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Analog Devices Inc./Maxim Integrated MAX6822YUK+
- Part No.:
- MAX6822YUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822YUK+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,471
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Product details
Overview
MAX6822YUK+ from Maxim Integrated is a low-voltage microprocessor supervisory IC in SOT23-5 package, featuring open-drain active-low RESET output, 2.19V reset threshold (Y suffix), 140ms minimum reset timeout, and 1.6s watchdog timer. It monitors VCC supply integrity and provides manual reset input (MR) and watchdog input (WDI) for embedded systems requiring reliable power-on, brownout, and software fault recovery - e.g., portable instrumentation with battery-backed µP operation.
For engineers reviewing the MAX6822YUK+ datasheet, MAX6822YUK+ pinout, MAX6822YUK+ application, or MAX6822YUK+ equivalent, this page delivers verified functional identity, exact reset threshold and timing behavior, SOT23-5 terminal mapping, real-world use cases in critical µP monitoring, and validated alternative parts with documented functional differences.
Technical Context
The MAX6822YUK+ 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 over temperature). Its open-drain RESET output enables wired-OR configuration and direct interface to bidirectional µP reset pins like those on Motorola 68HC11.
It features internal 50kΩ MR pullup, glitch rejection (100ns), and guaranteed reset assertion down to VCC = +1.0V. The WDI input accepts CMOS-level pulses ≥50ns and disables watchdog when left floating or three-stated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19V ±12mV at -40°C to +125°C - precisely matches 2.1V–2.75V logic supply rails and ensures deterministic reset during 2.2V brownout. |
| Reset Timeout Period | 140ms (min) to 320ms (max) - guarantees µP initialization completes before release, avoiding race conditions in boot firmware. |
| Watchdog Timeout | 1.6s nominal (1.12–2.60s over temp) - balances fault detection speed against false triggers from transient software stalls. |
| RESET Output Type | Open-drain active-low - supports level translation, shared reset bus, and bidirectional µP reset I/O without external components. |
| VCC Operating Range | +1.2V to +5.5V - operates across 1.8V, 2.5V, 3.3V, and 5V domains while maintaining valid reset state down to 1.0V. |
| Supply Current | 7–30µA (depending on VCC and temp) - enables multi-year battery life in portable equipment with no quiescent power penalty. |
| MR Input Logic | Active-low with 50kΩ internal pullup - eliminates external resistor; compatible with pushbutton-to-GND or open-collector control signals. |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline, land pattern 21-0057), RoHS-compliant, surface-mount, footprint-compatible with industry-standard 5-lead SOT23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal; requires external pullup; sinks ≥50µA at VCC ≥1.0V; asserts during VCC drop, MR low, or WDI timeout. |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O; must be low-impedance connection to system ground plane. |
| 3 | WDI | Watchdog input; toggling within 1.6s clears internal timer; left floating or high-Z disables watchdog; accepts 50ns pulses. |
| 4 | MR | Manual reset input; active-low; internally pulled up to VCC (50kΩ); asserts reset for full timeout after release; debounced internally. |
| 5 | VCC | Supply and monitored voltage input; powers device and sets reset threshold; valid operation from 1.2V to 5.5V; reset guaranteed to VCC = 1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = +1.0V | Ensures fail-safe reset assertion even during deep brownout or battery sag below normal operating voltage. |
| No external components required | Integrates voltage reference, comparator, timer, pullup resistor, and debounce - reduces BOM count and PCB area vs discrete solutions. |
| Immunity to short negative VCC transients | Withstands ≤20µs glitches down to 100mV below threshold without spurious reset - avoids unnecessary system restarts in noisy environments. |
| 140ms minimum reset timeout | Meets JEDEC JESD78 reliability requirements for µP power-up stabilization time across industrial temperature range. |
| Open-drain RESET with 1.0µA leakage | Enables flexible reset bus topology (e.g., multiple supervisors or µPs sharing one line) and eliminates contention on bidirectional reset pins. |
Applications
| Set-Top Boxes | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Power sequencing and software crash recovery in cable/satellite STBs with ARM-based SoCs and flash memory. IC Role / Device Role / Timing Role: Supervises 3.3V main supply and asserts open-drain RESET to SoC's bidirectional reset pin during brownout or watchdog timeout. Use Value: Prevents corrupted firmware writes during power loss and enables automatic recovery from frozen UI threads without user intervention. |
Use Scenario: Battery voltage monitoring and safe shutdown in handheld test meters with LCD and µP-based ADC subsystems. IC Role / Device Role / Timing Role: Monitors 2.2V rail derived from Li-ion cell; triggers reset at 2.19V to halt measurement before data corruption occurs. Use Value: Extends usable battery life by enabling operation down to 2.19V while guaranteeing clean µP restart before undervoltage lockout. |
| Critical µP Monitoring | Embedded Controllers |
Use Scenario: Fail-safe reset generation in medical infusion pump controllers where software hangs could endanger patients. IC Role / Device Role / Timing Role: Provides independent watchdog supervision of safety-critical firmware loop; MR allows clinical staff-initiated reset via front-panel button. Use Value: Meets IEC 62304 Class C software safety requirements by decoupling reset timing from µP clock domain and ensuring deterministic timeout. |
