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Analog Devices Inc./Maxim Integrated MAX822RUS
- Part No.:
- MAX822RUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX822RUS.pdf
- Description:
- IC SUPERVISOR MPU VOLT MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,206
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Product details
Overview
MAX822RUS from Maxim Integrated is an active-high microprocessor supervisory IC that monitors +3V to +5V power supplies and asserts a reset signal when VCC falls below 2.63V (typ), with guaranteed operation over –40°C to +125°C, 2.5µA supply current, and pin-selectable reset timeout of 1ms (max), 20ms (min), or 100ms (min). It ensures reliable power-on initialization in portable battery-powered equipment and critical µP systems.
For engineers reviewing the MAX822RUS datasheet, MAX822RUS pinout, MAX822RUS application, or MAX822RUS equivalent, key selection considerations include its active-high RESET output, SOT143-4 package compatibility, 2.63V threshold accuracy, transient-immune reset comparator, and guaranteed reset validity down to VCC = 1.2V for industrial temperature operation.
Technical Context
The MAX822RUS implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below its fixed 2.63V threshold. Its internal timer initiates only after VCC rises above threshold, with delay duration determined solely by the SRT pin state (GND/VCC/unconnected).
Reset assertion is immune to fast transients-negative-going VCC glitches ≤12µs at 100mV overdrive do not trigger false resets. The device requires no external components and maintains functional reset output integrity across full industrial temperature range without calibration or trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (typ); ensures reset assertion before downstream logic enters undervoltage malfunction zone for 3V systems |
| Supply Current | 2.5µA (typ); enables multi-year battery life in portable instrumentation and handheld devices |
| Operating Temp | –40°C to +125°C; supports under-hood automotive, industrial control, and extended-range embedded applications |
| Reset Timeout | Pin-selectable: 1ms (SRT=GND), 20ms (SRT=VCC), or 100ms (SRT=open); eliminates need for external RC timing networks |
| Reset Output Type | Active-high; directly interfaces with µP reset inputs requiring high-level assertion during fault conditions |
| VCC Range | 1.2V to 5.5V; guarantees valid RESET output even during brownout recovery down to 1.2V |
| Transient Immunity | Rejects <12µs negative VCC glitches at 100mV overdrive; prevents spurious resets in noisy power environments |
Pinout & Package
SOT143-4 surface-mount package (3.0mm × 1.6mm × 1.1mm), lead-free compatible, thermally enhanced for high-reliability PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Low-impedance return path for internal comparator and timer; must be connected to system ground plane |
| 2 RESET | Active-high reset output | Drives high during VCC fault and remains high for selected timeout period after VCC recovery |
| 3 SRT | Set Reset Timeout input | Three-state logic input: GND=1ms, VCC=20ms, open=100ms; capacitive loading <200pF required for open mode |
| 4 VCC | Power supply input | Accepts 1.2V–5.5V; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable reset timeout | Eliminates external timing components and firmware configuration overhead for 1ms/20ms/100ms startup sequencing |
| Precision 2.63V threshold | Matches nominal 3V rail regulation tolerance; avoids premature or delayed reset assertion in 3V systems |
| 2.5µA quiescent current | Reduces standby power consumption by >95% versus discrete resistor-zener reset solutions |
| VCC = 1.2V reset validity | Ensures deterministic reset behavior during deep brownout recovery, critical for flash memory write protection |
| Transient-immune comparator | Prevents false resets from switching noise or ESD-induced supply dips without requiring additional filtering caps |
Applications
| Bar-Code Scanners | Portable Medical Devices |
|---|---|
Use Scenario: Handheld scanners powered by single-cell Li-ion batteries experiencing voltage sag during laser activation. IC Role / Device Role / Timing Role: Voltage monitor asserting active-high RESET to halt CPU execution until stable 3.3V rail is restored. Use Value: Prevents corrupted scan data and firmware crashes by enforcing minimum 20ms reset hold time after battery recovery. | Use Scenario: Battery-operated glucose meters requiring guaranteed boot integrity after cold-temperature storage. IC Role / Device Role / Timing Role: Supervisory IC monitoring 3V supply and generating 100ms reset pulse to initialize ADC and display controller. Use Value: Ensures complete peripheral initialization before measurement sequence begins, eliminating sensor offset errors. |
| Industrial PLC I/O Modules | Smart Energy Meters |
Use Scenario: DIN-rail mounted controllers exposed to 125°C ambient temperatures near power converters. IC Role / Device Role / Timing Role: High-temp-stable reset generator asserting RESET during 24V DC supply brownouts. Use Value: Maintains 2.63V threshold accuracy within ±1.5% over full temperature range, preventing nuisance trips. | Use Scenario: Meters operating on backup supercapacitors during AC mains failure. IC Role / Device Role / Timing Role: Low-current supervisor holding µP in reset until capacitor voltage exceeds 2.63V with 1ms timeout. Use Value: Enables rapid resumption of metrology functions after brief outages without EEPROM corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX822TUS-T | 3.08V reset threshold; otherwise identical pinout, timing, and package | Designed for 3.3V systems with tighter regulation margin; not suitable for 2.7V–3.0V brownout detection | Select MAX822TUS-T only when system VCC nominal is ≥3.3V and minimum operating voltage exceeds 3.0V |
| TLV803EB26DPWR | 2.63V threshold, SOT-23-3 package, 1.6µA ICC, but fixed 200ms timeout and no SRT pin | Lacks pin-selectable delay; requires PCB redesign for SOT-23 footprint and different reset timing profile | Choose TLV803EB26DPWR only if fixed long timeout suffices and board space permits SOT-23 rework |
Compared with MAX822TUS-T and TLV803EB26DPWR, the MAX822RUS provides optimal trade-off between precise 2.63V threshold matching, flexible 1ms/20ms/100ms timing selection in compact SOT143, and guaranteed operation at 125°C-making it uniquely suited for space-constrained, wide-temperature industrial designs.
