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Analog Devices Inc./Maxim Integrated MAX6324EUT46-T
- Part No.:
- MAX6324EUT46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6324EUT46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6324EUT46-T from Maxim Integrated is a microprocessor supervisory IC 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 during brownout or manual reset, and pulses WDPO low for 1ms upon fast/slow watchdog timeout faults. Guaranteed operation down to VCC = +1.2V.
For engineers reviewing the MAX6324EUT46-T datasheet, MAX6324EUT46-T pinout, MAX6324EUT46-T application, or MAX6324EUT46-T equivalent, key selection criteria include its 6-pin SOT23 package, -40°C to +125°C operating range, 100ms minimum reset timeout, E-suffix 15ms/60s watchdog window, and open-drain compatibility with bidirectional μP reset pins.
Technical Context
The MAX6324EUT46-T implements a dual-window watchdog that detects both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >60s), using internal laser-trimmed timing. Its reset comparator guarantees valid output down to VCC = +1.2V, with hysteresis and glitch immunity on MR and WDI inputs.
This device uses BiCMOS process technology (1371 transistors) and features debounced manual reset input with 1μs minimum pulse width, 100ns glitch rejection, and internal 50–85kΩ MR pullup. The open-drain RESET and WDPO outputs support level-shifting across supply domains up to +6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (4.50V–4.75V range), ±2.5% accuracy over -40°C to +125°C - ensures reliable brownout detection for +5.0V systems. |
| Watchdog Timeout (Fast/Slow) | 15ms / 60s (E-suffix), factory-laser-trimmed - enables precise windowed monitoring of μP instruction timing without external components. |
| RESET Assertion Delay | ≥100ms after VCC rise above threshold and MR deassertion - provides sufficient hold time for μP initialization and memory stabilization. |
| Supply Current | 23µA typical at VCC = 2.5V/3.3V - enables low-power operation in battery-backed or energy-constrained embedded systems. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial control, and medical equipment environments. |
| VCC Range | 1.2V to 5.5V - supports valid RESET assertion even during deep brownout, critical for fail-safe system recovery. |
| WDPO Pulse Width | 1ms typical - delivers unambiguous fault signal to NMI or diagnostic logic without requiring external timing circuitry. |
Pinout & Package
MAX6324EUT46-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), optimized for space-constrained PCB layouts and high-temperature operation (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; requires low-inductance connection to minimize noise coupling. |
| 3 - WDI | Watchdog input | Falling-edge-triggered; resets internal timer; must be driven by μP I/O with ≥300ns pulse width and 0.75×VCC VIH. |
| 4 - VCC | Supply voltage input | Monitored for reset generation; bypass with ≥500pF capacitor near pin to suppress transients and ensure stable operation. |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms on fast/slow fault; requires external pullup to ≤+6V; inactive while RESET is asserted. |
| 6 - RESET | Active-low open-drain reset output | Asserted when VCC < 4.63V or MR low; requires external pullup; compatible with bidirectional μP reset pins (e.g., 68HC11). |
Key Features
| Feature | Design Value |
|---|---|
| Windowed (Min/Max) Watchdog | Simultaneously detects both premature and delayed WDI transitions - prevents false resets from jitter while catching stalled execution. |
| Factory-Trimmed Reset Threshold | 4.63V ±2.5% accuracy eliminates need for external resistor dividers or calibration - reduces BOM count and layout complexity. |
| Open-Drain RESET Output | Enables direct interface with bidirectional μP reset pins and level-shifting across supply domains - simplifies multi-rail system design. |
| Guaranteed Operation to VCC = +1.2V | Ensures deterministic reset behavior during deep brownout - critical for safety-critical automotive and medical applications. |
| Debounced Manual Reset Input | Internal pullup and 100ns glitch rejection eliminate need for external RC network - saves board space and improves reliability. |
| Low Quiescent Current | 23µA typical enables use in always-on subsystems without compromising battery life - suitable for telematics and sensor nodes. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Mainboard |
|---|---|
|
Use Scenario: Monitoring microcontroller activity and +5V supply integrity in engine management systems exposed to wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and windowed watchdog supervision of main MCU firmware execution. Use Value: Prevents unsafe operation due to software lockup or supply sag; 125°C rating and AEC-Q100-aligned qualification ensure reliability in under-hood environments. |
Use Scenario: Ensuring deterministic startup and runtime supervision of programmable logic controllers in factory automation cabinets. IC Role / Device Role / Timing Role: System-level supervisor generating clean reset pulse and detecting abnormal watchdog timing in real-time control loops. Use Value: Eliminates need for external timing components; 100ms reset timeout aligns with industrial μP boot sequences; open-drain RESET supports shared reset bus architecture. |
| Medical Infusion Pump Controller | Embedded Telematics Module |
|
Use Scenario: Safeguarding life-critical drug delivery logic against processor hang or power anomaly in portable infusion devices. IC Role / Device Role / Timing Role: Fail-safe supervisor asserting hardware reset and pulsing WDPO to trigger diagnostics upon detected timing violation. Use Value: 4.63V reset threshold matches +5V rail tolerance; guaranteed RESET validity to VCC = +1.2V ensures safe shutdown even during severe brownout. |
