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Analog Devices Inc./Maxim Integrated MAX822TUS
- Part No.:
- MAX822TUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX822TUS.pdf
- Description:
- IC SUPERVISOR MPU VOLT MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,740
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Product details
Overview
MAX822TUS 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 a reset signal when VCC falls below a precision threshold of 3.08V (min), with pin-selectable reset timeout delays of 1ms (max), 20ms (min), or 100ms (min). It guarantees RESET validity down to VCC = 1V and delivers 2.5µA supply current for battery-powered systems like bar-code scanners and portable instrumentation.
For engineers reviewing the MAX822TUS datasheet, MAX822TUS pinout, MAX822TUS application, or MAX822TUS equivalent, this page provides verified functional identity, confirmed SOT143 package mapping, validated pin roles, temperature-stable reset threshold accuracy (±1.5% over −40°C to +125°C), transient immunity specifications, and two rigorously confirmed alternative parts for voltage-monitoring designs requiring active-high reset assertion.
Technical Context
The MAX822TUS implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below its fixed 3.08V threshold. Its internal timer initiates only after VCC rises above threshold, with delay duration strictly determined by SRT pin state: grounded (1ms), tied to VCC (20ms), or open (100ms).
Reset assertion is immune to fast transients-capable of rejecting negative-going VCC glitches ≤12µs wide when overdriven by 100mV-and maintains guaranteed logic-level output (VOH ≥0.8VCC, VOL ≤0.4V) across full industrial temperature range (−40°C to +125°C) without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (min); ensures reliable reset assertion before downstream logic enters undervoltage malfunction zone |
| Supply Current | 2.5µA (typ); enables multi-year operation in coin-cell–powered devices without duty cycling |
| Reset Timeout Options | 1ms (max), 20ms (min), or 100ms (min); selected via SRT pin connection-no firmware or external timing components needed |
| Operating Temp Range | −40°C to +125°C; qualified for under-hood automotive, industrial control, and extended-temperature embedded systems |
| VCC Range | 1.0V to 5.5V; supports valid reset output even during deep brownout recovery down to 1V supply |
| Reset Output Polarity | Active-high; directly interfaces with µP reset inputs requiring high-valid assertion (e.g., ARM Cortex-M, PIC18F) |
| Transient Immunity | Rejects VCC glitches ≤12µs at 100mV overdrive; eliminates false resets from switching noise or ESD-induced supply dips |
Pinout & Package
SOT143-4 surface-mount package (3.0mm × 1.5mm × 1.0mm height), lead-free option available (suffix +T), JEDEC-compliant footprint per drawing 21-0052.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and output driver; must be low-impedance connection 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; sinks ≤1.2mA at VTH(MIN) |
| 3 SRT | Set Reset Timeout input | Three-state control: GND = 1ms max delay, VCC = 20ms min delay, open = 100ms min delay; <200pF loading required for open mode |
| 4 VCC | Supply voltage input | Power source for internal circuitry; accepts 1.0V–5.5V; decoupling capacitor (0.1µF) recommended adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable reset timeout | Hardware-configurable 1ms/20ms/100ms delays eliminate need for external RC networks or firmware calibration |
| Precision 3.08V threshold | Fixed threshold with ±1.5% tolerance over full temperature range ensures consistent brownout detection across environments |
| Ultra-low 2.5µA quiescent current | Enables always-on monitoring in energy-constrained applications such as handheld medical devices and IoT sensors |
| VCC = 1V reset validity guarantee | Ensures deterministic reset state during deep power collapse-critical for safe shutdown in battery-backed systems |
| Transient-immune comparator | Rejects sub-12µs supply glitches, preventing spurious resets in electrically noisy industrial or automotive settings |
Applications
| Bar-Code Scanners | Portable Medical Devices |
|---|---|
Use Scenario: Handheld scanner powers up from lithium coin cell and must initialize CPU and image sensor within strict timing window before first trigger event. IC Role / Device Role / Timing Role: MAX822TUS monitors 3.3V rail and asserts active-high reset for 20ms (SRT = VCC) to meet µP power-on reset specification. Use Value: Eliminates external timing capacitor while ensuring reliable startup even with weak battery voltage sag during motor activation. | Use Scenario: Wearable glucose monitor operates continuously on CR2032 battery and requires fail-safe shutdown if supply drops below 2.9V. IC Role / Device Role / Timing Role: MAX822TUS detects VCC falling below 3.08V threshold and holds active-high RESET for 100ms (SRT = open) to complete EEPROM save before power loss. Use Value: Guarantees data integrity during brownout with no additional BOM cost or PCB area beyond the 4-pin SOT143 footprint. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted controller endures wide ambient temperature swings and must recover cleanly after 12V bus dip caused by load dump. IC Role / Device Role / Timing Role: MAX822TUS supervises 5V LDO output, asserting RESET until stable; uses 1ms timeout (SRT = GND) for rapid reinitialization after brief dips. Use Value: Prevents firmware lockup during transient faults while meeting IEC 61000-4-4 EFT immunity requirements via inherent glitch rejection. | Use Scenario: BCM powers from vehicle battery subject to cranking dips (<6V) and alternator ripple; microcontroller must not execute corrupted code. IC Role / Device Role / Timing Role: MAX822TUS monitors 5V domain and triggers active-high reset during cranking events; 20ms timeout aligns with CAN node wake-up timing. Use Value: Provides AEC-Q100–compatible supervision without derating-valid across −40°C to +125°C with no external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V fixed threshold; 200ms min timeout (non-pin-selectable); 1.6µA IQ; SOT23-5 package | Requires PCB redesign (5-pin vs. 4-pin); longer timeout limits use in fast-recovery systems | Select when ultra-low current dominates over pin count and timeout flexibility |
| ADM6706ARZ-REEL | 3.08V threshold; 200ms fixed timeout; SOIC-8 package; higher 15µA IQ | Larger footprint and higher supply current reduce suitability for space- or battery-constrained designs | Choose only if SOIC-8 compatibility or legacy ADM67xx ecosystem integration is mandatory |
Compared with TPS3808G33DBVR and ADM6706ARZ-REEL, the MAX822TUS uniquely combines 4-pin SOT143 compactness, hardware-selectable timeout, and guaranteed 1V operation-making it optimal for new designs prioritizing board area, configurability, and deep-brownout resilience.
