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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:
- POWER SUPPLY SUPPORT CIRCUIT, AD
- Quantity:
- Payment:
- Shipping:
Inventory:796
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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 VCC falls below 3.075V (typical threshold, suffix "31"). 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 embedded systems requiring reliable power-on reset with configurable delay.
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, ±2.5% reset threshold accuracy over –40°C to +125°C, immunity to short VCC transients, and compatibility with µP reset inputs requiring valid logic above 1V.
Technical Context
The MAX6422XS31+ implements a precision voltage comparator with laser-trimmed resistors to detect VCC falling below its factory-set 3.075V threshold. Its reset timeout is generated by a 240nA internal current source charging an external capacitor (CSRT) to a 0.65V ramp threshold, enabling accurate, temperature-stable delay tuning.
Unlike open-drain variants, the MAX6422XS31+ drives RESET high actively during deassertion, eliminating need for external pull-up. Its push-pull output guarantees VOL ≤ 0.4V at ISINK = 3.2mA (VCC ≥ 4.5V) and VOH ≥ 0.8×VCC at ISOURCE = 800µA (VCC ≥ 4.5V), ensuring robust interfacing with CMOS µP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (typ), 2.998V to 3.152V (min/max), factory-laser-trimmed for precise brownout detection |
| Quiescent Current | 1.6µA (typ) at +25°C - enables multi-year battery life in portable equipment |
| Reset Timeout Base | 275µs minimum (CSRT = 0) - ensures minimum reset assertion even without external capacitor |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET assertion down to ultralow VCC, critical for graceful shutdown |
| Output Type | Active-high push-pull - eliminates external pull-up resistor and simplifies PCB layout |
| Threshold Accuracy | ±2.5% over –40°C to +125°C - ensures consistent reset behavior across automotive/industrial temperature range |
| VCC to Reset Delay | 80µs (VCC falling at 1mV/µs) - fast response to supply collapse prevents µP code corruption |
Pinout & Package
MAX6422XS31+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable and medical applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Set Reset Timeout Input | Connects to external capacitor (CSRT) to set timeout period per tRP = 2.73×10⁶×CSRT + 275µs; sensitive to leakage - requires short, clean trace |
| 2 - GND | Ground Reference | Primary return path for internal current sources and comparator; must be low-impedance for accurate threshold and timing |
| 3 - RESET | Active-High Push-Pull Reset Output | Drives high (≥0.8×VCC) or low (≤0.4V) actively; directly interfaces µP reset input without pull-up; sinks 3.2mA / sources 800µA |
| 4 - VCC | Supply Voltage & Threshold Monitor Input | Monitors system supply; powers internal circuitry; reset asserted when VCC < 3.075V; valid operation guaranteed down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise, application-specific delay tuning (e.g., 10ms–1s) using standard ceramic capacitors - no fixed delays or firmware dependency |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset state during deep brownout or battery depletion - prevents µP from executing undefined instructions |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - avoids spurious resets in noisy power environments |
| Low 1.6µA quiescent current | Minimizes standby power draw - essential for coin-cell or energy-harvesting systems where µA-level leakage matters |
| Factory-trimmed reset threshold | Eliminates external resistor networks and calibration; delivers ±2.5% accuracy over full temperature range without user trimming |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Wearable ECG sensor operating from CR2032 coin cell, requiring reliable power-on initialization and brownout recovery. IC Role / Device Role / Timing Role: MAX6422XS31+ monitors VCC and asserts active-high RESET to ARM Cortex-M0+ MCU until stable 3.0V rail is established and held for ≥10ms. Use Value: 1.6µA quiescent current extends battery life beyond 2 years; 3.075V threshold matches LiMnO₂ discharge profile; SC70-4 footprint saves board area. |
