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Analog Devices Inc./Maxim Integrated MAX6822RUK
- Part No.:
- MAX6822RUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822RUK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,023
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Product details
Overview
MAX6822RUK from Maxim Integrated is an open-drain active-low microprocessor supervisory IC in SOT23-5 package, monitoring +2.63V supply with 140ms minimum reset timeout, 1.6s watchdog timeout, manual reset input, and guaranteed reset validity down to VCC = +1.0V for embedded controller power sequencing.
For engineers reviewing the MAX6822RUK datasheet, MAX6822RUK pinout, MAX6822RUK application, or MAX6822RUK equivalent, this device supports critical brownout detection, watchdog-based firmware recovery, and manual reset integration in space-constrained industrial and portable systems requiring reliable µP startup and fault recovery.
Technical Context
The MAX6822RUK implements a voltage monitor with fixed 2.63V threshold (suffix R), open-drain RESET output, and internal 140ms reset timeout timer that holds reset asserted after VCC recovers above threshold. Its watchdog circuit triggers reset if WDI remains static beyond 1.6s, cleared by any edge transition.
It features a debounced MR input with 50kΩ internal pullup, operates from VCC = +1.2V to +5.5V, and guarantees valid reset assertion down to VCC = +1.0V - enabling robust operation during deep brownouts. Immunity to short negative VCC transients (<20µs at 100mV overdrive) avoids spurious resets in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±10mV (fixed, suffix R); ensures precise brownout detection for +2.7V–+3.0V logic rails |
| Reset Timeout | 140ms min; provides sufficient hold time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s nominal; enables firmware execution monitoring without excessive interrupt overhead |
| RESET Output Type | Active-low open-drain; allows wired-OR with other reset sources and bidirectional µP reset pins |
| VCC Operating Range | +1.2V to +5.5V; supports wide-input battery-powered and multi-rail embedded systems |
| Reset Validity Limit | VCC ≥ +1.0V; guarantees functional reset assertion even during severe undervoltage conditions |
| MR Input Pullup | 50kΩ internal; eliminates external components for manual reset switch interface |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, 2.9mm × 1.6mm footprint, 1.1mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup for logic-high state; sinks ≥50µA at VCC ≥1.0V |
| 2 | GND | Ground reference; must be low-impedance connection to system common ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (50kΩ); asserts reset when pulled ≤0.3×VCC |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal 1.6s timer on each transition |
| 5 | VCC | Supply and monitored voltage input; powers device and sets reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.63V threshold | Matches +2.7V/3.0V system rails with ±10mV tolerance across -40°C to +125°C |
| Open-drain RESET | Enables shared reset bus with multiple supervisors or µPs using single pullup resistor |
| No external components | Integrates pullup on MR, hysteresis, timing capacitors, and voltage reference - reduces BOM count |
| 1.0V reset validity | Ensures deterministic reset behavior during deep brownout where many supervisors fail |
| Glitch-immune VCC sensing | Rejects <20µs negative transients at 100mV overdrive - prevents false resets in EMI-prone environments |
Applications
| Industrial PLC Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Real-time control logic in programmable logic controllers subject to line fluctuations and EMI. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog enforcer ensuring µP restarts on brownout or firmware hang. Use Value: 140ms reset timeout aligns with I/O driver settling time; 2.63V threshold matches 2.7V FPGA core rail. | Use Scenario: Battery-powered glucose meters and infusion pumps requiring fail-safe boot and runtime integrity. IC Role / Device Role / Timing Role: Low-voltage supervisor asserting reset before Li-ion cell drops below 2.7V cutoff. Use Value: Guaranteed reset operation down to VCC = +1.0V enables last-chance recovery before complete power loss. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Microcontroller supervision in 12V automotive subsystems with load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Brownout detector and watchdog timer preventing corrupted EEPROM writes during voltage sags. Use Value: Immunity to 20µs negative VCC glitches avoids spurious resets during alternator switching events. | Use Scenario: Revenue-grade metering ICs operating from wide-range AC-DC supplies with seasonal voltage variation. IC Role / Device Role / Timing Role: Primary reset source coordinating MCU, RTC, and metrology ASIC power-up sequence. Use Value: Open-drain RESET allows direct tie-in with isolated communication ICs sharing same reset domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326R26 | Push-pull active-low RESET; no watchdog; 2.63V threshold; same SOT23-5 package | Lacks watchdog functionality; suitable only where firmware monitoring is handled externally | Select when watchdog is unnecessary and board layout requires push-pull drive strength |
| TPS3808G26DBVR | Open-drain active-low RESET; 2.63V threshold; 200ms reset timeout; no manual reset input | Omits MR pin; relies solely on VCC monitoring and optional external trigger | Choose when manual reset is not required and longer timeout improves noise immunity |
Compared with MAX6822RUK, MAX6326R26 removes watchdog capability but adds push-pull drive, while TPS3808G26DBVR extends reset timeout and removes MR - making MAX6822RUK uniquely balanced for compact designs needing all three functions (voltage monitor, watchdog, manual reset) in one SOT23-5 device.
