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Analog Devices Inc./Maxim Integrated MAX6390XS23D4-T
- Part No.:
- MAX6390XS23D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS23D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,840
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Product details
Overview
MAX6390XS23D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.31V VCC reset threshold (±2.5% over –40°C to +125°C), 1120ms VCC reset timeout, and 140ms manual reset timeout. It monitors single-supply voltages from +1.8V to +5.0V and consumes only 3μA at +1.8V, enabling reliable power-up/brownout detection in battery-powered embedded controllers.
For engineers reviewing the MAX6390XS23D4-T datasheet, MAX6390XS23D4-T pinout, MAX6390XS23D4-T application, or MAX6390XS23D4-T equivalent, key selection criteria include its 2.31V threshold accuracy, dual timeout timing (1120ms/140ms), SC70-4 package footprint, MR input with 1.56kΩ internal pullup, and guaranteed valid reset state down to VCC = 1V.
Technical Context
The MAX6390XS23D4-T implements a precision bandgap-based voltage comparator for VCC monitoring and a digital timeout counter triggered on threshold violation or MR assertion. Its open-drain RESET output requires an external pullup and supports wired-OR configurations in multi-rail systems.
Unlike earlier family members, MAX6390 features asymmetric timeout periods: a long 1120ms VCC reset hold time ensures full system stabilization after power recovery, while its short 140ms manual reset timeout enables rapid operator-initiated recovery without disrupting system timing budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.31V (nominal), ±2.5% over –40°C to +125°C - ensures accurate brownout detection across automotive and industrial temperature ranges |
| VCC Reset Timeout | 1120ms (min) - guarantees μP remains held in reset long enough for power rails and clocks to stabilize post-brownout |
| Manual Reset Timeout | 140ms (min) - enables fast, deterministic reset initiation via pushbutton without delaying system responsiveness |
| Supply Current | 3μA at +1.8V - extends battery life in portable instrumentation and IoT edge nodes |
| RESET Output Type | Open-drain active-low - allows level translation and shared reset bus implementation with other open-drain devices |
| MR Internal Pullup | 1.56kΩ - provides strong logic-high bias for noise immunity while permitting direct TTL/CMOS drive |
| Operating Voltage Range | +1.0V to +5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
Pinout & Package
MAX6390XS23D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and monitored voltage rail; powers internal circuitry and serves as reference for reset threshold detection |
| 2 | RESET | Open-drain active-low reset output; sinks current when asserted; requires external pullup resistor for logic-high state |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC with 1.56kΩ; asserts reset when driven ≤0.3×VCC |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for stable comparator operation |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.31V reset threshold | Eliminates external resistor networks and calibration effort for precise 2.3V rail monitoring |
| Asymmetric reset timeouts (1120ms VCC / 140ms MR) | Optimizes system reliability during power faults while preserving user interface responsiveness |
| Guaranteed RESET validity down to VCC = 1V | Ensures deterministic reset behavior even during severe undervoltage conditions before shutdown |
| 1.56kΩ MR internal pullup | Provides robust noise immunity against EMI in automotive and industrial environments without external components |
| Negative-going VCC transient immunity | Rejects sub-10µs glitches up to 100mV below threshold, reducing false resets in electrically noisy systems |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 2.3V I/O supply rail in programmable logic controller CPU board during cold-cranking and load-dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 core upon rail collapse, holding reset for 1120ms post-recovery. Use Value: Prevents corrupted register writes and firmware lockup during 12V battery transients by enforcing minimum reset hold time aligned with power supply settling. |
Use Scenario: Embedded in door module ECU to supervise 2.3V microcontroller supply under ISO 16750-2 pulse 4 (load dump) stress. IC Role / Device Role / Timing Role: Open-drain RESET output tied to shared system reset bus; MR pin connected to service diagnostic port for technician-triggered reset. Use Value: Enables field-service recovery via momentary switch without modifying PCB layout or adding debounce circuitry. |
| Portable Medical Sensor Hub | Battery-Powered Smart Meter |
Use Scenario: Powers clinical-grade temperature/humidity sensor node operating from coin-cell battery with 1.8–2.5V discharge profile. IC Role / Device Role / Timing Role: Detects VCC drop below 2.31V threshold and asserts reset to prevent ADC data corruption during brownout. Use Value: Ultra-low 3μA quiescent current extends usable battery life by >18 months versus higher-current supervisors. |
Use Scenario: Supervises 2.3V real-time clock and metrology ASIC supply in AMI smart meter exposed to grid voltage sags. IC Role / Device Role / Timing Role: Provides 1120ms reset hold to ensure RTC registers reinitialize fully before timekeeping resumes. Use Value: Eliminates time drift errors caused by premature release of reset during marginal AC line recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR23D4+T | Same 2.31V threshold and 1120ms timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; requires external pullup not needed for open-drain | Select when board-level reset control suffices and MR functionality is unnecessary |
| TPS3808G33DBVR | 2.33V threshold, 1200ms timeout, 1.8–6V operation, but 12μA ICC at 3.3V and SOT-23-5 package | Higher supply current reduces battery life; extra pin adds routing complexity | Choose only if TI's qualification pedigree or wider voltage range outweighs power and size penalties |
Compared with MAX6326XR23D4+T, MAX6390XS23D4-T trades pin-compatible simplicity for essential MR functionality and lower quiescent current; versus TPS3808G33DBVR, it delivers 4× lower ICC and smaller SC70-4 footprint at the cost of slightly tighter voltage range and vendor-specific qualification.
