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Analog Devices Inc./Maxim Integrated MAX6822LUK+T
- Part No.:
- MAX6822LUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822LUK+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,486
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Product details
Overview
MAX6822LUK+T from Maxim Integrated is a low-voltage microprocessor supervisory IC in 5-pin SOT23 package, featuring open-drain active-low RESET output, 4.63V reset threshold (L suffix), 140ms minimum reset timeout, 1.6s watchdog timeout, and manual reset input. It monitors VCC supply integrity and asserts reset during power-up, brownout, or software fault conditions in embedded controllers and portable equipment.
For engineers reviewing the MAX6822LUK+T datasheet, MAX6822LUK+T pinout, MAX6822LUK+T application, or MAX6822LUK+T equivalent, this device serves as a precision voltage-monitoring and watchdog solution for systems requiring guaranteed reset assertion down to VCC = +1.0V, immunity to short negative VCC transients, and no external components.
Technical Context
The MAX6822LUK+T integrates a precision voltage comparator with 60ppm/°C temperature coefficient, a monostable reset timer with 140–320ms timeout range, and a 1.12–2.60s watchdog timer cleared by WDI edge transitions. Its open-drain RESET output supports bidirectional µP reset I/O interfaces like Motorola 68HC11 via external pull-up.
It features internal 50kΩ MR pull-up, glitch rejection on MR (100ns), and WDI pulse detection as short as 50ns. The device operates across –40°C to +125°C with supply current as low as 7µA at +3.6V and –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±0.13V (L suffix); ensures reliable reset assertion when monitored +5V rail drops below safe operating level |
| Reset Timeout Period | 140ms min (100–320ms over temp); guarantees µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s nominal (0.8–2.6s over temp); provides robust software execution monitoring without false triggers |
| RESET Output Type | Open-drain active-low; enables wired-OR reset bus and direct interface to bidirectional µP reset pins |
| VCC Operating Range | +1.2V to +5.5V (–40°C to +125°C); supports operation during deep brownout while maintaining valid reset state |
| Supply Current | 7µA typ at +3.6V (–40°C to +85°C); enables ultra-low-power use in battery-backed systems |
| MR Input Logic | Active-low with 0.3×VCC VIH/0.3×VCC VIL thresholds and 200ns MR-to-reset delay; compatible with CMOS-level control signals |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline, 21-0057 land pattern), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset output; requires external pull-up; sinks ≥50µA at VCC ≥1.0V for asserted state |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (50kΩ); debounced and glitch-filtered |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears 1.6s timer on transition; disabled if left floating |
| 5 | VCC | Supply and monitored voltage input; reset threshold referenced to this pin; valid down to +1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Reset Valid to VCC = +1.0V | Ensures fail-safe reset assertion even during severe brownout, preventing µP runaway before power collapse |
| Immunity to Short Negative VCC Transients | Withstands ≤20µs transients 100mV below threshold without spurious reset-critical for noisy industrial rails |
| No External Components Required | Reduces BOM count, PCB area, and qualification effort; eliminates resistor/capacitor tolerance and aging effects |
| 140ms Minimum Reset Timeout | Meets JEDEC JESD78 reliability requirements for minimum reset pulse width under all temperature and voltage conditions |
| Manual Reset with Internal Pull-Up | Enables momentary switch interface without external biasing; simplifies front-panel or test-point reset implementation |
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: Voltage supervisor and watchdog timer ensuring clean boot and automatic recovery after HDMI hot-plug or tuner lock failure. Use Value: Prevents frozen UI or silent boot failure by asserting reset within 140ms of VCC dip or WDI timeout, enabling unattended recovery. |
Use Scenario: Industrial PLC modules requiring deterministic restart after ESD-induced code hang. IC Role / Device Role / Timing Role: Critical µP monitor that holds reset until +5V rail stabilizes above 4.63V and maintains it for ≥140ms. Use Value: Eliminates need for external RC reset networks, reducing layout sensitivity to trace inductance and capacitor drift. |
| Portable/Battery-Powered Equipment | Intelligent Instruments |
|
Use Scenario: Handheld multimeters and data loggers powered by single-cell Li-ion with dynamic load switching. IC Role / Device Role / Timing Role: Low-quiescent-current (7µA) supervisor detecting brownout during RF transmission bursts. Use Value: Extends battery life while guaranteeing reset validity down to VCC = +1.0V-enabling operation deeper into discharge curve. |
Use Scenario: Benchtop oscilloscopes and spectrum analyzers requiring high-reliability boot and watchdog coverage. IC Role / Device Role / Timing Role: Dual-function supervisor providing both power-on reset and software-execution monitoring via WDI. Use Value: Enables field-upgradable firmware with verified watchdog integration-no risk of bricking due to corrupted update. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6822MUK+T | 4.38V reset threshold (M suffix) vs. 4.63V (L); otherwise identical pinout, timing, and features | Suitable for +5V systems with tighter tolerance rails where 4.38V threshold avoids nuisance resets during ripple | Select based on exact VCC nominal and worst-case droop margin; same footprint and layout |
| TPS3808G33DBVR | Push-pull RESET output, 3.3V fixed threshold, 200ms timeout; no manual reset input; TI BiCMOS process | Lacks MR and WDI; intended for simpler reset-only applications without watchdog or operator-initiated reset | Choose only if watchdog and manual reset are unnecessary; not functionally equivalent but viable for basic voltage monitoring |
Compared with MAX6822LUK+T, the MAX6822MUK+T offers identical functionality with lower reset threshold for marginal +5V rails, while the TPS3808G33DBVR omits critical features (MR, WDI) and uses push-pull output-requiring redesign for bidirectional reset buses.
