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Analog Devices Inc./Maxim Integrated MAX6824LUK+
- Part No.:
- MAX6824LUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6824LUK+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:502
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Product details
Overview
MAX6824LUK+ from Maxim Integrated is a low-voltage microprocessor supervisory IC in 5-pin SOT23 package, combining voltage monitoring (4.63V threshold), watchdog timer (1.6s timeout), and dual push-pull reset outputs (RESET and RESET). It asserts reset during power-up, brownout, or software hang, with guaranteed operation down to VCC = +1.0V - used in set-top boxes, embedded controllers, and portable equipment requiring reliable µP supervision.
For engineers reviewing the MAX6824LUK+ datasheet, MAX6824LUK+ pinout, MAX6824LUK+ application, or MAX6824LUK+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for critical µP monitoring designs.
Technical Context
The MAX6824LUK+ integrates a precision voltage monitor with ±2% threshold accuracy at 4.63V, a 1.6s watchdog timer cleared by WDI edge transitions, and two independent push-pull reset outputs - one active-low (RESET), one active-high (RESET) - enabling flexible interface with bidirectional or level-sensitive µP reset pins. No external components are required.
Its internal 50kΩ MR pullup resistor supports CMOS- or open-drain-driven manual reset, while VCC supply current remains ≤30µA over –40°C to +125°C. Reset assertion is guaranteed valid even when VCC drops to +1.0V, and the device rejects negative VCC transients ≤20µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2% - precisely monitors +5V rails without external resistors |
| Reset Timeout Period | 140ms min - ensures µP completes power-up initialization before release |
| Watchdog Timeout | 1.6s nominal - detects firmware hangs in real-time embedded applications |
| Supply Current | ≤30µA at –40°C to +125°C - enables battery-powered longevity |
| Operating Voltage Range | +1.2V to +5.5V - supports ultra-low-VCC operation during brownout recovery |
| Reset Output Drive | Push-pull RESET (active-low) and RESET (active-high) - eliminates need for external pullups/pulldowns |
| MR Input | Internal 50kΩ pullup - allows direct switch-to-GND connection without debounce circuitry |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline), RoHS-compliant, footprint compatible with standard 0.95mm pitch land pattern (Maxim land pattern no. 21-0057).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives low during fault; releases high after timeout |
| 2 | GND | Ground reference - shared return for all internal circuits and reset outputs |
| 3 | WDI | Watchdog input - toggling within 1.6s prevents reset; unconnected disables watchdog |
| 4 | RESET | Active-high push-pull reset output - complements RESET for logic-level flexibility |
| 5 | VCC | Supply and monitored voltage input - powers device and sets reset trigger point at 4.63V |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Enables direct interface with both active-low and active-high µP reset inputs without external logic |
| Guaranteed reset validity to VCC = +1.0V | Ensures fail-safe reset assertion during deep brownout conditions where other supervisors fail |
| 1.6s watchdog timer with edge-triggered clear | Prevents false timeouts from static WDI states; supports robust firmware health checking |
| No external components required | Reduces BOM count and PCB area - full supervision in 2.9mm × 1.6mm SOT23 package |
| Immunity to ≤20µs negative VCC transients | Eliminates spurious resets from switching noise or ESD-induced rail dips |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
Use Scenario: Power sequencing and firmware crash recovery in consumer media gateways with multi-rail supplies. IC Role / Device Role / Timing Role: Supervisory IC asserting synchronized reset to main SoC and peripheral controllers upon 5V rail undervoltage or watchdog timeout. Use Value: Prevents corrupted channel tuning or HDMI handshake failures by enforcing clean restart after brownout or hang. |
Use Scenario: Industrial PLC modules operating in temperature-variable environments with intermittent power. IC Role / Device Role / Timing Role: Dual-reset supervisor providing both active-low and active-high signals to ARM Cortex-M4 and FPGA configuration logic. Use Value: Enables deterministic boot state across heterogeneous logic domains using single compact IC. |
| Intelligent Instruments | Portable/Battery-Powered Equipment |
Use Scenario: Handheld multimeters and data loggers requiring long battery life and field reliability. IC Role / Device Role / Timing Role: Low-quiescent-current (≤30µA) supervisor monitoring 3.3V analog front-end and 1.8V MCU core rails. Use Value: Extends runtime while guaranteeing reset assertion down to 1.0V - critical for accurate ADC calibration during low-battery shutdown. |
Use Scenario: Wearable health monitors with coin-cell power and aggressive sleep/wake cycles. IC Role / Device Role / Timing Role: Watchdog-enabled supervisor detecting firmware lockup during BLE advertising intervals or sensor polling loops. Use Value: Recovers device autonomously without user intervention, maintaining clinical-grade uptime compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6821LUK+ | Same 4.63V threshold and SOT23-5 package, but features open-drain RESET (not push-pull) and includes MR input - lacks second push-pull RESET output | Suitable where only one reset polarity is needed and external pullup is acceptable; not drop-in for dual-output designs | Select MAX6821LUK+ only if system requires manual reset and open-drain flexibility, not dual push-pull drive |
| MAX6316LUK+ | Pin-compatible SOT23-5, 4.63V threshold, 140ms timeout, but no watchdog timer and single active-low reset output | Applicable in simpler systems where software hang detection is handled externally or unnecessary | Choose MAX6316LUK+ when watchdog functionality is omitted from system architecture to reduce cost and complexity |
Compared with MAX6824LUK+, MAX6821LUK+ provides manual reset and open-drain flexibility but lacks the second push-pull output, while MAX6316LUK+ removes watchdog capability entirely - making MAX6824LUK+ uniquely suited for space-constrained designs needing dual-polarity reset and autonomous firmware supervision.
