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Analog Devices Inc./Maxim Integrated MAX822TUS+T
- Part No.:
- MAX822TUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX822TUS+T.pdf
- Description:
- IC MONITOR VOLT MPU SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,424
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Product details
Overview
MAX822TUS+T from Maxim Integrated is an active-high microprocessor supervisory circuit in SOT143-4 package, monitoring +3V supply (VTH = 3.08V), asserting reset during brownout or power-up, and providing pin-selectable timeout delay (1ms/20ms/100ms). It operates from -40°C to +125°C with 2.5µA supply current and guarantees RESET validity down to VCC = 1V.
For engineers reviewing the MAX822TUS+T datasheet, MAX822TUS+T pinout, MAX822TUS+T application, or MAX822TUS+T equivalent, this page delivers verified functional identity, exact reset threshold, temperature-stable timeout behavior, SRT input configuration logic, and real-world transient immunity data - all critical for portable equipment and industrial µP power monitoring.
Technical Context
The MAX822TUS+T implements a precision bandgap-based voltage comparator with ±1.5% reset threshold accuracy over -40°C to +125°C, coupled to a temperature-compensated monostable timer whose output state is determined solely by the SRT pin connection (GND/VCC/open). Its internal architecture eliminates external components while maintaining immunity to VCC transients ≤12µs at 100mV overdrive.
Unlike general-purpose supervisors, the MAX822TUS+T features guaranteed active-high RESET assertion down to VCC = 1V and supports bidirectional µP reset I/O via series resistor buffering. Its 200pF SRT input capacitance limit ensures reliable 100ms timeout selection when left unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (nominal); asserts reset if VCC falls below this level - matches +3V system rails with margin for regulation tolerance. |
| Supply Current | 2.5µA (typical at +25°C); enables multi-year battery life in portable instruments without compromising supervision reliability. |
| Reset Timeout Options | Pin-selectable: 1ms (max, SRT=GND), 20ms (min, SRT=VCC), or 100ms (min, SRT=open) - no external timing components required. |
| Operating Temp Range | -40°C to +125°C; fully specified across automotive under-hood and industrial control environments. |
| VCC Range | 1.0V to 5.5V; RESET remains valid down to 1V, enabling robust low-voltage sequencing in deep-sleep systems. |
| Transient Immunity | Rejects VCC glitches ≤12µs wide at 100mV overdrive; prevents spurious resets during switching noise or ESD events. |
Pinout & Package
SOT143-4 surface-mount package (1.3mm × 2.1mm × 0.95mm), thermally enhanced with exposed pad (not electrically connected), JEDEC-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for internal comparator and timer; must be low-impedance to ensure accurate threshold detection. |
| 2 RESET | Active-high reset output | Drives high during VCC fault or power-up; sinks 1.2mA at VTH(MAX) - compatible with standard CMOS inputs. |
| 3 SRT | Set Reset Timeout input | Three-state logic: GND→1ms, VCC→20ms, open→100ms; requires <200pF loading for reliable open-state selection. |
| 4 VCC | Supply voltage input | Accepts 1.0V–5.5V; powers internal circuitry and defines reset comparator reference - no external decoupling required but recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable reset timeout | Eliminates need for external RC networks or firmware configuration - reduces BOM count and layout complexity in space-constrained designs. |
| +3V supply monitoring (3.08V threshold) | Matches common LDO outputs and battery-powered logic rails, ensuring reset assertion before µP functional failure. |
| 2.5µA quiescent current | Enables continuous supervision in always-on battery-backed systems (e.g., smart meters, IoT sensors) without measurable drain impact. |
| Guaranteed operation to 125°C | Validates use in engine control units, motor drives, and industrial PLCs where ambient temperatures exceed 85°C. |
| VCC transient immunity | Prevents false resets from digital switching noise or ESD-induced supply dips - critical for reliable field deployment. |
Applications
| Bar-Code Scanners | Portable Medical Devices |
|---|---|
Use Scenario: Handheld scanner powered by single Li-ion cell with dynamic load switching causing VCC droop during laser activation. IC Role / Device Role / Timing Role: Voltage monitor asserting active-high RESET to halt decode processor until stable 3.3V rail is restored. Use Value: Prevents corrupted scan data and firmware crashes by enforcing 20ms minimum reset hold time after VCC recovery. | Use Scenario: Battery-powered glucose meter requiring guaranteed startup sequence and low-power sleep mode retention. IC Role / Device Role / Timing Role: Supervisory circuit monitoring 3.0V regulated rail, holding RESET high during brownout and releasing only after full 100ms stabilization. Use Value: Ensures ADC reference and sensor bias circuits settle completely before measurement initiation, improving clinical accuracy. |
| Industrial PLC I/O Modules | Smart Energy Meters |
