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Analog Devices Inc./Maxim Integrated MAX824LEUK+T
- Part No.:
- MAX824LEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX824LEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,518
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Product details
Overview
MAX824LEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low and active-high reset outputs, watchdog timer (1.6s timeout), and precision +4.63V reset threshold. It operates from -40°C to +125°C, draws 3–8µA supply current, and guarantees RESET validity down to VCC = 1V. Used in automotive systems and critical µP monitoring where robust power-supply transient immunity and dual-reset polarity are required.
For engineers reviewing the MAX824LEUK+T datasheet, MAX824LEUK+T pinout, MAX824LEUK+T application, or MAX824LEUK+T equivalent, key selection criteria include its dual-reset output configuration, 140ms min power-on reset timeout, ±40ppm/°C reset threshold temperature coefficient, and compatibility with bidirectional µP reset pins requiring up to 800µA pullup current.
Technical Context
The MAX824LEUK+T integrates a precision voltage comparator with hysteresis (10mV for L/M suffix), a 1.6s watchdog timer cleared by WDI edge transitions, and independent active-low (RESET) and active-high (RESET) outputs. Its reset generator ensures monotonic assertion during VCC ramp-up and brownout recovery, with propagation delay under 20µs at VCC falling through VRST − 100mV.
It features internal MR pullup (52kΩ), WDI input designed for three-stated drivers (≤10µA leakage, ≤200pF load), and guaranteed operation across full industrial and extended temperature ranges without external components-enabling direct integration into space-constrained embedded controllers and battery-powered instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +4.63V (±1.5% over temp); sets precise brownout detection point for +5V systems |
| Reset Timeout | 140–280ms; ensures µP initialization completes before release |
| Watchdog Timeout | 1.12–2.40s; provides fail-safe software execution monitoring |
| Supply Current | 3–8µA (SOT23); enables ultra-low-power operation in battery-backed systems |
| Operating Temp | -40°C to +125°C; supports under-hood automotive and industrial environments |
| VCC Range | +4.5V to +5.5V; matches standard +5V rail tolerances |
| Reset Hysteresis | 10mV; prevents chatter during slow VCC recovery near threshold |
Pinout & Package
Package: SOT23-5 (lead-free, RoHS-compliant, 5-pin surface-mount).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts low for ≥140ms on power-up/brownout; sinks 3.2mA, sources 800µA |
| 2 - GND | Ground reference | Common return for all internal circuits; requires low-impedance PCB connection |
| 3 - WDI | Watchdog input | Edge-sensitive; toggling within 1.6s prevents reset; unconnected disables watchdog |
| 4 - RESET | Active-high reset output | Inverse of pin 1; provides complementary signal for logic-level translation or dual-input µPs |
| 5 - VCC | Power supply input | Accepts +4.5V to +5.5V; internally decoupled; requires 0.1µF local bypass |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low and active-high signals eliminate need for external inverters in mixed-logic systems |
| 1.6s watchdog timer | Configurable via WDI edge detection; immune to noise-induced false triggers due to 50ns minimum pulse width requirement |
| +4.63V precision threshold | Guaranteed ±1.5% tolerance over -40°C to +125°C enables reliable +5V rail monitoring without calibration |
| 1V VCC reset guarantee | Ensures deterministic reset behavior even during deep brownout or backup-battery switchover |
| No external components | Integrates pullup resistor on MR (not applicable here), internal oscillator, and comparator-reducing BOM count and layout area |
Applications
| Automotive Engine Control Units | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring +5V main supply in ECU modules exposed to wide temperature swings and load-dump transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting dual-reset signals to MCU during cold cranking (VCC dip) or alternator ripple events. Use Value: Prevents erratic MCU behavior by guaranteeing reset assertion down to VCC = 1V and rejecting fast transients per typical operating characteristics graph toc06. | Use Scenario: Ensuring deterministic startup and fault recovery in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Generating synchronized active-low and active-high reset pulses to FPGA and ARM-based control processors during power cycling. Use Value: Eliminates need for discrete level-shifting circuitry while maintaining 140ms minimum reset hold time compliant with IEC 61131-2. |
| Medical Diagnostic Handhelds | Ruggedized Data Loggers |
Use Scenario: Power sequencing and brownout protection in portable ultrasound or ECG devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Reset supervisor interfacing with bidirectional µP reset pins (e.g., Cortex-M series) requiring 800µA pullup capability. Use Value: Enables safe low-voltage operation down to 1V VCC and supports watchdog-triggered recovery from firmware hangs without external components. | Use Scenario: Long-term field deployment in remote environmental sensors subject to thermal cycling and ESD events. IC Role / Device Role / Timing Role: Providing temperature-stable reset threshold (±40ppm/°C) and transient-immune supervision for MSP430-based data acquisition. Use Value: Maintains reset accuracy across -40°C to +125°C range and rejects sub-µs VCC glitches per absolute maximum ratings and toc06 characterization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX824MEUK+T | Reset threshold = +4.38V; otherwise identical pinout, timing, and temperature rating | Suitable for +3.3V/5V hybrid rails where tighter margin below 4.63V is needed | Select when system brownout threshold must align with +4.38V instead of +4.63V |
| TPS3808G33DBVR | Single active-low reset; 3.3V fixed threshold; 200ms timeout; -40°C to +125°C; SOT23-5 | Lacks active-high output and watchdog; lower quiescent current (1.1µA) | Choose for cost-sensitive, non-watchdog applications requiring only basic 3.3V supervision |
Compared with MAX824LEUK+T, MAX824MEUK+T offers identical functionality at a different reset voltage, while TPS3808G33DBVR reduces feature set but improves power efficiency-making it suitable only where dual-reset polarity and watchdog are unnecessary.
