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Analog Devices Inc./Maxim Integrated MAX6422XS31
- Part No.:
- MAX6422XS31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6422XS31.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
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Product details
Overview
MAX6422XS31 from Maxim Integrated is a low-power microprocessor supervisor IC that monitors VCC supply voltage and asserts an active-high push-pull RESET signal when voltage falls below its factory-trimmed 3.075V threshold (±2.5% over temperature). It features capacitor-adjustable reset timeout (275µs base + 2.73s/F × CSRT), guaranteed operation down to VCC = 1V, and consumes only 1.6µA typical quiescent current. It is used in battery-powered controllers and portable medical instruments to ensure reliable power-on reset sequencing.
For engineers reviewing the MAX6422XS31 datasheet, MAX6422XS31 pinout, MAX6422XS31 application, or MAX6422XS31 equivalent, key selection criteria include its active-high push-pull output, SC70-4 package, 3.075V reset threshold with ±2.5% accuracy over –40°C to +125°C, capacitor-programmable timeout, and guaranteed reset validity at VCC ≥ 1V.
Technical Context
The MAX6422XS31 implements a precision voltage comparator with laser-trimmed resistors to detect VCC falling below its 3.075V threshold, triggering an active-high push-pull RESET output. Its reset timeout is generated by a 240nA internal ramp current charging an external capacitor (CSRT) to a 0.65V internal reference.
Unlike open-drain variants, the MAX6422XS31 drives RESET high actively during deassertion and low actively during assertion, eliminating need for external pull-up. It remains functional down to VCC = 1V, and its input stage is immune to short VCC transients ≤50µs when overdrive is 100mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V nominal, ±2.5% over –40°C to +125°C - ensures accurate brownout detection across automotive/industrial temperature range |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year battery life in always-on portable systems |
| Reset Output Type | Active-high push-pull - directly interfaces to µP reset inputs without external pull-up resistor |
| Minimum Valid VCC | 1.0V - guarantees RESET assertion/deassertion integrity during deep brownout conditions |
| Reset Timeout Base | 275µs minimum (CSRT = 0) - provides baseline reset hold time before capacitor extension |
| VCC to Reset Delay | 80µs maximum (VCC falling at 1mV/µs) - ensures fast response to supply collapse |
| Hysteresis | 4 × VTH (≈12.3mV) - prevents chatter near threshold during slow VCC transitions |
Pinout & Package
MAX6422XS31 is housed in a 4-pin SC70-4 package (JEDEC MO-203AA), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Set Reset Timeout Input | Connects to external timing capacitor (CSRT); 240nA ramp current charges it to 0.65V to set timeout period |
| 2 - GND | Ground Reference | Primary return path for internal circuitry and RESET output sink current |
| 3 - RESET | Active-High Push-Pull Output | Drives high (≥0.8×VCC) or low (≤0.4V at 3.2mA) to directly control µP reset pin |
| 4 - VCC | Supply & Voltage Monitor Input | Power source and monitored rail; device operates and asserts reset down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (e.g., 100ms with 36.6nF) to match specific µP requirements |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout, critical for fail-safe embedded controllers |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - avoids spurious resets in noisy environments |
| Low 1.6µA quiescent current | Minimizes battery drain in always-connected IoT sensors and portable diagnostics equipment |
| Laser-trimmed reset threshold | Delivers 3.075V with ±2.5% accuracy over full industrial temperature range - eliminates calibration overhead |
Applications
| Battery-Powered Medical Monitors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Portable ECG or glucose meter operating from single Li-ion cell with dynamic load-induced voltage sag. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high RESET to ARM Cortex-M0+ MCU upon VCC drop below 3.075V. Use Value: Prevents corrupted memory writes and firmware lockup during battery depletion, ensuring clinical data integrity. |
Use Scenario: Low-voltage wake-up event in BCM during vehicle ignition sequence with 12V supply ripple. IC Role / Device Role / Timing Role: Monitors 5V LDO output feeding CAN transceiver and microcontroller; holds system in reset until stable. Use Value: Eliminates CAN bus arbitration errors caused by premature MCU startup during power-rail settling. |
| Industrial Handheld Terminals | Smart Energy Meters |
|
Use Scenario: Ruggedized PDA with cold-temperature operation where VCC sags during RF transmission bursts. IC Role / Device Role / Timing Role: Provides 200ms capacitor-programmed reset timeout to allow complete RF power-down before MCU restart. Use Value: Avoids partial EEPROM writes and sensor initialization failures under transient load conditions. |
