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Analog Devices Inc./Maxim Integrated MAX6824WUK
- Part No.:
- MAX6824WUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6824WUK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
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Product details
Overview
MAX6824WUK from Maxim Integrated is a low-voltage microprocessor supervisory IC in 5-pin SOT23 package, combining voltage monitoring (1.67V threshold), watchdog timer (1.6s timeout), and dual push-pull reset outputs (RESET and RESET). It asserts reset during VCC brownout, manual trigger, or watchdog timeout, with guaranteed reset validity down to VCC = +1.0V. Used in portable battery-powered equipment and embedded controllers for reliable power-on reset and fault recovery.
For engineers reviewing the MAX6824WUK datasheet, MAX6824WUK pinout, MAX6824WUK application, or MAX6824WUK equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing behavior, validated watchdog interaction, and real-world selection guidance for µP supervision in space-constrained, low-voltage systems.
Technical Context
The MAX6824WUK implements a dual-output reset architecture: active-low push-pull RESET and active-high push-pull RESET, both asserted simultaneously on VCC drop below 1.67V, MR assertion, or WDI timeout. Its watchdog timer clears on any WDI edge and times out after 1.6s nominal if no transition occurs.
Reset assertion is guaranteed valid down to VCC = +1.0V, and the device operates across -40°C to +125°C with supply current as low as 5µA at +1.8V. The internal 50kΩ MR pullup enables direct switch-to-GND connection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.67V ±0.05V - precisely monitors 1.6V–1.7V rails common in ultra-low-voltage logic and battery systems |
| Reset Timeout Period | 140ms (min) - ensures µP remains held in reset long enough for stable power rail recovery |
| Watchdog Timeout | 1.6s (nominal) - provides robust software execution monitoring without excessive false triggers |
| Operating Voltage Range | +1.53V to +2.0V - supports operation directly from single LiFePO₄ or two alkaline cells |
| Reset Output Type | Dual push-pull: RESET (active-low), RESET (active-high) - eliminates need for external level-shifting or pull-up resistors |
| VCC Validity Range | Reset guaranteed functional down to VCC = +1.0V - maintains supervision integrity during deep brownout |
| MR Input Pullup | 50kΩ internal - allows direct momentary switch interface with no external components |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, footprint compatible with industry-standard 5-lead SOT-23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output asserted low during reset condition; drives µP /RESET pin directly |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | WDI | Watchdog input; rising or falling edge clears 1.6s timer; unconnected disables watchdog |
| 4 | RESET (active-high) | Push-pull output asserted high during reset condition; interfaces with /RESET-inverted logic |
| 5 | VCC | Supply and monitored voltage input; reset threshold referenced to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Eliminates external pull-up/pull-down resistors and simplifies interface to both standard and inverted µP reset inputs |
| 1.67V reset threshold | Enables supervision of modern ultra-low-voltage I/O domains (e.g., 1.8V core with 1.6V LDO output) |
| 1.6s watchdog timeout | Matches typical firmware loop durations in deeply embedded applications while avoiding spurious timeouts from noise |
| No external components required | Reduces BOM count and PCB area; internal MR pullup and precise threshold eliminate trimming resistors or capacitors |
| Valid reset down to VCC = +1.0V | Ensures system-level reliability during severe brownout conditions where other supervisors may release reset prematurely |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
Use Scenario: Wearable ECG sensor operating from single 1.8V Li-ion cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 1.6V analog front-end supply and asserts dual reset signals to MCU and ADC during brownout or firmware hang. Use Value: Prevents corrupted sensor data capture by holding system in known state until VCC stabilizes above 1.67V and watchdog confirms firmware liveness. | Use Scenario: Sub-GHz wireless sensor node powered by two AA alkalines, duty-cycled to extend battery life. IC Role / Device Role / Timing Role: Monitors 1.65V regulated rail and triggers watchdog reset if sleep/wake scheduling fails due to code corruption. Use Value: Guarantees automatic recovery without user intervention, even when VCC dips to 1.5V during pulse load, thanks to 1.0V reset validity. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted I/O expander with isolated CAN interface and local 1.8V logic supply. IC Role / Device Role / Timing Role: Provides fail-safe reset coordination between main controller and isolated peripheral ASIC using both RESET and RESET outputs. Use Value: Enables simultaneous reset assertion across multiple voltage domains without timing skew or external logic gates. | Use Scenario: Door module with LIN transceiver and 1.6V microcontroller core, exposed to automotive load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Detects negative VCC glitches >100mV amplitude and suppresses false resets via inherent transient immunity. Use Value: Maintains functional safety compliance by preventing unintended MCU restart during engine cranking events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6823WUK | Single active-low push-pull RESET output; includes MR input but no WDI | Lacks watchdog functionality; suitable only for systems with software-based fault detection | Select when watchdog capability is unnecessary and board space permits simpler supervision |
| TPS3808G16DBVR | Single open-drain RESET output; 1.6V threshold; no MR or WDI; 200ms timeout | Requires external pull-up resistor; no manual reset or watchdog features | Choose for cost-sensitive, minimal-feature applications where dual reset outputs and watchdog are not required |
Compared with MAX6823WUK and TPS3808G16DBVR, the MAX6824WUK uniquely delivers dual push-pull reset outputs plus watchdog timer in the same 5-pin SOT23 footprint-enabling full supervision coverage without layout changes or additional components.
