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Analog Devices Inc./Maxim Integrated MAX6823WUK+T
- Part No.:
- MAX6823WUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6823WUK+T.pdf
- Description:
- IC UP SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
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Product details
Overview
MAX6823WUK+T from Maxim Integrated is a low-voltage microprocessor supervisory circuit in a 5-pin SOT23 package, featuring push-pull active-low RESET output, 1.67V reset threshold, 140ms minimum reset timeout, and integrated watchdog timer with 1.6s timeout period. It monitors VCC down to +1.0V and supports manual reset input for system-level recovery in embedded controllers and portable equipment.
For engineers reviewing the MAX6823WUK+T datasheet, MAX6823WUK+T pinout, MAX6823WUK+T application, or MAX6823WUK+T equivalent, this device delivers deterministic reset assertion during brownout, power-up, and software fault conditions - critical for reliable µP initialization in battery-powered instrumentation and set-top boxes.
Technical Context
The MAX6823WUK+T implements a voltage-monitoring comparator with 60ppm/°C temperature coefficient and 2×VTH hysteresis, ensuring stable reset threshold across -40°C to +125°C. Its internal 140ms reset timeout timer guarantees sufficient hold time after VCC recovery before releasing reset.
A dedicated watchdog transition detector monitors WDI for edges within 1.6s; absence triggers reset assertion. The MR input includes a 50kΩ internal pullup and 100ns glitch rejection, enabling direct switch-to-GND connection without external debounce components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.67V ±30mV (guaranteed over -40°C to +125°C; enables reliable supervision of 1.8V logic rails) |
| Reset Timeout Period | 140ms min (ensures µP remains held in reset long enough for stable clock and supply settling) |
| Watchdog Timeout | 1.6s nominal (detects firmware hangs in real-time embedded applications) |
| VCC Operating Range | +1.2V to +5.5V (supports operation during deep brownout; reset valid down to +1.0V) |
| RESET Output Type | Push-pull active-low (drives directly into µP reset pin without external pullup; sinks 3.2mA at VCC ≥4.25V) |
| MR Input Logic | Active-low with 50kΩ internal pullup (eliminates need for external resistor; compatible with CMOS and open-drain drivers) |
| WDI Pulse Width Support | 50ns minimum (allows fast edge detection from high-speed µP GPIO) |
Pinout & Package
MAX6823WUK+T is housed in a RoHS-compliant 5-pin SOT23-5 package (outline U5-1, land pattern 91-0174), measuring 2.9mm × 1.6mm × 1.1mm, suitable for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low on VCC drop, MR low, or watchdog timeout |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; 1µs minimum pulse width required |
| 4 | WDI | Watchdog input; edge-sensitive; toggling within 1.6s prevents reset assertion |
| 5 | VCC | Supply voltage and monitored rail; powers internal circuitry and sets reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates voltage monitor, watchdog timer, manual reset logic, and push-pull driver in single SOT23-5 IC |
| Guaranteed reset validity to VCC = +1.0V | Ensures fail-safe reset assertion even during severe brownout conditions where µP may still be partially functional |
| Immunity to short negative VCC transients | Withstands ≤20µs transients down to VTH −100mV without spurious reset, reducing false triggers in noisy power environments |
| Debounced manual reset input | Internal 100ns glitch rejection and 50kΩ pullup enable direct switch connection - no external RC network needed |
| 1.6s watchdog timeout with edge detection | Monitors µP software execution flow via WDI edges; detects stuck loops or halted code faster than polling-based methods |
Applications
| Set-Top Boxes | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Power sequencing and firmware crash recovery in digital cable receivers with multi-rail supplies. IC Role / Device Role / Timing Role: Supervises 1.8V core and 3.3V I/O rails; asserts RESET during cold start and brownout; resets µP on WDI timeout if UI thread hangs. Use Value: Prevents frozen UI states and channel lockups by enforcing hard reset when watchdog fails to detect software activity. |
Use Scenario: Power management in handheld test instruments operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Monitors declining battery voltage (1.67V threshold); holds µP in reset below safe operating voltage; enables user-initiated reset via front-panel button on MR pin. Use Value: Extends usable battery life by allowing operation down to 1.67V while guaranteeing clean restart before undervoltage-induced corruption. |
| Embedded Controllers | Intelligent Instruments |
Use Scenario: Industrial PLC modules requiring deterministic boot behavior after power interruption. IC Role / Device Role / Timing Role: Provides 140ms reset hold time post-power-up; integrates MR for service-mode reset; uses WDI to verify bootloader execution integrity. Use Value: Eliminates need for discrete RC reset circuits and external watchdog ICs - reduces BOM count and layout area by >40%. |
Use Scenario: Calibration-grade multimeters with real-time µP supervision during measurement cycles. IC Role / Device Role / Timing Role: Asserts RESET on VCC dip caused by analog front-end switching transients; monitors µP via WDI to catch ADC firmware stalls. Use Value: Maintains measurement accuracy by preventing corrupted readings due to partial µP execution during supply noise events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6822WUK+T | Same 1.67V threshold and 1.6s watchdog, but features open-drain RESET instead of push-pull | Requires external pullup resistor; necessary for bidirectional µP reset pins (e.g., Motorola 68HC11) | Select when interfacing with µPs that drive their own reset line and require wired-OR capability |
| TPS3808G16DBVR | 1.6V threshold, 200ms reset timeout, no manual reset input, no watchdog timer | Lacks MR and WDI functions; suited only for basic voltage monitoring without software supervision | Choose only if watchdog and manual reset are not required - reduces cost but sacrifices fault coverage |
Compared with MAX6823WUK+T, MAX6822WUK+T offers identical supervision accuracy and timing but requires external biasing for RESET, while TPS3808G16DBVR omits two critical reliability features (MR and watchdog), limiting its use to simpler power-good monitoring tasks.
