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Analog Devices Inc./Maxim Integrated MAX822SUS
- Part No.:
- MAX822SUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX822SUS.pdf
- Description:
- IC SUPERVISOR MPU VOLT MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,158
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Product details
Overview
MAX822SUS from Maxim Integrated is an active-high microprocessor supervisory IC that monitors +2.93V supply rails, asserts a reset signal during brownout or power-up, and provides pin-selectable reset timeout delays of 1ms (max), 20ms (min), or 100ms (min). It operates across –40°C to +125°C, draws only 2.5µA, and guarantees valid RESET output down to VCC = 1V - ideal for battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX822SUS datasheet, MAX822SUS pinout, MAX822SUS application, or MAX822SUS equivalent, key selection criteria include its SOT143-4 package, 2.93V reset threshold, active-high reset logic, transient-immune comparator, and guaranteed operation over automotive temperature range without external components.
Technical Context
The MAX822SUS implements a precision voltage comparator with 30ppm/°C tempco and internal timer controlled by the SRT pin. Its reset assertion is immune to fast VCC transients ≤12µs when overdriven by 100mV below threshold, enabling robust operation in noisy power environments.
Unlike the MAX821, the MAX822SUS features an active-high RESET output synchronized to VCC monitoring and timeout delay. The SRT pin supports three discrete configurations: GND (1ms max), VCC (20ms min), or open (100ms min), with <200pF capacitive loading required for reliable 100ms selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal - precisely matches +3V system rails and ensures reset assertion before downstream logic fails. |
| Supply Current | 2.5µA typical - enables multi-year battery life in portable equipment without compromising supervision reliability. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial control, and extended-temperature embedded systems. |
| Reset Timeout | PIN-SELECTABLE: 1ms (max), 20ms (min), or 100ms (min) - eliminates need for external RC timing networks. |
| VCC Range | 1.0V to 5.5V - allows valid reset assertion even during deep brownout, with RESET guaranteed functional down to VCC = 1V. |
| Reset Accuracy | ±1.5% over full temperature range - ensures deterministic reset behavior without calibration or trimming. |
| Transient Immunity | Rejects VCC glitches ≤12µs at 100mV overdrive - prevents spurious resets in electrically noisy environments. |
Pinout & Package
SOT143-4 surface-mount package (4-pin, 1.3mm × 1.3mm footprint, 0.95mm height), lead-free compatible, JEDEC-compliant outline 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 for accurate threshold sensing. |
| 2 - RESET | Active-high reset output | Drives high during VCC fault or brownout; remains high for selected timeout after VCC recovery; sinks 1.2mA at VTH(max). |
| 3 - SRT | Set Reset Timeout input | Configures delay: GND = 1ms (max), VCC = 20ms (min), open = 100ms (min); requires <200pF loading for stable 100ms mode. |
| 4 - VCC | Supply voltage input | Monitored rail input; powers internal circuitry; valid operation from 1.0V to 5.5V; comparator ignores transients <12µs. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable reset timeout | Three factory-trimmed delay options (1ms/20ms/100ms) eliminate external timing components and layout dependencies. |
| +2.93V precision threshold | Matches standard +3V logic supply tolerance; ±1.5% accuracy over –40°C to +125°C avoids false resets in wide-temp applications. |
| Ultra-low quiescent current | 2.5µA typical draw extends battery life in always-on supervision circuits without sacrificing response speed. |
| VCC transient immunity | Internal filtering rejects short-duration supply noise (<12µs, 100mV overdrive), preventing erratic microprocessor resets. |
| Guaranteed RESET validity to 1V | Ensures clean, defined logic state during deep brownout - critical for safe microcontroller shutdown sequencing. |
Applications
| Bar-Code Scanners | Portable Medical Instruments |
|---|---|
|
Use Scenario: Handheld scanners powered by single-cell Li-ion batteries experience rapid VCC droop during laser activation and RF transmission. IC Role / Device Role / Timing Role: MAX822SUS monitors the +3V rail and asserts active-high RESET if VCC falls below 2.93V, holding reset for 20ms to ensure full microcontroller reboot. Use Value: Prevents corrupted scan data and firmware lockup during intermittent power sags, improving field reliability without adding BOM cost. |
Use Scenario: Battery-powered glucose meters and pulse oximeters require fail-safe power monitoring during low-battery shutdown sequences. IC Role / Device Role / Timing Role: MAX822SUS detects brownout on the regulated +3V supply and triggers 100ms reset hold to guarantee orderly memory save and display blanking. Use Value: Eliminates risk of data loss or erroneous readings during battery depletion, meeting IEC 62304 safety requirements. |
| Industrial PLC Controllers | Automotive Body Control Modules |
|
Use Scenario: Programmable logic controllers operate in electrically noisy factory environments with frequent 24V supply transients coupling into 3.3V logic rails. IC Role / Device Role / Timing Role: MAX822SUS supervises the +3V domain, rejecting sub-12µs noise spikes while asserting RESET for 1ms upon sustained undervoltage. Use Value: Maintains deterministic controller boot sequence despite EMI, reducing field failures caused by spurious resets. |
