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Analog Devices Inc./Maxim Integrated MAX6423XS31+T
- Part No.:
- MAX6423XS31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6423XS31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6423XS31+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 3.075V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors supply voltage in portable and battery-powered systems to prevent code-execution errors during power-up, brownout, or power-down events.
For engineers reviewing the MAX6423XS31+T datasheet, MAX6423XS31+T pinout, MAX6423XS31+T application, or MAX6423XS31+T equivalent, key selection criteria include reset threshold accuracy, ultra-low quiescent current (1.6µA typ), open-drain logic compatibility with multiple supply rails, immunity to short VCC transients, and SC70-4 package suitability for space-constrained embedded designs.
Technical Context
The MAX6423XS31+T implements a precision voltage-detection circuit using laser-trimmed resistors to set its 3.075V reset threshold, with hysteresis of 4 × VTH (≈12.3mV). Its reset assertion is triggered when VCC falls below this threshold, and deassertion is delayed by an externally adjustable timeout determined by a ramp current source (240nA) charging an SRT-to-ground capacitor.
As an open-drain device, it requires an external pullup resistor (10kΩ–100kΩ) to any logic rail up to 5.5V, enabling wired-OR reset configurations and interoperability with µPs operating at different I/O voltages. It guarantees valid RESET output down to VCC = 1V but does not support valid logic at VCC = 0 without external pulldown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V nominal, ±2.5% over -40°C to +125°C - ensures reliable detection across automotive/industrial temperature ranges |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0 to 1500pF) - supports µP reset timing requirements from fast-boot to safety-critical hold durations |
| Supply Voltage Range | 1.0V to 5.5V - operates through deep brownout and across 1.8V/3.3V/5V system rails |
| Output Type | Active-low open-drain - allows flexible pullup to any compatible logic rail and wired-OR reset bus sharing |
| VCC to Reset Delay | 80µs (VCC falling at 1mV/µs) - provides deterministic response to rapid supply collapse |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
The MAX6423XS31+T is housed in a 4-pin SC70-4 package (package code X4+1), measuring 2.0mm × 2.1mm × 0.95mm, with wettable flank leads for automated optical inspection. Pin 1 is SRT (Set Reset Timeout), Pin 2 is GND, Pin 3 is RESET (open-drain output), and Pin 4 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SRT) | Reset timeout capacitor input | Accepts external capacitor (CSRT) to program reset delay; 240nA internal ramp current charges CSRT to 0.65V reference |
| Pin 2 (GND) | Ground reference | Return path for internal circuitry and SRT capacitor discharge; must be low-impedance for accurate timeout |
| Pin 3 (RESET) | Open-drain reset output | Asserts low during VCC fault; requires external pullup; sinks ≥500µA at VCC ≥ 1.8V while maintaining VOL ≤ 0.3V |
| Pin 4 (VCC) | Supply and threshold monitor input | Powers device and sets reset threshold via internal resistor divider; valid operation guaranteed down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise timing tuning (275µs–5.75ms) without firmware or external logic, reducing BOM count and layout complexity |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset assertion even during severe brownout conditions where most supervisors fail |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold, preventing spurious resets in noisy power environments |
| Open-drain output with 5.5V-tolerant pullup | Permits direct interface to 1.8V, 3.3V, or 5V µP reset inputs and enables shared reset buses with auxiliary controllers |
| Laser-trimmed reset threshold accuracy | ±1.5% at +25°C and ±2.5% over full temperature range eliminates need for external calibration or margining |
Applications
| Portable Medical Sensors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Wearable ECG monitor powered by coin-cell battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M0+ during battery voltage sag below 3.075V. Use Value: Prevents corrupted sensor data logging and BLE packet loss by enforcing clean µP restart before supply collapse, leveraging 1.6µA ICC to extend battery life beyond 3 years. | Use Scenario: Remote RTU in oil-field telemetry system operating on LiSOCl₂ battery with -40°C to +85°C ambient exposure. IC Role / Device Role / Timing Role: Brownout detector holding µP in reset until regulated 3.3V rail stabilizes after cold-start, using 1500pF SRT capacitor for 4.375ms timeout. Use Value: Eliminates boot failures caused by slow-rising supplies in extreme temperatures, validated by ±2.5% VTH accuracy over full range and 125°C max junction rating. |
| Automotive Body Control Module | Smart Energy Metering Hardware |
Use Scenario: Low-voltage subsystem (e.g., door module) powered from vehicle battery with load-dump and start-stop transients. IC Role / Device Role / Timing Role: Open-drain RESET output pulled to 5V logic rail, enabling wired-OR with CAN transceiver fault signal to force system-wide reset. Use Value: Provides glitch immunity against 100mV/50µs transients per AEC-Q100-aligned design, avoiding false resets during engine cranking. | Use Scenario: DIN-rail mounted electricity meter with dual-supply architecture (3.3V MCU + 5V metrology ASIC). IC Role / Device Role / Timing Role: Single supervisor monitoring 3.3V rail while driving RESET line shared across both domains via 10kΩ pullup to 5V. Use Value: Enables cross-rail reset coordination without level shifters, reducing component count and PCB area in certified Class 0.5 meter designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6423US31+T | SOT143-4 package (larger footprint, 4-pin); identical electrical specs and reset threshold | Preferred where thermal mass or hand-soldering reliability outweighs size constraints | Select MAX6423US31+T for prototyping or high-reliability industrial assembly requiring larger pad geometry |
| NCP302LSN30T1G | Fixed 3.0V threshold (±2%), push-pull output, no capacitor-adjustable timeout, 1.8µA ICC | Lacks timeout flexibility and open-drain interoperability; suited only for simple fixed-delay use cases | Choose NCP302LSN30T1G only if design requires zero external components and accepts fixed 200ms timeout |
Compared with MAX6423XS31+T, the MAX6423US31+T offers identical supervision functionality in a more manufacturable SOT143 package, while the NCP302LSN30T1G trades adjustability and interface flexibility for minimal BOM count-making the MAX6423XS31+T optimal for space-constrained, multi-rail, or precision-timing applications.
