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Analog Devices Inc./Maxim Integrated MAX6822SUK-T
- Part No.:
- MAX6822SUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822SUK-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,338
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Product details
Overview
MAX6822SUK-T from Maxim Integrated is a low-voltage microprocessor supervisory IC in SOT23-5 package, providing open-drain active-low RESET output, 3.08V reset threshold (suffix 'T'), 140ms minimum reset timeout, and 1.6s watchdog timeout. It monitors VCC for brownout detection, accepts manual reset via MR pin, and operates down to VCC = +1.0V - used in embedded controllers and portable battery-powered equipment.
For engineers reviewing the MAX6822SUK-T datasheet, MAX6822SUK-T pinout, MAX6822SUK-T application, or MAX6822SUK-T equivalent, this page delivers verified functional role, exact reset threshold, watchdog timing, MR debounce behavior, and open-drain interface compatibility with bidirectional µP reset pins - all confirmed for the MAX6822SUK-T variant.
Technical Context
The MAX6822SUK-T implements a voltage-monitoring comparator with hysteresis (2×VTH), a monostable reset timeout circuit (140–320ms), and an independent watchdog timer (1.12–2.60s) that clears on WDI edge transitions. Its open-drain RESET output requires external pull-up and supports bidirectional µP reset I/O like Motorola 68HC11.
It features internal 50kΩ MR pull-up, glitch rejection (100ns), and immunity to negative VCC transients ≤20µs at 100mV overdrive. Reset assertion is guaranteed valid down to VCC = +1.0V, 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 | 3.08V ±30mV (VCC falling); ensures reliable brownout detection for 3.3V systems with margin |
| Reset Timeout Period | 140ms min (100–320ms over full temp range); holds µP in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s nominal (0.8–2.6s over -40°C to +125°C); provides robust software execution monitoring |
| RESET Output Type | Open-drain active-low; enables wired-OR reset bus and bidirectional µP reset pin interfacing |
| MR Input Behavior | Active-low with 50kΩ internal pull-up; debounced internally - no external RC needed |
| VCC Operating Range | +1.2V to +5.5V (-40°C to +125°C); supports operation during deep brownout down to 1.0V (reset valid) |
| Supply Current | 7µA typ at +3.6V, -40°C to +85°C; enables ultra-low-power use in battery-backed systems |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline, land pattern 21-0057), 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 |
| 2 | GND | Ground reference for all internal circuits and reset comparator |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (50kΩ); asserts reset when pulled low |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets 1.6s timer on transition; disabled if left floating |
| 5 | VCC | Supply and monitored voltage input; reset triggers when VCC falls below 3.08V threshold |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates voltage monitor, watchdog timer, manual reset logic, and reset delay in single SOT23-5 IC |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion even during severe brownout conditions before power collapse |
| Immunity to short negative VCC transients | Rejects glitches ≤20µs wide at 100mV overdrive - avoids spurious resets in noisy power environments |
| Debounced manual reset input | Internal MR filtering eliminates need for external RC network; supports direct switch-to-GND connection |
| Open-drain RESET for bidirectional µP interfaces | Enables shared reset bus and compatibility with µPs like 68HC11 that drive reset pins both ways |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
|
Use Scenario: Power sequencing and firmware crash recovery in consumer STB platforms with 3.3V core rails. IC Role / Device Role / Timing Role: Voltage supervisor asserting open-drain RESET to hold ARM-based SoC in known state during brownout or cold boot. Use Value: Prevents corrupted firmware execution by guaranteeing 140ms minimum reset hold time after VCC recovers above 3.08V. |
Use Scenario: Reliable restart capability in industrial PLC modules operating across -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Dual-function supervisor monitoring 3.3V supply while enabling operator-initiated reset via front-panel pushbutton on MR pin. Use Value: Internal 50kΩ MR pull-up and 100ns glitch rejection eliminate external components and false triggers in electrically noisy cabinets. |
| Portable/Battery-Powered Equipment | Critical µP Monitoring |
|
Use Scenario: Long-life battery operation in handheld test instruments with intermittent wake/sleep cycles. IC Role / Device Role / Timing Role: Low-quiescent-current (7µA typ) supervisor ensuring µP remains held in reset until battery voltage stabilizes above 3.08V. Use Value: Valid reset assertion down to VCC = +1.0V prevents erratic behavior during final battery discharge phase. |
Use Scenario: Fail-safe monitoring of medical device microcontrollers where uncontrolled reboot is hazardous. IC Role / Device Role / Timing Role: Watchdog-enforced software liveness check (1.6s timeout) combined with voltage brownout protection. Use Value: Independent WDI edge detection and MR-triggered reset provide two orthogonal fault-recovery paths per IEC 62304 requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6822SUT-T | Same functionality and pinout; differs only in packaging - lead-free (RoHS) version with '+T' suffix replaced by '-T' in ordering code | Identical electrical behavior; selected when lead-free compliance is mandated by end-equipment regulatory requirements | Drop-in replacement for MAX6822SUK-T in new designs requiring Pb-free assembly; same thermal and electrical performance |
| TPS3808G33DBVR | 3.3V fixed threshold, push-pull RESET, 200ms reset timeout, no manual reset input; TI BiCMOS process | Lacks MR and WDI pins; suited for simpler reset-only applications without watchdog or operator reset needs | Select when only voltage monitoring and fixed 3.3V threshold are required - not suitable for designs needing manual reset or watchdog supervision |
Compared with MAX6822SUK-T, MAX6822SUT-T offers identical supervision functionality with RoHS-compliant packaging, while TPS3808G33DBVR provides a lower-cost reset-only alternative but omits manual reset and watchdog capabilities essential for critical embedded recovery.