Use Scenario: Under-hood BCMs endure wide thermal swings (–40°C to +125°C) and load-dump transients affecting 3.3V domain stability. IC Role / Device Role / Timing Role: MAX822SUS provides temperature-stable 2.93V monitoring and 20ms reset hold, ensuring MCU initialization only after stable power is confirmed. Use Value: Meets AEC-Q100 Grade 0 requirements for reset integrity across full automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX822TUS | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, timing, and specs. | Better suited for +3.3V systems where tighter margin above 3.0V is required. | Select MAX822TUS when supervising 3.3V rails; MAX822SUS is optimal for 3.0V nominal supplies. |
| TLV803EB30DBZR | 2.93V threshold, SOT-23-3 package, fixed 200ms reset timeout, 0.5µA supply current. | Lacks pin-selectable delay and SOT143 footprint; lower current but no 1ms/100ms options. | Choose TLV803EB30DBZR only if ultra-low current dominates and fixed 200ms delay is acceptable. |
Compared with MAX822TUS, the MAX822SUS offers tighter alignment with 3.0V systems; compared with TLV803EB30DBZR, it delivers flexible timing and proven automotive-grade thermal performance in a compatible 4-pin footprint - critical for drop-in replacement in space-constrained designs.
Availability
MAX822SUS is available at Aetrix Electronics and suitable for portable medical instruments, industrial PLC controllers, automotive body control modules, bar-code scanners, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX822SUS 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 demanding industrial, automotive, and computing applications, with emphasis on reliability, low power, and integration.
The MAX821/MAX822 family was engineered specifically for cost-sensitive, space-constrained microprocessor supervision - delivering pin-selectable timing, wide-temperature operation, and zero-external-component simplicity in SOT143 packaging.
FAQ
What is the exact reset threshold voltage of the MAX822SUS?
The MAX822SUS has a nominal reset threshold of 2.93V, with guaranteed accuracy of ±1.5% over the full –40°C to +125°C operating temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under "VTH" for the MAX822SUS variant. The threshold remains stable with a tempco of 30ppm/°C, ensuring consistent performance across thermal extremes without recalibration.
How does the SRT pin configure the reset timeout delay on the MAX822SUS?
The SRT pin on the MAX822SUS selects one of three reset timeout periods: connect SRT to GND for 1ms (maximum), connect to VCC for 20ms (minimum), or leave unconnected for 100ms (minimum). For reliable 100ms operation, capacitive loading on SRT must remain below 200pF. Driving SRT with an external signal requires sub-500µs edge rates to avoid unintended timeout selection.
Is the MAX822SUS compatible with 1.8V or 2.5V supply rails?
No - the MAX822SUS is designed specifically for +3V systems with a 2.93V threshold and requires VCC between 1.0V and 5.5V for operation. While it functions down to VCC = 1V, its reset assertion point (2.93V) makes it unsuitable for reliable supervision of 1.8V or 2.5V rails. For those voltages, select variants like MAX822RUS (2.63V) or MAX822UUS (2.78V), respectively.
Does the MAX822SUS provide immunity to power supply transients?
Yes - the MAX822SUS reset comparator is designed to ignore fast negative-going VCC transients. Per the datasheet, it typically rejects glitches ≤12µs in duration when the transient magnitude is 100mV below the reset threshold. This immunity is achieved through internal filtering and is validated across temperature, making the MAX822SUS robust in electrically noisy environments such as motor drives or switching power supplies.
What package type and footprint does the MAX822SUS use?
The MAX822SUS uses the SOT143-4 package: a 4-pin, surface-mount, plastic encapsulated case measuring 1.3mm × 1.3mm with 0.95mm maximum height. Its JEDEC-compliant footprint (drawing 21-0052) features gull-wing leads and is compatible with standard reflow processes. Lead-free versions are marked with "+" suffix (e.g., MAX822SUS+), while standard versions use "-T" or no suffix.
MAX822SUS 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:
- 2.93V
- 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
MAX822SUS FAQ
1.How can I place an order for MAX822SUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX822SUS 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 reliable?
The price and inventory of MAX822SUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX822SUS is usually 5 days.
3.What payment methods are accepted for MAX822SUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX822SUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX822SUS?
MAX822SUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX822SUS 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?
For technical support, including MAX822SUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX822SUS requirements.
6.How does Aetrix verify that MAX822SUS is sourced from the original manufacturer or authorized distributors?
All MAX822SUS 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 meets industry standards.
7.What is the process for return or replacement of MAX822SUS?
All MAX822SUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX822SUS, 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 part is unused and in its original packaging.
Return procedure for MAX822SUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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