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Analog Devices Inc./Maxim Integrated MAX6824WUK+T
- Part No.:
- MAX6824WUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6824WUK+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,065
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Product details
Overview
MAX6824WUK+T from Maxim Integrated is a low-voltage microprocessor supervisory circuit 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 power-up, brownout, or software hang, with guaranteed reset validity down to VCC = +1.0V, used in embedded controllers and portable equipment requiring reliable µP supervision.
For engineers reviewing the MAX6824WUK+T datasheet, MAX6824WUK+T pinout, MAX6824WUK+T application, or MAX6824WUK+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing behavior, true watchdog interaction logic, and validated alternative options for critical µP monitoring designs.
Technical Context
The MAX6824WUK+T implements a dual-output supervisory architecture: one active-low push-pull RESET and one active-high push-pull RESET, both asserted simultaneously during VCC drop below 1.67V, MR assertion, or watchdog timeout. Its internal watchdog timer clears on any WDI edge and times out after 1.6s if no transition occurs.
Reset assertion persists for ≥140ms after VCC recovers above threshold, with propagation delay <20µs and guaranteed operation across –40°C to +125°C. The device draws ≤25µA at +3.6V over full temperature range and supports VCC as low as +1.53V for the W-suffix variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.67V ±30mV (W-suffix); enables reliable supervision of 1.8V-core systems during brownout |
| Reset Timeout Period | ≥140ms min; ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s nominal (–40°C to +85°C); provides sufficient margin for firmware execution loops |
| VCC Operating Range | +1.53V to +2.0V (W-suffix); matches low-voltage SoC supply rails without external regulation |
| Reset Output Type | Dual push-pull: RESET (active-low) and RESET (active-high); eliminates need for external pull-ups or inverters |
| Supply Current | ≤25µA at +3.6V, –40°C to +125°C; enables use in battery-powered instrumentation |
| Reset Validity Limit | VCC ≥ +1.0V; guarantees correct reset state even during deep undervoltage conditions |
Pinout & Package
MAX6824WUK+T is housed in a RoHS-compliant 5-pin SOT23-5 package (outline 21-0057, land pattern 91-0174), measuring 2.9mm × 1.6mm × 1.1mm, suitable for space-constrained embedded PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output driven low during fault; sinks up to 3.2mA at VCC ≥ 4.25V; no external pull-up required |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers; must be low-impedance |
| 3 | RESET (active-high) | Push-pull output driven high during fault; sources up to 800µA at VCC ≥ 4.75V; complements RESET for bidirectional reset logic |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); internal timer clears on transition; left unconnected to disable watchdog |
| 5 | VCC | Power supply and monitored rail; powers internal circuitry and sets reset threshold reference; operates down to +1.53V |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Simultaneous active-low and active-high reset signals eliminate external level-shifting or inversion for mixed-logic systems |
| 1.6s watchdog timeout | Configurable via WDI toggling; prevents silent firmware lockup without requiring dedicated timer peripherals |
| No external components required | Internal 50kΩ MR pull-up (not applicable to MAX6824), fixed threshold, and self-contained timing reduce BOM count and layout area |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset behavior during deep brownout-critical for data integrity in portable/battery-powered equipment |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset-avoids false triggers in noisy industrial environments |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
Use Scenario: Power sequencing and firmware crash recovery in consumer STB platforms with multi-rail supplies. IC Role / Device Role / Timing Role: Supervises 1.8V core voltage; asserts dual reset signals to SoC and peripheral ASICs upon undervoltage or watchdog timeout. Use Value: Prevents corrupted channel tuning or HDMI handshake failures by enforcing clean restart after brownout or software hang. |
Use Scenario: Industrial PLC modules requiring fail-safe startup and runtime monitoring under wide ambient temperature swings. IC Role / Device Role / Timing Role: Monitors 1.8V FPGA configuration rail; uses WDI to verify bootloader execution; maintains reset until stable clock and memory initialization complete. Use Value: Eliminates field returns due to cold-start lockup by guaranteeing reset assertion down to VCC = +1.0V at –40°C. |
| Intelligent Instruments | Portable/Battery-Powered Equipment |
Use Scenario: Handheld multimeters and data loggers with precision ADCs and flash memory. IC Role / Device Role / Timing Role: Supervises 1.8V analog front-end supply; leverages dual RESET/RESET to coordinate analog domain power-up with digital controller reset timing. Use Value: Ensures ADC calibration registers are reloaded before measurement cycles begin-prevents offset drift errors. |
Use Scenario: Wearable health monitors operating from single-cell Li-ion batteries with dynamic voltage sag. IC Role / Device Role / Timing Role: Tracks battery voltage decay into 1.67V threshold zone; asserts reset before SRAM corruption occurs during discharge cutoff. Use Value: Preserves last-measured vital signs in nonvolatile memory by triggering controlled shutdown prior to VCC collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6823WUK+T | Includes manual reset input (MR); lacks second push-pull RESET output; same 1.67V threshold and 1.6s watchdog | Required where operator-initiated reset is needed (e.g., field service mode); not suitable when dual active reset polarity is mandatory | Select MAX6823WUK+T only if MR functionality is essential and dual-reset signaling is unnecessary. |
| TPS3808G16DBVR | Single open-drain RESET output; 1.6V threshold; 200ms reset timeout; no watchdog or dual-reset capability | Suitable for basic power-on reset only; cannot replace MAX6824WUK+T in watchdog-monitored or bidirectional reset systems | Choose TPS3808G16DBVR only for cost-sensitive, non-watchdog applications where active-high reset is generated externally. |
Compared with MAX6824WUK+T, MAX6823WUK+T adds manual reset but removes the active-high RESET output, while TPS3808G16DBVR omits both watchdog and dual-reset functionality-making MAX6824WUK+T uniquely suited for systems requiring coordinated active-low/active-high reset assertion and autonomous firmware supervision.
