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Analog Devices Inc./Maxim Integrated MAX822SUS+T
- Part No.:
- MAX822SUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX822SUS+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,945
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Product details
Overview
MAX822SUS+T from Maxim Integrated is an active-high microprocessor supervisory circuit in SOT143-4 package, monitoring +2.93V supply voltage with ±1.5% threshold accuracy over -40°C to +125°C, 2.5µA quiescent current, and pin-selectable reset timeout (1ms/20ms/100ms). It ensures reliable power-on reset for battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX822SUS+T datasheet, MAX822SUS+T pinout, MAX822SUS+T application, or MAX822SUS+T equivalent, key selection factors include guaranteed RESET validity down to VCC = 1V, immunity to fast VCC transients (<12µs at 100mV overdrive), SRT input configuration logic, and compatibility with 3V µP systems requiring precise brownout detection.
Technical Context
The MAX822SUS+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC falling below 2.93V (±1.5%), asserting active-high RESET until VCC recovers and the internal timer expires. Its SRT pin selects one of three fixed timeout periods via GND/VCC/floating states-no external RC components required.
Designed for low-power embedded systems, it features 2.5µA supply current at +25°C, operates from 1.0V to 5.5V VCC, and maintains functional RESET output integrity across full industrial temperature range (-40°C to +125°C) without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - precisely matches 3V system brownout margin before µP functional failure |
| Supply Current | 2.5µA typical - enables multi-year battery life in portable equipment |
| Operating Temp | -40°C to +125°C - supports automotive under-hood and industrial control environments |
| Reset Timeout | Pin-selectable: 1ms (max), 20ms (min), or 100ms (min) - eliminates need for external timing components |
| VCC Range | 1.0V to 5.5V - ensures valid RESET assertion even during deep brownout recovery |
| Transient Immunity | Rejects <12µs negative VCC glitches at 100mV overdrive - prevents spurious resets in noisy power rails |
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 |
|---|---|---|
| GND | Ground reference | Return path for internal comparator and RESET driver; must be low-impedance connection to system ground plane |
| RESET | Active-high reset output | Drives high during VCC fault and remains high for selected timeout after VCC recovery; sinks 1.2mA at VTH(MIN) |
| SRT | Set Reset Timeout input | Logic-level controlled: GND = 1ms, VCC = 20ms, open = 100ms; requires <200pF capacitive loading for reliable 100ms mode |
| VCC | Supply voltage input | Power source for internal circuitry; monitors itself for undervoltage; accepts 1.0–5.5V with no external decoupling required |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable reset timeout | Three discrete delay options (1ms/20ms/100ms) implemented via simple SRT pin strapping-no firmware or external timing network needed |
| Precision 2.93V threshold | ±1.5% tolerance over full temperature range ensures consistent brownout detection across operating conditions without calibration |
| Ultra-low 2.5µA supply current | Enables direct integration into always-on battery-backed subsystems without measurable impact on standby runtime |
| VCC transient immunity | Rejects sub-12µs supply noise spikes, eliminating false resets in electrically harsh environments like motor drives or switching regulators |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic µP reset state during deep brownout recovery, critical for nonvolatile memory write protection |
Applications
| Bar-Code Scanners | Portable Medical Instruments |
|---|---|
Use Scenario: Handheld scanners powered by single-cell Li-ion batteries experiencing rapid voltage sag during laser activation. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET during VCC dip below 2.93V, holding reset for 20ms after recovery to ensure clean µP restart. Use Value: Prevents corrupted scan data and firmware lockup caused by partial execution during unstable power-up. | Use Scenario: Battery-operated glucose meters requiring guaranteed reset during cold-weather battery voltage drop. IC Role / Device Role / Timing Role: Voltage monitor detecting 2.93V threshold breach and generating 100ms reset pulse to guarantee full µC initialization before sensor sampling. Use Value: Eliminates false zero-readings or missed alarms due to incomplete boot sequence in low-temperature clinical use. |
| Industrial PLC I/O Modules | Smart Energy Meters |
Use Scenario: DIN-rail mounted modules exposed to 12VDC supply ripple from shared factory power bus. IC Role / Device Role / Timing Role: Brownout detector asserting RESET when VCC falls below 2.93V, with 1ms timeout to minimize process interruption during brief dips. Use Value: Maintains deterministic state machine behavior without requiring watchdog intervention or manual reset. | Use Scenario: Meters operating from supercapacitor backup during AC mains failure, with gradual VCC decay. IC Role / Device Role / Timing Role: Precision supervisor triggering 100ms active-high RESET to initiate secure shutdown and EEPROM save before VCC drops below 1.2V. Use Value: Preserves billing data integrity and prevents meter clock drift during extended outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | Fixed 1.2V threshold, 200ms default timeout, 1.8µA ICC, SOT23-5 package | Requires external resistor for timeout adjustment; lacks pin-selectable flexibility | Select when lower supply current and fixed 1.2V monitoring suffice, but accept added BOM item and layout complexity |
| ADM6705ARZ-REEL7 | 2.93V threshold, 200ms timeout, 3.5µA ICC, SOIC-8 package | Larger footprint, higher quiescent current, no pin-selectable timeout | Choose for through-hole prototyping or where SOIC-8 thermal mass improves reliability in high-vibration environments |
Compared with TPS3808G12DBVR and ADM6705ARZ-REEL7, the MAX822SUS+T delivers superior design efficiency via its 3-mode pin-strapped timeout, smallest SOT143 footprint, and lowest ICC among 2.93V supervisors-enabling compact, long-life portable designs without compromise.