Use Scenario: Maintaining robust operation of cellular-connected vehicle tracking units powered by automotive battery with wide voltage variation. IC Role / Device Role / Timing Role: Dual-role supervisor monitoring VCC and validating μP liveness via periodic WDI pulses in low-power sleep/wake cycles. Use Value: 23µA quiescent current minimizes standby drain; E-suffix 15ms/60s watchdog window accommodates variable wake-up intervals without false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324EUT44-T | 4.38V nominal reset threshold (4.25V–4.50V range); identical watchdog window (E-suffix), package, and temperature range. | Targeted at +4.5V or regulated +5V systems with tighter supply tolerance; not suitable for nominal +5.0V rails requiring 4.63V trip point. | Select when system VCC nominal is 4.5V or when margin analysis shows 4.38V threshold better avoids nuisance resets. |
| TLV809E33DBVR | Fixed 3.3V reset threshold, no watchdog function, push-pull RESET, 3-pin SOT23 package. | Only provides basic power-on/brownout reset; lacks windowed watchdog, manual reset input, and WDPO fault signaling capability. | Choose only if watchdog supervision is unnecessary and system operates at 3.3V; not a functional substitute for MAX6324EUT46-T. |
Compared with MAX6324EUT44-T, the MAX6324EUT46-T provides higher reset threshold for stricter +5.0V rail monitoring; compared with TLV809E33DBVR, it adds full windowed watchdog supervision, manual reset, and fault-pulse signaling - essential for safety-critical and autonomous operation.
Availability
MAX6324EUT46-T is available at Aetrix Electronics and suitable for automotive engine control, industrial PLCs, medical infusion pumps, and embedded telematics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6324EUT46-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 highly integrated microprocessor supervisory solutions with windowed watchdogs and accurate reset thresholds - engineered specifically for fail-safe operation in harsh environments where deterministic reset behavior is non-negotiable.
FAQ
What is the exact reset threshold voltage of MAX6324EUT46-T?
The MAX6324EUT46-T has a factory-laser-trimmed nominal reset threshold of 4.63V, with guaranteed range of 4.50V to 4.75V over -40°C to +125°C. This value is specified in the Electrical Characteristics table and corresponds to the "46" suffix in the part number, making MAX6324EUT46-T suitable for precise supervision of +5.0V power rails.
Does MAX6324EUT46-T support windowed watchdog functionality?
Yes, MAX6324EUT46-T implements a true min/max (windowed) watchdog that detects both fast faults (WDI falling edges closer than 15ms) and slow faults (no WDI edge longer than 60s). This dual-window capability is enabled by the "E" suffix and is confirmed in the Watchdog Timeout table and Detailed Description section of the datasheet.
What is the function of the WDPO pin on MAX6324EUT46-T?
The WDPO (Watchdog Pulse Output) pin on MAX6324EUT46-T is an open-drain output that pulses low for 1ms (typical) upon detection of either a fast or slow watchdog fault. It remains inactive while RESET is asserted and requires an external pullup resistor to any supply up to +6V - enabling direct connection to NMI inputs or diagnostic logic without additional buffering.
Can MAX6324EUT46-T operate reliably at high temperature?
Yes, MAX6324EUT46-T is fully specified for continuous operation from -40°C to +125°C, with absolute maximum junction temperature of +150°C. Its thermal resistance (θJA = 115°C/W on multilayer board) and BiCMOS process ensure stable performance in under-hood automotive and industrial control environments where ambient temperatures exceed 100°C.
How does the manual reset (MR) input behave on MAX6324EUT46-T?
The MR input on MAX6324EUT46-T is active-low, internally pulled up to VCC (50–85kΩ), and debounced with 100ns glitch immunity. Asserting MR low for ≥1μs forces RESET low and clears the watchdog timer. After MR release, RESET remains asserted for ≥100ms - ensuring μP reset hold time meets industry-standard requirements.
MAX6324EUT46-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
MAX6324EUT46-T FAQ
1.How can I place an order for MAX6324EUT46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6324EUT46-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 MAX6324EUT46-T reliable?
The price and inventory of MAX6324EUT46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6324EUT46-T is usually 5 days.
3.What payment methods are accepted for MAX6324EUT46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6324EUT46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6324EUT46-T?
MAX6324EUT46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6324EUT46-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 MAX6324EUT46-T?
For technical support, including MAX6324EUT46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6324EUT46-T requirements.
6.How does Aetrix verify that MAX6324EUT46-T is sourced from the original manufacturer or authorized distributors?
All MAX6324EUT46-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 MAX6324EUT46-T meets industry standards.
7.What is the process for return or replacement of MAX6324EUT46-T?
All MAX6324EUT46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6324EUT46-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 MAX6324EUT46-T part is unused and in its original packaging.
Return procedure for MAX6324EUT46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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