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Analog Devices Inc./Maxim Integrated MAX6822MUK+T
- Part No.:
- MAX6822MUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822MUK+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6822MUK+T from Maxim Integrated is a low-voltage microprocessor supervisory IC in SOT23-5 package, featuring open-drain active-low RESET output, 4.38V reset threshold (suffix M), 140ms minimum reset timeout, 1.6s watchdog timeout, and manual reset input - used to ensure reliable power-up sequencing and fault recovery in embedded controllers and portable equipment.
For engineers reviewing the MAX6822MUK+T datasheet, MAX6822MUK+T pinout, MAX6822MUK+T application, or MAX6822MUK+T equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior, supply-voltage margining down to +1.0V, and validated alternatives for brownout monitoring and watchdog supervision in space-constrained designs.
Technical Context
The MAX6822MUK+T integrates voltage monitoring, watchdog timer, and debounced manual reset in a single BiCMOS device. Its open-drain RESET output interfaces directly with bidirectional µP reset pins (e.g., Motorola 68HC11) using an external pullup, while the internal 50kΩ MR pullup eliminates need for external components.
It asserts reset when VCC falls below 4.38V (±30mV over –40°C to +125°C), holds reset for ≥140ms after VCC recovers, and triggers watchdog reset if WDI remains static >1.6s. Reset remains valid down to VCC = +1.0V, and it rejects negative VCC transients ≤20µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±30mV (–40°C to +125°C); ensures reliable detection of 4.5V nominal supply brownout |
| Reset Timeout Period | 140ms min; guarantees µP remains held in reset long enough for stable VCC and clock startup |
| Watchdog Timeout | 1.6s nominal (0.8s–2.6s over temp); provides robust software execution monitoring without false triggers |
| Supply Voltage Range | +1.2V to +5.5V (–40°C to +125°C); supports operation during deep brownout and full rail conditions |
| RESET Output Type | Open-drain active-low; enables wired-OR reset bus and compatibility with bidirectional µP reset I/O |
| MR Input Logic | Active-low with 50kΩ internal pullup; allows direct switch-to-GND connection without external R |
| WDI Pulse Width Min | 50ns; accommodates fast µP GPIO toggling without missing watchdog refresh |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline, 21-0057 land pattern), RoHS-compliant, surface-mountable with 0.95mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; requires external pullup; sinks 50µA @ VCC ≥1.0V |
| 2 | GND | Ground reference for all internal circuitry and reset assertion logic |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (50kΩ); accepts CMOS levels |
| 4 | WDI | Watchdog input; edge-sensitive; clears 1.6s timer on rising or falling transition |
| 5 | VCC | Supply and monitored voltage input; reset asserted when VCC < 4.38V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset state even during severe brownout or battery sag |
| No external components required | Reduces BOM count and PCB area; eliminates discrete R/C for MR debounce or RESET pullup |
| Immunity to short negative VCC transients | Prevents spurious resets from noise or switching glitches ≤20µs at 100mV overdrive |
| 1.6s watchdog timeout with 50ns pulse detection | Enables precise software health monitoring without sacrificing low-power operation |
| Five-voltage threshold options via suffix coding | Supports design reuse across 1.8V–5.0V systems via drop-in part selection (e.g., M = 4.38V) |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
Use Scenario: Power sequencing and crash recovery in cable/satellite STBs with multi-rail supplies and ARM-based SoCs. IC Role / Device Role / Timing Role: Supervises 3.3V and 1.8V rails; asserts open-drain RESET to coordinate cold boot and firmware reload after watchdog timeout. Use Value: Prevents corrupted firmware execution by holding µP in reset until all supplies stabilize post-power-cycle. | Use Scenario: Industrial PLC modules requiring fail-safe restart on code lockup or undervoltage. IC Role / Device Role / Timing Role: Monitors 5.0V system rail; uses MR for field-service reset and WDI for cyclic software sanity check. Use Value: Enables unattended recovery from hung states without operator intervention or hardware reset button. |
| Portable/Battery-Powered Equipment | Critical µP Monitoring |
Use Scenario: Handheld medical instruments powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Tracks VCC against 4.38V threshold; leverages low ICC (≤25µA at +125°C) to extend battery life. Use Value: Delivers reliable brownout protection while consuming <30µA typical, minimizing quiescent drain. | Use Scenario: Data acquisition systems where µP must never execute invalid instructions due to supply dip. IC Role / Device Role / Timing Role: Provides dual-layer protection: voltage monitor + watchdog, both asserting same open-drain RESET line. Use Value: Eliminates need for separate reset IC and watchdog IC, reducing failure points and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6821MUK+T | Push-pull RESET output instead of open-drain; identical threshold, timeout, and MR/WDI specs | Requires no external pullup; unsuitable for wired-OR reset buses or bidirectional µP reset pins | Select when driving a dedicated µP reset input without shared reset lines |
| TPS3808G33DBVR | 3.3V fixed threshold, push-pull RESET, no manual reset input, 200ms timeout, TI BiCMOS process | Lacks MR and WDI functions; designed for simpler voltage-monitor-only use cases | Select when only power-on reset and brownout detection are needed, not watchdog or manual reset |
Compared with MAX6822MUK+T, MAX6821MUK+T offers identical supervision functionality but replaces open-drain flexibility with push-pull drive strength, while TPS3808G33DBVR reduces feature set to basic voltage monitoring - making MAX6822MUK+T the optimal choice when bidirectional reset interface, manual reset, and watchdog coexistence are required.