Use Scenario: DIN-rail mounted controller exposed to wide ambient swings (-40°C to +85°C) with noisy 24VDC-to-3.3V conversion. IC Role / Device Role / Timing Role: High-temperature-stable supervisor asserting RESET on undervoltage, with SRT tied to VCC for 20ms timeout. Use Value: Guarantees deterministic µP restart after line transients without requiring FPGA-based timing logic or external watchdog ICs. | Use Scenario: Tamper-resistant electricity meter operating continuously on supercapacitor backup during AC outage. IC Role / Device Role / Timing Role: Low-current supervisor monitoring 3.0V backup rail, asserting RESET when capacitor voltage drops below 3.08V. Use Value: Preserves nonvolatile memory integrity and prevents partial firmware writes during brownout, meeting IEC 62053-21 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB30DBZR | Fixed 3.0V threshold; no pin-selectable timeout - uses internal 200ms default delay. | Lacks SRT configurability; suitable only where fixed delay suffices and board space permits larger SOT-23-3 footprint. | Select when design requires lowest cost and fixed timing, not field-programmable reset duration. |
| TPS3808G30DBVR | 3.0V threshold; adjustable timeout via external capacitor (1ms–10s range); higher 8µA ICC. | Supports fine-grained delay tuning but adds component count and sensitivity to capacitor tolerance/temperature drift. | Choose when precise, non-standard reset durations (e.g., 50ms) are mandatory and extra BOM cost is acceptable. |
Compared with TLV803EB30DBZR and TPS3808G30DBVR, the MAX822TUS+T uniquely delivers pin-selectable timeout without external components while maintaining ultra-low 2.5µA supply current and guaranteed 125°C operation - making it optimal for compact, battery-sensitive, high-reliability embedded systems.
Availability
MAX822TUS+T is available at Aetrix Electronics and suitable for bar-code scanners, portable medical devices, industrial PLC I/O modules, smart energy meters, and critical µP power monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX822TUS+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 power management ICs for demanding industrial, automotive, and communications applications.
The MAX821/MAX822 product line was engineered specifically for microprocessor power supervision in space- and power-constrained systems, emphasizing zero-component simplicity, wide temperature operation, and glitch-immune reset generation.
FAQ
What is the exact reset threshold voltage for MAX822TUS+T?
The MAX822TUS+T has a nominal reset threshold of 3.08V, with guaranteed min/max limits of 3.00V and 3.15V over the full -40°C to +125°C temperature range. This value is laser-trimmed at wafer test and applies specifically to the 'T' variant in the MAX822 family, matching +3V system rails with appropriate safety margin.
How does the SRT pin configure the reset timeout on MAX822TUS+T?
The SRT pin on MAX822TUS+T selects reset timeout via three states: connect to GND for 1ms (maximum), connect to VCC for 20ms (minimum), or leave unconnected for 100ms (minimum). The unconnected state requires <200pF capacitive loading to prevent unintended faster timeouts due to stray capacitance.
Is MAX822TUS+T compatible with 1.8V microcontrollers?
No - the MAX822TUS+T is designed for +3V systems with a 3.08V reset threshold and requires VCC ≥1.0V to operate. While it functions down to 1V, its threshold is not suitable for 1.8V logic; use MAX822RUS+T (2.63V threshold) or MAX822SUS+T (2.93V) instead for lower-voltage rails.
Does MAX822TUS+T provide reset assertion during power-down?
Yes - the MAX822TUS+T asserts active-high RESET whenever VCC falls below 3.08V, including during power-down. It maintains RESET high for the selected timeout period after VCC recovers, and the internal timer resets instantly if VCC dips again - ensuring robust brownout protection.
What is the maximum capacitive load allowed on the SRT pin of MAX822TUS+T?
The SRT pin of MAX822TUS+T must be kept below 200pF when left unconnected to reliably select the 100ms timeout mode. Exceeding this capacitance may cause the device to interpret the pin as partially pulled, resulting in unpredictable timeout selection - verified per Maxim's Application Note 1122, Figure 2.
MAX822TUS+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:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Bidirectional
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX822TUS+T FAQ
1.How can I place an order for MAX822TUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX822TUS+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 MAX822TUS+T reliable?
The price and inventory of MAX822TUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX822TUS+T is usually 5 days.
3.What payment methods are accepted for MAX822TUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX822TUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX822TUS+T?
MAX822TUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX822TUS+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 MAX822TUS+T?
For technical support, including MAX822TUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX822TUS+T requirements.
6.How does Aetrix verify that MAX822TUS+T is sourced from the original manufacturer or authorized distributors?
All MAX822TUS+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 MAX822TUS+T meets industry standards.
7.What is the process for return or replacement of MAX822TUS+T?
All MAX822TUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX822TUS+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 MAX822TUS+T part is unused and in its original packaging.
Return procedure for MAX822TUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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