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Analog Devices Inc./Maxim Integrated MAX6822SUK+
- Part No.:
- MAX6822SUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822SUK+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,463
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Product details
Overview
MAX6822SUK+ from Maxim Integrated is an open-drain reset, low-voltage microprocessor supervisory IC in a 5-pin SOT23 package, monitoring +2.93V supply (S-suffix), with 140ms minimum reset timeout, 1.6s watchdog timeout, manual reset input, and guaranteed reset validity down to VCC = +1.0V. It serves as a system-level power-on reset and brownout detector in embedded controllers and portable equipment.
For engineers reviewing the MAX6822SUK+ datasheet, MAX6822SUK+ pinout, MAX6822SUK+ application, or MAX6822SUK+ equivalent, this page delivers verified functional identity, exact threshold voltage (+2.93V), open-drain RESET output architecture, manual reset timing behavior, and confirmed watchdog timer interaction - all validated against Maxim's official 2014 datasheet Rev 3.
Technical Context
The MAX6822SUK+ implements a dual-function supervision architecture: a precision voltage monitor with hysteresis (2×VTH) and temperature coefficient of 60ppm/°C, plus an independent 1.6s watchdog timer cleared by WDI edge transitions. Its open-drain RESET output enables wired-OR configuration and direct interfacing with bidirectional µP reset pins like those on Motorola 68HC11.
It features internal 50kΩ MR pullup, glitch rejection (100ns), and immunity to negative VCC transients ≤20µs at 100mV overdrive. Reset assertion occurs on VCC fall below 2.93V, MR low, or WDI timeout - with reset held for ≥140ms after recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +2.93V (S-suffix), ±3% over -40°C to +125°C - sets precise brownout detection point for +3.3V systems |
| Reset Timeout Period | 140ms (min), 200ms (typ), 280ms (max) - ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s nominal (1.12–2.40s range), temperature-compensated - detects firmware hangs without requiring external timing components |
| Supply Current | 7µA (typ) at +3.6V, -40°C to +85°C - enables use in battery-powered equipment with multi-year standby life |
| Operating Voltage Range | +1.2V to +5.5V (over full temp range) - supports operation during deep brownout and guarantees reset validity down to +1.0V |
| RESET Output Type | Open-drain, 1.0µA leakage max when deasserted - allows flexible pullup selection and shared reset bus implementation |
| MR Input Logic | Active-low, 0.3×VCC VIH/VIL thresholds, 1µs min pulse width - compatible with CMOS logic and momentary switches without external debounce |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline, land pattern 21-0057), RoHS-compliant, surface-mount.
| 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 circuits and reset threshold comparator |
| 3 | MR | Manual reset input; internally pulled up to VCC (50kΩ); asserts reset when pulled ≤0.3×VCC; debounced and glitch-filtered (100ns) |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears 1.6s timer on transition; disabled if left floating or three-stated |
| 5 | VCC | Supply and monitored voltage input; powers device and feeds reset threshold comparator; valid operation from +1.2V to +5.5V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates voltage monitor, watchdog timer, manual reset logic, and reset generator - eliminates discrete RC networks and secondary supervisors |
| Guaranteed reset validity to VCC = +1.0V | Ensures reliable reset assertion even during severe brownout conditions where other supervisors fail silently |
| Immunity to short negative VCC transients | Withstands ≤20µs glitches at 100mV overdrive without spurious reset - avoids false triggers in noisy power environments |
| Debounced manual reset input | Internal filtering eliminates need for external RC or Schmitt-trigger circuits - simplifies PCB layout and reduces BOM count |
| Open-drain RESET output | Enables wired-OR reset buses and direct interface with bidirectional µP reset I/O (e.g., Motorola 68HC11) using single pullup resistor |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
Use Scenario: Power sequencing and fault recovery in digital video broadcast receivers with multiple voltage rails and long boot cycles. IC Role / Device Role / Timing Role: Primary reset supervisor asserting active-low open-drain RESET to SoC and peripheral controllers during cold start, brownout, or software hang. Use Value: Prevents corrupted firmware execution by holding reset until +3.3V rail stabilizes ≥140ms post-threshold crossing - matching typical STB power supply settling time. |
Use Scenario: Industrial PLC modules requiring deterministic restart after power interruption or watchdog timeout. IC Role / Device Role / Timing Role: System-level watchdog and voltage monitor interfacing with ARM Cortex-M µP via bidirectional reset pin. Use Value: Open-drain RESET output enables shared reset bus with µP - allowing either device to initiate reset without contention or level-shifting circuitry. |
| Portable/Battery-Powered Equipment | Critical µP Monitoring |
Use Scenario: Handheld test instruments powered by Li-ion batteries with dynamic voltage sag under load. IC Role / Device Role / Timing Role: Low-quiescent-current (+2.93V threshold) supervisor ensuring µP remains held in reset during battery voltage dip below 2.93V. Use Value: 7µA typical supply current extends battery life; guaranteed reset operation down to VCC = +1.0V prevents undetected brownout escape. |
Use Scenario: Medical diagnostic devices where uncontrolled µP operation could compromise patient safety. IC Role / Device Role / Timing Role: Dual-fault protection element monitoring both supply integrity and software execution via WDI. Use Value: Independent 1.6s watchdog timer detects infinite loops or ISR lockups - triggering hardware reset independent of voltage condition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6823SUK+ | Push-pull RESET output (not open-drain); identical threshold (+2.93V), watchdog, and MR functionality | Requires dedicated reset line; incompatible with wired-OR or bidirectional µP reset pins | Select when system needs active-high push-pull drive without external pullup or shared reset bus |
| TPS3808G33DBVR | Fixed +3.3V threshold, 200ms reset timeout, no manual reset input, same SOT23-5 package | Lacks MR and WDI - suitable only for basic voltage monitoring without user-initiated or software-watchdog reset capability | Select when design requires only power-on reset and brownout detection without manual intervention or firmware supervision |
Compared with MAX6822SUK+, MAX6823SUK+ provides identical supervision logic but replaces open-drain flexibility with push-pull drive strength, while TPS3808G33DBVR offers simplified fixed-threshold monitoring without manual or watchdog features - making MAX6822SUK+ the only choice for designs requiring all three functions in one SOT23-5 device.
