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Analog Devices Inc./Maxim Integrated MAX6324GUT31-T
- Part No.:
- MAX6324GUT31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324GUT31-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,603
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Product details
Overview
MAX6324GUT31-T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, open-drain RESET output, and precision +3.08V reset threshold (±2.5% accuracy). It monitors VCC down to +1.2V, asserts RESET for ≥100ms after power-up, and delivers 1ms WDPO fault pulses on fast/slow watchdog timeouts. Used in automotive engine control units for fail-safe processor supervision.
For engineers reviewing the MAX6324GUT31-T datasheet, MAX6324GUT31-T pinout, MAX6324GUT31-T application, or MAX6324GUT31-T equivalent, key selection criteria include its factory-trimmed 3.08V reset threshold, G-suffix (719ms fast / 1.3s slow) watchdog timeout window, -40°C to +125°C operation, SOT23-6 package, and AEC-Q100-comparable robustness in safety-critical embedded systems.
Technical Context
The MAX6324GUT31-T implements a dual-window watchdog that detects both premature (faster than 719ms) and delayed (slower than 1.3s) WDI falling edges - not just missing pulses. Its internal comparator guarantees valid RESET assertion even as VCC decays to +1.2V, enabling reliable brownout detection in automotive power rails.
RESET is open-drain with guaranteed 0.4V VOL at 1.2mA sink, supporting level-shifting across supply domains; WDPO is also open-drain with 1ms pulse width and independent activation only when RESET is deasserted. MR input includes internal 50–85kΩ pullup and 100ns glitch immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +3.08V nominal (3.00V–3.15V range), ±2.5% accuracy over -40°C to +125°C - ensures stable reset point for +3.3V systems under voltage drift. |
| Watchdog Timeout (Fast/Slow) | 719ms / 1.3s (G-suffix), factory-laser-trimmed - defines precise timing window for detecting stuck or runaway firmware execution. |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V - enables always-on supervision in battery-backed or low-power automotive modules. |
| RESET Assertion Delay | ≥100ms after VCC rises above threshold and MR deasserts - provides sufficient hold time for µP initialization and clock stabilization. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive environments and industrial control cabinets. |
| VCC Range | +1.2V to +5.5V - supports valid RESET output down to ultralow supply levels, critical for graceful shutdown sequencing. |
| WDPO Pulse Width | 1ms typical - long enough to trigger NMI or latch logic, short enough to avoid interfering with normal reset timing. |
Pinout & Package
MAX6324GUT31-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 (50–85kΩ); 1µs minimum pulse width; resets watchdog timer and asserts RESET; tolerant of 100ns glitches. |
| 2 GND | Ground reference | Primary return path for RESET, WDPO, and internal comparators; must be low-impedance for noise immunity. |
| 3 WDI | Watchdog input | Falling-edge-triggered; clears internal timer; 300ns minimum pulse width; VIH = 0.75×VCC, VIL = 0.8V. |
| 4 VCC | Supply voltage input | Monitored reset source; bypass with ≥500pF capacitor; absolute max = +6.0V; operates down to +1.2V. |
| 5 WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault; active only when RESET is high; requires external pullup to ≤+6V. |
| 6 RESET | Active-low open-drain reset output | Asserted when VCC < 3.08V or MR low; holds ≥100ms after recovery; requires external pullup; VOL ≤ 0.4V @ 1.2mA. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed (min/max) watchdog | Detects both too-fast (719ms) and too-slow (1.3s) WDI transitions - prevents false resets from jitter while catching hung loops. |
| Guaranteed RESET validity to VCC = +1.2V | Ensures deterministic reset behavior during brownout and power-down sequences, critical for data retention and safe state entry. |
| Debounced MR input with internal pullup | Eliminates need for external RC network; supports direct switch connection; rejects 100ns transients without spurious reset. |
| Open-drain RESET and WDPO outputs | Enables bidirectional reset interfacing (e.g., with Motorola 68HC11) and level-shifting across supply domains (e.g., 3.3V VCC → 5V RESET rail). |
| AEC-Q100 comparable construction | Manufactured in Maxim's automotive-grade BiCMOS process; operates over full -40°C to +125°C range; qualified per stress test profiles. |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Real-time monitoring of diesel ECU main processor during cold cranking, where battery voltage dips below 6V and exhibits ripple. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during brownout and pulsing WDPO on firmware hang - acts as hardware safety layer independent of software. Use Value: Prevents unsafe actuator commands during undervoltage; 3.08V threshold matches +3.3V MCU supply tolerance; 1.3s slow timeout aligns with CAN message cycle timing. |
Use Scenario: Ensuring deterministic restart of distributed I/O controller after transient ESD event disrupts communication stack. IC Role / Device Role / Timing Role: Dual-role supervisor: VCC monitor triggers hard reset, while WDPO pulse signals watchdog fault to host controller via dedicated interrupt line. Use Value: Enables root-cause diagnostics without full system reboot; open-drain WDPO interfaces directly to 24V PLC logic; 100ms RESET delay satisfies IEC 61000-4-5 surge recovery timing. |
| Medical Infusion Pump Controller | Railway Signaling Interface Board |
|