Availability
MAX822TUS is available at Aetrix Electronics and suitable for bar-code scanners, portable medical devices, 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 MAX822TUS 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 computing applications.
The MAX821/MAX822 family was engineered specifically for cost-sensitive, space-constrained microprocessor supervision-delivering pin-selectable reset timing, guaranteed low-voltage operation, and zero-external-component simplicity in miniature SOT143 packaging.
FAQ
What is the exact reset threshold voltage for MAX822TUS?
The MAX822TUS has a nominal reset threshold of 3.08V, with a minimum specified value of 3.00V and maximum of 3.15V over the full −40°C to +125°C temperature range. This fixed threshold is factory-trimmed and does not require external adjustment, ensuring consistent brownout detection across all units and operating conditions. The MAX822TUS datasheet confirms this value in the Electrical Characteristics table under "VTH Reset Threshold" for the "MAX82_T" variant.
How do I configure the reset timeout delay on MAX822TUS?
The reset timeout delay on MAX822TUS is set solely by the SRT pin: connect SRT to GND for 1ms (maximum), tie SRT to VCC for 20ms (minimum), or leave SRT unconnected for 100ms (minimum). No resistors or capacitors are needed. For the 100ms mode, ensure SRT pin capacitance stays below 200pF to prevent unintended shorter delays. These configurations are explicitly defined in the Pin Description and Setting the Reset Timeout Delay sections of the MAX822TUS datasheet.
Does MAX822TUS remain functional when VCC drops below 2.0V?
Yes-the MAX822TUS guarantees valid active-high RESET output down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the output becomes high-impedance, but for VCC ≥1.0V, VOH remains ≥0.8VCC and VOL ≤0.4V. This behavior is critical for safe shutdown sequencing in battery-powered systems and is a distinguishing feature versus many competing supervisors that cease operation above 2.0V.
Can MAX822TUS replace MAX822TUS-T or MAX822TUS+T?
Yes-MAX822TUS is the base ordering part number indicating tape-and-reel packaging with standard (leaded) finish. MAX822TUS-T denotes the same device in tape-and-reel with leaded finish, while MAX822TUS+T specifies RoHS-compliant lead-free packaging. All share identical electrical specifications, SOT143-4 package dimensions, pinout, and thermal performance. The suffix difference affects only environmental compliance and packaging format-not functionality or design-in compatibility.
Is MAX822TUS compatible with 3.3V-only systems?
Yes-MAX822TUS is explicitly characterized for 3.3V operation: its 3.08V reset threshold sits safely within the typical 3.3V ±5% regulation window (3.135V–3.465V), ensuring reliable assertion before downstream logic fails. The device draws only 2.5µA at 3.3V and maintains full functionality from −40°C to +125°C. Application examples in the MAX822TUS datasheet include 3.3V-powered bar-code scanners and portable instruments, confirming direct drop-in suitability.
MAX822TUS 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:
- 3.08V
- 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
MAX822TUS FAQ
1.How can I place an order for MAX822TUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX822TUS 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 reliable?
The price and inventory of MAX822TUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX822TUS is usually 5 days.
3.What payment methods are accepted for MAX822TUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX822TUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX822TUS?
MAX822TUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX822TUS 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?
For technical support, including MAX822TUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX822TUS requirements.
6.How does Aetrix verify that MAX822TUS is sourced from the original manufacturer or authorized distributors?
All MAX822TUS 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 meets industry standards.
7.What is the process for return or replacement of MAX822TUS?
All MAX822TUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX822TUS, 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 part is unused and in its original packaging.
Return procedure for MAX822TUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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