Availability
MAX6822MUK+T is available at Aetrix Electronics and suitable for embedded controllers, portable/battery-powered equipment, and critical µP monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6822MUK+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 targets space-constrained embedded systems needing integrated voltage monitoring, watchdog, and manual reset - delivering single-chip reliability for µP-based products from consumer electronics to industrial controls.
FAQ
What is the reset threshold voltage of the MAX6822MUK+T?
The MAX6822MUK+T has a factory-programmed reset threshold of 4.38V, with tolerance of ±30mV over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Threshold Suffix Guide and Electrical Characteristics table, and applies specifically to the "M" suffix variant. The MAX6822MUK+T asserts reset when VCC falls below this threshold and maintains reset for ≥140ms after VCC rises above it.
Does the MAX6822MUK+T support manual reset functionality?
Yes, the MAX6822MUK+T includes a dedicated active-low manual reset input (MR) with internal 50kΩ pullup to VCC. Pulling MR low forces reset assertion for the full timeout period (≥140ms) after MR returns high. This function is explicitly documented in the Selector Guide and Pin Description sections, and is shared with MAX6821/MAX6823/MAX6825 - confirming MR is fully operational in MAX6822MUK+T.
What type of RESET output does the MAX6822MUK+T provide?
The MAX6822MUK+T provides an open-drain active-low RESET output, distinct from the push-pull variants (MAX6821/MAX6823). This configuration enables wired-OR reset busing and direct interfacing with µPs having bidirectional reset I/O (e.g., Motorola 68HC11), as confirmed in the Applications Information and Pin Configurations sections of the datasheet.
Can the MAX6822MUK+T operate down to 1.0V supply voltage?
Yes, the MAX6822MUK+T guarantees correct RESET output state down to VCC = +1.0V, as stated in the General Description and Electrical Characteristics. This ensures deterministic reset behavior during deep brownout or battery-depleted conditions - a key differentiator versus many supervisory ICs that lose reset validity below 1.2V or 1.5V.
Is the watchdog timer in the MAX6822MUK+T enabled by default?
Yes, the watchdog timer in the MAX6822MUK+T is active by default and requires periodic toggling of the WDI pin to prevent timeout. The timer is cleared on any WDI edge (rising or falling) and triggers reset if WDI remains static for >1.6s. Watchdog disable is achieved only by leaving WDI unconnected or three-stating its driver - a behavior explicitly defined in the Detailed Description and Applications Information.
MAX6822MUK+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:
- 4.38V
- 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
MAX6822MUK+T FAQ
1.How can I place an order for MAX6822MUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822MUK+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 MAX6822MUK+T reliable?
The price and inventory of MAX6822MUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822MUK+T is usually 5 days.
3.What payment methods are accepted for MAX6822MUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822MUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822MUK+T?
MAX6822MUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822MUK+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 MAX6822MUK+T?
For technical support, including MAX6822MUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822MUK+T requirements.
6.How does Aetrix verify that MAX6822MUK+T is sourced from the original manufacturer or authorized distributors?
All MAX6822MUK+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 MAX6822MUK+T meets industry standards.
7.What is the process for return or replacement of MAX6822MUK+T?
All MAX6822MUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822MUK+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 MAX6822MUK+T part is unused and in its original packaging.
Return procedure for MAX6822MUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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