Use Scenario: Door module MCU subjected to load-dump and cold-crank transients in 12V vehicle electrical system. IC Role / Device Role / Timing Role: MAX6422XS31+ holds MCU in reset during VCC sag below 3.075V and maintains reset for configurable timeout after recovery - preventing erratic CAN communication. Use Value: Immunity to ≤50µs transients avoids false resets during alternator switching; –40°C to +125°C rating meets AEC-Q100 ambient requirements. |
| Industrial Programmable Logic Controllers | Portable Test & Measurement Instruments |
|
Use Scenario: DIN-rail mounted PLC with isolated 3.3V logic rail powered from wide-input DC-DC converter. IC Role / Device Role / Timing Role: MAX6422XS31+ supervises 3.3V rail and generates clean, glitch-free reset pulse to FPGA configuration controller after power-up sequencing. Use Value: Active-high push-pull output ensures fast, low-impedance reset assertion - critical for meeting FPGA TSTARTUP timing; ±2.5% threshold stability prevents marginal reset under thermal drift. |
Use Scenario: Handheld multimeter with dual-battery backup and LCD display, requiring fail-safe boot after battery swap. IC Role / Device Role / Timing Role: MAX6422XS31+ detects main battery insertion and asserts RESET until VCC reaches 3.075V and remains stable for ≥100ms (CSRT = 33nF). Use Value: Capacitor-adjustable timeout accommodates slow LDO startup; SC70-4 package fits tight front-panel PCB; guaranteed operation at VCC = 1V prevents partial initialization during battery transition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421XS31+ | Active-low push-pull RESET output; identical threshold, timing, and package | Requires µP with active-low reset input; incompatible with active-high-only reset pins | Select MAX6421XS31+ only if target µP mandates active-low assertion logic. |
| TLV803EB31DBVR | Fixed 3.08V threshold; 200ms factory-fixed timeout; SOT-23-3 package; 0.5µA IQ | Lacks adjustable timeout; smaller footprint but no capacitor tuning; lower IQ benefits ultra-low-power designs | Choose TLV803EB31DBVR when timeout is fixed and board space is premium; use MAX6422XS31+ when delay must be tuned per system requirements. |
Compared with MAX6421XS31+, the MAX6422XS31+ provides active-high reset polarity for direct interface with µPs lacking active-low support; compared with TLV803EB31DBVR, it trades fixed timing for design flexibility via external capacitor, at the cost of one extra pin and higher quiescent current.
Availability
MAX6422XS31+ is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and industrial programmable logic controllers requiring stable component supply, long-term lifecycle assurance, and lead-free compliance.
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 supervision in space- and energy-constrained embedded systems - delivering factory-trimmed thresholds, capacitor-tunable timing, and guaranteed operation across harsh temperature ranges.
FAQ
What is the exact reset threshold voltage of MAX6422XS31+?
The MAX6422XS31+ has a nominal reset threshold of 3.075V, with a guaranteed range of 2.998V (min) to 3.152V (max) over –40°C to +125°C. This value is factory-laser-trimmed and corresponds to the "31" suffix in the part number, per Table 1 of the datasheet.
Does MAX6422XS31+ require an external pull-up resistor on the RESET pin?
No. The MAX6422XS31+ features an active-high push-pull RESET output, which actively drives both high and low states. Unlike open-drain supervisors, it does not require an external pull-up resistor - simplifying schematic design and reducing BOM count.
How is the reset timeout period calculated for MAX6422XS31+?
The reset timeout period (tRP) of MAX6422XS31+ is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is in farads. For example, a 33nF capacitor yields ~93ms timeout. CSRT must be low-leakage ceramic (≤10nA) for accuracy.
Can MAX6422XS31+ operate reliably when VCC drops below 1.5V?
Yes. The MAX6422XS31+ guarantees valid RESET output functionality down to VCC = 1.0V, including proper assertion/deassertion timing and logic levels. This ensures robust reset behavior during deep brownout conditions common in battery-powered systems.
What package type is used for MAX6422XS31+ and what are its dimensions?
The MAX6422XS31+ uses the SC70-4 package (package code XS), measuring 2.0mm × 2.1mm with 0.5mm pin pitch. It is RoHS-compliant and lead-free, indicated by the "+" suffix in the part number.
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:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 3ms Minimum
- 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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