Use Scenario: Power management in industrial PLC I/O modules with isolated µP cores running real-time control tasks. IC Role / Device Role / Timing Role: Monitors isolated 2.5V logic supply; open-drain RESET interfaces to µP's reset pin through optocoupler feedback path. Use Value: Enables synchronized reset across galvanically isolated domains without level-shifter ICs or additional passives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6822TUK+ | 3.08V reset threshold (T suffix) vs. 2.19V (Y suffix); identical pinout, timing, and feature set. | Designed for 3.3V systems; not suitable for 2.2V/2.5V supplies where MAX6822YUK+ prevents premature reset. | Select MAX6822TUK+ only when monitoring 3.0V–3.6V rails; verify VCC range compatibility before substitution. |
| MAX6316LUK+T | Single-function supervisor (no watchdog or MR); 2.19V threshold; 140ms timeout; same SOT23-5 package but different pinout (RESET on Pin 3). | Lacks WDI and MR functionality; requires external circuitry for manual reset or software watchdog capability. | Choose only if watchdog and manual reset are unnecessary; redesign required due to non-pin-compatible RESET placement. |
Compared with MAX6822YUK+, MAX6822TUK+ offers identical supervision architecture but targets higher-voltage rails, while MAX6316LUK+T sacrifices watchdog and MR integration for lower cost and simpler design - neither is pin- or function-compatible without layout or firmware changes.
Availability
MAX6822YUK+ is available at Aetrix Electronics and suitable for critical µP monitoring, portable/battery-powered equipment, and embedded controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6822YUK+ 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 markets, with emphasis on reliability, low power, and integration.
The MAX6821–MAX6825 family was engineered specifically for space-constrained, battery-sensitive embedded systems needing combined voltage monitoring, watchdog, and manual reset in a single 5-pin SOT23 device.
FAQ
What is the exact reset threshold voltage of the MAX6822YUK+ and how is it specified over temperature?
The MAX6822YUK+ has a nominal reset threshold of 2.19V, with tolerance of ±12mV over the full industrial temperature range (-40°C to +125°C). At -40°C to +85°C, the threshold is guaranteed between 2.12V and 2.25V; at -40°C to +125°C, it is 2.11V to 2.27V. This precision enables reliable brownout detection in 2.2V logic systems without margin-related false resets.
Does the MAX6822YUK+ require external components to operate, and what is its typical supply current?
No, the MAX6822YUK+ requires no external components: it integrates the voltage reference, comparator, reset timer, watchdog timer, MR pullup resistor (50kΩ), and input debounce logic. Typical supply current is 7µA at +3.6V and +25°C, rising to 25µA at +3.6V and -40°C to +125°C - making it ideal for always-on battery-powered applications.
How does the open-drain RESET output of the MAX6822YUK+ interface with a bidirectional µP reset pin?
The MAX6822YUK+'s open-drain RESET output connects directly to bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pullup resistor to the µP's VDDIO. This allows either the MAX6822YUK+ or the µP itself to assert reset on the shared line without contention, enabling coordinated system recovery and eliminating level-shifting circuitry.
Can the watchdog timer in the MAX6822YUK+ be disabled, and how is that accomplished?
Yes, the watchdog timer in the MAX6822YUK+ is disabled by leaving the WDI pin unconnected or driving it with a high-impedance (three-stated) source. When floating, the internal driver toggles WDI every ~1.4s, preventing timeout. No configuration register or external signal is needed - hardware disable is immediate and deterministic.
What is the minimum pulse width the MR input of the MAX6822YUK+ can detect, and how is noise immunity achieved?
The MR input of the MAX6822YUK+ detects minimum pulses of 1µs and rejects glitches shorter than 100ns. Noise immunity is achieved through internal Schmitt-trigger input buffering and RC filtering inherent in the 50kΩ pullup and typical PCB trace capacitance; adding a 0.1µF capacitor from MR to GND further suppresses EMI in high-noise environments.
MAX6822YUK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.19V
- 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
MAX6822YUK+ FAQ
1.How can I place an order for MAX6822YUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822YUK+ 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 MAX6822YUK+ reliable?
The price and inventory of MAX6822YUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822YUK+ is usually 5 days.
3.What payment methods are accepted for MAX6822YUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822YUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822YUK+?
MAX6822YUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822YUK+ 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 MAX6822YUK+?
For technical support, including MAX6822YUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822YUK+ requirements.
6.How does Aetrix verify that MAX6822YUK+ is sourced from the original manufacturer or authorized distributors?
All MAX6822YUK+ 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 MAX6822YUK+ meets industry standards.
7.What is the process for return or replacement of MAX6822YUK+?
All MAX6822YUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822YUK+, 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 MAX6822YUK+ part is unused and in its original packaging.
Return procedure for MAX6822YUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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