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Analog Devices Inc./Maxim Integrated MAX6822VUK-T
- Part No.:
- MAX6822VUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822VUK-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,462
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Product details
Overview
MAX6822VUK-T from Maxim Integrated is a low-voltage microprocessor supervisory circuit in 5-pin SOT23 package, featuring open-drain active-low RESET output, 1.58V reset threshold (V suffix), 140ms minimum reset timeout, and 1.6s watchdog timer. It monitors VCC supply integrity, asserts reset during brownout or power-up, and supports manual reset initiation - used in portable/battery-powered equipment requiring reliable µP supervision under low-VCC conditions.
For engineers reviewing the MAX6822VUK-T datasheet, MAX6822VUK-T pinout, MAX6822VUK-T application, or MAX6822VUK-T equivalent, key selection factors include its guaranteed reset validity down to VCC = +1.0V, immunity to short negative VCC transients, no external components requirement, and compatibility with bidirectional µP reset pins via open-drain topology.
Technical Context
The MAX6822VUK-T implements a voltage-monitoring comparator with 60ppm/°C temperature coefficient and 2×VTH hysteresis, paired with a monolithic 1.6s watchdog timer that clears on WDI edge transitions. Its reset generator enforces a minimum 140ms timeout after VCC recovery, MR de-bounce, and internal 50kΩ MR pullup.
RESET output is open-drain with <0.3V VOL at ISINK = 50µA (VCC ≥ 1.0V), enabling wired-OR configurations and direct interface to bidirectional µP reset I/O like Motorola 68HC11. Watchdog input accepts 50ns minimum pulse width and tolerates up to 10µA leakage when unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.58V ±30mV (V suffix); precise brownout detection for 1.8V systems operating near minimum supply |
| Reset Timeout Period | 140ms min; ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s nominal (–40°C to +85°C); provides robust software execution monitoring without excessive timeout latency |
| VCC Operating Range | +1.2V to +5.5V (–40°C to +125°C); supports ultra-low-voltage operation while maintaining reset validity down to +1.0V |
| Supply Current | 25µA max (–40°C to +125°C, VCC = +3.6V); enables use in battery-critical applications with minimal quiescent drain |
| RESET Output Type | Open-drain active-low; allows shared reset bus, level translation, and safe interfacing with bidirectional µP reset pins |
| MR Input Logic | Active-low with internal 50kΩ pullup; eliminates external resistor and enables momentary switch interface without debounce circuitry |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline), surface-mount, RoHS-compliant (lead-free version uses +T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; requires external pullup; sinks current only when asserted |
| 2 | GND | Ground reference for all internal circuits and reset comparator |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; 1µs minimum pulse width accepted |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset assertion; left floating disables watchdog |
| 5 | VCC | Power supply and monitored voltage input; reset threshold referenced to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset behavior even during deep brownout or battery sag below 1.2V |
| No external components required | Reduces BOM count and PCB area; integrates reset timing, watchdog, and MR debouncing on-chip |
| Immunity to short negative VCC transients | Tolerates ≤20µs glitches down to 100mV below threshold without spurious reset assertion |
| 1.6s watchdog with 50ns pulse detection | Enables fine-grained software health monitoring while rejecting noise-induced false triggers |
| Internal 50kΩ MR pullup | Permits direct connection of normally-open switch to GND; eliminates need for external pullup resistor |
Applications
| Portable/Battery-Powered Equipment | Intelligent Instruments |
|---|---|
Use Scenario: Handheld test meters and portable data loggers powered by single-cell Li-ion or alkaline batteries experiencing voltage sag during peak load. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset when VCC drops below 1.58V, preventing corrupted measurements or firmware lockup. Use Value: Guaranteed reset assertion down to VCC = +1.0V ensures system reliability even during deep discharge, extending usable battery life before forced shutdown. |
Use Scenario: Benchtop multimeters and oscilloscopes with embedded µPs managing calibration routines and display updates. IC Role / Device Role / Timing Role: Dual-function supervisor providing both power-on reset and watchdog protection against firmware hangs during self-test sequences. Use Value: 140ms reset timeout aligns with analog front-end stabilization time; open-drain RESET enables shared reset bus across multiple subsystems. |
| Embedded Controllers | Critical µP Monitoring |
Use Scenario: Industrial PLC I/O modules with ARM Cortex-M µPs executing real-time control loops in electrically noisy environments. IC Role / Device Role / Timing Role: Supervisory IC monitoring 3.3V rail and asserting reset on brownout, while WDI monitors main loop execution via GPIO toggle. Use Value: 1.6s watchdog timeout balances responsiveness and tolerance for brief interrupt latency; MR input allows field-service reset without power cycle. |
Use Scenario: Medical infusion pumps where µP failure could compromise patient safety, requiring fail-safe reset architecture. IC Role / Device Role / Timing Role: Primary reset supervisor with redundant monitoring: VCC threshold detection, manual reset for diagnostics, and independent watchdog timer. Use Value: Open-drain RESET permits OR-ing with secondary safety monitor outputs; guaranteed reset state at VCC = +1.0V meets IEC 62304 Class C requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6822TUK-T | 3.08V reset threshold (T suffix) vs. 1.58V (V suffix); identical pinout, timing, and feature set | Targets 3.3V systems instead of 1.8V/low-power rails; not suitable for sub-2V operation | Select MAX6822TUK-T only when monitoring 3.0V–3.3V supplies; MAX6822VUK-T is required for 1.8V systems with margin. |
| TPS3808G15DBVR | 1.5V threshold, push-pull RESET, 200ms timeout, 3.2µA ICC; no watchdog or MR input | Lacks watchdog and manual reset; suited for simple power-on reset only, not full µP supervision | Choose TPS3808G15DBVR for cost-sensitive, low-quiescent applications without watchdog needs; MAX6822VUK-T provides full supervision suite. |
Compared with MAX6822TUK-T, MAX6822VUK-T enables reliable supervision of 1.8V systems with tighter voltage margin; versus TPS3808G15DBVR, it adds critical watchdog and manual reset functions essential for autonomous embedded operation.
