.5% accuracy is factory-laser-trimmed and specified for +5.0V supply supervision. The "46" in the part number directly encodes this threshold per Maxim's ordering convention.
How does the windowed watchdog function in the MAX6324BUT46-T differ from standard watchdog timers?
The MAX6324BUT46-T implements a true min/max (windowed) watchdog: it triggers WDPO on both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >100ms). Unlike single-timeout watchdogs, this prevents false resets from timing jitter while reliably catching stuck loops or clock failures - a key requirement for ISO 26262-compliant automotive systems.
Can the MAX6324BUT46-T be used with a 3.3V microcontroller supply?
Yes, the MAX6324BUT46-T operates from VCC = 1.2V to 5.5V and its open-drain RESET and WDPO outputs can be pulled up to any voltage ≤+6V. For a 3.3V µC, connect RESET and WDPO pullups to 3.3V. However, its 4.63V reset threshold is optimized for +5.0V rails; for 3.3V supervision, consider MAX6324BUT31-T (3.08V threshold) instead.
What is the purpose of the MR pin on the MAX6324BUT46-T, and how should it be interfaced?
The MR (manual reset) pin on the MAX6324BUT46-T is an active-low input that asserts RESET and clears the watchdog timer when pulled low ≥1µs. It features internal pullup (~70kΩ typical) and 100ns glitch immunity, allowing direct connection to a momentary switch without external components. If unused, leave MR unconnected - the internal pullup holds it high.
Is the MAX6324BUT46-T qualified for automotive applications?
The MAX6324BUT46-T itself is not AEC-Q100 qualified; however, the pin-compatible MAX6324BUT46/V+T variant is AEC-Q100 grade 0 qualified (–40°C to +150°C junction). For automotive designs requiring qualification, specify the /V+T version. Both share identical electrical specs, watchdog timing, and reset threshold - only qualification testing and packaging differ.
MAX6324BUT46-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:
- 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
MAX6324BUT46-T FAQ
1.How can I place an order for MAX6324BUT46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324BUT46-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 MAX6324BUT46-T reliable?
The price and inventory of MAX6324BUT46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324BUT46-T is usually 5 days.
3.What payment methods are accepted for MAX6324BUT46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324BUT46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324BUT46-T?
MAX6324BUT46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324BUT46-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 MAX6324BUT46-T?
For technical support, including MAX6324BUT46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324BUT46-T requirements.
6.How does Aetrix verify that MAX6324BUT46-T is sourced from the original manufacturer or authorized distributors?
All MAX6324BUT46-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 MAX6324BUT46-T meets industry standards.
7.What is the process for return or replacement of MAX6324BUT46-T?
All MAX6324BUT46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324BUT46-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 MAX6324BUT46-T part is unused and in its original packaging.
Return procedure for MAX6324BUT46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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