Availability
MAX6390XS23D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensor hubs, and battery-powered smart meters requiring stable component supply with AEC-Q100-aligned reliability.
Supply support for MAX6390XS23D4-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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, precision voltage supervision in miniature packages, targeting space- and energy-constrained embedded systems where deterministic reset behavior is mission-critical.
FAQ
What is the exact reset threshold voltage of MAX6390XS23D4-T and how stable is it over temperature?
The MAX6390XS23D4-T has a factory-set nominal reset threshold of 2.31V, with guaranteed accuracy of ±2.5% across the full operating temperature range of –40°C to +125°C. This stability is achieved using laser-trimmed bandgap references and low-drift comparator design, ensuring consistent brownout detection in automotive and industrial environments without external calibration.
Does MAX6390XS23D4-T support manual reset, and what is the internal pullup value on the MR pin?
Yes, MAX6390XS23D4-T includes a dedicated MR (manual reset) input with an internal 1.56kΩ pullup resistor to VCC. This strong pullup ensures reliable logic-high bias and noise immunity, allowing direct connection to momentary switches or CMOS/TTL drivers without external components. The MR pin asserts reset when pulled low and holds reset for 140ms after release.
What are the reset timeout periods for MAX6390XS23D4-T, and why are they asymmetric?
MAX6390XS23D4-T provides two distinct timeout periods: 1120ms for VCC-initiated reset and 140ms for MR-initiated reset. This asymmetry ensures robust system recovery after power faults (long timeout) while enabling rapid, responsive user-triggered resets (short timeout), optimizing both reliability and usability in embedded applications.
Can MAX6390XS23D4-T operate reliably at very low supply voltages?
Yes, MAX6390XS23D4-T guarantees correct RESET output logic state down to VCC = 1.0V, and operates across a full range of +1.0V to +5.5V. Its internal circuitry remains functional during deep brownout, ensuring deterministic reset assertion even as the supply collapses - critical for preventing undefined microprocessor states in safety-critical systems.
What package type and footprint does MAX6390XS23D4-T use, and is it RoHS-compliant?
MAX6390XS23D4-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact, surface-mount package supports high-density PCB layouts in portable and automotive electronics without compromising thermal performance.
MAX6390XS23D4-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.31V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6390XS23D4-T FAQ
1.How can I place an order for MAX6390XS23D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS23D4-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 MAX6390XS23D4-T reliable?
The price and inventory of MAX6390XS23D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS23D4-T is usually 5 days.
3.What payment methods are accepted for MAX6390XS23D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS23D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS23D4-T?
MAX6390XS23D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS23D4-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 MAX6390XS23D4-T?
For technical support, including MAX6390XS23D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS23D4-T requirements.
6.How does Aetrix verify that MAX6390XS23D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6390XS23D4-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 MAX6390XS23D4-T meets industry standards.
7.What is the process for return or replacement of MAX6390XS23D4-T?
All MAX6390XS23D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS23D4-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 MAX6390XS23D4-T part is unused and in its original packaging.
Return procedure for MAX6390XS23D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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