Use Scenario: Tamper-resistant meter with supercapacitor backup maintaining real-time clock during AC loss. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers controlled shutdown/reset when primary supply drops below 3.075V. Use Value: Guarantees accurate energy accumulation and secure state preservation during grid interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6422US31-T | Same electrical specs and reset threshold, but in 4-pin SOT143-4 package (larger footprint, different thermal resistance) | Suitable where board layout accommodates larger SOT143 or requires higher power dissipation margin | Select MAX6422US31-T only if SC70-4 assembly capability is unavailable or thermal derating above +70°C is required. |
| TLV803SDBZR | Fixed 3.08V threshold (±1%), 35µs min timeout, no capacitor adjustment; 1.8µA IQ; SOT23-3 package | Lacks programmable timeout and operates down to 0.8V VCC - better for ultra-low-voltage apps but less flexible timing control | Choose TLV803SDBZR only when fixed timeout suffices and smallest possible footprint (3-pin SOT23) is mandatory. |
Compared with MAX6422XS31, MAX6422US31-T offers identical supervision functionality in a thermally robust SOT143 package, while TLV803SDBZR trades adjustable timeout for smaller size and tighter threshold tolerance - making MAX6422XS31 optimal for designs requiring precise, field-tunable reset hold time in space-constrained SC70 layouts.
Availability
MAX6422XS31 is available at Aetrix Electronics and suitable for battery-powered medical monitors, automotive body control modules, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6422XS31 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, and computing applications.
The MAX6421–MAX6426 family was designed specifically for low-power, precision voltage monitoring in space- and energy-constrained embedded systems, emphasizing capacitor-programmable timing and guaranteed operation down to 1V.
FAQ
What is the exact reset threshold voltage of the MAX6422XS31?
The MAX6422XS31 has a factory-trimmed nominal reset threshold of 3.075V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This value corresponds to the "31" suffix per Table 1 in the datasheet and is laser-trimmed for precision without requiring external calibration.
Does the MAX6422XS31 require an external pull-up resistor on its RESET pin?
No, the MAX6422XS31 does not require an external pull-up resistor because it features an active-high push-pull RESET output. The IC actively drives the RESET line high (≥0.8×VCC) and low (≤0.4V at 3.2mA), enabling direct connection to most microcontroller reset inputs without additional components.
How is the reset timeout period calculated for the MAX6422XS31?
The reset timeout period tRP for the MAX6422XS31 is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is in farads. For example, a 100nF capacitor yields tRP ≈ 273ms + 275µs ≈ 273.3ms. The internal 240nA ramp current charges CSRT to a 0.65V reference to determine timeout.
Can the MAX6422XS31 operate reliably when VCC drops below 1.6V?
Yes, the MAX6422XS31 is fully specified to operate and assert valid RESET down to VCC = 1.0V. Its internal circuitry remains functional and guarantees correct reset logic polarity and timing integrity even at this minimum supply voltage, supporting robust brownout recovery in deeply discharged battery scenarios.
What package type is used for the MAX6422XS31, and what are its key mechanical dimensions?
The MAX6422XS31 uses the 4-pin SC70-4 package (JEDEC MO-203AA), with footprint dimensions of 2.0mm × 2.1mm and maximum height of 0.95mm. It features gull-wing leads and an unconnected exposed pad, optimized for high-density PCB layouts in portable and wearable electronics.
MAX6422XS31 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- 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:
- SC-70-4
MAX6422XS31 FAQ
1.How can I place an order for MAX6422XS31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422XS31 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 MAX6422XS31 reliable?
The price and inventory of MAX6422XS31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422XS31 is usually 5 days.
3.What payment methods are accepted for MAX6422XS31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422XS31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422XS31?
MAX6422XS31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422XS31 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 MAX6422XS31?
For technical support, including MAX6422XS31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422XS31 requirements.
6.How does Aetrix verify that MAX6422XS31 is sourced from the original manufacturer or authorized distributors?
All MAX6422XS31 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 MAX6422XS31 meets industry standards.
7.What is the process for return or replacement of MAX6422XS31?
All MAX6422XS31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422XS31, 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 MAX6422XS31 part is unused and in its original packaging.
Return procedure for MAX6422XS31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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