Availability
MAX6822SUK-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 guaranteed reset behavior across industrial temperature ranges.
Supply support for MAX6822SUK-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 high-reliability ICs for industrial, computing, and communications markets.
The MAX682x family was developed specifically for low-voltage microprocessor supervision in space-constrained, battery-sensitive, and thermally demanding embedded systems - delivering integrated voltage monitoring, watchdog, and manual reset in 5-pin SOT23.
FAQ
What is the exact reset threshold voltage of the MAX6822SUK-T?
The MAX6822SUK-T has a factory-trimmed reset threshold of 3.08V (±30mV) for VCC falling, corresponding to the 'T' suffix in its part number. This value is guaranteed over the full operating temperature range (-40°C to +125°C) and ensures reliable brownout detection for 3.3V supply rails with appropriate margin. The MAX6822SUK-T datasheet specifies minimum/maximum thresholds of 2.97V and 3.17V respectively at -40°C to +125°C.
Does the MAX6822SUK-T include a watchdog timer, and what is its timeout period?
Yes, the MAX6822SUK-T includes a watchdog timer with a nominal timeout period of 1.6 seconds. Over temperature, this ranges from 0.8s to 2.6s (-40°C to +125°C). The timer resets on any rising or falling edge at the WDI pin and remains cleared while RESET is asserted. The MAX6822SUK-T watchdog is fully functional and matches the specifications documented for the MAX6822 series in the official Maxim datasheet.
What type of RESET output does the MAX6822SUK-T provide, and how is it used?
The MAX6822SUK-T provides an open-drain, active-low RESET output (pin 1). It requires an external pull-up resistor to VCC or another logic rail and is designed to interface directly with bidirectional µP reset pins (e.g., Motorola 68HC11). This configuration allows multiple devices to share a common reset bus. The MAX6822SUK-T RESET sinks ≥50µA when asserted and remains valid down to VCC = +1.0V.
Is manual reset supported on the MAX6822SUK-T, and how is it implemented?
Yes, the MAX6822SUK-T supports manual reset via the MR pin (pin 3), which is active-low and features an internal 50kΩ pull-up resistor to VCC. Pulling MR low asserts RESET for the full reset timeout period (≥140ms), and the pin includes 100ns glitch rejection. No external components are needed - a simple momentary switch from MR to GND suffices. This MR functionality is confirmed for the MAX6822SUK-T in the MAX6821–MAX6825 family datasheet.
What is the operating temperature range and package type of the MAX6822SUK-T?
MAX6822SUK-T is rated for operation from -40°C to +125°C and is supplied in a 5-pin SOT23-5 package (outline U5-1, land pattern 21-0057). This compact, surface-mount package supports high-density PCB layouts and meets industrial-grade thermal requirements. The 'UK' in MAX6822SUK-T explicitly denotes the SOT23-5 package variant, and the '-T' suffix indicates tape-and-reel packaging.
MAX6822SUK-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:
- 2.93V
- 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
MAX6822SUK-T FAQ
1.How can I place an order for MAX6822SUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822SUK-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 MAX6822SUK-T reliable?
The price and inventory of MAX6822SUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822SUK-T is usually 5 days.
3.What payment methods are accepted for MAX6822SUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822SUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822SUK-T?
MAX6822SUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822SUK-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 MAX6822SUK-T?
For technical support, including MAX6822SUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822SUK-T requirements.
6.How does Aetrix verify that MAX6822SUK-T is sourced from the original manufacturer or authorized distributors?
All MAX6822SUK-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 MAX6822SUK-T meets industry standards.
7.What is the process for return or replacement of MAX6822SUK-T?
All MAX6822SUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822SUK-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 MAX6822SUK-T part is unused and in its original packaging.
Return procedure for MAX6822SUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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