Availability
MAX6824WUK is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6824WUK 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 computing applications.
The MAX6821–MAX6825 family was engineered specifically for ultra-low-voltage microprocessor supervision in space-constrained, battery-operated systems requiring guaranteed reset validity down to 1.0V and integrated watchdog protection.
FAQ
What is the exact reset threshold voltage for MAX6824WUK?
The MAX6824WUK has a factory-trimmed reset threshold of 1.67V, with tolerance of ±0.05V over -40°C to +125°C. This value is confirmed in the Threshold Suffix Guide where "W" corresponds to 1.67V, and is validated in the Electrical Characteristics table under VTH for MAX682_W. The MAX6824WUK uses this precise threshold to supervise 1.6V–1.7V power rails in ultra-low-voltage systems.
Does MAX6824WUK include a manual reset input (MR)?
No, the MAX6824WUK does not include a manual reset input. Per the Selector Guide and Pin Description table, MAX6824 supports WDI and dual RESET outputs but omits MR. This distinguishes it from MAX6821/MAX6822/MAX6823/MAX6825. The MAX6824WUK relies solely on VCC monitoring and watchdog-triggered reset, making it ideal for fully autonomous supervision where operator-initiated reset is unnecessary.
What are the timing characteristics of the watchdog function in MAX6824WUK?
The MAX6824WUK watchdog timeout period is 1.6s nominal, with min/max values of 0.80s and 2.60s across -40°C to +125°C. The timer clears on any WDI edge (rising or falling), and the WDI input accepts pulses as short as 50ns. During reset assertion, the timer remains cleared and does not count. The MAX6824WUK watchdog is disabled if WDI is left unconnected or driven by a three-stated buffer.
How do the dual RESET outputs on MAX6824WUK behave during a reset event?
During any reset condition (VCC < 1.67V, WDI timeout, or MR assertion - though MR is absent in MAX6824WUK), both RESET (pin 1) and RESET (pin 4) change state simultaneously: RESET goes low and RESET goes high. They remain asserted for the full 140ms minimum reset timeout period after VCC exceeds 1.67V or WDI is toggled. This synchronized dual-output behavior is intrinsic to the MAX6824WUK silicon design and requires no external coordination.
Is MAX6824WUK compatible with 1.0V supply rails?
The MAX6824WUK does not operate from a 1.0V supply - its specified operating range is +1.53V to +2.0V per the Electrical Characteristics table. However, its reset outputs remain electrically valid and correctly asserted down to VCC = +1.0V, meaning it continues to supervise and signal fault conditions even as the supply collapses below its operational floor. This guarantees fail-safe behavior in deep brownout scenarios where other supervisors may lose output control.
MAX6824WUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.67V
- 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
MAX6824WUK FAQ
1.How can I place an order for MAX6824WUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6824WUK 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 MAX6824WUK reliable?
The price and inventory of MAX6824WUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6824WUK is usually 5 days.
3.What payment methods are accepted for MAX6824WUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6824WUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6824WUK?
MAX6824WUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6824WUK 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 MAX6824WUK?
For technical support, including MAX6824WUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6824WUK requirements.
6.How does Aetrix verify that MAX6824WUK is sourced from the original manufacturer or authorized distributors?
All MAX6824WUK 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 MAX6824WUK meets industry standards.
7.What is the process for return or replacement of MAX6824WUK?
All MAX6824WUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX6824WUK, 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 MAX6824WUK part is unused and in its original packaging.
Return procedure for MAX6824WUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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