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Analog Devices Inc./Maxim Integrated MAX822LUS
- Part No.:
- MAX822LUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX822LUS.pdf
- Description:
- IC SUPERVISOR MPU VOLT MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,011
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Product details
Overview
MAX822LUS from Maxim Integrated is an active-high microprocessor supervisory IC that monitors +4.63V power supplies and asserts a reset signal during brownout, power-up, or power-down events. It features pin-selectable reset timeout delays (1ms max, 20ms min, or 100ms min), operates across –40°C to +125°C, draws only 2.5µA supply current, and guarantees valid RESET output down to VCC = 1V. It is used in portable battery-powered equipment requiring reliable, low-power voltage monitoring.
For engineers reviewing the MAX822LUS datasheet, MAX822LUS pinout, MAX822LUS application, or MAX822LUS equivalent, this page delivers verified technical context, exact pin functionality, real-world application scenarios, and validated alternative options for industrial embedded and portable system designs.
Technical Context
The MAX822LUS implements a precision voltage comparator with 4.63V nominal reset threshold and ±1.5% accuracy over temperature, paired with a temperature-stable internal timer whose delay is set by the SRT pin state (GND/VCC/unconnected). Its active-high RESET output remains asserted for the full timeout period after VCC rises above threshold, and it ignores transients ≤12µs at 100mV overdrive.
Designed for direct integration into µP-based systems, the device requires no external components, supports 3V–5V supply ranges, and maintains functional reset assertion even as VCC decays to 1V - enabling robust boot sequencing in low-voltage portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal, ±1.5% over –40°C to +125°C - ensures reliable trip point for +5V systems with margin against regulation drift. |
| Supply Current | 2.5µA typical - enables multi-year operation in coin-cell–powered devices without compromising supervision integrity. |
| Reset Timeout Options | 1ms (max), 20ms (min), or 100ms (min) - selectable via SRT pin connection, supporting fast-boot scanners or slow-ramp industrial controllers. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and extended-range portable equipment. |
| VCC Range | 1.0V to 5.5V - allows valid RESET assertion down to 1V, ensuring deterministic state recovery before deep power collapse. |
| Reset Output Type | Active-high (RESET) - directly interfaces with µP reset inputs requiring high-asserted initialization without inversion logic. |
| Transient Immunity | Rejects VCC glitches ≤12µs wide at 100mV below threshold - prevents spurious resets from switching noise or ESD-induced dips. |
Pinout & Package
SOT-143 (4-pin) surface-mount package with 1.3mm × 2.1mm footprint, lead-free option available (MAX822LUS+T), thermal pad not included.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and timer; must be low-impedance to ensure accurate threshold sensing. |
| 2 RESET | Active-high reset output | Drives high during fault conditions and remains high for full timeout after VCC recovery; sinks 1.2mA at VTH(MAX). |
| 3 SRT | Set Reset Timeout input | Configures delay: GND → 1ms, VCC → 20ms, open → 100ms; capacitive loading <200pF required for open-mode reliability. |
| 4 VCC | Supply voltage input | Monitored rail (1.0V–5.5V); powers internal circuitry and determines reset assertion level and timing accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable reset timeout | Three discrete delay modes (1ms/20ms/100ms) set by SRT connection - eliminates need for external RC networks or firmware configuration. |
| +4.63V precision threshold | Guaranteed ±1.5% tolerance over full temperature range - matches standard +5V regulator tolerances without calibration. |
| Ultra-low quiescent current | 2.5µA typical - reduces standby power in always-on battery systems by >95% versus discrete supervisor solutions. |
| VCC = 1V reset validity | RESET remains logic-high down to 1V supply - ensures µP exits reset only when sufficient voltage is available for stable execution. |
| Transient-immune comparator | Rejects sub-12µs VCC dips up to 100mV below threshold - avoids false triggers from digital switching noise or board-level coupling. |
Applications
| Bar-Code Scanners | Portable Medical Devices |
|---|---|
|
Use Scenario: Handheld scanner powers on/off rapidly during intermittent use; supply rails experience fast ramp-up and brownout during battery depletion. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET until VCC stabilizes above 4.63V, then holding reset for 20ms to allow crystal oscillator startup and µP core stabilization. Use Value: Prevents corrupted firmware execution during marginal battery conditions while enabling instant wake-up without manual reset. |
Use Scenario: Battery-powered glucose meter operates across wide ambient temperatures and must retain calibration data during power cycling. IC Role / Device Role / Timing Role: Voltage monitor triggering controlled reset sequence before EEPROM write operations commence, ensuring memory controller is fully initialized. Use Value: Eliminates data corruption risk during low-VCC transitions, meeting IEC 62304 safety requirements for Class B medical electronics. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
|
Use Scenario: DIN-rail mounted I/O module endures wide input voltage swings (12–36V) and must survive load-dump transients without rebooting. IC Role / Device Role / Timing Role: Primary reset supervisor validating regulated 5V rail; SRT tied to VCC for 20ms timeout to accommodate slow LDO settling after input surge. Use Value: Maintains deterministic boot behavior despite upstream supply instability, reducing field failure rates in harsh factory environments. |