Availability
MAX6822SUK+ 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 RoHS-compliant packaging.
Supply support for MAX6822SUK+ 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability-critical systems.
The MAX6821–MAX6825 family was engineered specifically for low-voltage microprocessor supervision in space-constrained, battery-sensitive, and fault-tolerant embedded systems - integrating voltage monitoring, watchdog, and manual reset in a single 5-pin SOT23.
FAQ
What is the exact reset threshold voltage of the MAX6822SUK+?
The MAX6822SUK+ has a factory-trimmed reset threshold of +2.93V (S-suffix), specified with ±3% tolerance over -40°C to +125°C. This value is confirmed in the Threshold Suffix Guide and Electrical Characteristics table of the official datasheet Rev 3. The MAX6822SUK+ uses this precise threshold to monitor +3.3V supply rails in embedded systems, ensuring reliable brownout detection before µP operation becomes unstable.
Does the MAX6822SUK+ support manual reset functionality?
Yes, the MAX6822SUK+ includes a fully integrated manual reset input (MR) with internal 50kΩ pullup to VCC. A logic-low pulse ≥1µs on MR asserts reset for the full timeout period (≥140ms), and the input rejects glitches <100ns. This feature is explicitly documented in the Pin Description and Applications Information sections of the MAX6822SUK+ datasheet, enabling pushbutton reset without external components.
What type of RESET output does the MAX6822SUK+ provide?
The MAX6822SUK+ provides an active-low open-drain RESET output (Pin 1), distinct from the push-pull variants in the same family (e.g., MAX6821/MAX6823). This architecture allows wired-OR connection with other reset sources and direct interface to bidirectional µP reset pins - a key differentiator confirmed in the Selector Guide and Pin Configurations section of the MAX6822SUK+ datasheet.
How does the watchdog timer in the MAX6822SUK+ operate?
The MAX6822SUK+ watchdog timer has a nominal 1.6s timeout (1.12–2.40s range), cleared by any rising or falling edge on the WDI pin. If WDI remains static beyond timeout, RESET asserts for ≥140ms. The timer is disabled if WDI is left floating or three-stated - behavior verified in the Watchdog Input section and Figure 3 timing diagram of the MAX6822SUK+ datasheet.
Is the MAX6822SUK+ compatible with low-voltage operation down to 1.0V?
Yes, the MAX6822SUK+ guarantees correct RESET output state and functional supervision down to VCC = +1.0V, as stated in the General Description and Electrical Characteristics tables. This ensures reliable reset assertion during deep brownout events where other supervisors may fail - a critical specification validated across -40°C to +125°C in the MAX6822SUK+ datasheet.
MAX6822SUK+ 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:
- 2.93V
- 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
MAX6822SUK+ FAQ
1.How can I place an order for MAX6822SUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822SUK+ 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 MAX6822SUK+ reliable?
The price and inventory of MAX6822SUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822SUK+ is usually 5 days.
3.What payment methods are accepted for MAX6822SUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822SUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822SUK+?
MAX6822SUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822SUK+ 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 MAX6822SUK+?
For technical support, including MAX6822SUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822SUK+ requirements.
6.How does Aetrix verify that MAX6822SUK+ is sourced from the original manufacturer or authorized distributors?
All MAX6822SUK+ 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 MAX6822SUK+ meets industry standards.
7.What is the process for return or replacement of MAX6822SUK+?
All MAX6822SUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822SUK+, 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 MAX6822SUK+ part is unused and in its original packaging.
Return procedure for MAX6822SUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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