Availability
MAX6423XS31+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial controllers, automotive body electronics, smart energy metering hardware, and critical µP monitoring systems requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MAX6423XS31+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The MAX6423XS31+T belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power microprocessor supervisors, designed specifically for reliable power-monitoring in battery-critical and thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6423XS31+T and how does it vary with temperature?
The MAX6423XS31+T has a nominal reset threshold of 3.075V, with ±1.5% accuracy at +25°C and ±2.5% over the full operating range of -40°C to +125°C. This is confirmed by Table 1 in the datasheet, where suffix "31" corresponds to min/typ/max values of 2.998V/3.075V/3.152V. The normalized threshold vs. temperature curve (toc08) shows drift within ±0.5% across the range, ensuring robust brownout detection in automotive and industrial environments.
Can MAX6423XS31+T drive a reset line referenced to a different supply voltage than VCC?
Yes, the MAX6423XS31+T features an open-drain RESET output rated for up to 5.5V, allowing connection to an external pullup resistor tied to any logic rail (e.g., 1.8V, 3.3V, or 5V), independent of its own VCC supply. This capability is explicitly documented in the Applications Information section and Figure 1, enabling seamless interfacing with µPs or FPGAs operating at mismatched I/O voltages without level shifters.
How is the reset timeout period set for MAX6423XS31+T, and what capacitor value yields a 4.375ms delay?
The reset timeout period for MAX6423XS31+T is set by connecting a capacitor (CSRT) between the SRT pin and ground. Using the formula tRP = 2.73 × 10⁶ × CSRT + 275µs (with tRP in seconds and CSRT in farads), a 4.375ms delay requires CSRT = (0.004375 − 0.000275) / 2.73 × 10⁶ ≈ 1500pF. This value is verified in the Electrical Characteristics table (tRP = 4.375ms at CSRT = 1500pF) and matches the typical operating characteristic plot toc04.
Is MAX6423XS31+T suitable for automotive applications, and does it meet AEC-Q100?
The MAX6423XS31+T itself is not individually AEC-Q100 qualified; however, the MAX6340UK31/V+T variant in the same family is explicitly listed as AEC-Q100 qualified in the Benefits and Features section. The MAX6423XS31+T shares identical electrical specifications, SC70 packaging, and -40°C to +125°C operating range, making it suitable for non-certified automotive subsystems (e.g., infotainment peripherals), but designers requiring formal qualification must select the MAX6340UK31/V+T or verify compliance via Analog Devices' automotive product roadmap.
What is the maximum leakage current specification for the RESET pin of MAX6423XS31+T when deasserted?
When the reset condition is not asserted (i.e., VCC > VTH), the RESET pin of MAX6423XS31+T exhibits a maximum leakage current of 1.0µA, as specified in the Electrical Characteristics table under "RESET Output Leakage Current, Open-Drain". This low leakage ensures minimal loading on the pullup resistor and prevents unintended logic-level shifts in high-impedance reset buses, especially critical in battery-powered systems where every nanoamp counts.
MAX6423XS31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6423XS31+T FAQ
1.How can I place an order for MAX6423XS31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423XS31+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 MAX6423XS31+T reliable?
The price and inventory of MAX6423XS31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423XS31+T is usually 5 days.
3.What payment methods are accepted for MAX6423XS31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423XS31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423XS31+T?
MAX6423XS31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423XS31+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 MAX6423XS31+T?
For technical support, including MAX6423XS31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423XS31+T requirements.
6.How does Aetrix verify that MAX6423XS31+T is sourced from the original manufacturer or authorized distributors?
All MAX6423XS31+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 MAX6423XS31+T meets industry standards.
7.What is the process for return or replacement of MAX6423XS31+T?
All MAX6423XS31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423XS31+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 MAX6423XS31+T part is unused and in its original packaging.
Return procedure for MAX6423XS31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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