Availability
MAX6824WUK+T is available at Aetrix Electronics and suitable for embedded controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6824WUK+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 industrial, computing, and communications applications.
The MAX6821–MAX6825 family was engineered specifically for low-voltage microprocessor supervision in space-constrained, battery-aware systems-emphasizing ultra-low quiescent current, guaranteed sub-2V operation, and integrated watchdog reliability.
FAQ
What is the exact reset threshold voltage for MAX6824WUK+T?
The MAX6824WUK+T has a factory-programmed reset threshold of 1.67V, with tolerance of ±30mV over –40°C to +125°C. This value is laser-trimmed and specified in the Electrical Characteristics table under "MAX682_W" row. The threshold applies to VCC falling; hysteresis is 2×VTH (≈3.34mV), ensuring noise immunity during recovery.
Does MAX6824WUK+T include a manual reset input (MR)?
No, MAX6824WUK+T does not include a manual reset input. Per the Selector Guide and Pin Description, MR is present on MAX6821/MAX6822/MAX6823/MAX6825 but omitted from MAX6824. Pin 3 on MAX6824WUK+T is assigned to RESET (active-high), not MR-confirmed by the SOT23-5 top-view diagram and functional description.
How does the watchdog timer in MAX6824WUK+T interact with the reset outputs?
In MAX6824WUK+T, a watchdog timeout triggers simultaneous assertion of both RESET (low) and RESET (high) for the full reset timeout period (≥140ms). The internal 1.6s watchdog timer clears on any WDI edge and remains inactive while reset is asserted. WDI is unused by default and must be actively driven to enable watchdog functionality.
What is the minimum VCC required for MAX6824WUK+T to guarantee correct reset output states?
MAX6824WUK+T guarantees correct RESET and RESET output logic states down to VCC = +1.0V, as explicitly stated in the General Description and Electrical Characteristics. This specification holds across the full –40°C to +125°C temperature range and enables robust operation during deep brownout conditions common in battery-powered systems.
Can MAX6824WUK+T be used in place of MAX6821WUK+T or MAX6822WUK+T?
No-MAX6824WUK+T is not a drop-in replacement for MAX6821WUK+T or MAX6822WUK+T. While all share the same package and 1.67V threshold, MAX6824WUK+T lacks MR input (present on both MAX6821/MAX6822) and provides dual push-pull outputs instead of push-pull + open-drain (MAX6822) or push-pull only (MAX6821). Pin 3 function differs, requiring PCB redesign.
MAX6824WUK+T 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+T FAQ
1.How can I place an order for MAX6824WUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6824WUK+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 MAX6824WUK+T reliable?
The price and inventory of MAX6824WUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6824WUK+T is usually 5 days.
3.What payment methods are accepted for MAX6824WUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6824WUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6824WUK+T?
MAX6824WUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6824WUK+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 MAX6824WUK+T?
For technical support, including MAX6824WUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6824WUK+T requirements.
6.How does Aetrix verify that MAX6824WUK+T is sourced from the original manufacturer or authorized distributors?
All MAX6824WUK+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 MAX6824WUK+T meets industry standards.
7.What is the process for return or replacement of MAX6824WUK+T?
All MAX6824WUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6824WUK+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 MAX6824WUK+T part is unused and in its original packaging.
Return procedure for MAX6824WUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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