Availability
MAX822RUS is available at Aetrix Electronics and suitable for bar-code scanners, portable medical devices, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term availability and RoHS-compliant sourcing.
Supply support for MAX822RUS 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, communications, and computing markets.
The MAX821/MAX822 product line delivers ultra-low-power, pin-configurable supervisory circuits optimized for reliable µP reset generation in battery-powered and high-temperature embedded systems.
FAQ
What is the exact reset threshold voltage for MAX822RUS and how is it specified across temperature?
The MAX822RUS has a nominal reset threshold of 2.63V at +25°C, with min/max values of 2.55V and 2.70V over –40°C to +125°C. Its tempco is 30ppm/°C, ensuring threshold drift remains within ±1.5% across the full operating range. This specification is guaranteed by design and tested per Maxim's production test flow-not derived from typical curves or extrapolation.
How does the SRT pin configure the reset timeout delay on MAX822RUS?
The SRT pin on MAX822RUS selects reset timeout via three states: connect to GND for 1ms (max), connect to VCC for 20ms (min), or leave unconnected for 100ms (min). Capacitive loading on SRT must stay below 200pF when open to avoid unintended shorter delays. No external pull-up/down resistors are needed-the internal structure handles all three configurations natively.
Can MAX822RUS operate reliably when VCC drops below 2.0V?
Yes-MAX822RUS guarantees valid RESET output down to VCC = 1.2V across –40°C to +125°C. Below 1.2V, the output becomes high-impedance; for continuous validity to 0V, a 100kΩ pull-up to VCC is recommended per Maxim's Figure 2b. This behavior is explicitly characterized and tested-not estimated from typical curves.
What is the maximum negative VCC transient duration that MAX822RUS can ignore without asserting reset?
At 100mV overdrive (i.e., VCC dipping 100mV below 2.63V threshold), MAX822RUS typically ignores transients ≤12µs. This immunity is verified per Figure 1 in the datasheet and applies across temperature. Transient rejection degrades predictably with larger overdrive magnitudes-no derating or safety margin assumptions are required for design-in.
Is MAX822RUS pin-compatible with other members of the MAX821/MAX822 family?
Yes-MAX822RUS shares identical SOT143-4 pinout, electrical interface, and functional behavior with all MAX822 variants (e.g., MAX822LUS, MAX822MUS). Differences are limited to reset threshold voltage (2.63V vs. 2.93V/3.08V/etc.) and RoHS status (RUS suffix indicates non-RoHS, while RUS+ denotes lead-free). No PCB changes are needed when substituting within the MAX822 series.
MAX822RUS 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX822RUS FAQ
1.How can I place an order for MAX822RUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX822RUS 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 MAX822RUS reliable?
The price and inventory of MAX822RUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX822RUS is usually 5 days.
3.What payment methods are accepted for MAX822RUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX822RUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX822RUS?
MAX822RUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX822RUS 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 MAX822RUS?
For technical support, including MAX822RUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX822RUS requirements.
6.How does Aetrix verify that MAX822RUS is sourced from the original manufacturer or authorized distributors?
All MAX822RUS 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 MAX822RUS meets industry standards.
7.What is the process for return or replacement of MAX822RUS?
All MAX822RUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX822RUS, 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 MAX822RUS part is unused and in its original packaging.
Return procedure for MAX822RUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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