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Analog Devices Inc./Maxim Integrated MAX822MUS+T
- Part No.:
- MAX822MUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX822MUS+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,624
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Product details
Overview
The MAX822MUS+T from Maxim Integrated is an active-high microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor +3V to +5V power supplies and assert reset during brownout, power-up, or power-down events. It features a pin-selectable reset timeout of 1ms (max), 20ms (min), or 100ms (min), 2.5µA supply current, and guaranteed operation from −40°C to +125°C - ideal for portable and industrial embedded controllers.
For engineers reviewing the MAX822MUS+T datasheet, MAX822MUS+T pinout, MAX822MUS+T application, or MAX822MUS+T equivalent, key selection criteria include its active-high RESET output, 4.38V nominal reset threshold, SRT-controlled timeout configuration, and VCC-valid-to-1V reset assertion behavior specific to the MAX822 variant.
Technical Context
The MAX822MUS+T implements a precision voltage comparator with 30ppm/°C tempco to detect VCC falling below its 4.38V threshold, triggering an active-high RESET signal. Its internal timer initiates only after VCC rises above threshold, and timeout duration is determined solely by SRT pin state (GND/VCC/unconnected).
Reset assertion is immune to fast transients - e.g., a 100mV VCC dip lasting ≤12µs typically does not trigger reset. The device draws just 2.5µA at +25°C and maintains functional RESET output down to VCC = 1V, with open-drain-compatible drive capability (VOH ≥ 0.8VCC at ISOURCE = 150µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Reset Threshold | 4.38V - precisely matches 5V system brownout detection margin before logic failure |
| Supply Current | 2.5µA at +25°C - enables multi-year battery life in always-on portable instrumentation |
| Reset Timeout Options | 1ms (max), 20ms (min), or 100ms (min) - selected via SRT pin connection, no external timing components |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Output Type | Active-high RESET - directly interfaces with µP reset inputs requiring high-asserted initialization |
| VCC Range | 1.0V to 5.5V - ensures valid reset signaling even during deep brownout recovery |
Pinout & Package
MAX822MUS+T is housed in a lead-free 4-pin SOT143 package (3.0mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in handheld and sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and output stage; must be low-impedance for noise immunity |
| 2 RESET | Active-high reset output | Drives high during VCC fault and remains high for full timeout period; sinks ≤150µA at VOH |
| 3 SRT | Set Reset Timeout input | Configures delay: GND → 1ms, VCC → 20ms, open → 100ms; <200pF loading required for reliable 100ms mode |
| 4 VCC | Power supply input | Monitored rail; powers internal circuitry and defines reset threshold reference; tolerant to −0.3V to 6.0V |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable reset timeout | Three deterministic delays (1ms/20ms/100ms) set without resistors, capacitors, or firmware - reduces BOM count and layout risk |
| Low 2.5µA quiescent current | Enables use in energy-harvesting and coin-cell-powered devices where standby current dominates lifetime budget |
| −40°C to +125°C guaranteed operation | Validated across full industrial temperature range without derating - eliminates thermal validation overhead |
| VCC transient immunity | Rejects ≤12µs negative glitches down to 100mV below threshold - prevents spurious resets in noisy power environments |
| No external components required | Integrates precision reference, comparator, timer, and output driver - eliminates calibration and component tolerance stack-up |
Applications
| Bar-Code Scanners | Portable Medical Monitors |
|---|---|
Use Scenario: Handheld scanner experiences rapid on/off cycling and battery voltage sag during motor activation. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET until stable 5V rail is confirmed, with 20ms timeout matching MCU boot sequence. Use Value: Prevents corrupted scan data and firmware lockup by ensuring µP only exits reset after regulated VCC exceeds 4.38V for ≥20ms. | Use Scenario: Battery-powered ECG device operates intermittently with long sleep periods between measurements. IC Role / Device Role / Timing Role: Voltage monitor maintaining system integrity during cold-start from depleted Li-ion (3.0–3.2V), using 100ms timeout for full analog front-end stabilization. Use Value: Guarantees ADC reference and op-amp bias settle before sampling begins, eliminating baseline drift on first acquisition. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted controller endures wide ambient swings (−40°C to +85°C) and load-dump transients on 24V-derived 5V rail. IC Role / Device Role / Timing Role: High-temp-stable supervisor detecting 5V brownout caused by relay switching noise, asserting RESET with 1ms timeout for fast-recovery logic. Use Value: Maintains deterministic reset timing across temperature extremes, preventing watchdog timeout faults during thermal cycling. | Use Scenario: BCM powered from vehicle battery subject to cranking dips (down to 6V) and alternator ripple. IC Role / Device Role / Timing Role: Resets microcontroller when 5V LDO output falls below 4.38V during engine start, holding RESET high for 100ms post-recovery. Use Value: Ensures CAN transceiver and power relays reinitialize synchronously after voltage recovery - avoids bus arbitration errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB29DBZR | Fixed 2.93V threshold; no pin-selectable timeout; SOT-23-3 package | Lacks configurable delay and higher-voltage support - suitable only for 3V systems with fixed 200ms reset | Select when board space is critical and 2.93V threshold aligns with 3.3V rail tolerance |
| ADM6706ARZ-REEL | 4.63V threshold; manual reset input; SOIC-8 package; 20µA supply current | Includes manual reset button support and wider package pitch - better for serviceable industrial designs | Choose when field-service reset capability and SOIC hand-solderability outweigh ultra-low current needs |
Compared with TLV803EB29DBZR and ADM6706ARZ-REEL, the MAX822MUS+T uniquely combines 4.38V precision threshold, three factory-trimmed timeout options, and 2.5µA quiescent current in a 4-pin SOT143 - making it optimal for compact, battery-sensitive 5V systems requiring deterministic reset timing.
