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Analog Devices Inc./Maxim Integrated MAX6822TUK+T
- Part No.:
- MAX6822TUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822TUK+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,130
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Product details
Overview
MAX6822TUK+T from Maxim Integrated is a low-voltage microprocessor supervisory IC in SOT23-5 package, featuring open-drain active-low RESET output, 3.08V reset threshold, 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 MAX6822TUK+T datasheet, MAX6822TUK+T pinout, MAX6822TUK+T application, or MAX6822TUK+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed operating parameters across -40°C to +125°C, and validated alternative options for µP supervision in battery-powered and critical embedded systems.
Technical Context
The MAX6822TUK+T integrates voltage monitoring, watchdog timer, and debounced manual reset in a single BiCMOS device. It asserts RESET when VCC falls below 3.08V (±3% over temperature), holds it for ≥140ms after VCC recovers, and monitors software execution via WDI with 1.6s timeout.
Its open-drain RESET output enables wired-OR configuration and direct interface with bidirectional µP reset pins (e.g., Motorola 68HC11), while internal 50kΩ MR pullup eliminates external components. Reset remains valid down to VCC = +1.0V, and immunity to sub-20µs negative VCC transients ensures robust operation in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% (guaranteed over -40°C to +125°C; enables precise supervision of 3.3V rails) |
| Reset Timeout Period | 140ms min (ensures µP completes power stabilization before release) |
| Watchdog Timeout | 1.6s nominal (detects firmware hangs in real-time embedded applications) |
| Supply Current | 7–25µA (enables multi-year battery life in portable equipment) |
| Operating Voltage Range | +1.2V to +5.5V (supports operation during brownout down to 1.2V) |
| RESET Output Type | Open-drain active-low (allows level-shifting and shared reset bus with other devices) |
| MR Input Logic | Active-low with 50kΩ internal pullup (no external resistor needed; CMOS-compatible) |
Pinout & Package
MAX6822TUK+T is housed in a RoHS-compliant 5-pin SOT23-5 package (outline 21-0057), footprint code U5-1, with 0.95mm pitch and thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; requires external pullup for logic-high 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); asserts reset when pulled ≤0.3×VCC |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; unconnected disables watchdog |
| 5 | VCC | Power supply and monitored voltage source; reset triggered if VCC drops below 3.08V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates pullup on MR, threshold reference, timer, and reset driver - reduces BOM count and PCB area |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion even during deep brownout conditions |
| Immunity to short negative VCC transients | Withstands ≤20µs glitches down to VTH −100mV without spurious reset |
| Debounced manual reset input | Internal filtering eliminates need for external RC network or firmware debounce |
| 1.6s watchdog timeout with edge-sensitive WDI | Detects stuck loops by requiring rising/falling edges - not just level changes |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
Use Scenario: Power management and firmware recovery in consumer STB platforms subject to unstable AC line and thermal cycling. IC Role / Device Role / Timing Role: Supervisory IC asserting reset during brownout and watchdog-triggered firmware crash recovery. Use Value: Prevents corrupted boot sequences and ensures deterministic restart after power interruption or code lockup. |
Use Scenario: Industrial control modules requiring fail-safe startup and runtime integrity checks. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor coordinating with µP reset pin and safety logic. Use Value: Guarantees system enters known state at power-on and detects stalled firmware within 1.6s. |
| Portable/Battery-Powered Equipment | Critical µP Monitoring |
Use Scenario: Handheld test instruments and medical sensors operating from single-cell Li-ion or coin cells. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor enabling long shelf life and reliable wake-from-deep-sleep recovery. Use Value: Draws only 7µA typical at 3.6V, extending battery life while maintaining 3.08V rail supervision accuracy. |
Use Scenario: Data acquisition systems where µP failure must trigger immediate hardware reset without software intervention. IC Role / Device Role / Timing Role: Hardware-enforced reset generator independent of µP clock or firmware state. Use Value: Provides fail-safe reset under VCC dropout, watchdog timeout, or operator-initiated MR event - no reliance on software. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6821TUK+T | Push-pull RESET output instead of open-drain; identical threshold, timeout, and WDI behavior | 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 bus requirements |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms reset timeout, no manual reset input, same SOT23-5 package | Lacks MR and WDI functions; suited for simpler voltage-only supervision without runtime watchdog or operator reset | Select when only power-rail monitoring is needed and manual reset/watchdog are unnecessary |
Compared with MAX6822TUK+T, MAX6821TUK+T offers push-pull drive but loses open-drain flexibility, while TPS3808G33DBVR simplifies design by removing MR/WDI but sacrifices runtime fault detection and user-initiated reset capability.
Availability
MAX6822TUK+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 RoHS-compliant sourcing.
Supply support for MAX6822TUK+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 targets low-voltage microprocessor supervision in space-constrained, battery-sensitive, and mission-critical embedded systems - delivering integrated voltage monitoring, watchdog, and manual reset in minimal footprint.
FAQ
What is the reset threshold voltage of the MAX6822TUK+T?
The MAX6822TUK+T has a factory-trimmed reset threshold of 3.08V, specified with ±3% tolerance over the full operating temperature range (-40°C to +125°C). This value is selected by the "T" suffix per the Threshold Suffix Guide and is optimized for monitoring 3.3V supply rails in embedded systems where accurate brownout detection is critical.
Does the MAX6822TUK+T require an external pullup resistor on the RESET pin?
Yes - the MAX6822TUK+T features an open-drain RESET output, so an external pullup resistor to VCC or another logic rail is required to establish a defined high state when reset is inactive. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. No pullup is needed on MR due to its internal 50kΩ resistor.
Can the watchdog function of the MAX6822TUK+T be disabled?
Yes - the watchdog function in the MAX6822TUK+T is disabled by leaving the WDI pin unconnected or by three-stating its driver. When floating, the internal watchdog timer is automatically cleared every ~1.4s by an internal pulse, preventing timeout. This allows use of the device solely for voltage monitoring and manual reset without software overhead.
What is the minimum VCC voltage at which the MAX6822TUK+T guarantees correct RESET output state?
The MAX6822TUK+T guarantees correct RESET output state down to VCC = +1.0V, meaning the reset signal remains valid and predictable even during severe brownout conditions. This specification ensures deterministic behavior far below the 3.08V threshold, supporting safe shutdown and recovery in low-power and battery-depleted scenarios.
How does the manual reset input (MR) behave on the MAX6822TUK+T?
The MR input on the MAX6822TUK+T is active-low with an internal 50kΩ pullup to VCC. Pulling MR ≤0.3×VCC asserts reset immediately and holds it for the full 140ms timeout period after MR returns high. Leaving MR unconnected defaults to logic-high (inactive), eliminating need for external components unless noise immunity requires a 0.1µF capacitor to GND.
MAX6822TUK+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:
- 3.08V
- 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
MAX6822TUK+T FAQ
1.How can I place an order for MAX6822TUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822TUK+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 MAX6822TUK+T reliable?
The price and inventory of MAX6822TUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822TUK+T is usually 5 days.
3.What payment methods are accepted for MAX6822TUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822TUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822TUK+T?
MAX6822TUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822TUK+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 MAX6822TUK+T?
For technical support, including MAX6822TUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822TUK+T requirements.
6.How does Aetrix verify that MAX6822TUK+T is sourced from the original manufacturer or authorized distributors?
All MAX6822TUK+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 MAX6822TUK+T meets industry standards.
7.What is the process for return or replacement of MAX6822TUK+T?
All MAX6822TUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822TUK+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 MAX6822TUK+T part is unused and in its original packaging.
Return procedure for MAX6822TUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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