Availability
MAX6823WUK+T is available at Aetrix Electronics and suitable for set-top boxes, portable/battery-powered equipment, and embedded controllers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6823WUK+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 power management ICs for demanding industrial, communications, and computing applications.
The MAX6821–MAX6825 family was developed specifically for low-voltage microprocessor supervision in space- and power-constrained systems, emphasizing guaranteed reset validity down to 1.0V and integrated watchdog functionality in ultra-small packages.
FAQ
What is the exact reset threshold voltage of the MAX6823WUK+T?
The MAX6823WUK+T has a factory-trimmed reset threshold of 1.67V, with tolerance of ±30mV over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Threshold Suffix Guide where "W" corresponds to 1.67V, and is validated in the Electrical Characteristics table under VTH for MAX682_W. The MAX6823WUK+T maintains this threshold with 60ppm/°C temperature coefficient.
Does the MAX6823WUK+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6823WUK+T includes a watchdog timer with a nominal timeout period of 1.6 seconds. As specified in the Electrical Characteristics table, the watchdog timeout (tWD) ranges from 1.12s to 2.40s over -40°C to +85°C, and from 0.80s to 2.60s over -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.
What type of RESET output does the MAX6823WUK+T provide, and how is it driven?
The MAX6823WUK+T provides an active-low push-pull RESET output. It drives low (VOL ≤ 0.4V at 3.2mA sink) when asserted and high (VOH ≥ 0.8×VCC) when deasserted. Unlike open-drain variants, it requires no external pullup resistor and can directly interface with standard µP reset inputs, including those with weak internal pullups.
Can the MAX6823WUK+T operate reliably at VCC voltages below its reset threshold?
Yes - the MAX6823WUK+T guarantees correct RESET output state down to VCC = +1.0V, well below its 1.67V reset threshold. This ensures fail-safe operation during deep brownout conditions where the monitored supply collapses but residual charge remains. The internal circuitry remains functional and asserts RESET as long as VCC stays above +1.0V.
Is manual reset functionality available on the MAX6823WUK+T, and how is it implemented?
Yes, the MAX6823WUK+T includes a manual reset (MR) input on Pin 3. It is active-low, internally pulled up to VCC with 50kΩ resistance, and accepts CMOS-compatible logic levels. A logic-low pulse ≥1µs on MR forces RESET assertion for the full 140ms timeout period, even if VCC is stable. Leaving MR unconnected disables manual reset without external components.
MAX6823WUK+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:
- 1.67V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6823WUK+T FAQ
1.How can I place an order for MAX6823WUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6823WUK+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 MAX6823WUK+T reliable?
The price and inventory of MAX6823WUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6823WUK+T is usually 5 days.
3.What payment methods are accepted for MAX6823WUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6823WUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6823WUK+T?
MAX6823WUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6823WUK+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 MAX6823WUK+T?
For technical support, including MAX6823WUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6823WUK+T requirements.
6.How does Aetrix verify that MAX6823WUK+T is sourced from the original manufacturer or authorized distributors?
All MAX6823WUK+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 MAX6823WUK+T meets industry standards.
7.What is the process for return or replacement of MAX6823WUK+T?
All MAX6823WUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6823WUK+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 MAX6823WUK+T part is unused and in its original packaging.
Return procedure for MAX6823WUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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