Availability
MAX822SUS+T is available at Aetrix Electronics and suitable for bar-code scanners, portable medical instruments, industrial PLC I/O modules, smart energy meters, and battery-powered controllers requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX822SUS+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 and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX822SUS+T belongs to Maxim's µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in space-constrained portable and battery-critical systems.
FAQ
What is the exact reset threshold voltage for MAX822SUS+T and how tightly is it specified?
The MAX822SUS+T has a nominal reset threshold of 2.93V with ±1.5% tolerance over the full -40°C to +125°C temperature range. This specification is guaranteed by design and tested per Maxim's production test flow, ensuring consistent brownout detection across all operating conditions without user calibration. The 2.93V point aligns precisely with 3V system marginality requirements.
How does the SRT pin configure the reset timeout period on MAX822SUS+T?
The SRT pin on MAX822SUS+T selects reset timeout via three physical states: connect to GND for 1ms (maximum), connect to VCC for 20ms (minimum), or leave unconnected for 100ms (minimum). Capacitive loading on SRT must remain below 200pF to ensure reliable 100ms operation. No external resistors or timing components are required-this is pure hardware strapping.
Does MAX822SUS+T maintain valid RESET output when VCC drops below 1V?
Yes-the MAX822SUS+T guarantees valid active-high RESET output down to VCC = 1V. Below 1V, the RESET output transitions to high-impedance; for applications requiring validity to 0V, a 100kΩ pull-up resistor to VCC is recommended per Maxim's application guidance. This behavior is explicitly characterized and guaranteed in the datasheet.
What is the supply current consumption of MAX822SUS+T and how does it vary with temperature?
The MAX822SUS+T draws 2.5µA typical supply current at +25°C, with normalized variation of ±10% across -40°C to +125°C. This ultra-low ICC enables multi-year operation from coin cells or supercapacitors. The current remains stable regardless of SRT configuration or RESET state, making it ideal for always-on monitoring in portable equipment.
Can MAX822SUS+T reject short-duration power supply transients, and what is the immunity specification?
Yes-MAX822SUS+T rejects negative-going VCC transients up to 12µs duration when the glitch magnitude is 100mV below the 2.93V threshold. This immunity is characterized per Figure 1 in the datasheet and results from internal comparator hysteresis and filtering. Adding a 0.1µF ceramic capacitor near VCC further enhances robustness against switching noise.
MAX822SUS+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX822SUS+T FAQ
1.How can I place an order for MAX822SUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX822SUS+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 MAX822SUS+T reliable?
The price and inventory of MAX822SUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX822SUS+T is usually 5 days.
3.What payment methods are accepted for MAX822SUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX822SUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX822SUS+T?
MAX822SUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX822SUS+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 MAX822SUS+T?
For technical support, including MAX822SUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX822SUS+T requirements.
6.How does Aetrix verify that MAX822SUS+T is sourced from the original manufacturer or authorized distributors?
All MAX822SUS+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 MAX822SUS+T meets industry standards.
7.What is the process for return or replacement of MAX822SUS+T?
All MAX822SUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX822SUS+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 MAX822SUS+T part is unused and in its original packaging.
Return procedure for MAX822SUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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