Availability
MAX822MUS+T is available at Aetrix Electronics and suitable for bar-code scanners, portable medical monitors, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX822MUS+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX821/MAX822 product line was engineered specifically for reliable, low-power microprocessor supervision in space- and energy-constrained systems - emphasizing pin-configurable timing, wide temperature operation, and minimal external component count.
FAQ
What is the exact reset threshold voltage for MAX822MUS+T?
The MAX822MUS+T has a nominal reset threshold of 4.38V, with guaranteed minimum and maximum values of 4.31V and 4.45V respectively over the full −40°C to +125°C temperature range. This threshold is factory-trimmed and specified in the Electrical Characteristics table of the official datasheet, ensuring precise detection of 5V supply brownout conditions without external calibration.
How do I configure the 100ms reset timeout on MAX822MUS+T?
To configure the 100ms (minimum) reset timeout on MAX822MUS+T, leave the SRT pin unconnected - i.e., do not tie it to GND or VCC. Ensure total capacitive loading on the SRT pin remains below 200pF to prevent unintended shorter timeouts; routing should avoid nearby signal traces or ground planes that increase stray capacitance.
Does MAX822MUS+T support operation down to 1V VCC?
Yes, the MAX822MUS+T guarantees valid active-high RESET output functionality down to VCC = 1V. Below 1V, the output stage ceases sourcing current and transitions to a high-impedance state. For continued validity near 0V, a pull-up resistor to VCC (e.g., 100kΩ) is recommended per the datasheet's Figure 2b.
Can MAX822MUS+T replace MAX821MUS+T in an existing design?
No - MAX822MUS+T cannot directly replace MAX821MUS+T because they have opposite reset polarities: MAX822MUS+T provides active-high RESET, while MAX821MUS+T provides active-low RESET. Swapping them would invert reset logic and likely cause system failure unless the host µP's reset input polarity is also inverted in firmware or hardware.
What package type and dimensions does MAX822MUS+T use?
MAX822MUS+T uses the SOT143 (also designated SOT-143-4) surface-mount package, measuring 3.0mm × 1.6mm × 1.1mm with a standard 0.95mm pin pitch. It is lead-free and RoHS-compliant, with pin 1 marked by a dot or notch on the package top, and pin order matching the top-view diagram in the datasheet: GND–RESET–SRT–VCC.
MAX822MUS+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
MAX822MUS+T FAQ
1.How can I place an order for MAX822MUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX822MUS+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 MAX822MUS+T reliable?
The price and inventory of MAX822MUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX822MUS+T is usually 5 days.
3.What payment methods are accepted for MAX822MUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX822MUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX822MUS+T?
MAX822MUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX822MUS+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 MAX822MUS+T?
For technical support, including MAX822MUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX822MUS+T requirements.
6.How does Aetrix verify that MAX822MUS+T is sourced from the original manufacturer or authorized distributors?
All MAX822MUS+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 MAX822MUS+T meets industry standards.
7.What is the process for return or replacement of MAX822MUS+T?
All MAX822MUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX822MUS+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 MAX822MUS+T part is unused and in its original packaging.
Return procedure for MAX822MUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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