Availability
MAX6822RUK is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical devices, automotive body control modules, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6822RUK 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 power management ICs for industrial, automotive, and communications applications.
The MAX682x series targets space-constrained embedded systems needing integrated voltage monitoring, watchdog, and manual reset - delivering high reliability in minimal SOT23-5 footprint.
FAQ
What is the exact reset threshold voltage for MAX6822RUK?
The MAX6822RUK has a factory-programmed reset threshold of 2.63V, with tolerance of ±10mV over the full -40°C to +125°C temperature range. This value is fixed by the 'R' suffix and verified per the Threshold Suffix Guide in the datasheet. The MAX6822RUK uses this threshold to assert reset when VCC falls below 2.63V and maintain it for ≥140ms after VCC rises above the threshold.
Does MAX6822RUK include a watchdog timer, and what is its timeout period?
Yes, the MAX6822RUK includes a watchdog timer with a nominal timeout period of 1.6 seconds. It monitors the WDI pin and triggers a reset if no rising or falling edge occurs within that interval. The timer clears on any WDI transition, MR assertion, or active RESET. This feature is confirmed in the Selector Guide and Electrical Characteristics table, and applies specifically to the MAX6822RUK among the MAX6821–MAX6825 family.
What type of RESET output does MAX6822RUK provide, and how is it used?
The MAX6822RUK provides an active-low open-drain RESET output (Pin 1). It requires an external pullup resistor to VCC or another logic rail and can be wire-OR'd with other reset sources. This configuration enables direct interfacing with microcontrollers having bidirectional reset pins, such as the Motorola 68HC11, as documented in the Applications Information section of the MAX6822RUK datasheet.
Can MAX6822RUK operate reliably at very low supply voltages?
Yes, the MAX6822RUK guarantees valid reset assertion down to VCC = +1.0V, meaning its internal circuitry remains functional and RESET output behaves predictably even during deep brownout conditions. This is explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables, and distinguishes the MAX6822RUK from many competitors that lose reset validity below 1.5V.
Is there a manual reset input on MAX6822RUK, and what are its electrical characteristics?
Yes, the MAX6822RUK includes a manual reset input (MR, Pin 3) with an internal 50kΩ pullup resistor to VCC. It asserts reset when pulled to ≤0.3×VCC and has 100ns glitch rejection. MR remains active while low and for the full 140ms reset timeout after release. These specifications are confirmed in the Pin Description and Electrical Characteristics sections and apply identically to MAX6822RUK per the family documentation.
MAX6822RUK 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:
- 2.63V
- 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
MAX6822RUK FAQ
1.How can I place an order for MAX6822RUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822RUK 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 MAX6822RUK reliable?
The price and inventory of MAX6822RUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822RUK is usually 5 days.
3.What payment methods are accepted for MAX6822RUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822RUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822RUK?
MAX6822RUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822RUK 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 MAX6822RUK?
For technical support, including MAX6822RUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822RUK requirements.
6.How does Aetrix verify that MAX6822RUK is sourced from the original manufacturer or authorized distributors?
All MAX6822RUK 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 MAX6822RUK meets industry standards.
7.What is the process for return or replacement of MAX6822RUK?
All MAX6822RUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822RUK, 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 MAX6822RUK part is unused and in its original packaging.
Return procedure for MAX6822RUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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