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Analog Devices Inc./Maxim Integrated MAX6822WUK
- Part No.:
- MAX6822WUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822WUK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,725
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Product details
Overview
MAX6822WUK from Maxim Integrated is a low-voltage microprocessor supervisory IC in SOT23-5 package, featuring open-drain active-low RESET output, 1.67V reset threshold (W suffix), 140ms minimum reset timeout, and 1.6s watchdog timeout. It monitors VCC supply integrity, asserts reset during brownout or power-up, and supports manual reset and watchdog supervision for embedded controllers and portable equipment.
For engineers reviewing the MAX6822WUK datasheet, MAX6822WUK pinout, MAX6822WUK application, or MAX6822WUK equivalent, this page delivers verified functional identity, exact reset threshold and timing parameters, confirmed SOT23-5 pin mapping, and validated alternative options for µP supervision in battery-powered and automotive-grade systems.
Technical Context
The MAX6822WUK implements a precision voltage monitor with ±1.5% threshold accuracy over -40°C to +125°C, guaranteed valid reset assertion down to VCC = +1.0V. Its internal watchdog timer detects µP code stalls by monitoring WDI edge transitions within a 1.6s window, clearing on any rising or falling edge.
Reset generation uses an internal timeout counter that holds RESET asserted for ≥140ms after VCC rises above 1.67V, MR returns high, or watchdog triggers. The open-drain RESET output interfaces directly with bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pullup resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.67V ±1.5% - precisely triggers reset when VCC falls below nominal supply for 1.8V 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 - fully specified operation across full temperature range for ultra-low-voltage designs |
| RESET Output Type | Open-drain active-low - enables wired-OR reset bus and direct interface with bidirectional µP reset I/O |
| Manual Reset Input | Active-low with 50kΩ internal pullup - eliminates external components for pushbutton reset implementation |
| Supply Current | 16µA (max at +125°C) - enables use in always-on battery-backed monitoring circuits |
Pinout & Package
MAX6822WUK is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, lead-free compatible, rated for -40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output - requires external pullup; sinks 50µA at 0.4V for reliable logic-low assertion |
| 2 | GND | Ground reference - common return path for all internal circuitry and reset timing functions |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (50kΩ); 1µs minimum pulse width required |
| 4 | WDI | Watchdog input - toggling edge clears 1.6s timer; unconnected or three-stated disables watchdog |
| 5 | VCC | Supply voltage and monitored rail - powers device and serves as input to voltage threshold comparator |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset behavior even during deep brownout conditions before full power collapse |
| No external components required | Integrates pullup on MR, threshold reference, watchdog oscillator, and reset timer - reduces BOM count and PCB area |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV undershoot without spurious reset - avoids false triggers from switching noise |
| 140ms min reset timeout with temperature stability | Timeout varies <±10% over full -40°C to +125°C range - eliminates need for external RC timing |
| Open-drain RESET with 1.0µA max leakage | Enables multi-source reset arbitration and compatibility with 1.8V/2.5V/3.3V µP I/O voltage domains |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Wearable ECG sensor operating from single Li-ion cell with dynamic voltage sag during RF transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting open-drain RESET to hold MCU in reset until VCC recovers above 1.67V after transient dip. Use Value: Prevents corrupted ADC sampling or BLE packet loss during brief brownout events without requiring external reset IC or RC network. |
Use Scenario: Door module MCU subjected to load dump and cold-crank voltage transients in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Monitors regulated 1.8V domain; asserts RESET on undervoltage and responds to watchdog timeout if firmware hangs during CAN message processing. Use Value: Guarantees safe state recovery after power disturbance, meeting ISO 16750-2 pulse 4a/b immunity requirements without layout-sensitive discrete solutions. |
| Industrial PLC I/O Submodules | Smart Energy Meters |
Use Scenario: DIN-rail mounted I/O expander with isolated 3.3V logic rail powered from wide-input DC-DC converter. IC Role / Device Role / Timing Role: Supervises 3.3V rail using 1.67V threshold variant to detect early-stage converter failure before downstream logic corruption. Use Value: Enables graceful shutdown of analog front-end and EEPROM write protection before VCC drops below µP operational minimum. |
Use Scenario: Revenue-grade meter with tamper detection, real-time clock, and metrology ASIC powered from supercap backup. IC Role / Device Role / Timing Role: Provides low-current (16µA max) supervision of 1.8V RTC domain during main power loss, triggering controlled save-to-flash sequence. Use Value: Extends backup runtime by minimizing quiescent current while maintaining guaranteed reset assertion down to 1.0V for data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6822TUK | 3.08V reset threshold; same SOT23-5 package, pinout, and timing specs | Designed for 3.3V systems instead of 1.8V/ultra-low-voltage rails | Select when supervising 3.3V logic supplies - identical functionality except threshold voltage |
| TPS3808G16DBVR | 1.6V threshold (±0.5%), 200ms reset timeout, push-pull RESET, 1.5µA IQ | Lacks watchdog timer and manual reset input; optimized for ultra-low-power static supervision | Choose when watchdog and MR are unnecessary and sub-µA quiescent current is critical |
Compared with MAX6822WUK, MAX6822TUK offers identical supervision architecture but targets higher-voltage rails, while TPS3808G16DBVR trades watchdog/manual reset capability for lower IQ and tighter threshold tolerance - making it suitable only for static voltage monitoring without runtime fault detection.
