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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:
- POWER MANAGEMENT CIRCUIT, BICMOS
- Quantity:
- Payment:
- Shipping:
Inventory:575
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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 reset 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, ensuring reliable µP initialization in battery-powered embedded systems.
For engineers reviewing the MAX6824WUK+ datasheet, MAX6824WUK+ pinout, MAX6824WUK+ application, or MAX6824WUK+ equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.0V, immunity to short negative VCC transients, no external components required, and precise 1.67V threshold for 1.8V supply monitoring.
Technical Context
The MAX6824WUK+ implements a dual-output supervisory architecture with independent active-low and active-high push-pull reset signals, enabling direct interface to µPs requiring either polarity. Its internal watchdog timer clears on any WDI edge and triggers reset if un-toggled for ≥1.6s (min 0.8s, max 2.6s over temperature).
Voltage monitoring uses a precision bandgap reference with 60ppm/°C temperature coefficient and 2×VTH hysteresis. Reset assertion occurs when VCC falls below 1.67V (±50mV over -40°C to +125°C), with 140ms minimum timeout after VCC recovery - all guaranteed down to VCC = +1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.67V ±50mV; precisely monitors 1.8V supplies during brownout |
| Reset Timeout Period | 140ms min; ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s nominal (0.8s–2.6s over temp); detects firmware hangs in real-time systems |
| Supply Voltage Range | +1.53V to +2.0V; supports ultra-low-voltage operation without external biasing |
| Reset Output Type | Dual push-pull: RESET (active-low) and RESET (active-high); eliminates need for external inverters or pull-ups |
| Operating Temperature | -40°C to +125°C; qualified for automotive under-hood and industrial control environments |
| Supply Current | ≤30µA at +1.8V; enables multi-year battery life in portable instrumentation |
Pinout & Package
Package: 5-pin SOT23-5 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output asserted low during fault; drives µP reset pin directly without pull-up |
| 2 | GND | Ground reference for all internal circuits and reset timing accuracy |
| 3 | WDI | Watchdog input; edge-sensitive (50ns min pulse); toggling resets internal 1.6s timer |
| 4 | RESET (active-high) | Push-pull output asserted high during fault; interfaces with logic requiring active-high reset |
| 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 level-shifting or inversion circuitry for mixed-signaling µP platforms |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset behavior even during deep brownout or battery depletion |
| No external components required | Reduces BOM count and PCB area; simplifies layout and qualification for safety-critical designs |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset-critical for noisy automotive power rails |
| Internal 50kΩ MR pullup (not applicable) | Not present on MAX6824WUK+; distinguishes it from MR-equipped variants like MAX6821/MAX6825 |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters operating from single-cell Li-ion (2.7–4.2V) with tight low-voltage margin. IC Role / Device Role / Timing Role: Supervises 1.8V core rail and triggers hardware reset if voltage sags below 1.67V or firmware locks up. Use Value: Prevents corrupted sensor readings or unsafe state transitions during battery depletion, meeting IEC 62304 Class B requirements. | Use Scenario: DIN-rail mounted programmable logic controller modules exposed to 24VDC field wiring noise and wide ambient temperature swings. IC Role / Device Role / Timing Role: Monitors isolated 1.8V FPGA configuration rail and asserts dual-reset signals to both FPGA and ARM Cortex-M7 host processor. Use Value: Dual push-pull outputs enable simultaneous, polarity-matched reset of heterogeneous processors without glue logic-reducing failure modes in SIL2-certified systems. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Under-hood BCMs powered by 12V battery with cold-crank transients and load-dump surges. IC Role / Device Role / Timing Role: Supervises 1.8V microcontroller supply and watches firmware execution via WDI connected to GPIO toggle loop. Use Value: 125°C rating and VCC glitch immunity prevent false resets during engine start, while 1.6s watchdog enforces fail-safe recovery from CAN bus lockups. | Use Scenario: ANSI C12.20-certified electricity meters with tamper detection, operating from supercapacitor backup during AC loss. IC Role / Device Role / Timing Role: Monitors 1.8V RTC and secure element supply; asserts RESET/RESET to halt metering and initiate secure shutdown sequence. Use Value: Guaranteed reset down to VCC = +1.0V ensures cryptographic keys remain protected and billing data integrity preserved until final capacitor discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6821WUK+ | Includes manual reset input (MR) and open-drain RESET; lacks active-high RESET output | Required where operator-initiated reset or bidirectional µP reset pins (e.g., Motorola 68HC11) are used | Select MAX6821WUK+ only if MR functionality and open-drain drive are mandatory; not pin-compatible due to different pin 1 function |
| TPS3808G16DBVR | Single active-low push-pull reset; 1.6V threshold; 200ms timeout; no active-high output or watchdog | Suitable for simpler systems needing only basic voltage supervision without dual-reset or watchdog features | Choose TPS3808G16DBVR when watchdog and dual-reset are unnecessary-reduces cost but sacrifices fault coverage |
Compared with MAX6824WUK+, MAX6821WUK+ adds manual reset capability at the expense of losing the active-high RESET output, while TPS3808G16DBVR offers lower system complexity but omits watchdog monitoring and dual-polarity reset-making MAX6824WUK+ uniquely suited for robust, self-healing embedded controllers requiring comprehensive supervision.
Availability
MAX6824WUK+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters 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 and mixed-signal ICs for industrial, automotive, communications, and computing applications.
The MAX6821–MAX6825 family delivers ultra-low-voltage microprocessor supervision with integrated watchdog and dual-reset outputs, targeting space-constrained, battery-operated, and safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage for MAX6824WUK+ and how tightly is it specified?
The MAX6824WUK+ has a factory-trimmed reset threshold of 1.67V, with tolerance of ±50mV over the full -40°C to +125°C temperature range. This specification ensures reliable supervision of 1.8V supply rails during brownout conditions, and is validated per Maxim's production test flow-not derived from typical curves or design estimates. The 1.67V value corresponds to the 'W' suffix in the Threshold Suffix Guide.
Does MAX6824WUK+ include a manual reset input (MR) pin?
No, the MAX6824WUK+ does not include a manual reset input. Per the Selector Guide and Pin Description table, MR is absent on MAX6824 - pin 3 is dedicated to WDI only. This distinguishes MAX6824WUK+ from MAX6821WUK+, MAX6822WUK+, MAX6823WUK+, and MAX6825WUK+, which all feature MR. The absence of MR simplifies routing in designs where operator-initiated reset is unnecessary.
How does the watchdog timer in MAX6824WUK+ behave when the WDI pin is left unconnected?
When WDI is left unconnected on MAX6824WUK+, the internal watchdog timer is automatically disabled. The datasheet states that disconnecting WDI or three-stating its driver clears the timer every 1.4s via an internal low-high-low pulse, preventing unintended timeouts. Therefore, MAX6824WUK+ operates solely as a voltage supervisor unless WDI is actively toggled by firmware - no external pull-up/down is needed to disable the watchdog.
Can MAX6824WUK+ operate reliably at VCC = +1.2V, and what happens to reset functionality at that voltage?
Yes, MAX6824WUK+ is fully functional down to VCC = +1.0V, and therefore operates reliably at +1.2V. Its reset outputs (both RESET and RESET) remain valid and correctly asserted/deasserted per specification at this voltage. The electrical characteristics table explicitly guarantees reset validity to VCC = +1.0V, and the absolute maximum ratings confirm operational range starts at +1.2V (min) for the W/V threshold variants. This enables use in ultra-low-power wake-up circuits and energy-harvesting systems.
What is the propagation delay from VCC falling below threshold to RESET assertion in MAX6824WUK+?
The MAX6824WUK+ asserts RESET within 20µs after VCC falls 100mV below the threshold (tRD parameter), as measured from VCC = VTH to VCC = VTH − 100mV. This fast response prevents µP execution from entering undefined states during rapid supply collapse. The same 20µs delay applies to RESET assertion, and the value is guaranteed over temperature and process variation - not a typical-only figure.
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:
- 100ms 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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