Availability
MAX824LEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC controllers, and medical diagnostic handhelds requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX824LEUK+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 high-performance analog and mixed-signal ICs for precision sensing, power management, and interface applications.
The MAX823/MAX824/MAX825 family delivers integrated microprocessor supervision with reset, watchdog, and manual reset functions in miniature 5-pin packages for space-constrained embedded systems.
FAQ
What is the reset threshold voltage of the MAX824LEUK+T?
The MAX824LEUK+T has a factory-trimmed reset threshold of +4.63V, specified with ±1.5% tolerance over the full -40°C to +125°C operating temperature range. This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, where VRST min/max values are listed as 4.56V/4.70V at temperature extremes. The L suffix explicitly denotes the 4.63V variant.
Does the MAX824LEUK+T provide both active-low and active-high reset outputs?
Yes, the MAX824LEUK+T provides two independent reset outputs: pin 1 (RESET) is active-low, and pin 4 (RESET) is active-high-complementary to each other. This dual-output architecture is a defining feature of the MAX824 series, enabling direct interface with µPs or FPGAs that require either polarity without external inversion. The functional diagram and Pin Description table confirm this configuration.
What is the watchdog timeout period for the MAX824LEUK+T?
The MAX824LEUK+T watchdog timeout period is 1.12s (minimum), 1.60s (typical), and 2.40s (maximum) at TA = -40°C to +125°C. This specification is documented in the Electrical Characteristics table under "Watchdog Timeout Period (tWD)" and is consistent across all MAX824 variants regardless of reset threshold suffix. The watchdog is disabled if the WDI pin is left unconnected or driven by a three-stated output.
Can the MAX824LEUK+T operate with VCC as low as 1V?
Yes, the MAX824LEUK+T guarantees valid reset output state (logic low on RESET, logic high on RESET) for VCC down to 1V, as stated in the General Description and verified in the Electrical Characteristics table under "RESET Output Voltage" test conditions. This capability ensures reliable operation during deep brownout or battery backup scenarios where VCC may collapse below nominal levels.
What package type and lead finish does the MAX824LEUK+T use?
The MAX824LEUK+T uses the 5-pin SOT23-5 package with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix in the part number. The Ordering Information section confirms "EUK" denotes SOT23-5 packaging and "+T" specifies lead-free tape-and-reel delivery. Package dimensions and outline are defined in Maxim's SOT-23 5L drawing (21-0057).
MAX824LEUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX824LEUK+T FAQ
1.How can I place an order for MAX824LEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX824LEUK+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 MAX824LEUK+T reliable?
The price and inventory of MAX824LEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX824LEUK+T is usually 5 days.
3.What payment methods are accepted for MAX824LEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX824LEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX824LEUK+T?
MAX824LEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX824LEUK+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 MAX824LEUK+T?
For technical support, including MAX824LEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX824LEUK+T requirements.
6.How does Aetrix verify that MAX824LEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX824LEUK+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 MAX824LEUK+T meets industry standards.
7.What is the process for return or replacement of MAX824LEUK+T?
All MAX824LEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX824LEUK+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 MAX824LEUK+T part is unused and in its original packaging.
Return procedure for MAX824LEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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