Availability
MAX6822WUK is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O submodules, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6822WUK 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 markets, with emphasis on reliability and integration.
The MAX6821–MAX6825 family was engineered specifically for space-constrained µP supervision in ultra-low-voltage systems, combining reset, watchdog, and manual reset in a single 5-pin SOT23 package without external components.
FAQ
What is the exact reset threshold voltage for MAX6822WUK?
The MAX6822WUK has a factory-programmed reset threshold of 1.67V, with ±1.5% accuracy over the full -40°C to +125°C temperature range. This value is confirmed in the Threshold Suffix Guide and Electrical Characteristics table under VTH for MAX682_W. The MAX6822WUK is specifically intended for monitoring 1.8V supply rails where early brownout detection is critical.
Does MAX6822WUK include a watchdog timer, and what is its timeout period?
Yes, the MAX6822WUK includes a watchdog timer with a nominal timeout period of 1.6 seconds. This is explicitly stated in the Features section and verified in the Electrical Characteristics table under tWD. The timer resets on any edge (rising or falling) at the WDI pin and remains cleared while RESET is asserted - a core function shared across MAX6821/MAX6822/MAX6823/MAX6824 variants.
What type of RESET output does MAX6822WUK provide, and how is it used?
The MAX6822WUK provides an open-drain active-low RESET output (Pin 1). As documented in the Pin Description and Selector Guide, this allows direct connection to bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pullup resistor. The output sinks 50µA maximum at 0.4V when asserted, ensuring compatibility with 1.8V, 2.5V, and 3.3V logic families.
Is manual reset functionality available on MAX6822WUK, and what are its electrical characteristics?
Yes, MAX6822WUK includes an active-low manual reset input (MR, Pin 3) with an internal 50kΩ pullup resistor to VCC. The MR pin accepts CMOS-level signals, requires a minimum 1µs pulse width, and provides 100ns glitch rejection. When pulled low, it forces RESET assertion for the full 140ms timeout period after release - a feature confirmed in the Selector Guide and Detailed Description sections.
What is the operating voltage range for MAX6822WUK, and why is it narrower than other variants in the family?
The MAX6822WUK operates from +1.53V to +2.0V, as specified in the Electrical Characteristics table for MAX682_W. This narrow range reflects its optimization for ultra-low-voltage 1.8V systems: the internal bandgap reference and comparator are trimmed and characterized only within this window to ensure ±1.5% threshold accuracy and guaranteed reset validity down to +1.0V - unlike higher-threshold variants rated for 2.7V–5.5V operation.
MAX6822WUK 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:
- Open Drain or Open Collector
- Reset:
- 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
MAX6822WUK FAQ
1.How can I place an order for MAX6822WUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822WUK 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 MAX6822WUK reliable?
The price and inventory of MAX6822WUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822WUK is usually 5 days.
3.What payment methods are accepted for MAX6822WUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822WUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822WUK?
MAX6822WUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822WUK 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 MAX6822WUK?
For technical support, including MAX6822WUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822WUK requirements.
6.How does Aetrix verify that MAX6822WUK is sourced from the original manufacturer or authorized distributors?
All MAX6822WUK 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 MAX6822WUK meets industry standards.
7.What is the process for return or replacement of MAX6822WUK?
All MAX6822WUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822WUK, 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 MAX6822WUK part is unused and in its original packaging.
Return procedure for MAX6822WUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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