Availability
MAX6824LUK+ is available at Aetrix Electronics and suitable for set-top boxes, embedded controllers, and intelligent instruments requiring stable component supply, long-term industrial temperature support (–40°C to +125°C), and RoHS-compliant packaging.
Supply support for MAX6824LUK+ 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, computing, and communications applications.
The MAX682x family targets low-voltage µP supervision in space-constrained systems, delivering integrated voltage monitoring, watchdog, and reset generation in minimal SOT23 footprint - optimized for reliability-critical embedded control.
FAQ
What is the reset threshold voltage of the MAX6824LUK+?
The MAX6824LUK+ has a factory-trimmed reset threshold of 4.63V ±2%, designed specifically for monitoring +5V power rails. This value is fixed by the 'L' suffix in the part number and is guaranteed over the full –40°C to +125°C operating range. The threshold hysteresis is 2×VTH (≈9.26mV), preventing chatter near the trip point.
Does the MAX6824LUK+ include a manual reset input (MR)?
No, the MAX6824LUK+ does not include a manual reset input. Per the Selector Guide and Pin Description, MAX6824 variants omit MR functionality - unlike MAX6821/MAX6822/MAX6823/MAX6825. The MAX6824LUK+ relies solely on VCC monitoring and watchdog timeout for reset initiation, with no provision for external MR assertion.
What are the functions of the two reset outputs on the MAX6824LUK+?
The MAX6824LUK+ provides two independent push-pull reset outputs: pin 1 is RESET (active-low), and pin 4 is RESET (active-high). During fault conditions (VCC < 4.63V, watchdog timeout), RESET goes low while RESET goes high - enabling simultaneous interface with µPs requiring either polarity. Both outputs remain asserted for ≥140ms after VCC recovers.
How is the watchdog timer enabled or disabled on the MAX6824LUK+?
The watchdog timer on the MAX6824LUK+ is enabled by driving the WDI pin (pin 3) with periodic edges - a rising or falling transition clears the 1.6s timer. To disable it, leave WDI unconnected or tri-state its driver; the internal circuitry then services the timer every ~1.4s, preventing timeout. No configuration register or external signal is required.
Is the MAX6824LUK+ compatible with 1.8V or 2.5V supply rails?
No, the MAX6824LUK+ is not intended for direct monitoring of 1.8V or 2.5V rails. Its 4.63V threshold is fixed for +5V systems. For lower rails, select other MAX682x variants (e.g., MAX6824TUK+ for 3.08V or MAX6824SUK+ for 2.93V). Using MAX6824LUK+ on sub-4.6V supplies would prevent reset assertion under undervoltage conditions.
MAX6824LUK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
MAX6824LUK+ FAQ
1.How can I place an order for MAX6824LUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6824LUK+ 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 MAX6824LUK+ reliable?
The price and inventory of MAX6824LUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6824LUK+ is usually 5 days.
3.What payment methods are accepted for MAX6824LUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6824LUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6824LUK+?
MAX6824LUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6824LUK+ 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 MAX6824LUK+?
For technical support, including MAX6824LUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6824LUK+ requirements.
6.How does Aetrix verify that MAX6824LUK+ is sourced from the original manufacturer or authorized distributors?
All MAX6824LUK+ 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 MAX6824LUK+ meets industry standards.
7.What is the process for return or replacement of MAX6824LUK+?
All MAX6824LUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6824LUK+, 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 MAX6824LUK+ part is unused and in its original packaging.
Return procedure for MAX6824LUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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