Availability
MAX6822LUK+T is available at Aetrix Electronics and suitable for set-top boxes, embedded controllers, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6822LUK+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 and mixed-signal ICs for industrial, computing, and communications applications, with emphasis on reliability and integration.
The MAX6821–MAX6825 family delivers compact, low-power µP supervision for space-constrained embedded systems-designed specifically to replace discrete reset circuits while adding watchdog and manual reset capability in SOT23.
FAQ
What is the reset threshold voltage of the MAX6822LUK+T?
The MAX6822LUK+T has a factory-programmed reset threshold of 4.63V (L suffix), with ±0.13V tolerance over –40°C to +125°C. This value is guaranteed by design and tested across temperature and voltage extremes to ensure reliable assertion when the monitored +5V supply falls below safe operating limits. The MAX6822LUK+T maintains this accuracy with 60ppm/°C temperature coefficient.
Does the MAX6822LUK+T support manual reset functionality?
Yes, the MAX6822LUK+T includes an active-low manual reset input (MR) with internal 50kΩ pull-up to VCC. Driving MR low forces reset assertion for the full timeout period (≥140ms), and the input accepts standard CMOS logic levels. The MAX6822LUK+T requires no external debounce components-making it ideal for front-panel switches or test-mode reset signals.
What type of RESET output does the MAX6822LUK+T provide?
The MAX6822LUK+T provides an open-drain active-low RESET output, enabling wired-OR configuration and direct interface to µPs with bidirectional reset I/O (e.g., Motorola 68HC11). Unlike push-pull variants, this output requires an external pull-up resistor but allows multiple supervisors or µPs to share a common reset bus without contention.
Can the MAX6822LUK+T operate reliably at low supply voltages?
Yes, the MAX6822LUK+T guarantees valid reset assertion down to VCC = +1.0V, and its internal circuitry remains functional across VCC = +1.2V to +5.5V over –40°C to +125°C. This ensures fail-safe behavior during deep brownout events where other supervisors may release reset prematurely-critical for battery-powered systems using the MAX6822LUK+T.
Is the watchdog timer in the MAX6822LUK+T enabled by default?
No-the watchdog timer in the MAX6822LUK+T is disabled by default when the WDI pin is left unconnected or driven high-impedance. To enable it, WDI must be actively toggled (rising or falling edge) within the 1.6s timeout window. The MAX6822LUK+T's watchdog can be permanently disabled without modifying firmware, offering flexibility for development versus production configurations.
MAX6822LUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX6822LUK+T FAQ
1.How can I place an order for MAX6822LUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822LUK+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 MAX6822LUK+T reliable?
The price and inventory of MAX6822LUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822LUK+T is usually 5 days.
3.What payment methods are accepted for MAX6822LUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822LUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822LUK+T?
MAX6822LUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822LUK+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 MAX6822LUK+T?
For technical support, including MAX6822LUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822LUK+T requirements.
6.How does Aetrix verify that MAX6822LUK+T is sourced from the original manufacturer or authorized distributors?
All MAX6822LUK+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 MAX6822LUK+T meets industry standards.
7.What is the process for return or replacement of MAX6822LUK+T?
All MAX6822LUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822LUK+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 MAX6822LUK+T part is unused and in its original packaging.
Return procedure for MAX6822LUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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