Use Scenario: BCM powers from vehicle battery subject to cranking dips (<6V) and alternator ripple; µC must avoid erratic behavior during engine start. IC Role / Device Role / Timing Role: Resets microcontroller when battery voltage falls below 4.63V, holding RESET high for 100ms after recovery to ensure full power rail stability. Use Value: Guarantees clean restart after cranking events, preventing CAN bus arbitration errors and unintended actuator activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809LUR+T | Fixed 4.63V threshold, 240ms reset timeout, SOT-23-3 package, no SRT pin. | Lacks pin-selectable delay; suited for systems where long fixed timeout suffices and board space is constrained. | Select when design prioritizes smallest footprint over delay flexibility and does not require sub-100ms recovery. |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, adjustable delay via external capacitor, 6-pin SOT-23. | Requires external timing capacitor; supports wider VCC range (0.8–6V) but mismatched threshold for +5V systems. | Choose only if redesign accommodates capacitor placement and threshold shift is acceptable for system margin analysis. |
Compared with MAX822LUS, MAX809LUR+T offers smaller size but forfeits delay configurability, while TPS3808G33DBVR adds external component dependency and threshold incompatibility - making MAX822LUS optimal for drop-in +5V supervision with adaptive timing.
Availability
MAX822LUS is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, automotive body control units, and bar-code scanners requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX822LUS 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, automotive, and computing applications, with emphasis on power management and reliability-critical functions.
The MAX822LUS belongs to Maxim's µP supervisory product line, engineered specifically for robust power-on reset generation in battery-constrained and thermally demanding embedded systems.
FAQ
What is the reset threshold voltage of the MAX822LUS?
The MAX822LUS has a nominal reset threshold of 4.63V, with guaranteed tolerance of ±1.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed during production and applies specifically to the MAX822LUS variant, as confirmed in the Maxim ordering table and electrical characteristics section.
How do I configure the reset timeout delay for MAX822LUS?
The MAX822LUS reset timeout is set using the SRT pin: connect SRT to GND for 1ms (maximum), to VCC for 20ms (minimum), or leave unconnected for 100ms (minimum). Capacitive loading on SRT must remain below 200pF when left open to prevent unintended mode selection - a requirement explicitly stated in the "Setting the Reset Timeout Delay" section of the datasheet.
Is MAX822LUS compatible with 3.3V systems?
No - the MAX822LUS is specified for 4.63V threshold and is intended for +5V-supplied systems. For 3.3V applications, Maxim offers variants like MAX822TUS (3.08V threshold) or MAX809 series. Using MAX822LUS in a 3.3V system would result in continuous reset assertion, as VCC never reaches the 4.63V trip point.
Does MAX822LUS support lead-free assembly?
Yes - the MAX822LUS is available in both leaded (suffix -T) and lead-free (suffix +T) versions. The lead-free variant MAX822LUS+T uses RoHS-compliant packaging and is rated for reflow per JEDEC J-STD-020, with peak temperature tolerance up to +260°C, as documented in Maxim's package information and materials analysis reports.
What is the minimum VCC required for valid RESET output from MAX822LUS?
The MAX822LUS guarantees valid active-high RESET output down to VCC = 1V, meaning the output remains logic-high and capable of driving a µP reset input even as supply voltage collapses. Below 1V, the output enters high-impedance state - a specification explicitly confirmed in the "Detailed Description" and "Ensuring a Valid RESET Output Down to VCC = 0V" sections of the datasheet.
MAX822LUS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- -
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX822LUS FAQ
1.How can I place an order for MAX822LUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX822LUS 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 MAX822LUS reliable?
The price and inventory of MAX822LUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX822LUS is usually 5 days.
3.What payment methods are accepted for MAX822LUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX822LUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX822LUS?
MAX822LUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX822LUS 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 MAX822LUS?
For technical support, including MAX822LUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX822LUS requirements.
6.How does Aetrix verify that MAX822LUS is sourced from the original manufacturer or authorized distributors?
All MAX822LUS 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 MAX822LUS meets industry standards.
7.What is the process for return or replacement of MAX822LUS?
All MAX822LUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX822LUS, 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 MAX822LUS part is unused and in its original packaging.
Return procedure for MAX822LUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX822LUS Tags
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MIC826SYMT-TR
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APX803S-31SA-7
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APX803L20-29SA-7
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