Use Scenario: Fail-safe supervision of ARM-based pump controller managing motor drive and pressure sensing in battery-operated portable unit. IC Role / Device Role / Timing Role: Hardware-enforced watchdog with min/max window prevents silent firmware lockup that could cause over-delivery; RESET holds during battery swap. Use Value: Meets IEC 62304 Class C requirements; 23µA quiescent current extends battery life; 3.08V threshold avoids nuisance resets during Li-ion discharge curve. |
Use Scenario: Monitoring legacy 8051-based signaling logic in trackside relay interface where EMI induces sporadic code jumps. IC Role / Device Role / Timing Role: Independent watchdog with 719ms fast timeout detects instruction pointer corruption before safety-critical outputs change state. Use Value: Complies with EN 5012x SIL-2; SOT23-6 footprint fits constrained PCB space; -40°C to +125°C rating survives rail-side thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT31-T | Same 3.08V reset threshold, but H-suffix watchdog (543ms fast / 1.3s slow) - tighter fast-window tolerance. | Better suited for applications requiring faster fault detection (e.g., real-time motor control loops). | Select MAX6324HUT31-T if 543ms fast timeout improves response to timing violations without increasing false positives. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold (±0.5%), no windowed watchdog - only basic timeout watchdog with adjustable delay. | Lacks min/max timing detection; suitable for simpler systems where only missing-pulse detection is required. | Choose TPS3808G33DBVR for cost-sensitive industrial designs where windowed watchdog is unnecessary and tighter reset accuracy is preferred. |
Compared with MAX6324GUT31-T, MAX6324HUT31-T offers faster fault response within the same reset threshold family, while TPS3808G33DBVR trades windowed watchdog capability for higher reset accuracy and lower BOM count - making it viable only where dual-window detection adds no safety value.
Availability
MAX6324GUT31-T is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC I/O, medical infusion pumps, and railway signaling applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6324GUT31-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 MAX6324GUT31-T belongs to Maxim's μP supervisory product line, engineered specifically for safety-critical embedded systems requiring deterministic reset behavior, robust watchdog supervision, and operation across harsh environmental conditions.
FAQ
What is the exact reset threshold voltage of MAX6324GUT31-T and how stable is it over temperature?
The MAX6324GUT31-T has a nominal reset threshold of +3.08V, with guaranteed range of +3.00V to +3.15V (±2.5%) across -40°C to +125°C. Typical operating characteristics show normalized threshold variation ≤±0.3% over temperature, confirming high stability for +3.3V system supervision without calibration.
Does MAX6324GUT31-T support connection to multiple supply domains via its open-drain outputs?
Yes. The open-drain RESET and WDPO outputs of MAX6324GUT31-T can each be pulled up to independent voltage rails up to +6V - enabling level-shifting, such as using a 3.3V VCC supply while driving a 5V RESET line or routing WDPO to a 24V interrupt input, provided pullup resistor values respect sink current limits.
How does the windowed watchdog in MAX6324GUT31-T differ from standard timeout watchdogs?
Unlike standard single-timer watchdogs, the MAX6324GUT31-T implements a true min/max window: it triggers WDPO on WDI falling edges occurring either too soon (<719ms) or too late (>1.3s) relative to the prior edge. This detects both runaway loops and premature resets - critical for deterministic firmware validation.
Can MAX6324GUT31-T operate reliably during automotive battery brownout events?
Yes. MAX6324GUT31-T guarantees valid RESET assertion down to VCC = +1.2V and operates across +1.2V to +5.5V. Its 3.08V reset threshold and 100ms minimum reset timeout ensure clean, unambiguous reset during cranking-induced dips - a key requirement for ISO 16750-2 compliance.
What is the function of the MR pin on MAX6324GUT31-T and does it require an external pullup?
The MR pin on MAX6324GUT31-T is an active-low manual reset input with internal 50–85kΩ pullup to VCC, so no external resistor is needed. Holding MR low for ≥1µs asserts RESET and clears the watchdog timer; after release, RESET remains asserted for ≥100ms - ideal for front-panel reset buttons or system-level fault signals.
MAX6324GUT31-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:
- 3.08V
- 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
MAX6324GUT31-T FAQ
1.How can I place an order for MAX6324GUT31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324GUT31-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 MAX6324GUT31-T reliable?
The price and inventory of MAX6324GUT31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324GUT31-T is usually 5 days.
3.What payment methods are accepted for MAX6324GUT31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324GUT31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324GUT31-T?
MAX6324GUT31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324GUT31-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 MAX6324GUT31-T?
For technical support, including MAX6324GUT31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324GUT31-T requirements.
6.How does Aetrix verify that MAX6324GUT31-T is sourced from the original manufacturer or authorized distributors?
All MAX6324GUT31-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 MAX6324GUT31-T meets industry standards.
7.What is the process for return or replacement of MAX6324GUT31-T?
All MAX6324GUT31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324GUT31-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 MAX6324GUT31-T part is unused and in its original packaging.
Return procedure for MAX6324GUT31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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