Availability
MAX6822VUK-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, and embedded controllers requiring stable component supply with guaranteed long-term availability and industrial temperature support (–40°C to +125°C).
Supply support for MAX6822VUK-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, medical, and communications applications.
The MAX6821–MAX6825 family delivers integrated µP supervision - combining voltage monitoring, watchdog, and manual reset - specifically for space-constrained, low-power embedded systems demanding robust power-up/down and fault recovery.
FAQ
What is the exact reset threshold voltage for MAX6822VUK-T?
The MAX6822VUK-T has a factory-trimmed reset threshold of 1.58V, with ±30mV tolerance over –40°C to +125°C. This value is specified in the Threshold Suffix Guide (V = 1.58V) and confirmed in the Electrical Characteristics table under VTH for MAX682_V. The device asserts reset when VCC falls below this threshold and holds it for ≥140ms after VCC rises above it.
Does MAX6822VUK-T include a watchdog timer, and what is its timeout period?
Yes, MAX6822VUK-T includes a watchdog timer with a nominal timeout period of 1.6s at +25°C, ranging from 1.12s to 2.40s over –40°C to +85°C. The timer resets on any rising or falling edge at the WDI pin and remains cleared while RESET is asserted. It is fully functional and documented in the Electrical Characteristics section under "Watchdog Timeout Period".
Can MAX6822VUK-T operate reliably at VCC = +1.0V?
Yes, MAX6822VUK-T guarantees correct RESET output state down to VCC = +1.0V, as explicitly stated in the General Description and Electrical Characteristics. This includes valid reset assertion and release behavior, enabling operation during deep battery discharge or severe brownout conditions where other supervisors fail.
What is the function of Pin 1 (RESET) on MAX6822VUK-T, and how should it be connected?
Pin 1 of MAX6822VUK-T is an open-drain active-low RESET output. It must be pulled up externally (typically 10kΩ to VCC) to generate a logic-high idle state. When asserted, it sinks current to ground. This configuration enables wired-OR reset buses and direct interface to µPs with bidirectional reset pins, such as the Motorola 68HC11, without level-shifting circuitry.
Is manual reset supported on MAX6822VUK-T, and what are the interface requirements?
Yes, MAX6822VUK-T supports manual reset via Pin 3 (MR), an active-low input with internal 50kΩ pullup to VCC. A logic-low pulse ≥1µs on MR forces reset assertion for ≥140ms after the pulse ends. No external components are needed - a normally-open switch between MR and GND suffices. MR accepts CMOS-level inputs and rejects <100ns glitches.
MAX6822VUK-T 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:
- 1.58V
- 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
MAX6822VUK-T FAQ
1.How can I place an order for MAX6822VUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822VUK-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 MAX6822VUK-T reliable?
The price and inventory of MAX6822VUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822VUK-T is usually 5 days.
3.What payment methods are accepted for MAX6822VUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822VUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822VUK-T?
MAX6822VUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822VUK-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 MAX6822VUK-T?
For technical support, including MAX6822VUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822VUK-T requirements.
6.How does Aetrix verify that MAX6822VUK-T is sourced from the original manufacturer or authorized distributors?
All MAX6822VUK-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 MAX6822VUK-T meets industry standards.
7.What is the process for return or replacement of MAX6822VUK-T?
All MAX6822VUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822VUK-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 MAX6822VUK-T part is unused and in its original packaging.
Return procedure for MAX6822VUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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